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Soru 401Soru →

An enterprise client workstation sends a DNS name resolution request for an external web service to its local internal Active Directory DNS server. The internal DNS server is configured to perform recursion but does not hold an authoritative zone or a local cached entry for the requested domain name. Which action does the internal DNS server perform to resolve the query for the client workstation?

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Cevap: It performs iterative queries against external root, top-level domain (TLD), and authoritative DNS servers on behalf of the workstation and returns the final resolution result to the client.

Cevap

The internal DNS server performs iterative queries against root, TLD, and authoritative DNS servers on behalf of the workstation and returns the resolved address to the client.
In enterprise network operations, host workstations make recursive DNS queries to an assigned internal DNS server. When the internal DNS server does not possess the record in cache or local authoritative zones, it acts as a recursive resolver by sending a series of iterative queries to external root, TLD, and authoritative servers. Once the final IP address is retrieved, the internal DNS server sends the answer back to the client host.

Adım Adım Çözüm

1
Analyze client-to-DNS resolver request type
The client host sends a recursive query to its configured local internal DNS server, delegating the full lookup task to that server.
End-user hosts rely on internal recursive resolvers to handle multi-step domain hierarchy queries.
2
Evaluate internal DNS server cache and authority state
The server has no local zone authority or cached entry for the external domain.
Because it lacks local answers, the recursive server must query external hierarchy servers starting at the root level.
3
Trace external resolution mechanism
The internal DNS server performs iterative requests upstream (Root -> TLD -> Authoritative Server) until obtaining the final record, which it caches and sends back to the client workstation.
This insulates internal clients from direct internet exposure and centralizes enterprise DNS caching.

Anahtar Kavram

DNS Recursive Resolver vs Iterative Query Roles in Enterprise Name Resolution
Tahmini Süre:1m 15s
Soru 402Soru →

An internal host in an enterprise network queries the corporate DNS server to resolve the Fully Qualified Domain Name (FQDN) of an external cloud service. The internal DNS server does not hold the authoritative zone file for the requested external domain. Assuming standard recursive resolution is enabled on the server, which action does the internal DNS server take to resolve the query for the client?

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Cevap: It queries external DNS servers on behalf of the host by following the DNS hierarchy until it receives the answer and returns it to the host.

Cevap

The internal DNS server queries external DNS servers on behalf of the host by traversing the DNS hierarchy until it receives the answer and returns it to the host.
In enterprise networks, an internal DNS server configured for recursion acts as a recursive resolver for LAN clients. When a host requests resolution for a domain that the server is not authoritative for, the server performs the iterative lookups across external DNS servers (Root, TLD, and Authoritative) on behalf of the client and returns the resolved IP address.

Adım Adım Çözüm

1
Analyze the role of a recursive DNS server in enterprise name resolution.
A recursive DNS resolver accepts queries from local host clients and resolves names for domains outside its local authority.
Internal hosts are generally configured to point to an internal recursive resolver rather than querying root internet DNS servers directly.
2
Trace the recursive DNS lookup flow for non-authoritative external domains.
The internal DNS server queries the DNS hierarchy (Root →\rightarrow Top-Level Domain →\rightarrow Authoritative Server) on behalf of the requesting host.
Recursion delegates the responsibility of traversing the global DNS tree to the DNS server rather than forcing the client to issue iterative queries.
3
Return the final response to the host client.
Once the authoritative answer is returned to the enterprise DNS server, it caches the record and sends the IP resolution back to the host.
This process provides seamless name resolution and allows the enterprise server to cache records locally for future requests.

Anahtar Kavram

Recursive DNS Query Resolution Flow and Server Roles
Tahmini Süre:1m 0s
Soru 403Soru →

An enterprise network administrator is analyzing DNS name resolution behavior across a router configured for local host name lookup. During troubleshooting of large DNS response payloads generated by DNSSEC queries, the administrator notices changes in transport layer protocol utilization. Which two statements correctly describe DNS transport protocol operation and name resolution mechanics in this scenario? (Select TWO.)

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Cevap: When a DNS server response exceeds the 512-byte limit standard for traditional UDP DNS messages without EDNS0 extensions, the server returns a response header with the Truncation (TC) bit set, signaling the requesting client to re-query using TCP port 53.; DNS query operations primarily utilize UDP port 53 for low-latency name resolution, but fall back to TCP port 53 for transactions requiring guaranteed delivery or large data transfers such as zone transfers and truncated responses.

Cevap

The correct answers state that a DNS response exceeding 512 bytes without EDNS0 sets the Truncation (TC) bit to prompt a re-query via TCP port 53, and that DNS uses UDP port 53 for standard low-overhead queries while utilizing TCP port 53 for large transfers, zone synchronization, and truncated responses.
DNS relies primarily on UDP port 53 for client lookups to minimize network overhead and latency. However, when a UDP DNS response exceeds 512 bytes (without EDNS0), the DNS server sets the Truncation (TC) bit in the header, instructing the client to establish a TCP port 53 connection to retrieve the complete record set. TCP port 53 is also explicitly required for zone transfers between DNS servers.

