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Question 120
A VSX pair retains user forwarding but peer health alarms recur after a new ISL optic is installed. What precaution is most important before the change is expanded?
- Capacity-test the combined peak workload and define failure-mode limits
- Keep diverse stack links and validate surviving PoE and uplink capacity
- Replace an unsupported optic in a maintenance window and verify a safe recovery sequence
- Keep a labeled spare and verified configuration backup before swapping hardware
Explanation
Correct Answer
C:A partially degraded peer pair can behave unpredictably under another failure. The timeline connects physical impairment to distributed control state.
Incorrect Answers
A:Shared resilience must be sized for the largest expected simultaneous demand. In this situation, a partially degraded peer pair can behave unpredictably under another failure.
B:A member failure may remove both power and forwarding ports. It would not resolve the documented symptom; a partially degraded peer pair can behave unpredictably under another failure.
D:A documented spare path shortens user downtime. By contrast, a partially degraded peer pair can behave unpredictably under another failure.
Question 121
A routed campus core runs VSX active gateway but clients experience intermittent default-gateway loss. Which configuration decision most directly resolves the situation?
- Review the shared active-gateway virtual IP/MAC and SVI configuration on both peers
- Enable appropriate configuration synchronization or maintain reviewed matching objects
- Review stack election priorities, software compatibility and synchronized configuration
- Design the supported ring or routed redundancy mechanism and its convergence behavior
Explanation
Correct Answer
A:Consistent gateway parameters let either peer forward for the subnet. A reachable VIP on one node does not prove resilient first-hop operation.
Incorrect Answers
B:Both peers must support the same intended multi-chassis forwarding services. By contrast, consistent gateway parameters let either peer forward for the subnet.
C:Stable leadership and matching software reduce inconsistent stack state. It would not resolve the documented symptom; consistent gateway parameters let either peer forward for the subnet.
D:Physical rings require a control plane that prevents loops in normal service. The relevant technical distinction is that consistent gateway parameters let either peer forward for the subnet.
Question 122
A routed campus core runs VSX active gateway but clients experience intermittent default-gateway loss. Which check most directly demonstrates the desired network behavior?
- Inspect stack uplink configuration and per-member LACP or STP counters
- Confirm member ID, software and expected port profiles after it rejoins
- Inspect stack membership, conductor role and port availability during member removal
- Check ARP/neighbor resolution and client gateway traffic on each peer separately
Explanation
Correct Answer
D:A reachable VIP on one node does not prove resilient first-hop operation. Consistent gateway parameters let either peer forward for the subnet.
Incorrect Answers
A:The actual state identifies a blocked path versus a fault. The relevant technical distinction is that a reachable VIP on one node does not prove resilient first-hop operation.
B:Hardware presence alone does not confirm the logical port numbering. Here, however, a reachable VIP on one node does not prove resilient first-hop operation.
C:A healthy stack must maintain the intended surviving interfaces. By contrast, a reachable VIP on one node does not prove resilient first-hop operation.
Question 123
A routed campus core runs VSX active gateway but clients experience intermittent default-gateway loss. Which assumption would be most misleading when investigating this situation?
- Treat a physically closed Ethernet ring as automatically loop-free without STP or equivalent protection
- Assign two unrelated virtual MACs to what is supposed to be one VSX active gateway
- Assume two access VLANs alone provide separate routing tables within one default VRF
- Assume VSX high availability guarantees zero application loss under every upgrade condition
Explanation
Correct Answer
B:Inconsistent gateway identity may cause client neighbor changes and outages. Consistent gateway parameters let either peer forward for the subnet.
Incorrect Answers
A:Redundant physical paths can cause persistent flooding. In this situation, inconsistent gateway identity may cause client neighbor changes and outages.
C:VLAN segmentation need not separate L3 forwarding contexts. The relevant technical distinction is that inconsistent gateway identity may cause client neighbor changes and outages.
D:Network services can depend on external routing and client behavior. Here, however, inconsistent gateway identity may cause client neighbor changes and outages.
Question 124
A routed campus core runs VSX active gateway but clients experience intermittent default-gateway loss. Which safeguard best reduces the deployment risk in this case?
- Stage new members with matched firmware and a backup of the stack configuration
- Keep diverse stack links and validate surviving PoE and uplink capacity
- Test both peer failures and restore paths while recording ARP convergence
- Keep a labeled spare and verified configuration backup before swapping hardware
Explanation
Correct Answer
C:First-hop availability depends on neighboring hosts as well as the switches. A reachable VIP on one node does not prove resilient first-hop operation.
Incorrect Answers
A:Controlled joining lowers the risk of disrupting existing ports. It would not resolve the documented symptom; first-hop availability depends on neighboring hosts as well as the switches.
