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Question 430
IP phones and cameras are scheduled for a new closet, but PoE budget is calculated only from the switch's total port count. Which observed result would most directly prove the design meets the intended goal?
- All approved powered endpoints boot under full load and stay powered after one permitted PSU failure.
- Only the approved number of endpoint identities can use the port while rogue downstream devices are blocked.
- The authorized bridge participates without disabling BPDU protection for unrelated endpoint ports.
- The rogue bridge cannot become campus root and protected access interfaces enter their intended security state.
Explanation
Correct Answer
A:Calculate worst-case powered-device class demand, switch power supply budget, and redundancy headroom. Verify the resulting network behavior rather than relying only on the saved configuration.
Incorrect Answers
B:This observation relates to a different topology: A guest workstation port can learn hundreds of source MAC addresses because an unmanaged mini-switch is connected behind it. It does not verify the present outcome.
C:This observation relates to a different topology: An access switch's BPDU Guard disables a legitimate downstream bridge, and the network team proposes disabling Guard on every port. It does not verify the present outcome.
D:This observation relates to a different topology: An attacker plugs an unmanaged switch into a lobby edge port and advertises superior STP BPDUs, changing the root topology. It does not verify the present outcome.
Question 431
New routers have valid IP addresses but IS-IS peers in separate areas never form a level-1 adjacency. Which observed result would most directly prove the design meets the intended goal?
- Clients reach the headquarters destination over the routed path using the approved office prefix.
- Route reachability between distant IS-IS areas is present through level-2 adjacencies.
- Normal forwarding prefers the main path while failover selects the backup when primary reachability disappears.
- The intended adjacency comes up at the correct level and interarea destinations remain reachable.
Explanation
Correct Answer
D:Align IS-IS area addresses for L1 neighbor formation or use supported level-2 adjacency where the topology requires interarea routing. Verify the resulting network behavior rather than relying only on the saved configuration.
Incorrect Answers
A:This observation relates to a different topology: A remote office assigns clients addresses from 169.254.0.0/16 and expects them to be reachable through a routed WAN. It does not verify the present outcome.
B:This observation relates to a different topology: A service provider backbone runs IS-IS level-1 only across multiple areas, and distant branch routers cannot obtain interarea routes. It does not verify the present outcome.
C:This observation relates to a different topology: A network uses IS-IS with dual distribution routers and wants predictable traffic away from a low-bandwidth backup path. It does not verify the present outcome.
Question 432
Network management of a branch uses a VPN over its sole primary WAN, and the organization reports no way to diagnose a provider outage. Which observed result would most directly prove the design meets the intended goal?
- Backup traffic stays within the 20-Mbps service rate and critical classes remain usable.
- Guest routing tables contain no unauthorized management loopback routes.
- A WAN outage still produces actionable diagnostics and authorized operator access.
- Telemetry remains within service capacity and operators can still reach consoles under load.
Explanation
Correct Answer
C:Provide independent telemetry or out-of-band access appropriate to site criticality and budget. Verify the resulting network behavior rather than relying only on the saved configuration.
Incorrect Answers
A:This observation relates to a different topology: A 20-Mbps backup link replaces a 200-Mbps primary WAN but the shaper keeps its 200-Mbps limit after failover. It does not verify the present outcome.
B:This observation relates to a different topology: A campus firewall isolates management VRFs but its shared-services route leaking exports all loopbacks to the guest VRF. It does not verify the present outcome.
D:This observation relates to a different topology: A provider's remote OOB management path is only 2 Mbps, while the network team sends continuous uncompressed telemetry streams at 5 Mbps. It does not verify the present outcome.
Question 433
A lab requires a routed overlay carrying multicast between sites but encryption is not part of the GRE service itself. Which observed result would most directly prove the design meets the intended goal?
- Enterprise routers form intended routing neighbors over the circuit while provider internals remain hidden.
- Multicast protocol control and user traffic traverse the overlay while mandated encryption tests also pass where enabled.
- Only authorized multicast receivers on selected sites receive the required production feed.
- Voice sessions remain inside the approved quality budget over the constrained backup link.
Explanation
Correct Answer
B:Use GRE for appropriate multiprotocol encapsulation and add IPsec separately if confidentiality is required. Verify the resulting network behavior rather than relying only on the saved configuration.
Incorrect Answers
A:This observation relates to a different topology: A financial organization leases a transparent point-to-point Ethernet service but requires independent routing at each site. It does not verify the present outcome.
