Tüm alıştırma soruları

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A IT support technician is troubleshooting a user's workstation where opening any website in the primary web browser results in immediate redirection to an ad-heavy third-party search engine. During initial investigation, the technician finds an unrecognized browser extension running and discovers that the system's local network settings have been changed to direct HTTP traffic through a suspicious external port. Which of the following actions should the technician perform to resolve the browser redirection and restore proper internet routing? (Select TWO.)

Geçerli olan tümünü seçin

Uninstall the unrecognized browser extension and restore the browser settings to default values.

Clear the web browser temporary cache, cookies, and browsing history.

Disable the unauthorized proxy server settings in the operating system's network configuration.

Open Credential Manager and clear all stored web credentials and tokens.

Cevabı ve açıklamayı göster

Cevap: Uninstall the unrecognized browser extension and restore the browser settings to default values.; Disable the unauthorized proxy server settings in the operating system's network configuration.

Cevap

The correct actions are to uninstall the unrecognized browser extension while resetting browser defaults, and to disable the unauthorized proxy server settings in the operating system's network configuration.

Uninstalling the unrecognized extension removes the rogue browser component causing the redirection, while resetting browser defaults cleans up modified homepages and search configurations. Disabling the unauthorized proxy server in network settings restores standard web traffic routing.

Adım Adım Çözüm

Remove malicious browser add-ons and reset configuration.

Eliminates the rogue extension managing browser redirection and restores default search engine and homepage parameters.

Rogue extensions are common persistence vectors for browser hijackers.

Inspect and reconfigure system LAN proxy settings.

Ensures internet requests bypass the unauthorized proxy server.

Browser hijackers often alter system-wide proxy settings to re-route all outbound web traffic through malicious servers.

Anahtar Kavram

Browser Hijack & Proxy Remediation

Soru 142Soru →

A network administrator is provisioning a hypervisor host server equipped with $128\text{ GB}$ of physical RAM. The host hypervisor requires $16\text{ GB}$ of RAM reserved strictly for host system operations and management overhead. If each guest virtual machine requires $12\text{ GB}$ of dedicated RAM, what is the maximum number of guest virtual machines that can run concurrently on this host without exceeding physical memory capacity?

Cevabı ve açıklamayı göster

Cevap: 9

Cevap

To find the maximum number of concurrent guest virtual machines supported without memory overcommitment, first subtract the

16\text{ GB}

reserved hypervisor overhead from the total

128\text{ GB}

physical RAM, leaving

112\text{ GB}

. Dividing

112\text{ GB}

by the

12\text{ GB}

required per VM yields approximately

9.33

. Since partial virtual machines cannot be instantiated, the host supports a maximum of 9 fully provisioned VMs.

Adım Adım Çözüm

Calculate RAM available for virtual machines

128\text{ GB} - 16\text{ GB} = 112\text{ GB}

Deduct reserved hypervisor overhead from total physical RAM to ensure host operating system stability.

Calculate guest VM capacity

112\text{ GB} / 12\text{ GB} = 9.333...

virtual machines

Determine how many

12\text{ GB}

allocations fit into the remaining RAM pool.

Determine maximum concurrent VMs

9 virtual machines

Take the floor of the result because only complete virtual machines with full RAM allocations can run.

Anahtar Kavram

Virtual Machine RAM Capacity Planning and Hypervisor Overhead

Tahmini Süre:1m 30s

Soru 143Soru →

A technician resolves a browser hijacking issue on a user's computer by clearing browser settings, resetting the default search engine, and removing unauthorized extensions. However, as soon as the user restarts the computer and launches the web browser, the search engine and homepage immediately revert back to the malicious redirection site. Which of the following is the MOST likely cause of the persistent browser modification?

A malicious background process or scheduled task is restoring the unauthorized settings upon reboot.

The web browser's temporary internet files and cached cookies were not cleared prior to performing the browser reset.

Stale authentication entries stored within Windows Credential Manager are redirecting web traffic.

The workstation is currently being targeted by a social engineering spear phishing campaign.

Cevabı ve açıklamayı göster

Cevap: A malicious background process or scheduled task is restoring the unauthorized settings upon reboot.

Cevap

A malicious background process or scheduled task is restoring the unauthorized settings upon reboot.

The correct answer highlights that a background startup mechanism, such as a scheduled task or persistent process, is actively restoring the malicious browser configuration upon reboot. When manual browser resets fail to persist across system reboots, technicians must investigate auto-start locations and active background processes to eliminate the root malware component.

Adım Adım Çözüm

Analyze the symptoms

The technician successfully reset the browser settings, but the malicious redirection returned immediately after system reboot.

When browser settings revert automatically across system reboots despite manual remediation, a persistent mechanism outside the browser is actively restoring the changes.

Identify the persistence mechanism

Recognize that malware frequently installs startup items, services, or scheduled tasks to maintain persistence on the host operating system.

Standard browser cleanup steps will be continuously overridden until the underlying startup mechanism or malicious executable is removed.

