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Question 750
A fabric uses a routed IP underlay and an overlay that identifies isolated tenant segments. A controller needs to map a tenant virtual network to a network identifier used by the encapsulation, rather than change a physical link IP. Which concept identifies that overlay segment?
- An access-port PoE electrical class
- A VLAN-native untagged frame with no tenant encapsulation identifier
- A VXLAN Network Identifier (VNI) associated with the overlay virtual segment
- An interface duplex setting that chooses the Ethernet collision-domain mode
Explanation
Correct Answer
C:The VXLAN VNI names a logical overlay segment independently of the routed IP underlay used to carry the encapsulated traffic.
Incorrect Answers
A:PoE power classes control endpoint electrical delivery and do not identify an encapsulated multi-tenant overlay segment.
B:An untagged local Ethernet frame alone has no VXLAN network identifier for transport across the routed fabric.
D:Ethernet duplex controls physical MAC operation and cannot supply a tenant-wide virtual network identifier in an overlay header.
Question 751
A VXLAN overlay cannot establish tunnels because the physical network lacks reachability between VTEP loopback endpoints. Which base IP transport layer must be repaired first?
- Change the tenant VXLAN VNI without validating IP transport between VTEP addresses
- Restart the fabric control-plane service without checking routed reachability
- Verify underlay IP routes and VTEP-to-VTEP reachability across physical links
- Change client VLAN mapping only, assuming VXLAN encapsulation can traverse missing underlay routes
Explanation
Correct Answer
C:VXLAN packets must traverse the IP underlay between source and destination VTEPs; repairing physical or routed underlay reachability is foundational.
Incorrect Answers
A:Tenant VNI configuration controls logical segmentation, but a valid overlay cannot deliver encapsulated traffic when the remote VTEP IP is unreachable.
B:Control-plane restart does not replace the missing Layer 3 path between tunnel endpoints and can disrupt healthy fabric control state.
D:Client VLAN settings do not manufacture the IP route needed to transport VXLAN outer packets between VTEP loopbacks.
Question 752
VTEP IP connectivity is healthy, but tenants cannot communicate because the required VNIs and logical overlay segments are not correctly defined. Which virtual-network definitions should be verified?
- Rebuild the routed underlay even though verified VTEP-to-VTEP IP reachability is healthy
- Verify tenant virtual-network/VNI definitions and the relevant endpoint segment mappings
- Increase physical interface speed without inspecting overlay or VNI configuration
- Change the controller user-login credentials to modify the tenant VNI mappings
Explanation
Correct Answer
B:VNIs and endpoint-to-VN bindings define overlay tenant segmentation; errors there prevent valid traffic despite a healthy underlay.
Incorrect Answers
A:The supplied evidence already establishes the underlay IP path, so recreating that path does not address missing logical tenant mappings.
C:Link bandwidth affects capacity but does not assign missing VXLAN VNIs or logical tenant segments.
D:Controller administrator credentials govern access to management, not the already-identified faulty VN and VNI definitions.
Question 753
A controller reports a policy change as committed, but a managed switch has not received the corresponding programmed state. Which controller-to-device control interface state must be checked?
- Inspect controller-to-device southbound policy/programming status and switch-side installed state
- Assume an accepted northbound API response guarantees every switch has installed the change
- Change the overlay VNI IDs without confirming whether controller policy was delivered
- Verify only the workstation’s IP gateway despite evidence that controller-to-switch sync is missing
Explanation
Correct Answer
A:When a change is committed centrally but absent on a switch, compare southbound delivery, device acknowledgments and device operational state.
Incorrect Answers
B:A successful application-facing request confirms acceptance at one layer, not completion of southbound deployment to every device.
C:Blind VNI changes can introduce new segmentation faults and do not isolate missing southbound programming state.
D:A client gateway check measures forwarding symptoms but does not prove the device received the controller’s policy change.
Question 754
An orchestration script calls Catalyst Center APIs but receives unexpected HTTP errors despite healthy physical links. Which application-facing controller API response should be examined?
- Inspect unrelated IP route metrics on the underlay, although the API response itself fails
- Reconfigure fabric switch port speeds without reading the orchestration error
- Disable overlay segmentation while preserving the same invalid REST request
- Inspect the northbound API status code, endpoint, request body and response error
Explanation
Correct Answer
D:The northbound API response and request details show application-facing rejection conditions despite healthy underlying physical connectivity.
Incorrect Answers
A:Underlay metrics do not explain whether the northbound endpoint rejected an HTTP request due to input, authentication or endpoint errors.
B:Link rate has no necessary connection to an application API status and should not be changed without diagnostic evidence.
C:Disabling segmentation does not correct a malformed API call and can disrupt unrelated tenant isolation.
Question 755
Overlay definitions and underlay routes both appear correct, but endpoint packets still fail to traverse the switch. Which actual data-plane path verification distinguishes forwarding failure from controller configuration state?
- Treat an all-green GUI topology view as proof every application packet crosses all fabric switches
- Test actual endpoint-to-endpoint forwarding and relevant device data-plane counters or paths
- Change VNI configuration before testing whether packets are dropped at a specific hop
- Infer success from the existence of a controller configuration object alone
Explanation
Correct Answer
B:With underlay and overlay intent apparently sound, packet-level connectivity tests and relevant forwarding evidence can locate the remaining data-plane fault.