C:This observation relates to a different topology: A manufacturing WAN requires multicast distribution but the SD-WAN overlay has only validated unicast OMP reachability. It does not verify the present outcome.
D:This observation relates to a different topology: A branch has broadband backup with no QoS controls and a voice service drops under failover saturation. It does not verify the present outcome.
Question 434
A standards group needs an interoperable interface model but mistakenly calls every IETF YANG module an OpenConfig model. Which observed result would most directly prove the design meets the intended goal?
- The controller successfully reads and writes only the supported wireless policy nodes on target devices.
- Collector time series captures the brief spikes with timestamped relevant YANG measurements.
- Schema registry entries identify the correct module namespace and revisions for each controller operation.
- A controlled status change reaches the collector promptly without waiting for the next periodic poll.
Explanation
Correct Answer
C:Distinguish IETF standards-track models from OpenConfig community models and vendor-native schema ownership. Verify the resulting network behavior rather than relying only on the saved configuration.
Incorrect Answers
A:This observation relates to a different topology: A Cisco-only controller needs platform-specific wireless policies that are not represented by the organization's standard OpenConfig model. It does not verify the present outcome.
B:This observation relates to a different topology: An NOC polls every router with SNMP once every ten minutes and misses 30-second interface utilization spikes. It does not verify the present outcome.
D:This observation relates to a different topology: An alerting system needs immediate notice of interface administrative status changes but only polls every five minutes. It does not verify the present outcome.
Question 435
Fabric edge nodes encapsulate packets, but the underlay path MTU is too small for added VXLAN overhead. Which observed result would most directly prove the design meets the intended goal?
- Encapsulated end-to-end test packets pass between fabric edges without fragmentation blackholes.
- A moved endpoint retains its intended policy and access to only approved destinations.
- The fabric edge is inventoried, assigned its intended role, and passes overlay endpoint traffic tests.
- Underlay nodes reach fabric RLOCs while user endpoints are mapped and forwarded through the correct overlay VN.
Explanation
Correct Answer
A:Size the entire routed underlay MTU for supported encapsulated payloads rather than only endpoint Ethernet frames. Verify the resulting network behavior rather than relying only on the saved configuration.
Incorrect Answers
B:This observation relates to a different topology: Users roam between wired fabric edge switches but their identity assignments change with switch port, breaking microsegmentation. It does not verify the present outcome.
C:This observation relates to a different topology: A new fabric edge is reachable over IP, yet Catalyst Center shows its inventory and provisioning state incomplete. It does not verify the present outcome.
D:This observation relates to a different topology: In a planned SD-Access fabric, border nodes can reach edge loopbacks but endpoints fail because the team placed user subnets into the underlay instead of overlay VRFs. It does not verify the present outcome.
Question 436
A BGP operator attempts to influence routes within one AS by changing the weight attribute only on one edge router. Which observed result would most directly prove the design meets the intended goal?
- The intended exit preference propagates across internal BGP speakers.
- The accepted RIB contains the permitted default and no unintended provider prefixes.
- Hubs avoid querying through the branch as a transit path and branch-local prefixes remain visible.
- Bidirectional test prefixes appear once with predictable origin and no repeated reimport after failover.
Explanation
Correct Answer
A:Use local preference or another AS-wide BGP policy rather than relying on locally significant weight. Verify the resulting network behavior rather than relying only on the saved configuration.
Incorrect Answers
B:This observation relates to a different topology: An edge router receives a full BGP table where the security policy allows only the provider's approved default. It does not verify the present outcome.
C:This observation relates to a different topology: A branch EIGRP router advertises remote routes back into its hub and occasionally becomes a transit path between hubs. It does not verify the present outcome.
D:This observation relates to a different topology: Branch A and B redistribute external BGP into OSPF, then advertise resulting routes back into BGP at the opposite edge. It does not verify the present outcome.
Question 437
A network team manually builds static IPsec tunnels between every SD-WAN edge even though centralized overlay policy is available. Which observed result would most directly prove the design meets the intended goal?
- Authorized overlay tunnels form between intended peers without manually maintained full-mesh IKE policy.
- Approved endpoints encrypt traffic while retaining the provider's intended any-to-any routing paths.
- Large application sessions succeed with correct effective packet sizing over each approved transport.
- Route/session counts stay within supported platform bounds and new branches join without control-plane exhaustion.