Anahtar Kavram

Browser Hijacker Persistence & Remediation

Soru 144Soru →

A systems administrator is responding to an alert on a standalone Windows point-of-sale terminal that is exhibiting unauthorized background network connections and altered registry run keys. The administrator has verified the malware infection and immediately unplugged the network cable to isolate the workstation. According to CompTIA's standard 7-step malware removal procedures, which of the following actions should the administrator perform NEXT?

Disable System Restore and delete all existing restore points on the infected workstation.

Update the local anti-malware signature file via external storage and execute a comprehensive remediation scan.

Reconnect the endpoint to an isolated management VLAN to enable remote anti-malware updates and centralized monitoring.

Open Event Viewer to review the Security log for unauthorized authentication attempts and document the incident.

Cevabı ve açıklamayı göster

Cevap: Disable System Restore and delete all existing restore points on the infected workstation.

Cevap

Disable System Restore and delete all existing restore points on the infected workstation.

The official CompTIA 7-step malware removal process follows this exact order: 1. Identify malware symptoms, 2. Isolate infected systems, 3. Disable System Restore (in Windows), 4. Remediate infected systems (update anti-malware / scan and remove), 5. Schedule scans and run updates, 6. Enable System Restore and create a restore point, 7. Educate the end user. Since the scenario explicitly confirms that identification and isolation have taken place, the administrator must immediately disable System Restore to purge infected restore points.

Adım Adım Çözüm

Review the scenario to identify the current step reached in the CompTIA 7-step malware removal process.

Malware symptoms have been identified (Step 1) and the workstation has been isolated from the network (Step 2).

The scenario explicitly establishes that identification and isolation are complete.

Determine the mandatory next step in the standard 7-step malware removal workflow.

Step 3 requires disabling System Restore (System Protection in Windows).

Disabling System Restore prevents infected system files stored within restore points/Volume Shadow Copies from being used to restore the machine or reinfecting it later.

Select the option that strictly corresponds to Step 3 of the CompTIA methodology.

Disabling System Restore and deleting existing restore points is the correct next action.

Remediation (scans/updates), scheduling, re-enabling System Restore, and end-user education must strictly follow in subsequent steps.

Anahtar Kavram

CompTIA 7-Step Malware Removal Procedure Sequence

Soru 145Soru →

An IT technician on an offshore logistics terminal is servicing a dedicated cargo-manifest workstation that is infected with persistent ransomware and trojan spyware. The technician has already identified the symptoms and isolated the infected machine from the local area network and wireless access points. According to the CompTIA 7-step malware removal process, which of the following actions must the technician perform NEXT before running a full system scan to remediate the infected endpoint? (Select TWO.)

Geçerli olan tümünü seçin

Disable System Restore (or System Protection) in the Windows operating system.

Update the local anti-malware definition database using an offline update package on a verified USB drive.

Create an immediate Windows System Restore point to safeguard current configuration settings.

Conduct an immediate security awareness training session with the workstation operator.

Cevabı ve açıklamayı göster

Cevap: Disable System Restore (or System Protection) in the Windows operating system.; Update the local anti-malware definition database using an offline update package on a verified USB drive.

Cevap

The correct actions are disabling System Restore to prevent malware persistence in backups and updating the anti-malware signature definitions via offline media before initiating the scan.

Following system isolation (Step 2), the CompTIA malware removal framework requires disabling System Restore (Step 3) to purge corrupted restore points, followed by updating anti-malware signatures and scanning the environment (Step 4). Because network connectivity is severed during isolation, anti-malware engine definitions must be updated locally using removable media.

Adım Adım Çözüm

Review the current phase within the CompTIA 7-step malware removal process.

Step 1 (Identify symptoms) and Step 2 (Isolate system) are already complete.

The scenario states the technician has identified the infection and disconnected all network connections.

Execute Step 3 of the process: Disable System Restore.

System Restore is turned off, clearing unverified restore points that may contain malicious payloads.

Malware frequently hides in restore points or relies on system restore to reinstate itself after deletion.

Execute Step 4a of the process: Update anti-malware signatures.

Anti-malware definitions are updated manually using removable offline media.

Because the endpoint remains isolated from the network, online updates are impossible; definitions must be updated manually prior to scanning.

Anahtar Kavram

CompTIA 7-Step Malware Removal Procedure

Soru 146Soru →

A corporate workstation running Windows 11 experiences malicious web search redirects and untrusted SSL certificate warnings across all installed web browsers (Google Chrome, Microsoft Edge, and Mozilla Firefox). A technician notices that all HTTP and HTTPS traffic is being routed through an unfamiliar local IP address on port 8080 regardless of which browser is opened. Which of the following actions should the technician perform FIRST to stop the system-wide traffic redirection?

Disable and remove unknown browser extensions from each individual browser.

Inspect and reset the system proxy server settings in Windows Network & Internet settings.

Open Credential Manager in Control Panel and delete stored web credentials.

