CompTIA Troubleshooting Methodology

47 questions

All types47 Multiple choice24 Multiple select12 Ordering11

A network engineer is investigating intermittent packet loss and database session drops across a newly provisioned IPsec VPN tunnel between two enterprise data centers. After analyzing interface counters and running test ping sweeps with custom payload sizes, the engineer successfully proves that an MTU mismatch is causing packet fragmentation errors and confirms that lowering the tunnel interface MTU in a staging sandbox completely eliminates the drop count. According to the CompTIA troubleshooting methodology, which action should the engineer perform NEXT?

Formulate a formal plan of action to modify the production MTU settings while identifying any potential side effects or service disruptions.

Perform comprehensive end-to-end verification testing across all active database applications and host systems across the VPN tunnel.

Log the root cause analysis, change details, and resolution outcome into the enterprise knowledge base and ticketing system.

Re-interview network users and gather additional syslog data to determine whether physical layer cabling issues might also be contributing to the drops.

Show answer & explanation

Answer: Formulate a formal plan of action to modify the production MTU settings while identifying any potential side effects or service disruptions.

Answer

Formulate a formal plan of action to modify the production MTU settings while identifying any potential side effects or service disruptions.

The scenario indicates that Step 3 of the CompTIA troubleshooting methodology (Test the theory to determine cause) has just been successfully completed. According to the official methodology, the immediate next action is Step 4: Establish a plan of action to resolve the problem and identify potential effects, followed by implementing the solution. Planning out the deployment in production ensures changes do not cause unintended outages.

Step-by-Step Solution

Determine current step in the troubleshooting process.

The scenario describes a technician who tested a hypothesis in a lab setting and confirmed the root cause (MTU mismatch). This completes Step 3 (Test the theory to determine cause).

CompTIA methodology relies on a strict sequential workflow.

Identify the mandatory next step in the CompTIA 6-step process.

Step 4 is 'Establish a plan of action to resolve the problem and identify potential effects; implement the solution or escalate as necessary.'

Before making production changes, a technician must plan the deployment and evaluate potential downtime or collateral impact.

Evaluate the choices against Step 4.

The option advocating the formulation of a plan of action and assessment of side effects directly matches Step 4.

Other options jump ahead to Step 5 (verification), Step 6 (documentation), or regress to Step 1 (identification).

Key Concept

CompTIA Troubleshooting Methodology Step Sequence

Question 2Question →

A network technician receives a ticket stating that remote users at a new satellite office cannot reach the company's internal intranet application. The technician interviews affected users, duplicates the failure on a test host, and receives a 'Destination Host Unreachable' message. The technician then formulates a hypothesis that an incorrect VLAN tagging policy on the WAN router interface is stripping traffic. To verify this, the technician runs a packet capture on the router interface and confirms that frames are arriving with an unexpected VLAN ID tag, validating the root cause. According to the CompTIA troubleshooting methodology, which of the following steps should the technician execute NEXT?

Establish a plan of action to resolve the issue and identify potential effects.

Perform complete end-to-end connectivity tests across all satellite office workstations.

Update the network infrastructure ticketing system with the final root cause analysis and resolution steps.

Question the obvious by verifying physical Layer 1 cable continuity and link status indicators on the switch.

Show answer & explanation

Answer: Establish a plan of action to resolve the issue and identify potential effects.

Answer

Establish a plan of action to resolve the issue and identify potential effects.

The scenario describes a technician who has already identified the problem, established a theory of probable cause, and tested the theory to confirm the root cause via packet capture analysis. According to the CompTIA troubleshooting methodology, once the theory is confirmed, the immediate next step is to establish a plan of action to resolve the problem and identify potential effects.

Step-by-Step Solution

Identify the current phase completed in the scenario.

The technician interviewed users, reproduced the issue (Step 1: Identify the problem), established a hypothesis (Step 2: Establish a theory), and confirmed the root cause via packet capture (Step 3: Test the theory to determine cause).

Determining the completed step is necessary to find the next sequential phase in the CompTIA methodology.

Identify the mandatory next step in the CompTIA 6-step troubleshooting methodology.

Step 4 is 'Establish a plan of action to resolve the problem and identify potential effects'.

After a theory is proven true, a plan must be formulated before implementing fixes or verifying system functionality.

Key Concept

CompTIA Troubleshooting Methodology Steps

Question 3Question →

A network technician is investigating severe performance degradation across an enterprise network following an after-hours maintenance window. After reviewing syslog messages and analyzing traffic patterns, the technician suspects that an incorrectly configured Link Aggregation Control Protocol (LACP) bundle on a core switch stack is creating a Layer 2 switching loop. To test this theory, the technician temporarily disables one of the aggregated member interfaces, which instantly drops CPU utilization back to baseline levels and restores network throughput. According to the CompTIA troubleshooting methodology, which of the following actions should the technician perform next?

Develop a plan of action to resolve the misconfiguration while identifying potential impacts to the production environment.

Perform a full system verification test across all affected VLANs and enable Spanning Tree Protocol (STP) Guard features as a preventive measure.