Explanation
Correct Answer
A:Use the SD-WAN control-plane and key distribution capabilities appropriate to the supported solution. Verify the resulting network behavior rather than relying only on the saved configuration.
Incorrect Answers
B:This observation relates to a different topology: An organization needs any-to-any group-encrypted private WAN traffic but the new design proposes a traditional hub-and-spoke IPsec overlay with hub hairpins. It does not verify the present outcome.
C:This observation relates to a different topology: A branch uses IPsec overlay on broadband with 1400-byte effective MTU, but an application sends 1500-byte DF-set packets and stalls. It does not verify the present outcome.
D:This observation relates to a different topology: A WAN edge has hundreds of VPN prefixes and growing TLOC paths; an all-to-all overlay approaches its platform session capacity. It does not verify the present outcome.
Question 438
A QoS controller marks all backup data DSCP AF41 while the provider honors it as a premium video class. Which observed result would most directly prove the design meets the intended goal?
- Telemetry remains within service capacity and operators can still reach consoles under load.
- Backup operations continue at lower priority without violating interactive video quality.
- Packet captures across both sites show correct class markings before and after provider handoff.
- End-to-end packet captures and performance tests show the intended DSCP mapping and queue treatment.
Explanation
Correct Answer
B:Remap backup traffic to a less-preferred class and protect media queues for their intended applications. Verify the resulting network behavior rather than relying only on the saved configuration.
Incorrect Answers
A:This observation relates to a different topology: A provider's remote OOB management path is only 2 Mbps, while the network team sends continuous uncompressed telemetry streams at 5 Mbps. It does not verify the present outcome.
C:This observation relates to a different topology: Two sites use different DSCP mappings for the same video stream and one class is downgraded at the carrier boundary. It does not verify the present outcome.
D:This observation relates to a different topology: A network architect assumes assigning DSCP CS6 to user browsing guarantees faster internet service from a provider that resets all DSCP. It does not verify the present outcome.
Question 439
Two intercampus routers redistribute OSPF and EIGRP in both directions, making route origin hard to track. Which observed result would most directly prove the design meets the intended goal?
- A representative prefix crosses the boundary once and retains deterministic return routing.
- Intercampus traffic follows authorized shortest feasible paths rather than unwanted data-center detours.
- A failed path is withdrawn quickly enough that active voice sessions remain within the specified interruption budget.
- Both failure exercises satisfy the documented outage budget without skipping required policy checks.
Explanation
Correct Answer
A:Apply selective redistribution, tagging and route filtering at clearly defined protocol boundaries. Verify the resulting network behavior rather than relying only on the saved configuration.
Incorrect Answers
B:This observation relates to a different topology: A branch aggregation point has both IS-IS and OSPF neighbors with multiple equal-cost exits; traffic unexpectedly hairpins through a data center. It does not verify the present outcome.
C:This observation relates to a different topology: Campus routers detect a fiber break only after long OSPF dead timers, missing a strict voice recovery target. It does not verify the present outcome.
D:This observation relates to a different topology: A new campus design requires maintaining service during both one uplink failure and one planned software upgrade. It does not verify the present outcome.
Question 440
A retailer adds 70 branches and reused 10.20.0.0/16 at several sites; the MPLS provider cannot distinguish the overlapping prefixes in the enterprise routing table. Which observed result would most directly prove the design meets the intended goal?
- All advertised LAN /64s are distinct and can be summarized within the delegated /48 where topology permits.
- Each site advertises unique prefixes and the regional summarization boundary routes traffic to the correct branch.
- Route reachability between distant IS-IS areas is present through level-2 adjacencies.
- The accepted RIB contains the permitted default and no unintended provider prefixes.
Explanation
Correct Answer
B:Allocate nonoverlapping hierarchical IPv4 blocks by region and site, reserving summary boundaries and documenting any unavoidable VRF isolation. Verify the resulting network behavior rather than relying only on the saved configuration.
Incorrect Answers
A:This observation would validate a different case: A provider delegation contains 2001:db8:4200::/48 and the design requires 256 independent /64 LANs across 16 branches. It does not establish the target outcome for this topology.
C:This observation relates to a different topology: A service provider backbone runs IS-IS level-1 only across multiple areas, and distant branch routers cannot obtain interarea routes. It does not verify the present outcome.
D:This observation relates to a different topology: An edge router receives a full BGP table where the security policy allows only the provider's approved default. It does not verify the present outcome.
Designing Cisco Enterprise Networks (ENSLD) (300-420) Practice Tests
