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Question 310
A multicampus network has two equal-cost paths but the design assumes packets always alternate evenly across every individual packet. Which observed result would most directly prove the design meets the intended goal?
- Representative flows distribute across eligible next hops while a single ordered flow remains stable.
- Both routed uplinks forward to the rest of campus and a link failure reroutes traffic without a campus STP event.
- Intercampus traffic follows authorized shortest feasible paths rather than unwanted data-center detours.
- Control-plane endpoint mappings resolve and separate packet captures show VXLAN data forwarding between fabric edges.
Explanation
Correct Answer
A:Plan ECMP based on actual per-flow hashing and application sensitivity rather than guaranteed per-packet load balance. Verify the resulting network behavior rather than relying only on the saved configuration.
Incorrect Answers
B:This observation relates to a different topology: A routed-access campus needs equal-cost forwarding to two distribution routers while keeping each VLAN local to one wiring closet. It does not verify the present outcome.
C: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.
D:This observation relates to a different topology: An SD-Access architect assumes the fabric's LISP control plane transports all user packets like a data-plane tunnel. It does not verify the present outcome.
Question 311
During a branch expansion, the address plan fills every usable subnet identifier and leaves no room for point-to-point links or future aggregation. Which observed result would most directly prove the design meets the intended goal?
- Branch routes remain reachable through the surviving aggregation router after failure.
- The IPv6 client resolves and accesses the approved IPv4 service without adopting IPv4 on the client.
- Only intended branches learn the approved default source and backup behavior.
- New links and sites receive nonoverlapping prefixes without renumbering established regional summaries.
Explanation
Correct Answer
D:Reserve infrastructure and growth ranges separately within a hierarchical IPv4 and IPv6 allocation plan. Verify the resulting network behavior rather than relying only on the saved configuration.
Incorrect Answers
A:This observation relates to a different topology: An EIGRP deployment relies on a single aggregation router and an outage cuts off all downstream branches. It does not verify the present outcome.
B:This observation relates to a different topology: A new IPv6-only client subnet must access a legacy IPv4-only web endpoint through an enterprise gateway. It does not verify the present outcome.
C:This observation relates to a different topology: A branch engineer redistributes a static default route into EIGRP and advertises it to every site, overriding the intended hub defaults. It does not verify the present outcome.
Question 312
A hospital uses one leased WAN circuit for critical access, but its architecture report calls the site highly available because it has two LAN switches. Which observed result would most directly prove the design meets the intended goal?
- The branch reaches core services after failure of the original carrier handoff.
- The branch switches to the secondary circuit within the required service recovery interval.
- Large application sessions succeed with correct effective packet sizing over each approved transport.
- Guest prefixes and traffic stay isolated from production routes and data tunnels.
Explanation
Correct Answer
A:Add genuinely diverse WAN transport and edge device options consistent with the recovery requirement. Verify the resulting network behavior rather than relying only on the saved configuration.
Incorrect Answers
B:This observation relates to a different topology: An enterprise's primary WAN circuit fails but BGP route withdrawal is delayed while the underlay interface remains up. 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: An SD-WAN fabric routes guest traffic into the production VPN because a new edge reused the corporate service VPN identifier. It does not verify the present outcome.
Question 313
A fleet telemetry design streams all available operational leaves every second over a constrained management link. Which observed result would most directly prove the design meets the intended goal?
- Subscription updates decode into typed intended metrics and preserve their source paths.
- The receiver obtains the expected measurement updates for every required signal.
- Data volumes fall while five-minute trend accuracy still meets planning requirements.
- The collector receives actionable measurements without saturating management transport or device CPU.
Explanation
Correct Answer
D:Subscribe only to required model paths with appropriate update mode and cadence. Verify the resulting network behavior rather than relying only on the saved configuration.
Incorrect Answers
A:This observation relates to a different topology: A telemetry receiver supports gRPC but cannot decode the device's gNMI JSON_IETF path data and classifies every update as malformed. It does not verify the present outcome.