Adım Adım Çözüm

1
Analyze standard DNS transport mechanisms and protocol defaults.
DNS uses UDP port 53 for standard name resolution queries due to connectionless efficiency, while TCP port 53 is used for reliability and data payload requirements exceeding UDP bounds.
Understanding transport protocol selection helps evaluate host and server behavior under varying query conditions.
2
Evaluate the behavior when DNS responses exceed maximum UDP message size limits.
Standard UDP DNS responses cap at 512 bytes. When records (such as DNSSEC or large TXT fields) overflow this boundary without EDNS0 support, the server flags the Truncation (TC) bit in the DNS header.
The TC bit alerts the client that data was omitted and instructs the resolver to re-issue the full query over a stateful TCP connection.
3
Identify misidentifications regarding UDP capabilities and DNS server resolution mechanics.
UDP cannot perform sliding window acknowledgments or dynamic payload adjustments because it lacks header fields for sequencing and flow control.
Eliminates options that attribute TCP connection-oriented mechanisms to UDP.

Anahtar Kavram

DNS Transport Protocols and Payload Truncation Mechanics
Soru 404Soru →

A network administrator is configuring an IPv4 static route on router R1 to reach the remote network 10.10.40.0/2410.10.40.0/24 across an Ethernet multiaccess segment. After issuing the command `ip route 10.10.40.0 255.255.255.0 GigabitEthernet0/0`, the administrator observes high CPU utilization and a large ARP table on R1 because the router attempts to resolve ARP for every individual destination host address in the remote network. Which command modification correctly resolves this issue while maintaining reachability?

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Cevap: Specify the next-hop IPv4 address instead of specifying only the Ethernet exit interface.

Cevap

Specify the next-hop IPv4 address instead of specifying only the Ethernet exit interface.
When a static route on a broadcast multiaccess link (like Ethernet) points solely to an exit interface without a next-hop IP address, the router considers all host addresses in the destination subnet directly connected. Consequently, for every destination packet, the router broadcasts an ARP request on the local segment. Specifying the next-hop IPv4 address ensures the router sends packets to the specific neighbor router's MAC address, preventing ARP flooding and excessive memory usage.

Adım Adım Çözüm

1
Analyze the static route syntax and multiaccess interface behavior.
Configuring `ip route` on a multiaccess Ethernet link with only an exit interface causes the router to assume the destination prefix is directly attached to that Ethernet segment.
Because Ethernet is a multiaccess medium with multiple potential devices, the router must send an ARP request for every single destination IP address in the prefix if no next-hop IP is specified.
2
Determine the solution for multiaccess static route next-hop resolution.
Including the next-hop IPv4 address (e.g., `ip route 10.10.40.0 255.255.255.0 192.168.1.2` or combining next-hop IP and exit interface) allows R1 to resolve ARP only for the next-hop router's IP address.
This avoids generating ARP requests for remote host IPs and prevents ARP table exhaustion and excessive CPU load.

Anahtar Kavram

Next-Hop IPv4 Address vs. Exit Interface in Multiaccess Static Routes
Tahmini Süre:1m 30s
Soru 405Soru →

A network engineer is configuring first-hop redundancy for VLAN 20 on two Cisco IOS routers, R1 and R2. Interface GigabitEthernet0/0 on R1 is assigned IPv4 address 10.20.0.2/24, and GigabitEthernet0/0 on R2 is assigned 10.20.0.3/24. The engineer attempts to configure HSRP group 20 on R1 using the command `standby 20 ip 10.20.0.2`. The Cisco IOS CLI rejects the command with an error message. However, when configuring VRRP using `vrrp 20 ip 10.20.0.2`, the command is accepted successfully. What fundamental operational difference between HSRP and VRRP causes this behavior?

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Cevap: VRRP permits the virtual IP address to match the physical IP address of a router interface, appointing that router as the IP address owner with a default priority of 255, whereas HSRP strictly prohibits assigning any router's physical IP address as the virtual IP.

Cevap

VRRP permits the virtual IP address to match the physical IP address of a router interface, appointing that router as the IP address owner with a default priority of 255, whereas HSRP strictly prohibits assigning any router's physical IP address as the virtual IP.
In Cisco IOS, HSRP mandates that the virtual IP address must be a unique IP address on the subnet and cannot be identical to any physical IP address configured on a router's interface. In contrast, VRRP allows the virtual IP address to match the interface physical IP address; the router whose physical IP matches the VRRP group virtual IP assumes the role of Master with an unalterable priority of 255 (IP address owner).