Reconfigure the default gateway IP address in the local router interface.

Cevabı ve açıklamayı göster

Cevap: Inspect and reset the system proxy server settings in Windows Network & Internet settings.

Cevap

Inspect and reset the system proxy server settings in Windows Network & Internet settings.

The correct answer is to inspect and reset the system proxy server settings in Windows Network & Internet settings. Windows utilizes central WinINet proxy settings that apply across multiple browsers (including Chrome, Edge, and Firefox). When malware configures a unauthorized manual proxy or automatic proxy script, all outbound browser connections are redirected through a rogue intermediary server, producing certificate errors and search redirects across all browsers simultaneously.

Adım Adım Çözüm

Analyze the symptoms

The issue affects all installed browsers on the OS simultaneously and routes traffic through a specific local IP/port combination, pointing to a central system-level setting rather than individual browser add-ons.

Windows applications (including Chrome, Edge, and Firefox by default) rely on the operating system's system-wide proxy configurations (WinINet settings).

Identify the remediation entry point

Navigate to Settings > Network & Internet > Proxy (or Internet Options > Connections > LAN Settings).

This area controls whether automatic proxy setup scripts (PAC files) or manual proxy servers are enabled globally for client network applications.

Disable unauthorized proxy parameters

System traffic immediately resumes direct connection paths to standard network gateways, clearing certificate warnings caused by rogue proxy interception.

Removing the proxy server entry breaks the redirection vector used by the adware/malware.

Anahtar Kavram

System-Wide Web Proxy Configuration and Browser Security Remediation

Soru 147Soru →

A systems administrator at an automated distribution facility notices that a Windows-based picking console is periodically dropping local service responses, running unprompted background tasks, and generating unauthorized outbound connections. The administrator confirms a malware infection and immediately quarantines the console by disconnecting its Ethernet cable and turning off all wireless radios. According to CompTIA's standard 7-step malware removal procedures, which of the following actions should the administrator perform NEXT?

Disable System Restore in Windows.

Boot the computer into Safe Mode and run a full anti-malware scan using pre-downloaded signature updates.

Temporarily re-enable the network interface to download updated malware signature files from an internal repository server.

Create an immediate restore point to save the current configuration in case remediation damages system files.

Cevabı ve açıklamayı göster

Cevap: Disable System Restore in Windows.

Cevap

The administrator should disable System Restore in Windows before attempting remediation.

CompTIA's official 7-step malware remediation process specifies the following sequence: 1. Identify malware symptoms, 2. Isolate infected systems, 3. Disable System Restore (in Windows), 4. Remediate infected systems (update anti-malware software / scan and use removal techniques), 5. Schedule scans and run updates, 6. Enable System Restore and create a restore point, 7. Educate the end user. Because the technician has already identified the symptoms and isolated the system, the mandatory next step is disabling System Restore.

Adım Adım Çözüm

Analyze the current state within the 7-step malware removal process.

Step 1 (Identify symptoms) and Step 2 (Isolate the infected system) have already been completed.

The scenario explicitly notes confirmed symptoms and the active physical/wireless network isolation of the machine.

Determine the required 3rd step in CompTIA's standard malware removal methodology.

Step 3 dictates disabling System Restore (in Windows).

Disabling System Restore purges pre-existing restore points where malware components might reside and prevents clean snapshots from being polluted.

Evaluate subsequent steps (Step 4 Remediate, Step 5 Schedule scans, Step 6 Enable System Restore, Step 7 Educate user).

Remediation scanning and signature updates take place in Step 4, after System Restore is disabled.

Following the strict sequence prevents re-infection during or after cleanup.

Anahtar Kavram

CompTIA 7-Step Malware Remediation Best Practices

Soru 148Soru →

A field service technician at a regional weather forecasting station is troubleshooting a Windows 11 workstation used for real-time radar telemetry processing. The workstation exhibits symptoms of a malware infection, including persistent rogue system pop-up warnings, redirected search engine results, and heavy unauthorized background network traffic. Which TWO of the following initial actions should the technician perform to contain the threat and prepare the workstation prior to running malware remediation scans?

Geçerli olan tümünü seçin

Disconnect all physical Ethernet cables and disable all wireless network adapters on the workstation.

Disable the Windows System Restore feature on all local disk volumes.

Roll back the operating system to an earlier restore point using Windows System Restore.

Replace the system's network interface card assuming high bandwidth usage indicates a hardware controller failure.

Cevabı ve açıklamayı göster

Cevap: Disconnect all physical Ethernet cables and disable all wireless network adapters on the workstation.; Disable the Windows System Restore feature on all local disk volumes.

Cevap

The technician should disconnect all physical network connections and wireless adapters to quarantine the host, and disable Windows System Restore to prevent malware from persisting in Volume Shadow Copies.

