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Question 140
A regional backbone uses two VSX switches but operators accidentally configure different VLANs on the peers. What should be included in the rollout plan to limit a foreseeable failure?
- Spread critical APs across members or provide alternate coverage where feasible
- Use side-by-side peer diffs before deploying a new shared VLAN
- Keep a labeled spare and verified configuration backup before swapping hardware
- Validate the topology against the supported platform guide before modifying failover roles
Explanation
Correct Answer
B:Preflight checks prevent asymmetric blackholes in the pair. Divergent peer settings may appear only on one hashed path.
Incorrect Answers
A:Power-domain diversity limits a single member's impact. By contrast, preflight checks prevent asymmetric blackholes in the pair.
C:A documented spare path shortens user downtime. It would not resolve the documented symptom; preflight checks prevent asymmetric blackholes in the pair.
D:Ad hoc changes to both peers can worsen an existing loop. In this situation, preflight checks prevent asymmetric blackholes in the pair.
Question 141
A remote hub must survive a fiber ring break while still keeping a campus access VLAN available. What should the network engineer do to address this requirement?
- Verify PoE distribution and surviving port locations in the VSF design
- Design the supported ring or routed redundancy mechanism and its convergence behavior
- Use LACP or an appropriately configured spanning-tree topology for parallel paths
- Follow the supported member replacement and stack-identity restoration steps
Explanation
Correct Answer
B:Physical rings require a control plane that prevents loops in normal service. A ring drawing is insufficient evidence of reconvergence.
Incorrect Answers
A:Logical redundancy cannot power devices physically attached to a failed chassis. It would not resolve the documented symptom; physical rings require a control plane that prevents loops in normal service.
C:Redundancy needs deterministic forwarding and loop prevention. The relevant technical distinction is that physical rings require a control plane that prevents loops in normal service.
D:A correctly provisioned replacement rejoins without overwriting the surviving stack. By contrast, physical rings require a control plane that prevents loops in normal service.
Question 142
A remote hub must survive a fiber ring break while still keeping a campus access VLAN available. What should the team inspect to confirm the result?
- Inspect stack membership, conductor role and port availability during member removal
- Measure loss and forwarding state before and after a selected fiber cut
- Test a planned building-level power failure and verify alternate gateway and path availability
- Check each VRF route table and allowed cross-VRF flow in a live test
Explanation
Correct Answer
B:A ring drawing is insufficient evidence of reconvergence. Physical rings require a control plane that prevents loops in normal service.
Incorrect Answers
A:A healthy stack must maintain the intended surviving interfaces. Here, however, a ring drawing is insufficient evidence of reconvergence.
C:Device-level failover cannot prove building-level recovery. The relevant technical distinction is that a ring drawing is insufficient evidence of reconvergence.
D:Distinct route entries prove isolation beyond VLAN tagging. By contrast, a ring drawing is insufficient evidence of reconvergence.
Question 143
A remote hub must survive a fiber ring break while still keeping a campus access VLAN available. Which misconception is most likely to obstruct a correct fix?
- Assume VSX and VSF provide identical control-plane and management behavior
- Treat a physically closed Ethernet ring as automatically loop-free without STP or equivalent protection
- Assume a shared virtual IP alone determines correct routing on each VSX node
- Assume every physically connected redundant link must forward simultaneously in all designs
Explanation
Correct Answer
B:Redundant physical paths can cause persistent flooding. Physical rings require a control plane that prevents loops in normal service.
Incorrect Answers
A:VSX retains independent switch controls while VSF virtualizes a stack. In this situation, redundant physical paths can cause persistent flooding.
C:Each peer still needs valid routed interfaces and protocol state. Here, however, redundant physical paths can cause persistent flooding.
D:Some topologies intentionally block alternate paths to avoid loops. The relevant technical distinction is that redundant physical paths can cause persistent flooding.
Question 144
A remote hub must survive a fiber ring break while still keeping a campus access VLAN available. What precaution is most important before the change is expanded?
- Restore an isolated keepalive path and rehearse partial-link failures in a lab
- Test a primary uplink failure and check that the intended backup becomes active
- Validate the topology against the supported platform guide before modifying failover roles
- Record both maintenance and unexpected-break scenarios with rollback contacts
Explanation
Correct Answer
D:Recovery plans must handle failures different from a clean link shutdown. A ring drawing is insufficient evidence of reconvergence.
Incorrect Answers
A:Control-plane resilience requires tested failure combinations. It would not resolve the documented symptom; recovery plans must handle failures different from a clean link shutdown.
B:A blocked standby path is only useful if it recovers service. In this situation, recovery plans must handle failures different from a clean link shutdown.
C:Ad hoc changes to both peers can worsen an existing loop. Here, however, recovery plans must handle failures different from a clean link shutdown.
Question 145
A VSX aggregation peer is rebooted for a firmware update while remote users have long-lived sessions. Which configuration decision most directly resolves the situation?
- Review active-gateway and routing behavior across both peers including inter-peer paths
- Validate both VSX multi-chassis LAG path diversity and upstream routed reachability
- Check current peer symmetry and multi-chassis LAG availability before maintenance
- Check inter-switch link negotiation, optics and VSX state synchronization
Explanation
Correct Answer
C:The surviving peer must carry intended traffic before one node stops. Peer role alone does not validate end-to-end availability.