Adım Adım Çözüm

1
Analyze the HSRP virtual IP configuration restriction.
HSRP requires that the virtual IP address defined in `standby <group> ip <address>` must be a unique, unused IP address on the subnet, separate from all physical interface IP addresses of the participating routers.
Assigning an existing physical IP address as an HSRP virtual IP address causes an IP overlap/conflict on the interface and is rejected by the Cisco IOS CLI.
2
Analyze the VRRP virtual IP configuration capability.
VRRP allows the virtual IP address to be identical to the primary physical IP address of one of the VRRP routers. The router owning that physical IP becomes the IP Address Owner and automatically receives a VRRP priority of 255.
VRRP standard RFC 5798 explicitly defines the IP address owner role to allow interface IP address sharing.
3
Select the option that accurately contrasts this behavior between HSRP and VRRP.
The correct response highlights that VRRP allows IP address ownership with a priority of 255 while HSRP prohibits physical IP reuse as the virtual IP.
This directly explains why HSRP rejected the configuration while VRRP accepted it.

Anahtar Kavram

HSRP vs VRRP Virtual IP Address Assignment and IP Address Ownership
Soru 406Soru →

Match each Cisco Layer 2 security feature to its primary function in mitigating network attacks.

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Öğeler

Port Security
DHCP Snooping
Dynamic ARP Inspection (DAI)

Eşleşmeler

Cevabı ve açıklamayı göster

Cevap

Port Security pairs with restricting MAC addresses allowed on an interface. DHCP Snooping pairs with filtering rogue DHCP server packets and maintaining the DHCP binding database. Dynamic ARP Inspection pairs with validating ARP packets against the DHCP binding database.
Port Security controls frame forwarding by restricting access to specified MAC addresses. DHCP Snooping protects against rogue DHCP servers and creates the IP-to-MAC binding table. Dynamic ARP Inspection inspects ARP packets against this binding table to stop ARP poisoning.

Adım Adım Çözüm

1
Determine the primary operational role of Port Security.
Port Security restricts interface access based on learned or configured MAC addresses.
It prevents unauthorized devices from attaching to switch ports and limits MAC flooding.
2
Determine the primary operational role of DHCP Snooping.
DHCP Snooping acts as a L2 firewall between untrusted hosts and DHCP servers.
It drops unauthorized DHCP server offers on untrusted ports and populates the IP-to-MAC binding table.
3
Determine the primary operational role of Dynamic ARP Inspection (DAI).
DAI inspects ARP packets on untrusted switch interfaces.
It uses the binding database established by DHCP Snooping to validate ARP requests and responses, mitigating man-in-the-middle attacks.

Anahtar Kavram

Layer 2 Security Features (Port Security, DHCP Snooping, DAI)
Soru 407Soru →

An enterprise network security team is evaluating its defense-in-depth posture across a multi-tenant facility hosting critical infrastructure. How should each specific security measure be matched to its primary security program element or physical control category?

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Öğeler

Mandatory quarterly simulated phishing exercises accompanied by automated user reporting drills
Biometric fingerprint authentication paired with anti-passback electronic turnstiles at facility entry points
Formal security incident escalation procedures and documented employee offboarding credential revocation policies
Locking equipment rack enclosures equipped with micro-switch chassis intrusion sensors connected to an alarm panel

Eşleşmeler

Cevabı ve açıklamayı göster

Cevap

The correct matches align each operational security initiative with its designated classification: (1) Simulated phishing and user reporting drills match the User Security Awareness Program; (2) Biometric turnstiles match Physical Access Control Mechanisms; (3) Escalation workflows and offboarding policies match Administrative Security Governance; (4) Locked equipment cabinets with tamper sensors match Physical Asset Protection & Tamper Monitoring.
Each security measure correctly maps to its standard functional category within Cisco CCNA security program fundamentals: phishing simulations develop human security awareness; biometric turnstiles control physical perimeter entry; incident response and offboarding rules provide administrative governance; and locked cabinets with intrusion alarms provide physical protection for hardware assets.

Adım Adım Çözüm

1
Analyze the operational focus of each security measure on the left to determine whether it addresses human behavior, physical entry, administrative policy, or asset containment.
Identified four distinct security domains: human risk reduction, perimeter access restriction, policy governance, and equipment-level physical protection.
Classifying security elements requires differentiating administrative policies, physical barriers, physical asset protection, and educational programs.
2
Associate simulated phishing drills with human defense mechanisms.
Pairs with User Security Awareness Program.
Phishing simulations educate staff and evaluate their ability to spot malicious communications, strengthening the human security perimeter.
3
Associate biometric turnstiles with physical facility entry control.
Pairs with Physical Access Control Mechanism.
Biometric scanners and physical turnstiles physically impede unauthorized entry into building zones.
4
Associate incident escalation guidelines and offboarding revocation procedures with operational governance.
Pairs with Administrative Security Governance.
Administrative controls consist of written policies, standard operating procedures, and management guidelines that govern organizational actions.
5
Associate locking cabinets and chassis tamper switches with hardware protection.
Pairs with Physical Asset Protection & Tamper Monitoring.
Locking racks and tamper sensors physically secure installed networking hardware against unauthorized physical tampering or theft.