According to CompTIA's standard 7-step malware remediation process, once symptoms are identified (Step 1), the immediate next steps are to quarantine the infected system (Step 2) and disable System Restore (Step 3). Disconnecting network interfaces prevents malware from spreading across the local subnet or communicating with external threat actors. Disabling System Restore deletes existing shadow copies, ensuring malware cannot persist inside restore points during remediation.

Adım Adım Çözüm

Identify symptoms of infection

Malware activity confirmed (pop-ups, browser redirects, unauthorized background network traffic).

Establishes that the machine has been compromised and requires full standard 7-step remediation.

Quarantine the infected system (Step 2 of CompTIA 7-step process)

Host isolated from LAN and WAN by unplugging Ethernet cables and disabling Wi-Fi/Bluetooth adapters.

Prevents lateral movement across the network and halts active data exfiltration or C2 traffic.

Disable System Restore (Step 3 of CompTIA 7-step process)

System restore points cleared and shadow copies disabled.

Ensures clean removal so infected files cannot be backed up into shadow copies or restored accidentally later.

Anahtar Kavram

CompTIA 7-Step Malware Removal Procedure (Quarantine and System Restore Management)

Tahmini Süre:1m 30s

Soru 149Soru →

A network technician runs the command 'ipconfig /all' on a newly deployed workstation and receives an IPv4 address of 169.254.112.45 with a subnet mask of 255.255.0.0. Which of the following statements correctly describe the network status and capabilities of this workstation? (Select TWO.)

Geçerli olan tümünü seçin

The workstation automatically assigned itself an APIPA address because it could not reach a functional DHCP server.

The workstation can still communicate with other systems on the same local subnet that are using APIPA addresses.

The workstation can successfully navigate the internet and access remote cloud resources using its assigned default gateway.

The local DNS server dynamically leased this IP address to the workstation upon network initialization.

Cevabı ve açıklamayı göster

Cevap: The workstation automatically assigned itself an APIPA address because it could not reach a functional DHCP server.; The workstation can still communicate with other systems on the same local subnet that are using APIPA addresses.

Cevap

The workstation automatically generated an APIPA address after failing to receive a lease from a DHCP server, which allows for local subnet communications with other APIPA-configured hosts but does not provide default gateway access to external networks or the internet.

Addresses in the 169.254.0.0/16 range are automatically assigned by the operating system via APIPA when a DHCP server cannot be reached. APIPA enables link-local communication, allowing hosts on the same physical broadcast domain with APIPA addresses to communicate with each other.

Adım Adım Çözüm

Analyze the IP address output 169.254.112.45

Identify the IP address as belonging to the 169.254.0.0/16 address block reserved for Automatic Private IP Addressing (APIPA).

APIPA is activated by client operating systems when DHCP server discovery fails or times out.

Evaluate communication scope for APIPA addresses

Determine that local link-local traffic works between APIPA clients on the same switch/segment, but non-routable nature prevents external/internet communication.

APIPA configurations do not include a default gateway address.

Anahtar Kavram

APIPA Address Assignment and Scope Constraints

Soru 150Soru →

A network administrator is configuring firewall access control lists (ACLs) between a workstation VLAN and a dedicated server VLAN hosting network services. The administrator creates a rule allowing inbound traffic on UDP port 67 from the workstation subnet to the server, but client computers are still unable to acquire dynamic IP address assignments and default to APIPA addresses ( $169.254.x.x$ ). Which additional firewall rule must be configured to permit successful DHCP address allocation?

Permit outbound traffic on UDP port 68 from the DHCP server to the workstation subnet

Permit outbound traffic on TCP port 67 from the DHCP server to the workstation subnet

Permit inbound traffic on UDP port 53 from the workstation subnet to the DHCP server

Permit inbound traffic on TCP port 68 from the workstation subnet to the DHCP server

Cevabı ve açıklamayı göster

Cevap: Permit outbound traffic on UDP port 68 from the DHCP server to the workstation subnet

Cevap

Permit outbound traffic on UDP port 68 from the DHCP server to the workstation subnet

DHCP uses a two-port UDP structure for client-server communication. DHCP servers listen for incoming client broadcast requests on UDP port 67, while clients receive server broadcast/unicast responses (DHCPOFFER and DHCPACK) on UDP port 68. Permitting outbound UDP port 68 ensures server responses can pass through the firewall back to client workstations.

Adım Adım Çözüm

Identify the transport protocol and port requirements for DHCP operation.

DHCP uses UDP as its transport layer protocol and relies on two specific port numbers: UDP 67 for the server listener and UDP 68 for the client listener.

Because client discovery broadcasts originate before an IP address is assigned, client and server roles listen on distinct ports.

Analyze the bidirectional traffic flow between client and server.

The client sends DHCP Discover and Request packets to destination UDP port 67 on the server. The server responds with DHCP Offer and Acknowledgment (ACK) packets directed to destination UDP port 68 on the client.

If the firewall permits inbound UDP 67 but blocks outbound UDP 68, client requests reach the server, but server responses are dropped before reaching workstations.