Record the root cause, the temporary interface shutdown procedure, and the permanent resolution details in the central ticketing system.

Gather additional symptoms by interviewing affected department heads and conducting packet captures on edge switchports.

Show answer & explanation

Answer: Develop a plan of action to resolve the misconfiguration while identifying potential impacts to the production environment.

Answer

Develop a plan of action to resolve the misconfiguration while identifying potential impacts to the production environment.

The scenario describes a technician who has successfully tested a theory (Step 3) by temporarily disabling an aggregated link, which confirmed that an LACP misconfiguration was causing a Layer 2 loop. According to the CompTIA troubleshooting methodology, after confirming the theory, the technician must next establish a plan of action to resolve the problem and identify potential effects (Step 4).

Step-by-Step Solution

Analyze current progress within the CompTIA 6-step troubleshooting methodology.

The technician has already identified the problem (Step 1), established a theory of cause (Step 2), and tested the theory by disabling the link to confirm the switching loop (Step 3).

Determining the completed phase establishes the entry point for the next required phase.

Identify the official CompTIA step immediately following 'Test the theory to determine cause' (Step 3).

Step 4 is 'Establish a plan of action to resolve the problem and identify potential effects'.

Before executing permanent configuration changes in a production enterprise environment, the technician must plan the remediation and evaluate potential risks or downtime.

Match Step 4 requirements to the correct option.

Developing a plan of action while identifying potential impacts accurately reflects Step 4 of the methodology.

This maintains strict adherence to standard operational procedures and prevents unexpected side effects during resolution.

Key Concept

CompTIA 6-Step Troubleshooting Methodology Sequence

Estimated Time:2m 0s

Question 4Question →

A network technician has established a theory of probable cause regarding a workstation's loss of network connectivity. According to the CompTIA troubleshooting methodology, which of the following actions should the technician take NEXT?

Test the theory to determine the cause.

Establish a plan of action to resolve the problem.

Verify full system functionality and implement preventive measures.

Document findings, actions, and outcomes.

Show answer & explanation

Answer: Test the theory to determine the cause.

Answer

Test the theory to determine the cause.

According to CompTIA's official troubleshooting methodology, once a theory of probable cause has been established, the next logical step is to test the theory to determine the cause (or re-establish a new theory if the test fails).

Step-by-Step Solution

Identify the current step in the CompTIA troubleshooting sequence.

The technician is currently at Step 2: Establish a theory of probable cause.

The scenario explicitly states that a theory has just been established.

Determine the next sequential step in the official CompTIA methodology.

Step 3 is 'Test the theory to determine cause'.

Before forming a plan of action or attempting fixes, the technician must test the theory to confirm if it is correct or establish a new theory if disproven.

Key Concept

CompTIA Troubleshooting Methodology Step Order

Estimated Time:45s

Question 5Question →

A network technician receives a service desk ticket regarding a user who has lost network connectivity. The technician gathers information from the user and formulates a probable cause that a loose Ethernet cable at the wall jack is causing the outage. According to the official CompTIA troubleshooting methodology, which step should the technician perform NEXT?

Test the theory to determine the actual cause.

Establish a plan of action to resolve the problem.

Verify full system functionality and implement preventive measures.

Document the findings, actions, and outcomes.

Show answer & explanation

Answer: Test the theory to determine the actual cause.

Answer

Testing the theory to determine the actual cause is the next step required by the CompTIA troubleshooting methodology.

According to the standard CompTIA troubleshooting framework, after establishing a theory of probable cause, the technician must test the theory to confirm the cause (Step 3) before creating or implementing a plan of action.

Step-by-Step Solution

Identify the current phase of the troubleshooting process.

The technician has already identified the problem and established a theory of probable cause.

Recognizing the current progress in the official methodology dictates what action comes next.

Determine the immediate next step in the CompTIA 6-step framework.

Step 2 (Establish a theory of probable cause) is immediately followed by Step 3 (Test the theory to determine the cause).

A technician must confirm whether a hypothesized cause is correct before attempting resolution.

Key Concept

CompTIA Troubleshooting Methodology Step Sequence

Question 6Question →

A enterprise network administrator receives multiple urgent tickets reporting intermittent database connection timeouts immediately following an after-hours core switch firmware upgrade. Place the following troubleshooting steps in the exact chronological sequence mandated by the official CompTIA Network+ Troubleshooting Methodology, starting with the earliest step and ending with the final step.

Drag items to arrange them in the correct order

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Answer

The correct sequence follows the official 6-step CompTIA Troubleshooting Methodology: 1. Identify the problem (information gathering, symptoms, duplication), 2. Establish a theory of probable cause (question obvious, OSI model approach), 3. Test the theory to determine cause, 4. Establish a plan of action to resolve the problem and implement the solution, 5. Verify full system functionality and implement preventive measures, 6. Document findings, actions, and outcomes.

The CompTIA Troubleshooting Methodology defines a strict six-step linear order: Step 1 is identifying the problem (gathering information, interviewing users, checking logs, replicating symptoms); Step 2 is establishing a theory of probable cause; Step 3 is testing the theory to determine cause; Step 4 is establishing a plan of action and implementing the solution; Step 5 is verifying full system functionality and implementing preventive measures; Step 6 is documenting findings, actions, and outcomes.