Anahtar Kavram

Classification of Security Program Elements and Physical Access Controls
Soru 408Soru →

A network administrator needs to deploy several new Cisco switches across enterprise branch offices. Which Cisco DNA Center feature enables zero-touch onboarding to provision these unconfigured network devices automatically upon initial power-on?

Cevabı ve açıklamayı göster

Cevap: Network Plug and Play (PnP)

Cevap

Network Plug and Play (PnP) is the Cisco DNA Center feature responsible for zero-touch provisioning of new devices.
Network Plug and Play (PnP) provides a unified, secure system for Cisco DNA Center customers to onboard new Cisco routers, switches, and wireless access points with zero-touch provisioning. Unconfigured devices contact Cisco DNA Center automatically using DHCP option 43, DNS, or Cisco Smart Call Home to retrieve configuration files and initial images.

Adım Adım Çözüm

1
Identify the primary requirement in the scenario.
The requirement is zero-touch onboarding of unconfigured devices upon initial power-on.
Branch deployments require automated Day-0 provisioning without manual console interaction.
2
Evaluate Cisco DNA Center functional pillars against the requirement.
Network Plug and Play (PnP) handles Day-0 automated discovery and provisioning.
PnP connects unconfigured devices to Cisco DNA Center via DHCP or DNS discovery to download configuration and software images.

Anahtar Kavram

Cisco DNA Center Network Plug and Play (PnP) Day-0 Provisioning
Soru 409Soru →

An enterprise network operations team is transitioning from managing 500 access switches individually via manual CLI sessions to using a centralized, controller-driven automation framework. Which operational benefit directly results from adopting this automated network management model?

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Cevap: Device configurations are defined using centralized software templates and applied via programmatic APIs, significantly reducing configuration drift and human error.

Cevap

Device configurations are defined using centralized software templates and applied via programmatic APIs, significantly reducing configuration drift and human error.
Moving from per-device CLI management to a centralized automation framework enables network administrators to define configurations centrally as standardized data models or templates. Pushing these configurations via programmatic APIs ensures compliance across all target devices, virtually eliminating manual entry errors and configuration drift.

Adım Adım Çözüm

1
Analyze the operational transition from traditional CLI management to centralized automation.
Traditional management relies on individual per-device CLI configuration over SSH, leading to inconsistency (configuration drift) and high risk of human error.
Per-device manual configuration does not scale efficiently across hundreds of network devices.
2
Identify the primary benefit of controller-driven API management.
Centralized controllers enforce intent-based network management where policy and configuration templates are pushed automatically via RESTful or RPC APIs.
Template-driven deployment ensures configuration consistency across the entire infrastructure.

Anahtar Kavram

Impact of Centralized Controller-Based Automation on Network Operations
Soru 410Soru →

What is the correct sequential order of steps required to deploy a new baseline software update across enterprise switches using Cisco DNA Center Software Image Management (SWIM)?

Öğeleri doğru sıraya koymak için sürükleyin

Cevabı ve açıklamayı göster

Cevap

The correct operational order for Cisco DNA Center Software Image Management (SWIM) is: 1) Import the software image into the repository, 2) Tag the image as Golden for the target device family, 3) Perform a compliance audit against inventory devices, and 4) Distribute and activate the image on non-compliant devices.
The standard Cisco DNA Center Software Image Management (SWIM) workflow follows four logical phases: image intake into the central repository, designating the image as Golden to define baseline compliance rules, performing compliance audits against managed network inventory, and finally scheduling distribution and activation to upgrade non-compliant hardware.

Adım Adım Çözüm

1
Ingest software image
The software file is available locally within Cisco DNA Center image management.
The controller cannot manage or deploy images that have not been ingested into its central repository.
2
Define Golden Image standard
A software baseline is established for a specific switch family or role.
Designating an image as Golden tells the controller which version devices of that family are expected to run.
3
Execute compliance audit
Devices running mismatched software versions are marked non-compliant.
Compliance audits compare active device inventory versions against the assigned Golden image baseline.
4
Deploy image (distribute & activate)
Target devices are upgraded to the Golden software image.
Distributing transfers the file to device storage, and activation applies the update and reboots the hardware.

Anahtar Kavram

Cisco DNA Center Software Image Management (SWIM) Lifecycle
Soru 411Soru →

An enterprise network team is transitioning from traditional per-device CLI configuration management to a centralized, API-driven network automation framework using controller-based orchestration and configuration management tools. During an operational review, engineers highlight that out-of-band manual CLI edits performed directly on individual switches regularly cause configuration drift and compliance failures across sites. Which operational shift brought by network automation directly mitigates this specific issue?

Cevabı ve açıklamayı göster

Cevap: Establishing a centralized single source of truth that enables continuous compliance auditing and automated state reconciliation to remediate local configuration drift.