Determine the necessary ACL modification to complete the handshake.

Outbound traffic on UDP port 68 from the server to the client subnet must be permitted.

Allowing outbound UDP 68 completes the bidirectional path required for workstations to successfully receive IP leases.

Anahtar Kavram

DHCP Port Allocation (UDP 67 / UDP 68)

Tahmini Süre:1m 30s

Soru 151Soru →

A network technician is updating the documentation for several dedicated server roles deployed across an enterprise network. Match each server role on the left with its primary host service function on the right.

Soldaki öğeye tıklayın, sonra eşleşen sağdaki öğeye tıklayın

Cevabı ve açıklamayı göster

Cevap

Directory Service (LDAP) matches with centralizing user identity attributes and queries; AAA Server (RADIUS) matches with enforcing authentication, authorization, and accounting at entry points; Network Management Server (SNMP) matches with monitoring hardware counters and statistics; File Share Host (SMB) matches with providing direct access to shared folders over TCP port 445.

Each host service is accurately paired with its primary network function: LDAP handles centralized directory identity queries, RADIUS handles AAA access enforcement, SNMP handles device health monitoring, and SMB handles network file sharing.

Adım Adım Çözüm

Evaluate the primary operational role of Directory Services (LDAP).

LDAP is dedicated to centralizing identity databases and serving directory queries.

Lightweight Directory Access Protocol enables centralized user management across enterprise systems.

Evaluate the primary operational role of AAA Servers (RADIUS).

RADIUS centralizes Network Access Control through authentication, authorization, and accounting.

AAA infrastructure validates client identity and enforces network perimeter permissions.

Evaluate the primary operational role of Network Management Servers (SNMP).

SNMP monitors system metrics and hardware health via periodic queries to device agents.

Simple Network Management Protocol provides status tracking and diagnostic metrics collection.

Evaluate the primary operational role of File Share Hosts (SMB).

SMB allows client systems to browse and write to remote shared directories over port 445.

Server Message Block is standard for local network file transfer and file system sharing.

Anahtar Kavram

Enterprise Network Host Services and Server Roles

Soru 152Soru →

A field technician is evaluating the infrastructure requirements for a financial firm expanding its presence in a city. The firm needs a high-speed fiber-optic network link connecting two corporate buildings located 12 miles apart across the metropolitan area. Additionally, the network engineering team must interconnect two distinct IP subnets ( $192.168.10.0/24$ and $192.168.20.0/24$ ) within the primary facility to allow routed communication between departments. Which network scope classification applies to the inter-building connection, and which networking device is required to enable communication between the two subnets?

Metropolitan Area Network (MAN) for the inter-building link, and a Layer 3 router for inter-subnet communication

Local Area Network (LAN) for the inter-building link, and an unmanaged Layer 2 switch for inter-subnet communication

Wide Area Network (WAN) for the inter-building link, and an unmanaged Layer 2 switch for inter-subnet communication

Personal Area Network (PAN) for the inter-building link, and a Layer 3 router for inter-subnet communication

Cevabı ve açıklamayı göster

Cevap: Metropolitan Area Network (MAN) for the inter-building link, and a Layer 3 router for inter-subnet communication

Cevap

The connection across a 12-mile city span is classified as a Metropolitan Area Network (MAN), and interconnecting two distinct IP subnets requires a Layer 3 router.

A Metropolitan Area Network (MAN) is specifically designed to interconnect locations across a city or town geographic radius (such as 12 miles). Furthermore, connecting separate IP subnets (Layer 3 network boundaries) requires a router or Layer 3 device capable of processing IP packet headers.

Adım Adım Çözüm

Analyze the geographic scope requirement for the inter-building link.

A 12-mile connection spanning across a single city/metropolitan region fits the definition of a Metropolitan Area Network (MAN), as it is larger than a single facility LAN and smaller than a broad regional WAN.

Geographic scope classifications are defined by distance bounds: PAN (<10m), LAN (single building/site), MAN (city/town scale), WAN (regional/global).

Analyze the routing and boundary requirements between the subnets 192.168.10.0/24 and 192.168.20.0/24.

Traffic moving between two distinct Layer 3 IP subnets requires a device capable of evaluating IP headers and making routing decisions.

Layer 2 switches forward traffic based on Ethernet MAC addresses within a single broadcast domain. A Layer 3 router or Layer 3 switch is necessary to cross logical IP subnet boundaries.

Combine the scope classification and hardware requirements to identify the correct option.

The correct combination is MAN for the geographic scope and a Layer 3 router for inter-subnet connectivity.

This option correctly satisfies both the distance classification criteria and the OSI Layer 3 routing requirements.

Anahtar Kavram

Network Scope Classifications (MAN vs. LAN/WAN/PAN) and Layer 3 Routing Boundaries

Tahmini Süre:1m 30s

Soru 153Soru →

A network administrator is designing a high-availability infrastructure for four core switches in a corporate data center. To eliminate single points of failure, the design requires every core switch to have a direct, dedicated physical connection to every other core switch. Which physical network topology is being implemented?