Step-by-Step Solution

Identify the Problem

Information gathered from user interviews, switch logs, and symptom replication on a test client.

Before forming hypotheses or taking administrative action, the technician must clearly define the problem scope and reproduce symptoms.

Establish a Theory of Probable Cause

Formulate a hypothesis regarding trunk native VLAN reset during firmware update.

Technicians must evaluate possible causes using top-to-bottom or bottom-to-top OSI methods while questioning the obvious.

Test the Theory to Determine Cause

Packet capture confirms untagged frame drops caused by native VLAN mismatch.

The theory must be empirically tested before making infrastructure or configuration modifications.

Establish a Plan of Action and Implement Solution

Draft change request, evaluate risk, acquire approval, and apply configuration fix.

Changes must be planned to minimize secondary impacts before implementing the fix.

Verify Full System Functionality & Implement Preventive Measures

Execute query benchmarks across subnets and deploy compliance monitoring.

System-wide operation must be confirmed working post-fix, followed by proactive measures to avoid recurrence.

Document Findings, Actions, and Outcomes

Record event lifecycle details in ITSM platform and update knowledge repository.

Formal documentation ensures knowledge retention and provides reference data for future operational incidents.

Key Concept

CompTIA 6-Step Troubleshooting Methodology

Question 7Question →

After conducting diagnostic tests on a malfunctioning core switch, a systems engineer confirms their theory that a corrupted firmware image is causing routing table drops. Following the CompTIA troubleshooting methodology, which of the following actions should the engineer take next? (Select TWO.)

Select all that apply

Establish a plan of action to resolve the issue while identifying potential side effects.

Implement the resolution or escalate the issue as necessary to restore normal operation.

Verify full system functionality by conducting end-to-end connectivity tests across affected subnets.

Document the final findings, actions taken, and outcomes in the ticketing system.

Show answer & explanation

Answer: Establish a plan of action to resolve the issue while identifying potential side effects.; Implement the resolution or escalate the issue as necessary to restore normal operation.

Answer

The engineer should establish a plan of action while considering potential effects, and implement the solution or escalate as necessary.

Once a theory of probable cause has been tested and confirmed, the CompTIA troubleshooting methodology dictates moving to Step 4: Establish a plan of action to resolve the problem and implement the solution. This step encompasses formulating a detailed plan while considering potential effects and carrying out the necessary implementation or escalation.

Step-by-Step Solution

Identify the completed step in the CompTIA troubleshooting sequence.

The engineer has established and successfully tested/confirmed the theory of probable cause (Step 3 complete).

Identifying the current progress pinpoints where the technician stands in the methodology.

Identify the immediate next step in the methodology.

Step 4 requires establishing a plan of action to resolve the problem and implementing the solution.

CompTIA process rules mandate that planning resolution steps, identifying potential effects, and implementing the fix must occur before verification or documentation.

Select the correct actions corresponding to Step 4.

Developing a plan of action with side-effect consideration and executing/escalating the implementation represent the valid actions for this step.

Actions such as system verification (Step 5) and documentation (Step 6) cannot be performed out of sequence.

Key Concept

CompTIA troubleshooting methodology process sequence

Question 8Question →

A network technician is responding to an outage and needs to follow the standard CompTIA troubleshooting process. Place the following primary steps of the CompTIA Network+ troubleshooting methodology in the correct chronological order from first step to final step.

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Answer

The correct sequence of the CompTIA troubleshooting methodology is: 1. Identify the problem, 2. Establish a theory of probable cause, 3. Test the theory to determine the cause, 4. Establish a plan of action to resolve the problem and identify potential effects, 5. Verify full system functionality and implement preventive measures, and 6. Document findings, actions, and outcomes.

The CompTIA Network+ troubleshooting methodology follows a strict 6-step logical sequence: initial problem identification, forming a theory of cause, testing the theory, planning and implementing the fix, verifying overall system stability along with preventive steps, and ending with comprehensive documentation.

Step-by-Step Solution

Information Gathering & Symptom Identification

Identify the problem

Technicians must gather user input, duplicate the problem if possible, and establish the scope before forming hypotheses.

Hypothesis Formulation

Establish a theory of probable cause

After identifying symptoms, question the obvious and consider top-to-bottom/bottom-to-top OSI layer approaches.

Hypothesis Testing

Test the theory to determine the cause

Once a theory is formed, test it. If confirmed, proceed; if not, re-establish a new theory or escalate.

Action Planning

Establish a plan of action to resolve the problem and identify potential effects

Plan the repair steps, assess potential impacts on rest of network, and then implement the solution.

System Verification

Verify full system functionality and implement preventive measures

Confirm that the fix works without breaking other services and apply measures to prevent repeat issues.

Knowledge Base Update

Document findings, actions, and outcomes

The final step ensures proper administrative records, history tracking, and team knowledge sharing.