Cevap

Establishing a centralized single source of truth that enables continuous compliance auditing and automated state reconciliation to remediate local configuration drift.
Centralized network automation replaces ad-hoc local CLI changes with a single source of truth (such as version-controlled repositories or controller-based policies). Automated systems continuously monitor device states, detect configuration drift caused by manual intervention, and automatically re-apply standard configurations to restore compliance across the network infrastructure.

Adım Adım Çözüm

1
Identify the core operational problem described in the scenario.
The primary issue is configuration drift resulting from manual, out-of-band CLI changes on individual switches across multiple sites.
Traditional per-device management creates inconsistency because manual local changes are not tracked centrally.
2
Evaluate how network automation shifts operational management models.
Automation shifts configuration management from decentralized manual entry to central controller/repository orchestration (version-controlled single source of truth).
By defining intent centrally (e.g., via Git, DNA Center, or Ansible playbooks), automation tools can periodically validate real-time device states against defined templates.
3
Match the solution to the specific mitigation outcome.
Automated compliance checks detect discrepancies between actual device states and intended states, enforcing automated reconciliation to reverse manual CLI edits.
This directly resolves configuration drift and enforces enterprise-wide consistency.

Anahtar Kavram

Impact of Automation on Network Management - Configuration Drift and Centralized Single Source of Truth
Soru 412Soru →

A network engineer is deploying new Cisco Catalyst switches across multiple branch offices using Cisco DNA Center Network Plug and Play (PnP). The switches are unpacked and powered on with default factory settings. Which mechanism enables these unconfigured devices to locate the Cisco DNA Center controller for Day-0 automated onboarding?

Cevabı ve açıklamayı göster

Cevap: DHCP Option 43 configured on the local DHCP server specifying the Cisco DNA Center controller IP address.

Cevap

DHCP Option 43 configured on the local DHCP server specifying the Cisco DNA Center controller IP address.
In Cisco Network Plug and Play (PnP), factory-default devices request an IP address via DHCP upon boot. By configuring DHCP Option 43 on the local DHCP server, the server returns vendor-specific information containing the IP address or URL of the Cisco DNA Center PnP server, enabling the switch to automatically contact the controller for Day-0 provisioning.

Adım Adım Çözüm

1
Identify the requirement for Day-0 network device onboarding in Cisco DNA Center.
The devices are in a factory-default state without IP addresses or SSH credentials configured.
Day-0 provisioning relies on Network Plug and Play (PnP) zero-touch discovery mechanisms.
2
Evaluate how unconfigured devices request network configuration and controller location.
Upon booting, the device sends a DHCP request to acquire an IP address and vendor-specific DHCP options.
DHCP Option 43 conveys the IP address of the PnP server (Cisco DNA Center) to the device.
3
Select the correct discovery mechanism.
DHCP Option 43 allows the switch to automatically locate and establish communication with Cisco DNA Center.
This enables fully automated, zero-touch Day-0 device provisioning.

Anahtar Kavram

Cisco DNA Center Network Plug and Play (PnP) Day-0 Discovery
Soru 413Soru →

An enterprise network engineer is using Cisco DNA Center Software Image Management (SWIM) to standardize software images across a fleet of Catalyst access switches. A target switch is currently flagged as non-compliant against the designated Golden Image. When the engineer initiates the software image distribution and activation workflow from Cisco DNA Center, which operational sequence does the controller follow to complete the upgrade?

Cevabı ve açıklamayı göster

Cevap: Cisco DNA Center runs pre-upgrade checks, copies the Golden Image file to the switch storage, verifies checksum integrity, updates the boot order, reboots the switch, and performs post-upgrade compliance checks.

Cevap

Cisco DNA Center runs pre-upgrade checks, copies the Golden Image file to the switch storage, verifies checksum integrity, updates the boot order, reboots the switch, and performs post-upgrade compliance checks.
The correct answer accurately outlines the step-by-step process of Cisco DNA Center Software Image Management (SWIM). SWIM performs pre-checks (such as storage availability validation), securely distributes the software image to the switch local flash, validates the checksum to prevent image corruption, updates the device boot options, reboots the switch to load the new image, and runs post-checks to confirm device health and Golden Image compliance.

Adım Adım Çözüm

1
Analyze the Software Image Management (SWIM) workflow in Cisco DNA Center.
SWIM is structured into two main operational phases: Distribution (copying image to device) and Activation (applying and rebooting).
Separating distribution from activation allows network administrators to pre-stage software images during production hours and schedule activations during maintenance windows.
2
Identify the automated checks and execution steps performed during SWIM execution.
Pre-upgrade checks verify disk space and hardware compatibility, the image file is transferred securely, MD5/SHA integrity checks confirm file soundness, boot variable statements are updated, the switch reboots into the new software version, and post-upgrade validation confirms operational health and golden image compliance.
These structured validation steps ensure minimal risk of device corruption or unrecoverable boot failure during automated controller-led updates.

