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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.
Question 171
A switch pair remains up but a failed keepalive link makes VSX peer status uncertain. Which assumption would be most misleading when investigating this situation?
- Disable all peer-liveness checks merely to clear an operational alarm
- Assume VSX high availability guarantees zero application loss under every upgrade condition
- Assume a common VSF control plane supplies power to ports on a failed unit
- Assume two access VLANs alone provide separate routing tables within one default VRF
Explanation
Correct Answer
A:Suppressing detection can increase split-brain risk. Peer liveness detection protects against conflicting control-plane behavior.
Incorrect Answers
B:Network services can depend on external routing and client behavior. The relevant technical distinction is that suppressing detection can increase split-brain risk.
C:Stacking virtualizes management, not the failed hardware's electrical outputs. By contrast, suppressing detection can increase split-brain risk.
D:VLAN segmentation need not separate L3 forwarding contexts. It would not resolve the documented symptom; suppressing detection can increase split-brain risk.
Question 172
A switch pair remains up but a failed keepalive link makes VSX peer status uncertain. Which safeguard best reduces the deployment risk in this case?
- Test a primary uplink failure and check that the intended backup becomes active
- Restore an isolated keepalive path and rehearse partial-link failures in a lab
- 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:Control-plane resilience requires tested failure combinations. Together they distinguish partial monitoring failure from full isolation.
Incorrect Answers
A:A blocked standby path is only useful if it recovers service. The relevant technical distinction is that control-plane resilience requires tested failure combinations.
C:A member failure may remove both power and forwarding ports. Here, however, control-plane resilience requires tested failure combinations.
D:Ad hoc changes to both peers can worsen an existing loop. By contrast, control-plane resilience requires tested failure combinations.
Question 173
A multi-member VSF deployment needs a predictable replacement procedure for a failed access switch. What is the most appropriate first technical change?
- Design the supported ring or routed redundancy mechanism and its convergence behavior
- Diagnose keepalive path and documented split-brain protection alongside ISL state
- Follow the supported member replacement and stack-identity restoration steps
- Review stack election priorities, software compatibility and synchronized configuration
Explanation
Correct Answer
C:A correctly provisioned replacement rejoins without overwriting the surviving stack. Hardware presence alone does not confirm the logical port numbering.
Incorrect Answers
A:Physical rings require a control plane that prevents loops in normal service. In this situation, a correctly provisioned replacement rejoins without overwriting the surviving stack.
B:Peer liveness detection protects against conflicting control-plane behavior. Here, however, a correctly provisioned replacement rejoins without overwriting the surviving stack.
D:Stable leadership and matching software reduce inconsistent stack state. The relevant technical distinction is that a correctly provisioned replacement rejoins without overwriting the surviving stack.
Question 174
A multi-member VSF deployment needs a predictable replacement procedure for a failed access switch. Which observation would best verify that the intended behavior is working?
- Confirm member ID, software and expected port profiles after it rejoins
- Check ARP/neighbor resolution and client gateway traffic on each peer separately
- Inspect active bundle members and blocked/forwarding STP states while changing links
- Compare VLAN, LAG and active-gateway parameters on each peer and test flows
Explanation
Correct Answer
A:Hardware presence alone does not confirm the logical port numbering. A correctly provisioned replacement rejoins without overwriting the surviving stack.
Incorrect Answers
B:A reachable VIP on one node does not prove resilient first-hop operation. It would not resolve the documented symptom; hardware presence alone does not confirm the logical port numbering.
C:These states reveal whether the physical backup is correctly controlled. Here, however, hardware presence alone does not confirm the logical port numbering.
D:Divergent peer settings may appear only on one hashed path. In this situation, hardware presence alone does not confirm the logical port numbering.
Question 175
A multi-member VSF deployment needs a predictable replacement procedure for a failed access switch. Which belief about the configuration should the team reject?
- Assume a healthy keepalive link replaces the data synchronization functions of the ISL
- Assume all VSX configuration is automatically synchronized without enabling supported sync settings
- Insert an unprepared device with duplicate member identity and assume ports map correctly
- Assume VSX high availability guarantees zero application loss under every upgrade condition
Explanation
Correct Answer
C:Identity conflict can attach users to unintended configuration. A correctly provisioned replacement rejoins without overwriting the surviving stack.
Incorrect Answers
A:Keepalive and ISL serve different purposes. In this situation, identity conflict can attach users to unintended configuration.
B:Only configured sync categories are replicated. It would not resolve the documented symptom; identity conflict can attach users to unintended configuration.
D:Network services can depend on external routing and client behavior. By contrast, identity conflict can attach users to unintended configuration.