Mesh topology

Star topology

Bus topology

Ring topology

Cevabı ve açıklamayı göster

Cevap: Mesh topology

Cevap

Mesh topology

The correct answer is Mesh topology. In a full mesh topology, every device has a dedicated point-to-point link to every other device in the network. For four switches, this requires six dedicated interconnect links. If any single cable fails, traffic is immediately rerouted across alternative direct links, satisfying the requirement for high availability and eliminating single points of failure.

Adım Adım Çözüm

Analyze the requirements stated in the scenario

The network layout requires four core switches where every switch has a direct physical link to every other switch to ensure full redundancy.

Identifying the specific connection pattern and redundancy goal determines the physical topology.

Calculate the number of links required for a full mesh topology

For

n = 4

nodes, a full mesh requires

\frac{n(n-1)}{2} = \frac{4(3)}{2} = 6

direct physical links.

Verifying point-to-point interconnections confirms the full mesh topology classification.

Compare against alternative physical topologies

Star, bus, and ring topologies do not feature direct interconnections between every pair of nodes.

Only a mesh topology provides point-to-point dedicated links across all nodes for maximum fault tolerance.

Anahtar Kavram

Full Mesh Network Topology and Fault Tolerance

Soru 154Soru →

A technician is replacing the display components on a legacy laptop equipped with a Cold Cathode Fluorescent Lamp (CCFL) backlighting system. Which display component is responsible for converting direct current (DC) power from the motherboard into alternating current (AC) power to illuminate the backlight?

Inverter board

Digitizer panel

Wi-Fi antenna harness

OLED display panel

Cevabı ve açıklamayı göster

Cevap: Inverter board

Cevap

The inverter board is the component that converts low-voltage DC power into high-voltage AC power for a CCFL backlight.

In older laptop LCD screens that utilize Cold Cathode Fluorescent Lamp (CCFL) backlights, an inverter board is required to transform low-voltage DC power coming from the laptop's motherboard into high-voltage AC power to strike and light the fluorescent lamp.

Adım Adım Çözüm

Determine the power requirements of CCFL display technology.

CCFL backlights operate on high-voltage alternating current (AC).

Fluorescent lighting tubes require AC voltage to produce light, whereas the laptop motherboard provides low-voltage DC current.

Identify the component that converts DC voltage to AC voltage within the screen assembly.

The inverter board performs DC-to-AC power conversion.

The inverter board acts as a power converter specifically designed to drive CCFL backlights in LCD displays.

Anahtar Kavram

Laptop CCFL Backlighting and Inverter Boards

Soru 155Soru →

A field technician is setting up a wireless access point in a central hallway between two existing access points that operate on 2.4 GHz channels 1 and 11. To prevent signal interference while following standard 2.4 GHz channel allocation rules, which channel should the technician assign to the new access point?

Channel 6

Channel 2

Channel 5

Channel 10

Cevabı ve açıklamayı göster

Cevap: Channel 6

Cevap

Channel 6 is the correct choice because 1, 6, and 11 are the standard non-overlapping channels in the 2.4 GHz wireless frequency spectrum.

In 2.4 GHz wireless networking using standard 20 MHz channel widths, channels 1, 6, and 11 are the only three channels that do not overlap with each other. Given that adjacent access points already use channels 1 and 11, setting the middle access point to Channel 6 ensures zero adjacent-channel interference.

Adım Adım Çözüm

Identify the operating frequency band and channel spacing rules.

The 2.4 GHz Wi-Fi spectrum uses 20 MHz wide channels spaced 5 MHz apart.

Because channels overlap if separated by less than 25 MHz, only specific channels do not interfere with each other.

Determine the non-overlapping channel set for the 2.4 GHz band.

Channels 1, 6, and 11 provide maximum channel separation without spectral overlap.

Using these three channels allows adjacent access points to co-exist without adjacent-channel noise.

Select the missing non-overlapping channel from the given setup.

With channels 1 and 11 already assigned to neighbor access points, channel 6 fills the remaining non-overlapping assignment.

Assigning channel 6 completes a clean 2.4 GHz channel reuse scheme.

Anahtar Kavram

2.4 GHz Wireless Non-Overlapping Channels (1, 6, 11)

Tahmini Süre:45s

Soru 156Soru →

A technician is preparing to replace a swollen internal Lithium-ion battery in a corporate laptop. Place the following repair steps in the correct order from first to last to safely complete the battery replacement process.

Öğeleri doğru sıraya koymak için sürükleyin

Cevabı ve açıklamayı göster

Cevap

The correct sequence for safely replacing an internal swollen battery is: 1) Disconnect external AC power and shut down the laptop; 2) Remove the bottom enclosure panel; 3) Disconnect the internal battery power harness from the motherboard; 4) Unfasten and place the swollen battery in a fire-safe container; 5) Install the replacement battery, connect its harness, and secure the chassis cover.