Key Concept

CompTIA 6-Step Troubleshooting Methodology Order

Question 9Question →

Following an overnight firmware upgrade on a multi-building enterprise network, users in one building report intermittent access to resources on other subnets. A network engineer systematically tests several hypotheses, eventually capturing traffic on the distribution switch and confirming that an unannounced native VLAN configuration change on a trunk link is causing tagged frame leaks and packet drops. Having successfully confirmed the root cause of the issue, which of the following actions should the engineer take next in accordance with the CompTIA troubleshooting methodology?

Establish a plan of action to rectify the native VLAN mismatch, considering potential impacts on connected segments, and implement the solution.

Conduct comprehensive functionality tests across all affected subnets and implement preventive port security policies.

Record the root cause, configuration changes, and resolution details in the ticketing system and configuration management database.

Re-interrogate affected users and review change management logs to establish alternative theories regarding the outage.

Show answer & explanation

Answer: Establish a plan of action to rectify the native VLAN mismatch, considering potential impacts on connected segments, and implement the solution.

Answer

Establish a plan of action to rectify the native VLAN mismatch, considering potential impacts on connected segments, and implement the solution.

According to the CompTIA 6-step troubleshooting methodology, the steps in order are: 1) Identify the problem, 2) Establish a theory of probable cause, 3) Test the theory to determine cause, 4) Establish a plan of action to resolve the problem and implement the solution, 5) Verify full system functionality and, if applicable, implement preventive measures, and 6) Document findings, actions, and outcomes. In the scenario, the technician has successfully tested and confirmed the theory (Step 3). The mandatory next phase is Step 4: establishing a plan of action to resolve the issue and implementing the solution.

Step-by-Step Solution

Identify the troubleshooting step completed within the scenario context

The engineer performed traffic captures and confirmed that an unannounced native VLAN configuration change was causing the packet drops, completing Step 3 (Test the theory to determine cause).

Determining the exact step completed allows identification of the next required step in the methodology.

Recall the official CompTIA 6-step troubleshooting methodology sequence

Sequence: 1. Identify the problem -> 2. Establish a theory of probable cause -> 3. Test the theory to determine cause -> 4. Establish a plan of action to resolve the problem and implement the solution -> 5. Verify full system functionality and implement preventive measures -> 6. Document findings, actions, and outcomes.

Adherence to CompTIA's official workflow order is strictly evaluated on Network+ exams.

Select the immediate next step in the sequence following Step 3

Step 4: Establish a plan of action to resolve the problem and implement the solution.

Once a theory is validated, the technician must design a resolution plan and execute it before verifying or documenting.

Key Concept

CompTIA 6-Step Troubleshooting Methodology Sequence

Question 10Question →

A network engineer is investigating intermittent packet loss and TCP session resets across a newly deployed hybrid cloud IPsec VPN tunnel connecting a corporate data center to an AWS VPC. After executing packet captures, the engineer confirms the hypothesis: transit packets exceeding the path MTU are being dropped because the DF (Don't Fragment) bit is set and ICMP Type 3 Code 4 messages are blocked by an upstream firewall. According to the CompTIA troubleshooting methodology, which TWO of the following actions should the engineer perform NEXT?

Select all that apply

Develop a structured implementation strategy to adjust MSS clamping and allow required ICMP control traffic.

Analyze the potential operational impacts and adverse effects of applying interface MTU modifications on active production sessions.

Update the centralized change management database and network repository with root-cause analysis findings.

Perform end-to-end ping sweeps with max-sized payloads to confirm full system functionality and stability.

Show answer & explanation

Answer: Develop a structured implementation strategy to adjust MSS clamping and allow required ICMP control traffic.; Analyze the potential operational impacts and adverse effects of applying interface MTU modifications on active production sessions.

Answer

The technician should develop a structured implementation strategy to adjust MSS clamping and analyze the potential operational impacts of the changes on production sessions.

In the CompTIA troubleshooting methodology, once a theory of probable cause has been tested and confirmed (Step 3), the network professional must proceed to Step 4: Establish a plan of action to resolve the problem and identify potential effects. Developing a structured implementation plan (adjusting MSS clamping and ICMP rules) and evaluating potential operational side effects on live production sessions are both essential components of this specific step.

Step-by-Step Solution

Determine current phase in CompTIA methodology

The engineer confirmed the theory through diagnostic testing (Step 3: Test the theory to determine cause).

Identifying the current position in the sequence determines which step comes next.

Identify the immediate next phase in the methodology

The next phase is Step 4: Establish a plan of action to resolve the problem and identify potential effects.

CompTIA guidelines dictate that once cause is proven, remediation planning and risk assessment must occur before implementation or verification.

Evaluate candidate actions against Step 4 requirements

Formulating the deployment plan (MSS clamping adjustments) and assessing potential operational impacts directly fulfill Step 4.

Planning actions without considering side effects or skipping to final verification/documentation violates official procedural order.

Key Concept

CompTIA Troubleshooting Methodology Step Progression (Test Theory → Plan of Action)

Question 11Question →

A network technician receives a service request reporting that a workstation in the accounting department cannot connect to the internal intranet server. The technician speaks with the affected user, reviews system logs, and successfully reproduces the connectivity failure. According to the CompTIA troubleshooting methodology, which of the following steps should the technician perform NEXT?