Question 176
A multi-member VSF deployment needs a predictable replacement procedure for a failed access switch. What should be included in the rollout plan to limit a foreseeable failure?
- Replace an unsupported optic in a maintenance window and verify a safe recovery sequence
- Run a controlled single-peer maintenance with a rollback and stop criteria
- Keep a labeled spare and verified configuration backup before swapping hardware
- Test restricted traffic across VRFs and preserve management reachability
Explanation
Correct Answer
C:A documented spare path shortens user downtime. Hardware presence alone does not confirm the logical port numbering.
Incorrect Answers
A:A partially degraded peer pair can behave unpredictably under another failure. It would not resolve the documented symptom; a documented spare path shortens user downtime.
B:A staged operation prevents simultaneous loss of both forwarding planes. The relevant technical distinction is that a documented spare path shortens user downtime.
D:Incorrect leakage can undermine data segregation or strand support staff. By contrast, a documented spare path shortens user downtime.
Question 177
A pair of distribution switches is designed with active gateways but an uplink failure strands half of the access layer. What should the network engineer do to address this requirement?
- Use separate VRF routing instances with explicit authorized route leaking where needed
- Verify PoE distribution and surviving port locations in the VSF design
- Follow the supported member replacement and stack-identity restoration steps
- Validate both VSX multi-chassis LAG path diversity and upstream routed reachability
Explanation
Correct Answer
D:First-hop availability must include both downstream and upstream network paths. A responsive local gateway can coexist with a broken WAN route.
Incorrect Answers
A:Independent routing tables can segregate traffic on shared physical hardware. By contrast, first-hop availability must include both downstream and upstream network paths.
B:Logical redundancy cannot power devices physically attached to a failed chassis. The relevant technical distinction is that first-hop availability must include both downstream and upstream network paths.
C:A correctly provisioned replacement rejoins without overwriting the surviving stack. Here, however, first-hop availability must include both downstream and upstream network paths.
Question 178
A pair of distribution switches is designed with active gateways but an uplink failure strands half of the access layer. What should the team inspect to confirm the result?
- Compare effective configuration and member software before and after an election
- Confirm member ID, software and expected port profiles after it rejoins
- Compare per-tenant utilization and queue drops under concurrent load
- Simulate loss of each peer uplink and trace client sessions to off-subnet destinations
Explanation
Correct Answer
D:A responsive local gateway can coexist with a broken WAN route. First-hop availability must include both downstream and upstream network paths.
Incorrect Answers
A:A new conductor should not silently lose edge security settings. In this situation, a responsive local gateway can coexist with a broken WAN route.
B:Hardware presence alone does not confirm the logical port numbering. Here, however, a responsive local gateway can coexist with a broken WAN route.
C:Resource contention may not appear in a single-tenant test. The relevant technical distinction is that a responsive local gateway can coexist with a broken WAN route.
Question 179
A pair of distribution switches is designed with active gateways but an uplink failure strands half of the access layer. Which misconception is most likely to obstruct a correct fix?
- Conclude the design is resilient because clients still ping their VLAN gateway
- Disable all peer-liveness checks merely to clear an operational alarm
- Assume a common VSF control plane supplies power to ports on a failed unit
- Assume all newly inserted stack members inherit every configuration before joining completes
Explanation
Correct Answer
A:Local gateway tests do not establish routed service beyond the pair. First-hop availability must include both downstream and upstream network paths.
Incorrect Answers
B:Suppressing detection can increase split-brain risk. It would not resolve the documented symptom; local gateway tests do not establish routed service beyond the pair.
C:Stacking virtualizes management, not the failed hardware's electrical outputs. Here, however, local gateway tests do not establish routed service beyond the pair.
D:A joining device can be incompatible or in recovery state. In this situation, local gateway tests do not establish routed service beyond the pair.
Question 180
A pair of distribution switches is designed with active gateways but an uplink failure strands half of the access layer. What precaution is most important before the change is expanded?
- Run a controlled single-peer maintenance with a rollback and stop criteria
- Replace an unsupported optic in a maintenance window and verify a safe recovery sequence
- Document independent power, diverse fiber paths and recovery ownership
- Test upstream dependency failure independently of chassis failure
Explanation
Correct Answer
D:Multiple failure modes expose missing redundancy paths. A responsive local gateway can coexist with a broken WAN route.
Incorrect Answers
A:A staged operation prevents simultaneous loss of both forwarding planes. In this situation, multiple failure modes expose missing redundancy paths.
B:A partially degraded peer pair can behave unpredictably under another failure. By contrast, multiple failure modes expose missing redundancy paths.
C:True resilience removes shared physical points of failure. It would not resolve the documented symptom; multiple failure modes expose missing redundancy paths.
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