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Cisco 200-301 Bundle

Exam Code: 200-301

Exam Name Cisco Certified Network Associate (CCNA)

Certification Provider: Cisco

Corresponding Certification: CCNA

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Cisco 200-301 Practice Test 57

Question 560

A controller fails but a switch continues forwarding packets using tables last programmed before the outage. Which separation is demonstrated?

  1. The switch data plane operates locally on installed forwarding state, while central control updates are unavailable.
  2. The switch no longer uses any forwarding state after controller loss.
  3. The controller remains physically in every data-packet path even while powered off.
  4. An NTP clock causes packets to route without device hardware.

Explanation

Correct Answer

A:

Forwarding hardware can continue matching packets against existing programmed tables even when management-plane connectivity is temporarily lost. New policy or topology changes may not be applied until the controller recovers, depending on the platform. This illustrates separation of control and data functions rather than a universal zero-impact failure claim.

Incorrect Answers

B:

The observed continued delivery implies the switch still has usable local forwarding entries. Removing all state would not explain this behavior.

C:

A powered-off controller cannot forward every user packet in this scenario. The distributed dataplane explains continuity.

D:

Time synchronization cannot replace switching ASICs or forwarding tables. Local dataplane state is responsible.

Question 561

An engineer compares overlay and underlay troubleshooting. Physical interface neighbors and their routing adjacencies are healthy, but one tenant virtual segment cannot reach another VTEP. Which layer should be checked next?

  1. Delete the switch routing table to force overlay discovery.
  2. The overlay endpoint configuration, encapsulation identifiers and tenant policy.
  3. Disable VLAN segmentation for all tenants.
  4. Replace every spine fiber optic module regardless of counters.

Explanation

Correct Answer

B:

When underlay transport is demonstrably healthy, a tenant-specific virtual network failure can arise from incorrect overlay mapping, endpoint state or allowed segmentation policy. The logical network has its own control information above the physical IP fabric. Diagnosing those values is more targeted than repeatedly replacing healthy cables.

Incorrect Answers

A:

Overlay endpoints require underlay connectivity, so deleting routes would worsen the problem. Review logical tunnel configuration.

C:

Removing isolation is not a safe repair of one tenant’s missing overlay mapping. The policy and encapsulation should be corrected specifically.

D:

The physical underlay has valid adjacency and link health, so indiscriminate media replacement is not grounded in the selective overlay failure.

Question 562

An application sends a REST call to a network controller to request a new service policy. In SDN terminology, which interface direction does this represent?

  1. A southbound device-control API from controller to switch.
  2. A northbound API from an application or orchestration layer to the controller.
  3. A data-plane forwarding decision made by an endpoint default gateway.
  4. A Layer 2 CDP advertisement between neighboring switches.

Explanation

Correct Answer

B:

Northbound interfaces let higher-level applications express network intent, retrieve state or request services from a controller. The controller may then translate that intent into device configurations using other interfaces. The REST call is management/control communication rather than an Ethernet frame forwarded along the user dataplane.

Incorrect Answers

A:

Southbound interactions occur between the controller and managed infrastructure. The scenario’s request originates from a higher-level application.

C:

Packet forwarding selects a next hop for data traffic; the described REST call requests control-plane policy through an API.

D:

CDP is local neighbor discovery and does not carry application service intent to a controller. It is not a northbound REST request.

Question 563

A controller translates enterprise policy into a series of device-specific CLI commands and API calls. Where should authorization of those changes be enforced?

  1. By making every device accept anonymous Telnet sessions.
  2. By relying on IP subnet masks as user role definitions.
  3. At the controller/orchestration identity and the managed device management interfaces.
  4. Only by assigning a public SSID name to the controller.

Explanation

Correct Answer

C:

Centralized intent must be converted into authorized device operations; both the automation client and each target device need appropriate identity and permissions. Audit logging and secure management transport protect the control plane. Controller presence does not authorize arbitrary changes to every network resource by default.