Anahtar Kavram

Cisco DNA Center Software Image Management (SWIM) Workflow
Tahmini Süre:2m 0s
Soru 414Soru →

Match each network management paradigm or mechanism on the left with its corresponding operational impact on enterprise network management on the right.

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Öğeler

Model-Driven Streaming Telemetry
Declarative Configuration Management
Centralized API Orchestration
Continuous Automated Compliance Auditing

Eşleşmeler

Cevabı ve açıklamayı göster

Cevap

Model-Driven Streaming Telemetry matches with eliminating periodic SNMP polling via real-time YANG subscriptions. Declarative Configuration Management matches with defining the intended end-state policy. Centralized API Orchestration matches with replacing per-device manual CLI configuration with programmatic REST operations. Continuous Automated Compliance Auditing matches with preventing configuration drift against a version-controlled single source of truth.
Each automated management paradigm addresses a key inefficiency of traditional CLI and legacy monitoring. Streaming telemetry converts monitoring from reactive pull-based polling to proactive push-based streaming using YANG schemas. Declarative tools focus on target state definition, allowing automation engines to compute differential changes automatically. Centralized APIs eliminate fragmenting configuration management across hundreds of individual SSH sessions. Automated compliance auditing establishes a deterministic feedback loop between live infrastructure and source control repositories to eliminate configuration drift.

Adım Adım Çözüm

1
Analyze the operational role of Model-Driven Streaming Telemetry.
Identified as a push-based telemetry framework using structured YANG models to deliver near real-time operational data without SNMP polling overhead.
Traditional SNMP uses pull-based polling that degrades control plane performance under scale, whereas telemetry streams data continuously.
2
Differentiate between Imperative and Declarative Configuration Management paradigms.
Declarative management describes 'what the network state should be' rather than 'how to execute each CLI step'.
Declarative models allow administrators to define target states in data files (e.g., JSON/YAML) while the controller handles enforcement.
3
Evaluate the operational transition from per-device CLI management to Centralized API Orchestration.
Centralized API orchestration uses northbound/southbound RESTful endpoints to programmatically push changes across many devices simultaneously.
This shifts management from isolated SSH/Telnet sessions to repeatable software-driven transactions.
4
Examine the mechanism for preventing and mitigating configuration drift in automated environments.
Continuous automated compliance tools poll or listen for changes and compare running configurations against a version-controlled single source of truth.
Manual changes lead to state inconsistency (drift); automated auditing detects unauthorized modifications and enforces policy alignment.

Anahtar Kavram

Impact of Automation on Network Management Paradigms
Tahmini Süre:2m 30s
Soru 415Soru →

An enterprise network engineer successfully performs discovery and inventory integration for a Cisco Catalyst 9300 switch within Cisco DNA Center using SNMPv3 and SSH credentials. In the Cisco DNA Center inventory, the switch shows a status of Reachable. However, when navigating to the Assurance dashboard, the overall health score for the switch continuously reads N/A, and no telemetry data or health metrics are displayed. Further inspection shows that ICMP, SSH (TCP port 22), and SNMPv3 (UDP port 161) traffic are completely permitted through firewalls between Cisco DNA Center and the switch. Which condition is the most likely root cause for the missing Assurance health metrics?

Cevabı ve açıklamayı göster

Cevap: NETCONF traffic over TCP port 830 is blocked by an intervening security policy, preventing Cisco DNA Center from deploying telemetry profiles and establishing model-driven telemetry subscriptions.

Cevap

The missing Assurance metrics are caused by NETCONF traffic over TCP port 830 being blocked by an intervening security policy, which prevents Cisco DNA Center from deploying telemetry profiles and establishing model-driven telemetry subscriptions.
Cisco DNA Center uses NETCONF (TCP port 830) to push network telemetry profiles and configure model-driven telemetry streaming on Catalyst switches. When SSH and SNMP are allowed, basic reachability and discovery succeed; however, if TCP port 830 is blocked by a firewall, Cisco DNA Center cannot apply the necessary telemetry subscriptions, causing the Assurance dashboard to report a health score of N/A.

Adım Adım Çözüm

1
Analyze the management channels used by Cisco DNA Center.
Inventory discovery and basic status check rely on SSH (TCP 22) and SNMP (UDP 161), both of which are functioning.
This explains why the switch appears as Reachable in the inventory despite lacking telemetry metrics.
2
Identify the protocol requirements for Cisco DNA Center Assurance telemetry deployment.
Cisco DNA Center configures and subscribes to telemetry metrics on IOS XE switches via NETCONF using TCP port 830.
Model-driven telemetry and telemetry profile provisioning fail if NETCONF communication over TCP port 830 is blocked between the controller and managed devices.
3
Evaluate why alternative causes are incorrect.
Cisco DNA Center is controller-based and agentless, so manual HTTP POST dispatches from switch CLI or Ansible agent containers are inaccurate.
Understanding controller-led agentless workflows isolates port-blocking as the true failure point.