Establish a theory of probable cause.

Formulate a plan of action to resolve the connectivity issue.

Verify full system functionality by testing connection to the intranet server.

Document the findings, actions, and outcomes in the ticketing system.

Show answer & explanation

Answer: Establish a theory of probable cause.

Answer

Establish a theory of probable cause.

The technician has completed Step 1 (Identify the problem) by interviewing the user, analyzing logs, and duplicating the symptom. According to the CompTIA framework, the immediate next step is Step 2: Establish a theory of probable cause.

Step-by-Step Solution

Identify the current phase completed in the scenario.

The technician gathered information, reviewed system logs, and duplicated the issue, which completes Step 1 (Identify the problem).

Recognizing the completed step allows determination of the next sequential phase in the standard process.

Determine the next sequential phase in the CompTIA troubleshooting methodology.

Step 2 is to establish a theory of probable cause (questioning the obvious).

The CompTIA methodology follows a strict sequence: Identify problem -> Establish theory -> Test theory -> Plan of action/Implement -> Verify functionality -> Document.

Key Concept

CompTIA Troubleshooting Methodology Order

Question 12Question →

A network infrastructure team is addressing a critical issue where enterprise users experience session disconnections to cloud-hosted microservices whenever an SD-WAN edge appliance fails over to its secondary link. Place the following administrative actions in the correct sequence according to the official CompTIA troubleshooting methodology.

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Answer

The correct troubleshooting sequence strictly adheres to the 6-step CompTIA methodology: 1. Identify the problem (gather telemetry and user feedback) -> 2. Establish a theory of probable cause (hypothesize asymmetric routing) -> 3. Test the theory to determine cause (replicate failover and analyze packet traces) -> 4. Establish a plan of action and implement the solution (design and execute BGP local preference changes) -> 5. Verify full system functionality and implement preventive measures (test user traffic and configure automated alerts) -> 6. Document findings, actions, and outcomes (update the IT service desk knowledge repository).

The standard CompTIA Network+ troubleshooting methodology follows a strict 6-step sequence: (1) Identify the problem through telemetry and user inquiry, (2) Establish a theory of probable cause, (3) Test the theory to confirm the cause, (4) Formulate a plan of action and implement the resolution, (5) Verify full system functionality and apply preventive measures, and (6) Document findings, outcomes, and lessons learned.

Step-by-Step Solution

Identify the problem

Information is gathered from logs and user reports to define the scope of the SD-WAN failover issue.

Troubleshooting must begin with gathering facts and defining symptoms before making assumptions.

Establish a theory of probable cause

A hypothesis regarding asymmetric routing and stateful firewall drops is formulated.

Developing a logical cause based on gathered symptoms focuses diagnostic testing.

Test the theory to determine the cause

Staging lab tests and packet captures confirm that asymmetric routing is the true root cause.

The theory must be confirmed empirically before modifying live network configurations.

Establish a plan of action to resolve the problem and implement the solution

A change management plan for BGP routing adjustments is created, assessed for potential impact, and executed.

System changes require impact identification and structured execution to prevent unintended downtime.

Verify full system functionality and implement preventive measures

End-to-end microservice connectivity is confirmed during failover, and proactive alerts are configured.

Ensures the fix completely resolved the issue without secondary failures and guards against recurrence.

Document findings, actions, outcomes, and lessons learned

Root cause and resolution steps are recorded in the service desk knowledge base.

Complete documentation provides historical references and aids future incident resolution.

Key Concept

CompTIA 6-Step Network Troubleshooting Methodology

Question 13Question →

A network architect is troubleshooting an issue where large database backups across a hybrid cloud IPsec tunnel intermittently drop during peak hours. The architect gathered system logs, verified that small control packets traverse the tunnel cleanly, and hypothesized that Path MTU Discovery (PMTUD) blackholing was occurring because ICMP Type 3 Code 4 (Fragmentation Needed) packets were being dropped by a perimeter security policy. In a staging environment, the architect configured an explicit ICMP inspection rule and successfully validated that $1500$ -byte test frames were correctly fragmented and transmitted without session drops, thereby confirming the root cause. According to the CompTIA Troubleshooting Methodology, which of the following actions should the architect take NEXT?

Establish a plan of action to deploy the ICMP policy change to production, including risk analysis and a rollback procedure.

Apply the modified ICMP firewall rules directly to the production gateway and test for packet drops during the next scheduled backup cycle.

Perform a full system verification by monitoring database synchronization metrics and backup job completion status across all remote cloud nodes.

Document the ICMP packet size mismatch findings, root cause analysis, and staging test results in the incident management database.

Show answer & explanation

Answer: Establish a plan of action to deploy the ICMP policy change to production, including risk analysis and a rollback procedure.

Answer

Establish a plan of action to deploy the ICMP policy change to production, including risk analysis and a rollback procedure.