Incorrect Answers

A:

Anonymous unencrypted management increases risk and is unnecessary for controller integration. Use secure authenticated device control.

B:

Address prefixes can constrain reachability but do not provide comprehensive authorization for specific configuration operations.

D:

An SSID labels wireless service and cannot grant or restrict device-management API privileges. Proper AAA and role policy are required.

Question 564

A tenant network uses tunnel endpoints at leaf switches to carry virtual network packets across a routed spine fabric. What must be true for basic overlay reachability?

  1. Every tenant must share one physical VLAN without encapsulation.
  2. DNS A records replace tunnel endpoint IP connectivity.
  3. The underlay must route between tunnel endpoints and support the encapsulated packet size.
  4. All physical IP routes may be deleted once overlay tunnels are configured.

Explanation

Correct Answer

C:

Overlay tunnels rely on IP transport among their endpoints. Even perfect tenant policy cannot carry an encapsulated frame if the underlay has no route or drops packets because of MTU constraints. Verify physical interface state, underlay routes and encapsulation overhead as part of the service design.

Incorrect Answers

A:

That removes the logical isolation the overlay design provides. Shared underlay transport can carry separate overlays through encapsulation.

B:

Name resolution can identify services but does not carry encapsulated traffic between unreachable tunnel endpoints.

D:

Overlay tunnel packets still travel through the physical routed network. Removing underlay reachability prevents endpoints communicating.

Question 565

A Cisco network automation system separates a centralized controller’s policy computation from hardware switches that forward packets at line rate. Which SDN principle is demonstrated?

  1. A guarantee that every packet must pass through a central controller CPU.
  2. A change of IPv4 mask length whenever policies change.
  3. Complete removal of hardware forwarding in favor of a DNS server.
  4. Logical separation of control-plane decisions from distributed data-plane forwarding.

Explanation

Correct Answer

D:

Control-plane software determines or programs network behavior, while devices execute forwarding actions using their dataplane tables and hardware. This separation supports centralized policy and consistent automation. It does not mean routing and switching cease to exist on the devices; they still enforce programmed state.

Incorrect Answers

A:

Controller-based management can use distributed forwarding tables, so a central CPU is not necessarily the data path for every user packet.

B:

Prefix lengths describe IP routing scope but do not express the software separation between control decisions and packet execution.

C:

DNS resolves names and is not a substitute for packet forwarding hardware. Separating planes does not replace the dataplane.

Question 566

A data-center fabric uses routed physical links between leaf and spine switches, with separate logical networks encapsulated over those links. Which portion is the underlay?

  1. The physical IP transport and routing fabric that carries encapsulated overlay packets.
  2. The controller’s web login name.
  3. The tenant-specific virtual tunnel network built over the physical fabric.
  4. The application server DNS search suffix.

Explanation

Correct Answer

A:

An underlay supplies basic connectivity among network devices, often using IP routing over physical links. Overlay tunnels depend on that reachability and create logical segmentation above it. Debugging overlay failures often begins by verifying that underlay next-hop and MTU behavior can carry the encapsulated packets.

Incorrect Answers

B:

A management username is unrelated to the physical routed fabric used to carry data packets. It cannot function as an underlay.

C:

That describes the overlay, not the underlay. It relies on the transport reachability provided below it.

D:

DNS resolution may support services but does not define routed spine/leaf transport. The underlay is a network connectivity layer.

Question 567

An SDN deployment exposes a central API to an internal business portal and a separate API to hardware switches. The portal asks for network intent while the switches receive configuration. Which mapping is correct?

  1. Portal-to-controller is northbound; controller-to-device configuration is southbound.
  2. Both interactions are always data-plane packet forwarding.
  3. Both interfaces must use CDP instead of any application API.
  4. Portal-to-controller is southbound; controller-to-device is northbound.

Explanation

Correct Answer

A:

Northbound APIs let applications and orchestration layers express goals or read network state. Southbound interfaces carry controller instructions to network devices. The labels describe logical direction in the architecture rather than the packet’s physical north/south travel on a map.