B:This observation relates to a different topology: A routing telemetry client assumes every operational counter supports on-change updates and receives no updates on one platform. It does not verify the present outcome.
C:This observation relates to a different topology: A global WAN telemetry system publishes a complete 10,000-interface snapshot every 100 ms although the target is only five-minute capacity planning. It does not verify the present outcome.
Question 314
A core router's production data plane fails, leaving SSH reachable only through the same failed core path. Which observed result would most directly prove the design meets the intended goal?
- Authorized emergency operators can administer devices when primary campus routing and AAA are down.
- Operators can reach device management after production routing is intentionally removed.
- The chosen design meets critical-flow service expectations without unsupportable per-flow state on core devices.
- Packets arriving on incorrect RPF interfaces are rejected and legitimate receiver traffic passes.
Explanation
Correct Answer
B:Provide an independently reachable out-of-band management network and approved emergency access process. Verify the resulting network behavior rather than relying only on the saved configuration.
Incorrect Answers
A:This observation relates to a different topology: A campus has out-of-band console servers but all consoles depend on the production AAA server reachable only over the failed production network. It does not verify the present outcome.
C:This observation relates to a different topology: A hospital asks for guaranteed per-flow service across 300 branches and considers IntServ RSVP state on every core router. It does not verify the present outcome.
D:This observation relates to a different topology: A multicast source is reachable through an interface other than the one receiving the packet, but the router still forwards it to all receivers. It does not verify the present outcome.
Question 315
A campus border is configured with two equal-cost external BGP paths but only one is installed for traffic forwarding. Which observed result would most directly prove the design meets the intended goal?
- Both eligible next hops appear in the forwarding table and share representative flows.
- Peer-received advertisements exclude the protected prefix while approved public routes remain.
- Other routers avoid using the overloaded node as unintended transit until it is ready.
- Traffic shares only across qualified routes and failed successors do not create a loop.
Explanation
Correct Answer
A:Enable and validate supported BGP multipath features subject to equal-path eligibility requirements. Verify the resulting network behavior rather than relying only on the saved configuration.
Incorrect Answers
B:This observation relates to a different topology: A partner BGP session accidentally advertises a sensitive 10.0.0.0/8 internal route to an external ASN. It does not verify the present outcome.
C:This observation relates to a different topology: The IS-IS backbone has a router in overload state after reboot and operators mistake it for an ordinary forwarding transit. It does not verify the present outcome.
D:This observation relates to a different topology: A designer proposes unequal-cost EIGRP load sharing for two paths whose topology prevents one path from meeting the feasibility condition. It does not verify the present outcome.
Question 316
A new MST campus region accidentally has a different VLAN-to-instance mapping on one distribution switch. Which observed result would most directly prove the design meets the intended goal?
- A tested hardware or supervisor failure meets application recovery objectives without unexpected shared dependencies.
- Clients retain gateway reachability after either distribution switch fails.
- Both routed uplinks forward to the rest of campus and a link failure reroutes traffic without a campus STP event.
- Switches participate in the expected common region and root placement is consistent per instance.
Explanation
Correct Answer
D:Align MST region name, revision, and VLAN-to-instance mapping on intended peers. Verify the resulting network behavior rather than relying only on the saved configuration.
Incorrect Answers
A:This observation relates to a different topology: A virtualized distribution pair uses one logical control plane and engineers assume it offers separate failure domains like two chassis in different buildings. It does not verify the present outcome.
B:This observation relates to a different topology: A building has two independent distribution switches but hosts use the physical IP of one switch as their default gateway. It does not verify the present outcome.
C:This observation relates to a different topology: A routed-access campus needs equal-cost forwarding to two distribution routers while keeping each VLAN local to one wiring closet. It does not verify the present outcome.
Question 317
A small branch must use both Internet and private MPLS, and engineers assume the two underlays cannot coexist on one SD-WAN edge. Which observed result would most directly prove the design meets the intended goal?
- Protected traffic crosses an established security association and is unreadable on the public underlay.
- A controlled failure of either carrier access route leaves required service operational on the independent path.
- The edge establishes intended tunnels over both transports and applications use their approved paths.