Anahtar Kavram

Cisco DNA Center Assurance and Model-Driven Telemetry Provisioning
Tahmini Süre:2m 30s
Soru 416Soru →

Network automation fundamentally shifts how enterprise networks are deployed, monitored, and maintained compared to traditional management methods. Match each automation capability to its corresponding operational impact on network management.

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Öğeler

Streaming Telemetry (Push Model)
Declarative State Models
Version-Controlled Configuration Repositories
Controller-Based API Orchestration

Eşleşmeler

Cevabı ve açıklamayı göster

Cevap

Streaming Telemetry matches with replacing SNMP polling for real-time metrics; Declarative State Models match with eliminating configuration drift; Version-Controlled Repositories match with providing change auditing and rollbacks; Controller-Based APIs match with replacing per-device CLI provisioning.
Each automation component transforms network operations by moving from manual, reactive, per-device workflows to central, proactive, state-driven paradigms. Streaming telemetry replaces legacy SNMP pull requests with efficient push updates. Declarative models continuously enforce intended state to stop configuration drift. Version control repositories ensure change tracking and rapid rollbacks. API-driven controllers centralize configuration tasks across network fabrics.

Adım Adım Çözüm

1
Analyze monitoring shift
Identify that pushing data continuously (streaming telemetry) replaces polling devices via SNMP.
Traditional network monitoring relies on periodic SNMP GET requests, whereas automated telemetry pushes state changes continuously.
2
Analyze configuration methodology shift
Link declarative state management to automated reconciliation of configuration drift.
Imperative CLI commands describe step-by-step actions, whereas declarative models define the target state so the system can resolve any deviation (drift).
3
Analyze change management shift
Associate Git/version control repositories with auditing and rollback features.
Infrastructure as Code (IaC) principles mandate storing configuration files in version control for tracking, auditing, and fast reversion.
4
Analyze device provisioning shift
Pair API controller management with central abstraction over per-device CLI sessions.
Central software-defined controllers use northbound APIs to automate changes across numerous devices rather than requiring individual SSH/CLI sessions.

Anahtar Kavram

Impact of Automation on Network Management
Soru 417Soru →

Match each network management paradigm with its defining operational impact on enterprise network environments.

Soldaki öğeye tıklayın, sonra eşleşen sağdaki öğeye tıklayın

Öğeler

Model-Driven Streaming Telemetry
Imperative CLI Scripting
Declarative Configuration Management
Centralized Controller API Orchestration

Eşleşmeler

Cevabı ve açıklamayı göster

Cevap

Model-Driven Streaming Telemetry pairs with real-time push data streams over gRPC/NETCONF. Imperative CLI Scripting pairs with rigid step-by-step execution increasing configuration drift risk. Declarative Configuration Management pairs with defining target end-state to audit and enforce consistency. Centralized Controller API Orchestration pairs with translating high-level policy via RESTful interface calls.
Model-Driven Streaming Telemetry provides real-time push telemetry via gRPC/NETCONF; Imperative CLI Scripting executes unvalidated sequential commands risking drift; Declarative Configuration Management defines the target state to enforce continuous compliance; and Centralized Controller API Orchestration uses REST APIs to apply intent-based policies across a fabric.

Adım Adım Çözüm

1
Analyze Model-Driven Streaming Telemetry
Identify that streaming telemetry relies on push-based data subscription models rather than SNMP GET polling queries.
Automation shifts network visibility from reactive SNMP polling intervals to continuous real-time data streaming.
2
Analyze Imperative CLI Scripting
Identify that procedural CLI commands execute line-by-line without state awareness, leading to configuration drift.
Imperative methods specify step-by-step actions without verifying if the underlying state matches expectations.
3
Analyze Declarative Configuration Management
Identify that declarative tools focus on defining the desired end-state using data structures like YAML or JSON.
Declarative engines compare actual state against desired state to maintain system compliance automatically.
4
Analyze Centralized Controller API Orchestration
Identify that SDN controllers abstract physical underlays by exposing REST APIs for intent-based policy enforcement.
Controllers replace per-device management with centralized fabric orchestration via HTTP REST verbs.

Anahtar Kavram

Impact of Automation on Network Management
Soru 418Soru →

A network administrator is executing an automated software upgrade for a cluster of Cisco Catalyst access switches using Cisco DNA Center Software Image Management (SWIM). What is the correct sequence of steps required to complete the complete end-to-end SWIM deployment workflow?