The scenario describes a technician who has already identified the issue (Step 1), established a theory regarding ICMP blocking (Step 2), and successfully tested the theory in a staging environment to confirm the root cause (Step 3). According to the official CompTIA Troubleshooting Methodology, the next required step is Step 4: 'Establish a plan of action to resolve the problem and implement the solution.' This step includes assessing potential impacts, creating rollback strategies, and securing proper change management approval prior to deploying changes in production.

Step-by-Step Solution

Analyze the completed methodology steps in the scenario.

Identified that Step 1 (Identify the problem), Step 2 (Establish a theory of probable cause), and Step 3 (Test the theory to determine cause) have all been completed.

Testing the theory in a staging environment and confirming that the ICMP inspection rule resolved

1500

-byte frame drops signifies the completion of Step 3.

Determine the next sequential phase of the CompTIA 6-step troubleshooting methodology.

The immediate next step is Step 4: Establish a plan of action to resolve the problem and implement the solution.

Before making changes to production infrastructure, a structured plan of action considering potential side effects and rollback steps must be established.

Evaluate the response options against Step 4 requirements.

Drafting the deployment plan, performing risk analysis, and defining a rollback procedure aligns directly with Step 4.

Direct implementation without a plan skips necessary risk management, whereas verification and documentation occur later in the troubleshooting process.

Key Concept

CompTIA Troubleshooting Methodology Step Sequence

Question 14Question →

A network administrator is investigating authentication failures on an enterprise SOHO branch network following a RADIUS server migration. The administrator gathered user symptoms, reviewed radius log files, established a hypothesis regarding a mismatched shared secret on the wireless access points, and successfully confirmed this cause by conducting a test authentication using the updated secret in a controlled lab segment. According to the CompTIA troubleshooting methodology, which step should the administrator take NEXT?

Develop a plan of action to update the shared secrets on production access points while identifying potential operational impacts.

Perform test authentications across all client devices to confirm that full wireless functionality is completely restored.

Log the root cause, change details, and resolution summary into the organization's centralized ticketing system.

Conduct user interviews and check recent network infrastructure change logs to gather additional problem symptoms.

Show answer & explanation

Answer: Develop a plan of action to update the shared secrets on production access points while identifying potential operational impacts.

Answer

The administrator should establish a plan of action to resolve the problem and identify potential effects prior to implementing the fix on production equipment.

According to the CompTIA troubleshooting methodology, the steps occur in the following order: (1) Identify the problem, (2) Establish a theory of probable cause, (3) Test the theory to determine cause, (4) Establish a plan of action to resolve the problem and identify potential effects / implement solution, (5) Verify full system functionality and implement preventive measures, and (6) Document findings, actions, and outcomes. Because the administrator has just tested and confirmed the theory (Step 3), the immediate next step is Step 4: establishing a plan of action and identifying potential operational effects before implementation.

Step-by-Step Solution

Analyze current phase in CompTIA methodology

The technician has gathered symptoms (Step 1), formed a hypothesis (Step 2), and tested/confirmed the hypothesis in a lab (Step 3).

Determining the completed step is essential to identifying the required next step in the 6-step methodology.

Identify the next sequential step in the methodology

Step 4 is 'Establish a plan of action to resolve the problem and identify potential effects' followed by implementing the solution.

CompTIA requires planning changes and assessing potential risks/effects before applying changes to production networks.

Key Concept

CompTIA 6-Step Troubleshooting Methodology Sequence

Estimated Time:1m 30s

Question 15Question →

A network technician needs to troubleshoot a reported network outage by following standard industry methodology. Place the given CompTIA troubleshooting methodology steps in the correct sequential order from first step to last step.

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Answer

The correct sequential order is: 1) Identify the problem, 2) Establish a theory of probable cause, 3) Test the theory to determine cause, 4) Establish a plan of action and implement the solution, and 5) Verify full system functionality and implement preventive measures.

The official CompTIA 6-step troubleshooting methodology follows a strict sequence: 1. Identify the problem, 2. Establish a theory of probable cause, 3. Test the theory to determine cause, 4. Establish a plan of action to resolve the problem and implement the solution, 5. Verify full system functionality and implement preventive measures, and 6. Document findings, actions, and outcomes.

Step-by-Step Solution

Begin with problem identification

Information, symptom reports, and recent changes are gathered.

You must understand what is failing before forming hypotheses.

Formulate a probable cause theory

A prioritized hypothesis of the failure point is established.

Hypothesizing narrows down the operational scope before testing.

Test the theory

The root cause is verified (or disproved, triggering a new theory).

Changes should not be implemented without confirming the cause.

Plan and execute the solution

A plan of action is established and the fix is deployed.

Structured execution minimizes unwanted side effects during remediation.

Verify functionality and prevent recurrence

System operation is validated and preventive controls are applied.

Verification ensures the problem is fully resolved and won't immediately reoccur.

Key Concept

CompTIA Troubleshooting Methodology Order

Question 16Question →

A network engineer troubleshooting a loss of network redundancy on a core switch stack has confirmed that a mismatched VTP domain configuration was the root cause by successfully validating the hypothesis in a staging lab. Following the CompTIA troubleshooting methodology, the engineer is now advancing to the immediate NEXT phase before implementing any modifications on the production network. Which of the following actions should the engineer perform during this phase? (Select TWO.)