- Approved Ethernet frames reach the remote service endpoint while unrelated VLANs remain excluded.
Explanation
Correct Answer
C:Design distinct supported transport interfaces and TLOC colors with centralized path policy. Verify the resulting network behavior rather than relying only on the saved configuration.
Incorrect Answers
A:This observation relates to a different topology: A site-to-site tunnel must protect financial payload confidentiality and integrity across the public internet. It does not verify the present outcome.
B:This observation relates to a different topology: A bank contracts two MPLS providers but both fiber tails enter the building through the same conduit. It does not verify the present outcome.
D:This observation relates to a different topology: Two industrial sites require transparent delivery of a small set of Ethernet services and reject routing between their private LANs. It does not verify the present outcome.
Question 318
A multicast network has active PIM neighbors but one edge switch suppresses IGMP reports after an access-layer topology change. Which observed result would most directly prove the design meets the intended goal?
- Receiver ports are present in membership tables and only eligible ports receive the stream.
- Delay-sensitive traffic receives scheduled treatment at both campus and WAN congestion points.
- A WAN outage still produces actionable diagnostics and authorized operator access.
- Unit administrators can reach authorized nodes but are denied management of unrelated infrastructure.
Explanation
Correct Answer
A:Correct receiver membership handling and ensure snooping querier or routing interface behavior is consistent. Verify the resulting network behavior rather than relying only on the saved configuration.
Incorrect Answers
B:This observation relates to a different topology: A campus designs priority queues only on the access switch but ignores a congested upstream WAN edge. It does not verify the present outcome.
C:This observation relates to a different topology: Network management of a branch uses a VPN over its sole primary WAN, and the organization reports no way to diagnose a provider outage. It does not verify the present outcome.
D:This observation relates to a different topology: Two business units share one management VLAN with unrestricted access to each other's routers. It does not verify the present outcome.
Question 319
A designer proposes unequal-cost EIGRP load sharing for two paths whose topology prevents one path from meeting the feasibility condition. Which observed result would most directly prove the design meets the intended goal?
- Hubs avoid querying through the branch as a transit path and branch-local prefixes remain visible.
- Traffic shares only across qualified routes and failed successors do not create a loop.
- Both eligible next hops appear in the forwarding table and share representative flows.
- Failed-route convergence completes without broad stuck-in-active propagation.
Explanation
Correct Answer
B:Select feasible successors that meet EIGRP feasibility requirements and use variance only on eligible paths. Verify the resulting network behavior rather than relying only on the saved configuration.
Incorrect Answers
A: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.
C:This observation relates to a different topology: A campus border is configured with two equal-cost external BGP paths but only one is installed for traffic forwarding. It does not verify the present outcome.
D:This observation relates to a different topology: An EIGRP core has routes stuck active after one WAN path fails and queries spread into many remote sites. It does not verify the present outcome.
Question 320
A wireless access-point refresh increases PoE needs above the available 802.3at class on older switches. Which observed result would most directly prove the design meets the intended goal?
- Permitted uplinks forward under normal operation and converge cleanly on individual link loss.
- Gateway traffic survives a controlled supervisor transition within the approved outage budget.
- Guest clients roam as designed and cannot access restricted enterprise segments.
- Each AP enables its intended radio features at full load without power denial or downshift.
Explanation
Correct Answer
D:Specify access switch PoE capabilities and power budget that support the APs' required negotiated power levels. Verify the resulting network behavior rather than relying only on the saved configuration.
Incorrect Answers
A:This observation relates to a different topology: Multiple access switches connect to one distribution block through independent Layer 2 uplinks with a blocked redundant path. It does not verify the present outcome.
B:This observation relates to a different topology: A remote campus uses two distribution switches and requires nonstop gateway access during a planned supervisor replacement. It does not verify the present outcome.
C:This observation relates to a different topology: A fabric site needs a guest wireless SSID without extending the guest Layer 2 domain across the whole enterprise. It does not verify the present outcome.
Designing Cisco Enterprise Networks (ENSLD) (300-420) Practice Tests