Incorrect Answers
A:A management GUI can reflect intended or partially converged state; it cannot by itself prove that real packets traverse the forwarding hardware.
C:Changing logical segmentation without evidence may create new faults and does not distinguish forwarding failure from controller-state errors.
D:Configuration objects describe intent but do not certify actual packet delivery through switch ASICs and interfaces.
Question 756
A network operator has two years of uplink-utilization telemetry and wants a forecast of when a circuit may exceed 90% capacity. Which predictive modeling technique uses the historical traffic trend?
- Use a one-time interface status snapshot without historical features
- Use only deterministic static IPv4 subnet math to predict circuit saturation
- Use predictive ML on traffic trends
- Use a generative text summary without time-series data or model validation
Explanation
Correct Answer
C:Predictive ML models learn historical utilization patterns and can estimate future congestion or capacity trends. Operators must validate data quality and forecast uncertainty before using a model to justify provisioning.
Incorrect Answers
A:One administrative/operational state cannot forecast when a sustained traffic threshold will be exceeded.
B:Address range arithmetic cannot infer future utilization trends from two years of measurements.
D:Narrative output alone does not estimate the future 90% threshold crossing from telemetry history.
Question 757
A network-support AI assistant proposes an IOS CLI fix, but older model training could invent an unsupported command. Before accepting its response, which evidence-grounding workflow best limits unsupported technical claims?
- Trust any CLI string the assistant emits because its wording is confident
- Retrieve current device configuration and relevant verified Cisco documentation, cite the evidence, and require operator verification
- Treat the CCNA exam blueprint as proof of exact IOS XE command availability
- Apply the command directly on production with no backup or operator verification
Explanation
Correct Answer
B:The assistant should consult the current device state and version-specific Cisco command documentation, show evidence for the suggested CLI, and have an operator validate it before use. Grounding reduces plausible but unsupported command hallucinations.
Incorrect Answers
A:A language model can hallucinate platform commands or parameters; confidence is not device/version evidence.
C:The syllabus defines tested concepts, not whether a particular device/version accepts the proposed CLI.
D:Unvalidated production execution risks outage and fails the specified evidence-grounded change-control requirement.
Question 758
A NOC has six months of per-interface error rates, latency and link utilization. It wants to flag new behavior far outside a learned normal baseline even when no fixed threshold was specified. Which technique fits?
- Anomaly detection comparing current telemetry with a learned baseline
- A generative language model asked to invent a numerical error threshold without telemetry
- A single fixed ACL that drops all IP traffic with source addresses outside one subnet
- A static STP root priority change made independently of observed interface metrics
Explanation
Correct Answer
A:Anomaly detection can learn normal metric distributions and highlight departures; operations should validate alerts against actual faults and baseline shifts.
Incorrect Answers
B:Generating an unsupported threshold from prose does not supply the observed statistical baseline needed for network anomaly detection.
C:An ACL enforces packet forwarding policy rather than assessing time-series interface behavior against historical patterns.
D:STP root priority influences Layer 2 topology selection, not predictive monitoring of link error metrics.
Question 759
An AI assistant proposes shutting down three trunk ports to resolve an intermittent VLAN loop, but its explanation includes no verified topology. The organization requires human authorization before modifying production. What is the correct workflow?
- Execute the proposed shutdown commands automatically because a model supplied them
- Require operator review of actual topology and an approved change or test gate before deployment
- Disable the configuration backup system so the assistant can run faster
- Skip validation when the model expresses high confidence in the diagnosis
Explanation
Correct Answer
B:The engineer must compare the recommendation with live STP and topology evidence, then authorize and test the proposed configuration under change controls.
Incorrect Answers
A:An unsupported model suggestion can sever production connectivity; model output alone is not evidence the identified ports are safe to disable.
C:Backups protect recoverability and have no causal relationship with validating the proposed STP diagnosis before a shutdown.
D:A model’s expressed certainty is not a substitute for independent network measurements or accountable approval.
Question 760
A network ML model correctly classified link congestion before a campus redesign. After a new WAN transport and QoS policy are introduced, false-positive alerts increase sharply. Which maintenance action addresses this change?
- Continue using the original training distribution indefinitely because all models self-correct
- Measure performance on current labeled events and retrain or recalibrate when the observed distribution has shifted
- Replace the observed incident labels with synthetic examples generated by the same model alone
- Disable the syslog collector and treat missing alerts as proof that the model improved
Explanation
Correct Answer
B:Monitoring live accuracy and drift against verified outcomes reveals whether the model needs refreshed labels, thresholds or retraining.
Incorrect Answers
A:Concept drift can alter the relationship between metrics and incidents, so previously acceptable model parameters may become unreliable.
C:Self-generated unverified labels can reinforce existing errors rather than restore alignment with the changed network conditions.
D:Suppressing syslog and telemetry evidence conceals possible failures, leaving no verified labeled outcomes to demonstrate restored model accuracy.
Cisco Certified Network Associate (CCNA) (200-301) Practice Tests