Select all that apply

Outline a step-by-step implementation plan detailing the exact configuration commands needed to align the VTP domain settings.

Evaluate the risk of potential service disruption to downstream trunk links and identify necessary change control approvals.

Update the enterprise network documentation and record the resolution details in the ticketing system.

Execute a full ping sweep across all VLANs and verify that redundant links have transitioned to a forwarding state.

Show answer & explanation

Answer: Outline a step-by-step implementation plan detailing the exact configuration commands needed to align the VTP domain settings.; Evaluate the risk of potential service disruption to downstream trunk links and identify necessary change control approvals.

Answer

The engineer must outline a step-by-step implementation plan detailing the configuration changes and evaluate the risk of potential service disruption while identifying change control approvals.

According to the CompTIA troubleshooting methodology, after testing a theory and confirming the root cause (Step 3), the technician must proceed to Step 4: 'Establish a plan of action to resolve the problem and identify potential effects'. Developing a clear step-by-step implementation plan and identifying potential risks or side effects on production traffic directly satisfy the requirements of Step 4.

Step-by-Step Solution

Identify the current phase completed in the CompTIA troubleshooting methodology.

The engineer confirmed the root cause in a lab, which completes Step 3: 'Test the theory to determine cause'.

Determining which phase was completed establishes where the technician is in the overall sequence.

Determine the immediate next sequential step in the methodology.

The next phase is Step 4: 'Establish a plan of action to resolve the problem and identify potential effects'.

CompTIA requires establishing a formal plan and assessing side effects prior to implementing any production changes.

Select the activities that correspond strictly to Step 4.

Formulating a step-by-step implementation plan and evaluating side effects / change control requirements belong to Step 4.

Implementation tasks, verification, and final documentation belong to subsequent steps in the methodology.

Key Concept

CompTIA 7-Step Troubleshooting Methodology Sequence

Question 17Question →

A network engineer is responding to reports of intermittent application session resets occurring across a hybrid cloud IPsec tunnel following a recent router firmware patch. Place the technician's troubleshooting procedures in the precise order required by the official CompTIA troubleshooting methodology, from the initial action to the final action.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequential order of the troubleshooting process is: 1. Review logs, interview users, and duplicate the failure; 2. Formulate a hypothesis regarding DF bit enforcement and MTU mismatch; 3. Perform ping tests with the DF bit set to test the hypothesis; 4. Submit change management details, identify potential impacts, and apply MSS clamping; 5. Verify transaction stability under full system load and configure monitoring thresholds; 6. Log findings, parameters, and documentation in the ticketing system repository.

The correct sequence strictly adheres to the official CompTIA 6-step troubleshooting workflow: (1) Identify the problem by gathering symptoms and duplicating the issue; (2) Establish a theory of probable cause by analyzing header overhead and packet constraints; (3) Test the theory using DF bit ping sweeps; (4) Formulate a change management plan of action, evaluate side effects, and implement MSS clamping; (5) Verify full functionality under real workloads and apply preventive monitoring; (6) Document the root cause and configuration details in the enterprise repository.

Step-by-Step Solution

Identify the problem by interviewing users, reviewing error logs, and replicating the issue.

Establishes clear symptoms, baseline conditions, and scope of the failure.

CompTIA methodology strictly mandates gathering information and establishing symptoms before making assumptions or forming hypotheses.

Establish a theory of probable cause by evaluating physical, transport, and network layer parameters.

Develops a plausible hypothesis (MTU/DF bit mismatch across IPsec tunnel).

A theory must be established before conducting targeted diagnostic tests.

Test the theory using diagnostic utilities (ping with DF bit set).

Confirms or denies the root cause of the problem.

Testing validates the theory without prematurely implementing untested production modifications.

Establish a plan of action to resolve the issue, evaluate potential side effects, and implement the solution.

Applies the resolution (MSS clamping configuration) safely through change control procedures.

Remediation planning and impact analysis must precede implementation to prevent unintended outages.

Verify full system functionality and implement preventive measures.

Ensures the system operates correctly end-to-end and guards against future recurrence.

Confirmation of overall system health must occur before final sign-off and ticket closure.

Document findings, actions, and outcomes.

Updates organizational knowledge bases and incident history records.

Documentation provides reference material for future network incidents and completes the methodology.

Key Concept

CompTIA 6-Step Network Troubleshooting Methodology Sequential Flow

Question 18Question →

A network technician is troubleshooting a workstation that lost connectivity to the local intranet. The technician established a hypothesis that a recently disabled network port was the cause and conducted tests that confirmed this theory. According to the CompTIA troubleshooting methodology, which of the following actions should the technician take NEXT?

Establish a plan of action to resolve the problem and identify potential effects.

Document the findings, root cause analysis, and final solution in the ticketing system.

Verify full system functionality by performing end-to-end testing on the workstation.

Re-evaluate the problem and establish a new theory of probable cause.

Show answer & explanation

Answer: Establish a plan of action to resolve the problem and identify potential effects.

Answer

Establish a plan of action to resolve the problem and identify potential effects.