Incorrect Answers

B:

APIs for intent and configuration operate in management/control, not necessarily the path used by user traffic. They program or observe forwarding behavior.

C:

CDP is local link discovery and does not generally express application intent or remote device configuration transactions. The scenario explicitly has APIs.

D:

This reverses the logical roles: applications sit above the controller and devices below it. The directions are defined by control relationships.

Question 568

An engineer asks a generative AI assistant to draft Cisco IOS XE switch configuration for a planned VLAN change. Production policy requires peer review and change approval. Which use is appropriate?

  1. Treat generated commands as a draft, validate syntax and effects against current Cisco documentation, and obtain the required change approval before applying them.
  2. Replace the scheduled VLAN change with a random configuration to maximize generated command diversity.
  3. Allow the assistant to push any generated commands directly to production because generation guarantees device correctness.
  4. Use the text generator as the sole authoritative source for supported CLI commands, ignoring platform releases.

Explanation

Correct Answer

A:

Generative AI can help formulate a configuration and explain candidate commands, but its output is not a trusted device state or an authorization decision. The engineer should verify supported platform/version syntax, intended trunk/access effects and rollback steps in a safe test. Only an approved operator or controlled automation should deploy the checked change.

Incorrect Answers

B:

Randomized production settings have no relationship to the requested network segmentation. They can disrupt traffic rather than reliably implement the approved policy.

C:

Language-model output may contain invalid or unsafe commands, and production access is a separate permission boundary. Bypassing review breaks the explicit change-control requirement.

D:

A language model may synthesize outdated syntax from training material. The correct platform and IOS XE documentation plus operational testing are still required.

Question 569

A network operations team trains a model on six months of interface utilization and plans to alert when a core uplink begins showing behavior unlike its normal busy-hour pattern. What type of application best describes this?

  1. Predictive or anomaly-detection machine learning using historical telemetry baselines.
  2. Use generative AI to invent a replacement utilization series and treat it as measured telemetry.
  3. Disable all utilization collection and rely on the model to predict counters without input.
  4. Configure static DNS records for interface names and assume they identify abnormal traffic patterns.

Explanation

Correct Answer

A:

An ML system can learn normal interface behavior from time-series utilization and flag significant deviations or trends before thresholds become critical. It must be tested against representative busy hours and seasonal changes, not treated as guaranteed fault diagnosis. The operations team should investigate model findings alongside actual interface counters and alarms.

Incorrect Answers

B:

Generative models can synthesize examples, but generated values are not measurements from the physical uplink. Replacing raw counters would hide the anomaly rather than detect it.

C:

Telemetry is the evidence needed to train and score an anomaly model. With collection disabled, the model lacks fresh observations to compare against its baseline.

D:

DNS naming helps resolve identifiers but does not evaluate time-series behavior. It cannot substitute for historical feature learning or anomaly scoring.

Question 570

An engineer trains an ML model to forecast interface congestion and reports 99% accuracy by testing on the same time windows used for training. What is the primary concern?

  1. The model must be correct because the training data was collected from production interfaces.
  2. No evaluation is needed if the interface has a known device hostname.
  3. Only model file size determines whether congestion forecasts will be accurate.
  4. Training-set evaluation can overestimate generalization; validate on held-out time periods with representative traffic conditions.

Explanation

Correct Answer

D:

An ML model can memorize particular training patterns without predicting a later traffic surge reliably. A separated evaluation period better tests performance on unseen load and helps identify leakage from future observations. The engineer should compare useful forecast metrics and operational consequences rather than citing in-sample accuracy alone.

Incorrect Answers

A:

Production-origin data can still be overfit. Authentic measurements do not replace an independent evaluation period.

B:

Names identify devices but do not establish forecast reliability. A held-out time period and real congestion outcomes are the needed test.

C:

Disk size and parameter count do not demonstrate predictive generalization. The case requires measuring unseen traffic outcomes.