Öğeleri doğru sıraya koymak için sürükleyin

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Cevap

The correct operational order for the Cisco DNA Center Software Image Management (SWIM) workflow is: 1) Upload the software image file into the Cisco DNA Center Image Repository, 2) Designate the software image as Golden for the specific Catalyst switch model family, 3) Initiate the Image Distribution job to copy the binary file to switch flash storage, 4) Run Pre-checks validation to verify system readiness, and 5) Execute the Image Activation job to set boot variables, reboot the device, and run Post-checks.
The Cisco DNA Center SWIM lifecycle follows a strict logical process. First, the installation file is uploaded into the central repository. Next, administrators tag the image as 'Golden' for the targeted switch family to establish compliance baseline. Then, distribution transfers the binary onto the managed switch's local storage. Pre-checks validate storage capacity and configuration state prior to disruption. Finally, activation updates boot parameters, reloads the node into the new release, and executes post-checks to confirm full network recovery.

Adım Adım Çözüm

1
Add the installation binary to the system repository
The target Cisco IOS XE image is stored in Cisco DNA Center Image Repository
Cisco DNA Center cannot manage, evaluate compliance for, or deploy an image that has not been imported into its local repository.
2
Set the Golden Image compliance standard
The image is marked as Golden for the selected device family
Marking an image as Golden defines the standardized baseline operating system version for all devices assigned to that family/role.
3
Distribute the software image to target switches
The image binary file is transferred to local flash memory on the switches
Distribution moves the image onto the device storage in advance so that activation can take place swiftly during a designated maintenance window.
4
Run Pre-upgrade check validations
System checks confirm sufficient disk space, configuration compatibility, and stack stability
Pre-checks prevent failed upgrades by identifying potential issues (such as insufficient flash storage or corrupt configuration statements) before the reboot sequence starts.
5
Activate the image and run Post-checks
Boot configuration is modified, device reboots, and Post-checks confirm healthy status
Activation updates the startup system boot statements and reboots the switch to complete the upgrade, followed by post-check verification to validate operational health.

Anahtar Kavram

Cisco DNA Center Software Image Management (SWIM) Workflow
Soru 419Soru →

An organization transitions its enterprise infrastructure to an automated network management framework utilizing programmatic RESTful APIs and declarative configuration templates. During a routine security audit, network engineers observe that out-of-band configuration changes manually made directly on individual switch command-line interfaces are automatically reverted to the intended state within minutes. Additionally, real-time interface statistics are continuously transmitted to a central analytics engine without requiring polling requests. Which statement accurately describes the core operational impact of this automation model on enterprise network management?

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Cevap: It enforces a single source of truth to eliminate configuration drift across managed nodes while providing continuous, low-overhead operational visibility through push-based telemetry.

Cevap

It enforces a single source of truth to eliminate configuration drift across managed nodes while providing continuous, low-overhead operational visibility through push-based telemetry.
Automated network management shifts operational workflows from per-device manual CLI administration to centralized, code-driven orchestration. Storing device configurations in declarative code repositories establishes a single source of truth, enabling automated controllers to detect and override out-of-band configuration drift. Furthermore, replacing pull-based SNMP requests with push-based streaming telemetry provides granular, real-time operational metrics with lower CPU overhead.

Adım Adım Çözüm

1
Analyze the impact of declarative automation models on device state.
Declarative automation uses a central repository (version control) as the single source of truth, continuously detecting and reconciling out-of-band CLI changes (configuration drift).
Centralized automation enforces consistency and compliance across the fleet automatically.
2
Evaluate the telemetry mechanism described in the scenario.
Real-time continuous transmission of metrics to an analytics engine without polling describes push-based streaming telemetry.
Streaming telemetry reduces CPU overhead and provides near-real-time operational visibility compared to legacy SNMP polling.
3
Synthesize the operational impact on network management.
Combining drift mitigation via a single source of truth with real-time push telemetry represents the primary operational shift from traditional per-device manual CLI operations to automated management.
This alignment satisfies both operational consistency and modern telemetry requirements.

Anahtar Kavram

Impact of Automation on Network Management (Single Source of Truth, Drift Mitigation, and Streaming Telemetry)
Soru 420Soru →

Which Cisco DNA Center feature continuously collects telemetry data from network devices and clients to generate health scores and provide proactive troubleshooting insights?

Cevabı ve açıklamayı göster

Cevap: Cisco DNA Center Assurance

Cevap

Cisco DNA Center Assurance is the core component that aggregates telemetry data to provide health scores and proactive diagnostics for network devices and clients.
Cisco DNA Center Assurance synthesizes streaming telemetry data to evaluate network performance, calculate health scores, and deliver proactive troubleshooting guidance.

Adım Adım Çözüm

1
Analyze the functional requirement presented in the question.
The requirement asks for the Cisco DNA Center subsystem responsible for continuous telemetry collection and health score generation.
Identifying the functional domain distinguishes operational monitoring tools from deployment or provisioning tools.
2
Match the functional requirement with the appropriate Cisco DNA Center pillar.
Assurance is specifically designed to collect network telemetry and render global health scores ranging from 1 to 10 for network elements and client devices.
Assurance provides complete network visibility and predictive analytics.

Anahtar Kavram

Cisco DNA Center Assurance and Telemetry
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