According to the CompTIA 7-step troubleshooting methodology, once a theory of probable cause has been tested and confirmed (Step 3), the technician must establish a plan of action to resolve the issue and identify any potential effects (Step 4) before implementing the fix.

Step-by-Step Solution

Determine the current phase in the CompTIA Troubleshooting Methodology.

The technician has completed Step 2 (Establish a theory) and Step 3 (Test the theory to determine cause).

The scenario states that testing confirmed the established theory.

Identify the immediate next step in the official 7-step sequence.

Step 4 is 'Establish a plan of action to resolve the problem and identify potential effects'.

After confirming the cause, the technician must plan the fix and consider any potential impacts before executing the resolution.

Key Concept

CompTIA Troubleshooting Methodology Order

Question 19Question →

During a data center upgrade, a network engineer is investigating why a newly provisioned storage switch fails to synchronize fabric configuration files with the primary core switch. The engineer performed diagnostic packet captures and verified that the underlying cause is an MTU mismatch across the interconnecting trunk link, which causes jumbo frames to be dropped. According to the CompTIA troubleshooting methodology, which of the following actions should the network engineer perform NEXT?

Develop a plan of action to adjust the trunk interface MTU settings and evaluate the change's potential impact on active fabric traffic.

Reconfigure the switch interface MTU value to 9000 bytes across the interconnecting link immediately.

Execute a test file transfer between storage nodes to confirm that fabric synchronization operates properly.

Log the MTU mismatch root cause, actions taken, and configuration outcome in the change management ticketing database.

Show answer & explanation

Answer: Develop a plan of action to adjust the trunk interface MTU settings and evaluate the change's potential impact on active fabric traffic.

Answer

Develop a plan of action to adjust the trunk interface MTU settings and evaluate the change's potential impact on active fabric traffic.

The scenario states that the engineer has already tested and confirmed the root cause (an MTU mismatch dropping jumbo frames), completing Step 3 (Test the theory to determine cause). According to the CompTIA troubleshooting methodology, the immediate next step is Step 4: Establish a plan of action to resolve the problem and identify potential effects. Developing a plan to adjust MTU while assessing risks to active fabric traffic strictly fulfills this phase.

Step-by-Step Solution

Identify the completed methodology phase from the scenario context.

The engineer performed packet captures and confirmed the MTU mismatch as the root cause, indicating that Step 3 (Test the theory to determine cause) is complete.

CompTIA troubleshooting requires determining the current phase before identifying the immediate next step.

Determine the next sequential phase in the CompTIA 7-step model.

Following Step 3 (Test theory), the technician must perform Step 4: Establish a plan of action to resolve the problem and identify potential effects.

Planning and risk assessment must precede actual implementation to avoid creating secondary network outages.

Select the option matching Step 4 requirements.

Developing a plan of action to adjust MTU while evaluating potential impacts on active fabric traffic directly matches Step 4.

This option explicitly fulfills both key components of Step 4: action planning and impact assessment.

Key Concept

CompTIA Troubleshooting Methodology Step Order (Testing Theory -> Plan of Action & Identifying Potential Effects)

Question 20Question →

A network administrator has confirmed through testing that an exhausted DHCP IP address scope was the root cause of network connectivity failures affecting wireless inventory scanners in a warehouse. According to the CompTIA troubleshooting methodology, which of the following actions should the administrator perform NEXT? (Select TWO.)

Select all that apply

Establish a plan of action to expand the available IP address pool on the DHCP server.

Assess potential impacts and side effects on other subnets before applying the scope changes.

Conduct a baseline analysis of signal strength to determine if wireless RF interference is present.

Log the solution details and close out the formal incident ticket in the management system.

Show answer & explanation

Answer: Establish a plan of action to expand the available IP address pool on the DHCP server.; Assess potential impacts and side effects on other subnets before applying the scope changes.

Answer

The administrator should establish a plan of action to expand the DHCP pool scope and evaluate the potential effects of the change prior to implementation.

After confirming the root cause during testing (Step 3), the technician must proceed to Step 4 of the CompTIA troubleshooting methodology: Establish a plan of action to resolve the problem and identify potential effects. Formulating the configuration strategy and evaluating potential adverse side effects on other network segments directly fulfill this step.

Step-by-Step Solution

Identify the currently completed step in the troubleshooting scenario.

The administrator has completed Step 3 (Test the theory to determine cause) by confirming that an exhausted DHCP scope caused the failure.

Determining the completed step identifies where the administrator currently resides within the methodology sequence.

Determine the immediate next phase defined by the CompTIA troubleshooting methodology.

Step 4 is 'Establish a plan of action to resolve the problem and identify potential effects.'

The CompTIA methodology dictates formulating a resolution plan and identifying potential impacts prior to implementing any changes.

Select the specific actions that belong to Step 4.

Creating a plan to adjust the DHCP pool and identifying potential effects on connected subnets.

Both actions directly align with establishing a plan of action and considering potential consequences.

Key Concept

CompTIA Troubleshooting Methodology Step 4: Establish a Plan of Action and Identify Potential Effects

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