The proper ordering prioritizes safety and electrical protection: disconnect external power first, open the enclosure, isolate internal electrical energy by disconnecting the battery connector from the motherboard, safely extract and contain the hazardous swollen battery, and finally install the replacement and close the chassis.

Adım Adım Çözüm

Isolate external power sources.

The AC adapter is unplugged and the laptop is completely powered off.

Prevents electrical shock and guards against accidental power delivery during initial handling.

Open the laptop lower casing.

The bottom chassis cover is removed, exposing internal components.

Access to non-removable internal laptop batteries requires removing the base plate.

Isolate internal electrical circuits.

The battery harness is detached from the system motherboard connector.

Disconnecting internal battery power before loosening internal screws prevents tool-induced short circuits on the motherboard.

Remove and contain the compromised battery.

The swollen Li-ion battery is unfastened and placed into a hazardous thermal safety vessel.

Physical swelling indicates gas accumulation inside cells; immediate isolation in a fire-safe storage container prevents fire hazards.

Install replacement hardware and close enclosure.

New battery is seated, wired to the system board, and base chassis is closed.

Restores laptop operation to a safe, functional state.

Anahtar Kavram

Internal Swollen Battery Safe Replacement Procedure

Tahmini Süre:1m 30s

Soru 157Soru →

A field technician is troubleshooting a corporate laptop whose internal display screen remains completely dark. Connecting an external monitor confirms that the operating system and GPU are functioning normally. When shining a high-intensity flashlight closely onto the laptop screen, the technician can faintly perceive active desktop windows and the mouse cursor. Upon removing the display bezel to inspect internal connections, the technician observes that no inverter board is installed within the display housing. Which of the following best explains why an inverter board is absent in this laptop display design and identifies the illumination source?

The laptop uses an LED-backlit LCD screen, which receives low-voltage DC power directly from the motherboard via the video cable without requiring a high-voltage AC inverter.

The display relies on an OLED panel that incorporates cold cathode fluorescent lamps (CCFL) driven directly by the system bus without voltage conversion.

The inverter board logic has been integrated into the glass digitizer panel, requiring the touch surface assembly to be replaced whenever backlight illumination fails.

Inverter circuitry is only necessary when outputting to external monitors, whereas internal display illumination is managed entirely by software driver firmware.

Cevabı ve açıklamayı göster

Cevap: The laptop uses an LED-backlit LCD screen, which receives low-voltage DC power directly from the motherboard via the video cable without requiring a high-voltage AC inverter.

Cevap

LED-backlit LCD displays receive direct low-voltage DC power from the motherboard through the video cable, making a separate high-voltage AC inverter board unnecessary.

The faint image visible under direct light confirms that the LCD layer is working, but the backlighting is off. Modern laptops use LED backlights which operate on low-voltage DC provided directly through the main video cable from the motherboard. Therefore, no high-voltage AC inverter board is required or present in the display housing.

Adım Adım Çözüm

Analyze the reported symptom (faint image visible with a flashlight).

Confirm that the LCD display matrix, GPU, and system board are rendering video correctly, but the display backlight system has failed.

A visible faint image under external light indicates the liquid crystals are functioning, but illumination behind the screen is missing.

Evaluate the physical component observations inside the display assembly.

Identify that the laptop lacks an inverter board because it utilizes light-emitting diode (LED) backlighting rather than cold cathode fluorescent lamp (CCFL) backlighting.

Older CCFL backlights required high-voltage AC provided by an inverter board, whereas modern LED backlights use low-voltage DC directly from the system board.

Anahtar Kavram

Laptop LED Backlight Architecture vs. Legacy CCFL Inverters

Tahmini Süre:2m 0s

Soru 158Soru →

A field service technician is troubleshooting a corporate smartphone used inside a crowded multi-AP facility. The phone experiences severe throughput degradation and frequent packet loss while connected to the 2.4 GHz Wi-Fi network, despite displaying a strong signal indicator. A site survey reveals that the local access point is broadcasting on 2.4 GHz Channel 4, while neighboring access points are actively transmitting on Channel 1 and Channel 6. Which of the following actions should the technician take to resolve the mobile device's connectivity issue?

Reconfigure the access point to broadcast on non-overlapping Channel 11.

Change the access point channel to Channel 3 to evenly divide frequency usage between Channels 1 and 6.

Assign a static APIPA address (169.254.10.15) to the mobile device to bypass wireless channel negotiation overhead.

Update the mobile device's IMSI stored in the network profile to force dynamic channel selection.

Cevabı ve açıklamayı göster

Cevap: Reconfigure the access point to broadcast on non-overlapping Channel 11.

Cevap

Reconfigure the access point to broadcast on non-overlapping Channel 11.

In the 2.4 GHz wireless spectrum, each channel occupies 22 MHz of bandwidth while channels are spaced only 5 MHz apart. To prevent adjacent-channel interference, wireless networks must use non-overlapping channels (1, 6, and 11). Operating on Channel 4 causes overlap with both Channel 1 and Channel 6. Moving the access point to Channel 11 resolves the radio frequency interference for connected mobile devices.

