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Question 160
A VSF stack has two uplinks connected to different physical members but only one is forwarding. Which safeguard best reduces the deployment risk in this case?
- Restore an isolated keepalive path and rehearse partial-link failures in a lab
- Document independent power, diverse fiber paths and recovery ownership
- 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
Explanation
Correct Answer
C:A blocked standby path is only useful if it recovers service. The actual state identifies a blocked path versus a fault.
Incorrect Answers
A:Control-plane resilience requires tested failure combinations. It would not resolve the documented symptom; a blocked standby path is only useful if it recovers service.
B:True resilience removes shared physical points of failure. In this situation, a blocked standby path is only useful if it recovers service.
D:A staged operation prevents simultaneous loss of both forwarding planes. By contrast, a blocked standby path is only useful if it recovers service.
Question 161
A VSX active-gateway deployment has an intermittent L3 forwarding loop after a change. What is the most appropriate first technical change?
- Verify the LAG or STP configuration that controls uplink redundancy
- Review active-gateway and routing behavior across both peers including inter-peer paths
- Use separate VRF routing instances with explicit authorized route leaking where needed
- Check inter-switch link negotiation, optics and VSX state synchronization
Explanation
Correct Answer
B:Incorrect gateway or route state can circulate traffic between peers. A full-path inspection exposes unexpected inter-switch forwarding.
Incorrect Answers
A:The forwarding state may be deliberate under loop-prevention rules. By contrast, incorrect gateway or route state can circulate traffic between peers.
C:Independent routing tables can segregate traffic on shared physical hardware. The relevant technical distinction is that incorrect gateway or route state can circulate traffic between peers.
D:VSX peer synchronization depends on a stable and correctly configured ISL. It would not resolve the documented symptom; incorrect gateway or route state can circulate traffic between peers.
Question 162
A VSX active-gateway deployment has an intermittent L3 forwarding loop after a change. Which observation would best verify that the intended behavior is working?
- Compare per-tenant utilization and queue drops under concurrent load
- Compare effective configuration and member software before and after an election
- Check AP uplink placement and power draw before and after member loss
- Trace a client flow and inspect both peers' next-hop and MAC tables
Explanation
Correct Answer
D:A full-path inspection exposes unexpected inter-switch forwarding. Incorrect gateway or route state can circulate traffic between peers.
Incorrect Answers
A:Resource contention may not appear in a single-tenant test. The relevant technical distinction is that a full-path inspection exposes unexpected inter-switch forwarding.
B:A new conductor should not silently lose edge security settings. Here, however, a full-path inspection exposes unexpected inter-switch forwarding.
C:Resilient switching requires enough live physical interfaces. By contrast, a full-path inspection exposes unexpected inter-switch forwarding.
Question 163
A VSX active-gateway deployment has an intermittent L3 forwarding loop after a change. Which belief about the configuration should the team reject?
- Assume all VSX configuration is automatically synchronized without enabling supported sync settings
- Assume VSX high availability guarantees zero application loss under every upgrade condition
- Assume a shared virtual IP alone determines correct routing on each VSX node
- Treat a physically closed Ethernet ring as automatically loop-free without STP or equivalent protection
Explanation
Correct Answer
C:Each peer still needs valid routed interfaces and protocol state. Incorrect gateway or route state can circulate traffic between peers.
Incorrect Answers
A:Only configured sync categories are replicated. In this situation, each peer still needs valid routed interfaces and protocol state.
B:Network services can depend on external routing and client behavior. The relevant technical distinction is that each peer still needs valid routed interfaces and protocol state.
D:Redundant physical paths can cause persistent flooding. Here, however, each peer still needs valid routed interfaces and protocol state.
Question 164
A VSX active-gateway deployment has an intermittent L3 forwarding loop after a change. What should be included in the rollout plan to limit a foreseeable failure?
- Test both peer and inter-switch-link failures during a maintenance rehearsal
- Capacity-test the combined peak workload and define failure-mode limits
- Validate the topology against the supported platform guide before modifying failover roles
- Restore an isolated keepalive path and rehearse partial-link failures in a lab
Explanation
Correct Answer
C:Ad hoc changes to both peers can worsen an existing loop. A full-path inspection exposes unexpected inter-switch forwarding.
Incorrect Answers
A:A topology must remain predictable when different components fail. In this situation, ad hoc changes to both peers can worsen an existing loop.
B:Shared resilience must be sized for the largest expected simultaneous demand. Here, however, ad hoc changes to both peers can worsen an existing loop.
D:Control-plane resilience requires tested failure combinations. It would not resolve the documented symptom; ad hoc changes to both peers can worsen an existing loop.
Question 165
A campus deployment requires switches at two buildings to maintain service despite separate local power failures. What should the network engineer do to address this requirement?
- Review the shared active-gateway virtual IP/MAC and SVI configuration on both peers
- Use separate VRF routing instances with explicit authorized route leaking where needed
- Design separate power domains and redundant routed campus links rather than relying only on one chassis
- Verify PoE distribution and surviving port locations in the VSF design
Explanation
Correct Answer
C:Geographic power isolation must accompany logical path redundancy. Device-level failover cannot prove building-level recovery.