Incorrect Answers
A:Incorrect gateway or route state can circulate traffic between peers. By contrast, the surviving peer must carry intended traffic before one node stops.
B:First-hop availability must include both downstream and upstream network paths. It would not resolve the documented symptom; the surviving peer must carry intended traffic before one node stops.
D:VSX peer synchronization depends on a stable and correctly configured ISL. In this situation, the surviving peer must carry intended traffic before one node stops.
Question 146
A VSX aggregation peer is rebooted for a firmware update while remote users have long-lived sessions. Which check most directly demonstrates the desired network behavior?
- Observe access LAG state, active gateway reachability and application sessions during reboot
- Test a planned building-level power failure and verify alternate gateway and path availability
- Inspect stack uplink configuration and per-member LACP or STP counters
- Check each VRF route table and allowed cross-VRF flow in a live test
Explanation
Correct Answer
A:Peer role alone does not validate end-to-end availability. The surviving peer must carry intended traffic before one node stops.
Incorrect Answers
B:Device-level failover cannot prove building-level recovery. The relevant technical distinction is that peer role alone does not validate end-to-end availability.
C:The actual state identifies a blocked path versus a fault. By contrast, peer role alone does not validate end-to-end availability.
D:Distinct route entries prove isolation beyond VLAN tagging. It would not resolve the documented symptom; peer role alone does not validate end-to-end availability.
Question 147
A VSX aggregation peer is rebooted for a firmware update while remote users have long-lived sessions. Which assumption would be most misleading when investigating this situation?
- Assume every physically connected redundant link must forward simultaneously in all designs
- Assume VSX and VSF provide identical control-plane and management behavior
- Assume a shared virtual IP alone determines correct routing on each VSX node
- Assume VSX high availability guarantees zero application loss under every upgrade condition
Explanation
Correct Answer
D:Network services can depend on external routing and client behavior. The surviving peer must carry intended traffic before one node stops.
Incorrect Answers
A:Some topologies intentionally block alternate paths to avoid loops. Here, however, network services can depend on external routing and client behavior.
B:VSX retains independent switch controls while VSF virtualizes a stack. The relevant technical distinction is that network services can depend on external routing and client behavior.
C:Each peer still needs valid routed interfaces and protocol state. By contrast, network services can depend on external routing and client behavior.
Question 148
A VSX aggregation peer is rebooted for a firmware update while remote users have long-lived sessions. Which safeguard best reduces the deployment risk in this case?
- Test a primary uplink failure and check that the intended backup becomes active
- Run a controlled single-peer maintenance with a rollback and stop criteria
- Keep diverse stack links and validate surviving PoE and uplink capacity
- Validate the topology against the supported platform guide before modifying failover roles
Explanation
Correct Answer
B:A staged operation prevents simultaneous loss of both forwarding planes. Peer role alone does not validate end-to-end availability.
Incorrect Answers
A:A blocked standby path is only useful if it recovers service. The relevant technical distinction is that a staged operation prevents simultaneous loss of both forwarding planes.
C:A member failure may remove both power and forwarding ports. In this situation, a staged operation prevents simultaneous loss of both forwarding planes.
D:Ad hoc changes to both peers can worsen an existing loop. Here, however, a staged operation prevents simultaneous loss of both forwarding planes.
Question 149
A school operates VRFs for teaching and administration on one pair of AOS-CX switches. What is the most appropriate first technical change?
- Design separate power domains and redundant routed campus links rather than relying only on one chassis
- Deploy a supported VSX pair with multi-chassis LAG and compatible peer coordination
- Use separate VRF routing instances with explicit authorized route leaking where needed
- Validate both VSX multi-chassis LAG path diversity and upstream routed reachability
Explanation
Correct Answer
C:Independent routing tables can segregate traffic on shared physical hardware. Distinct route entries prove isolation beyond VLAN tagging.
Incorrect Answers
A:Geographic power isolation must accompany logical path redundancy. Here, however, independent routing tables can segregate traffic on shared physical hardware.
B:VSX can present resilient LAG connectivity while preserving independent control planes. In this situation, independent routing tables can segregate traffic on shared physical hardware.
D:First-hop availability must include both downstream and upstream network paths. It would not resolve the documented symptom; independent routing tables can segregate traffic on shared physical hardware.
Question 150
A school operates VRFs for teaching and administration on one pair of AOS-CX switches. Which observation would best verify that the intended behavior is working?
- Inspect stack uplink configuration and per-member LACP or STP counters
- Check each VRF route table and allowed cross-VRF flow in a live test
- Compare per-tenant utilization and queue drops under concurrent load
- Observe access LAG state, active gateway reachability and application sessions during reboot
Explanation
Correct Answer
B:Distinct route entries prove isolation beyond VLAN tagging. Independent routing tables can segregate traffic on shared physical hardware.
Incorrect Answers
A:The actual state identifies a blocked path versus a fault. It would not resolve the documented symptom; distinct route entries prove isolation beyond VLAN tagging.
C:Resource contention may not appear in a single-tenant test. By contrast, distinct route entries prove isolation beyond VLAN tagging.
D:Peer role alone does not validate end-to-end availability. In this situation, distinct route entries prove isolation beyond VLAN tagging.
HPE Network Campus Access Professional (HPE7-A01) Practice Tests