Adım Adım Çözüm

Analyze the symptoms and environmental survey data.

The mobile device shows high signal strength but experiences packet loss and latency on 2.4 GHz Channel 4 due to adjacent access points using Channels 1 and 6.

In the 2.4 GHz Wi-Fi spectrum, channels overlap significantly unless separated by at least 5 channels.

Identify the standard non-overlapping 2.4 GHz channels.

Channels 1, 6, and 11 are the three standard non-overlapping channels in North America/International 2.4 GHz deployments.

Channel 4 overlaps with both Channel 1 (2412 MHz) and Channel 6 (2437 MHz), causing destructive adjacent-channel interference.

Select the correct mitigation strategy.

Reconfiguring the AP to Channel 11 isolates its spectrum from Channels 1 and 6.

Shifting the frequency band to Channel 11 restores reliable wireless packet delivery for mobile clients.

Anahtar Kavram

2.4 GHz Wi-Fi non-overlapping channel selection (Channels 1, 6, 11) to eliminate adjacent-channel interference.

Tahmini Süre:2m 0s

Soru 159Soru →

A field technician is replacing a swollen internal Lithium-ion battery and a damaged internal DC power jack inside an enterprise laptop. Which TWO of the following actions should the technician take to perform this repair safely and correctly?

Geçerli olan tümünü seçin

Disconnect the external AC power adapter and disable or disconnect the battery before handling internal components.

Fully drain the swollen battery to 0% using a continuous hardware stress test prior to removal to calibrate the chemical cells.

Carefully route internal power wiring along chassis cable guides to prevent wire pinching when securing the bottom panel.

Upgrade the laptop system memory using standard 288-pin desktop DIMM modules while the chassis is open.

Cevabı ve açıklamayı göster

Cevap: Disconnect the external AC power adapter and disable or disconnect the battery before handling internal components.; Carefully route internal power wiring along chassis cable guides to prevent wire pinching when securing the bottom panel.

Cevap

The technician must disconnect the AC power adapter and internal battery before handling hardware, and route internal cabling cleanly along designated chassis channels to prevent pinching during reassembly.

Servicing internal laptop components safely requires removing all power sources (external AC power and the internal battery) to avoid electrical short circuits. Additionally, internal power wiring must be routed cleanly through chassis channels to prevent pinched or cut wires during reassembly.

Adım Adım Çözüm

Isolate all power sources by disconnecting the external AC adapter and removing or unplugging the internal battery connection.

The motherboard and internal components are completely de-energized.

Working on laptop components under live electrical power risks short-circuiting sensitive surface-mount devices or causing electrical injury.

Install the replacement DC power jack and route its wiring through built-in chassis guides.

Cables lie flat within assigned channels away from screw holes and outer casing seams.

Pinching wires under chassis covers can strip cable insulation, leading to electrical shorts or hardware failure.

Anahtar Kavram

Laptop Hardware Safety, Disassembly, and Cabling Best Practices

Tahmini Süre:1m 15s

Soru 160Soru →

A technician is terminating twisted-pair Ethernet cables in a office installation following the ANSI/TIA T568B wiring standard. Which of the following pin assignments correctly follow the T568B standard? (Select TWO.)

Geçerli olan tümünü seçin

Pin 1 is White/Orange and Pin 2 is Solid Orange.

Pin 3 is White/Green and Pin 6 is Solid Green.

Pin 1 is White/Green and Pin 2 is Solid Green.

Pin 3 is White/Orange and Pin 6 is Solid Orange.

Cevabı ve açıklamayı göster

Cevap: Pin 1 is White/Orange and Pin 2 is Solid Orange.; Pin 3 is White/Green and Pin 6 is Solid Green.

Cevap

In the T568B wiring standard, Pin 1 is White/Orange, Pin 2 is Solid Orange, Pin 3 is White/Green, and Pin 6 is Solid Green.

Under the T568B wiring standard, the orange pair is assigned to pins 1 and 2 (White/Orange, Solid Orange) and the green pair is split across pins 3 and 6 (White/Green, Solid Green).

Adım Adım Çözüm

Recall the ANSI/TIA T568B pinout standard color sequence.

The T568B sequence from Pin 1 to Pin 8 is: 1: White/Orange, 2: Orange, 3: White/Green, 4: Blue, 5: White/Blue, 6: Green, 7: White/Brown, 8: Brown.

Standard specification compliance for RJ45 cable termination.

Match the given options to the T568B specification.

The options specifying Pin 1 as White/Orange with Pin 2 as Solid Orange, and Pin 3 as White/Green with Pin 6 as Solid Green are verified as correct.

Accurate standard identification.

Anahtar Kavram

ANSI/TIA T568B Cabling Pinout

ÖncekiSayfa 8 / 178Sonraki

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