Incorrect Answers
A:Consistent gateway parameters let either peer forward for the subnet. By contrast, geographic power isolation must accompany logical path redundancy.
B:Independent routing tables can segregate traffic on shared physical hardware. In this situation, geographic power isolation must accompany logical path redundancy.
D:Logical redundancy cannot power devices physically attached to a failed chassis. It would not resolve the documented symptom; geographic power isolation must accompany logical path redundancy.
Question 166
A campus deployment requires switches at two buildings to maintain service despite separate local power failures. What should the team inspect to confirm the result?
- Inspect stack uplink configuration and per-member LACP or STP counters
- Test a planned building-level power failure and verify alternate gateway and path availability
- Correlate ISL errors with VSX synchronization status and active LAG behavior
- Inspect keepalive reachability, ISL state and event logs on both nodes
Explanation
Correct Answer
B:Device-level failover cannot prove building-level recovery. Geographic power isolation must accompany logical path redundancy.
Incorrect Answers
A:The actual state identifies a blocked path versus a fault. It would not resolve the documented symptom; device-level failover cannot prove building-level recovery.
C:The timeline connects physical impairment to distributed control state. The relevant technical distinction is that device-level failover cannot prove building-level recovery.
D:Together they distinguish partial monitoring failure from full isolation. By contrast, device-level failover cannot prove building-level recovery.
Question 167
A campus deployment requires switches at two buildings to maintain service despite separate local power failures. Which misconception is most likely to obstruct a correct fix?
- Assume a healthy keepalive link replaces the data synchronization functions of the ISL
- Assume redundant supervisors in one building survive loss of that entire electrical feed
- Conclude the design is resilient because clients still ping their VLAN gateway
- Treat a physically closed Ethernet ring as automatically loop-free without STP or equivalent protection
Explanation
Correct Answer
B:Shared power is a common-mode failure. Geographic power isolation must accompany logical path redundancy.
Incorrect Answers
A:Keepalive and ISL serve different purposes. By contrast, shared power is a common-mode failure.
C:Local gateway tests do not establish routed service beyond the pair. The relevant technical distinction is that shared power is a common-mode failure.
D:Redundant physical paths can cause persistent flooding. Here, however, shared power is a common-mode failure.
Question 168
A campus deployment requires switches at two buildings to maintain service despite separate local power failures. What precaution is most important before the change is expanded?
- Document independent power, diverse fiber paths and recovery ownership
- Run a controlled single-peer maintenance with a rollback and stop criteria
- Test a primary uplink failure and check that the intended backup becomes active
- Capacity-test the combined peak workload and define failure-mode limits
Explanation
Correct Answer
A:True resilience removes shared physical points of failure. Device-level failover cannot prove building-level recovery.
Incorrect Answers
B:A staged operation prevents simultaneous loss of both forwarding planes. Here, however, true resilience removes shared physical points of failure.
C:A blocked standby path is only useful if it recovers service. The relevant technical distinction is that true resilience removes shared physical points of failure.
D:Shared resilience must be sized for the largest expected simultaneous demand. In this situation, true resilience removes shared physical points of failure.
Question 169
A switch pair remains up but a failed keepalive link makes VSX peer status uncertain. Which configuration decision most directly resolves the situation?
- Validate both VSX multi-chassis LAG path diversity and upstream routed reachability
- Diagnose keepalive path and documented split-brain protection alongside ISL state
- Follow the supported member replacement and stack-identity restoration steps
- Deploy a supported VSX pair with multi-chassis LAG and compatible peer coordination
Explanation
Correct Answer
B:Peer liveness detection protects against conflicting control-plane behavior. Together they distinguish partial monitoring failure from full isolation.
Incorrect Answers
A:First-hop availability must include both downstream and upstream network paths. In this situation, peer liveness detection protects against conflicting control-plane behavior.
C:A correctly provisioned replacement rejoins without overwriting the surviving stack. Here, however, peer liveness detection protects against conflicting control-plane behavior.
D:VSX can present resilient LAG connectivity while preserving independent control planes. It would not resolve the documented symptom; peer liveness detection protects against conflicting control-plane behavior.
Question 170
A switch pair remains up but a failed keepalive link makes VSX peer status uncertain. Which check most directly demonstrates the desired network behavior?
- Check AP uplink placement and power draw before and after member loss
- Inspect stack membership, conductor role and port availability during member removal
- Test a planned building-level power failure and verify alternate gateway and path availability
- Inspect keepalive reachability, ISL state and event logs on both nodes
Explanation
Correct Answer
D:Together they distinguish partial monitoring failure from full isolation. Peer liveness detection protects against conflicting control-plane behavior.
Incorrect Answers
A:Resilient switching requires enough live physical interfaces. It would not resolve the documented symptom; together they distinguish partial monitoring failure from full isolation.
B:A healthy stack must maintain the intended surviving interfaces. By contrast, together they distinguish partial monitoring failure from full isolation.
C:Device-level failover cannot prove building-level recovery. In this situation, together they distinguish partial monitoring failure from full isolation.
HPE Network Campus Access Professional (HPE7-A01) Practice Tests