B:A member failure may remove both power and forwarding ports. Here, however, first-hop availability depends on neighboring hosts as well as the switches.
D:A documented spare path shortens user downtime. In this situation, first-hop availability depends on neighboring hosts as well as the switches.
Question 125
A dormitory access stack loses power to one member and several APs suddenly disconnect. What is the most appropriate first technical change?
- Build a supported VSF stack with correct stacking links, roles and firmware alignment
- Design the supported ring or routed redundancy mechanism and its convergence behavior
- Verify PoE distribution and surviving port locations in the VSF design
- Design separate power domains and redundant routed campus links rather than relying only on one chassis
Explanation
Correct Answer
C:Logical redundancy cannot power devices physically attached to a failed chassis. Resilient switching requires enough live physical interfaces.
Incorrect Answers
A:VSF creates a logical switch from supported members for simpler access-layer operation. By contrast, logical redundancy cannot power devices physically attached to a failed chassis.
B:Physical rings require a control plane that prevents loops in normal service. In this situation, logical redundancy cannot power devices physically attached to a failed chassis.
D:Geographic power isolation must accompany logical path redundancy. It would not resolve the documented symptom; logical redundancy cannot power devices physically attached to a failed chassis.
Question 126
A dormitory access stack loses power to one member and several APs suddenly disconnect. Which observation would best verify that the intended behavior is working?
- 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
- Inspect keepalive reachability, ISL state and event logs on both nodes
- Compare VLAN, LAG and active-gateway parameters on each peer and test flows
Explanation
Correct Answer
A:Resilient switching requires enough live physical interfaces. Logical redundancy cannot power devices physically attached to a failed chassis.
Incorrect Answers
B:A full-path inspection exposes unexpected inter-switch forwarding. The relevant technical distinction is that resilient switching requires enough live physical interfaces.
C:Together they distinguish partial monitoring failure from full isolation. By contrast, resilient switching requires enough live physical interfaces.
D:Divergent peer settings may appear only on one hashed path. It would not resolve the documented symptom; resilient switching requires enough live physical interfaces.
Question 127
A dormitory access stack loses power to one member and several APs suddenly disconnect. Which TWO actions together implement the required change and verify that it works? Choose TWO.
- Verify PoE distribution and surviving port locations in the VSF design
- Check AP uplink placement and power draw before and after member loss
- Test a primary uplink failure and check that the intended backup becomes active
- Design the supported ring or routed redundancy mechanism and its convergence behavior
- Build a supported VSF stack with correct stacking links, roles and firmware alignment
Explanation
Correct Answers
A:Logical redundancy cannot power devices physically attached to a failed chassis. Resilient switching requires enough live physical interfaces.
B:Resilient switching requires enough live physical interfaces. Logical redundancy cannot power devices physically attached to a failed chassis.
Incorrect Answers
C:A blocked standby path is only useful if it recovers service. The relevant technical distinction is that power-domain diversity limits a single member's impact.
D:Physical rings require a control plane that prevents loops in normal service. Here, however, logical redundancy cannot power devices physically attached to a failed chassis.
E:VSF creates a logical switch from supported members for simpler access-layer operation. By contrast, logical redundancy cannot power devices physically attached to a failed chassis.
Question 128
A dormitory access stack loses power to one member and several APs suddenly disconnect. What should be included in the rollout plan to limit a foreseeable failure?
- Capacity-test the combined peak workload and define failure-mode limits
- Replace an unsupported optic in a maintenance window and verify a safe recovery sequence
- Spread critical APs across members or provide alternate coverage where feasible
- Validate the topology against the supported platform guide before modifying failover roles
Explanation
Correct Answer
C:Power-domain diversity limits a single member's impact. Resilient switching requires enough live physical interfaces.
Incorrect Answers
A:Shared resilience must be sized for the largest expected simultaneous demand. In this situation, power-domain diversity limits a single member's impact.
B:A partially degraded peer pair can behave unpredictably under another failure. Here, however, power-domain diversity limits a single member's impact.
D:Ad hoc changes to both peers can worsen an existing loop. The relevant technical distinction is that power-domain diversity limits a single member's impact.
Question 129
A campus distribution pair should survive one uplink without Layer 2 loops during recovery. What should the network engineer do to address this requirement?
- Use LACP or an appropriately configured spanning-tree topology for parallel paths
- Deploy a supported VSX pair with multi-chassis LAG and compatible peer coordination
- Plan shared-resource limits and QoS allocation across the virtualized infrastructure
- Design the supported ring or routed redundancy mechanism and its convergence behavior
Explanation
Correct Answer
A:Redundancy needs deterministic forwarding and loop prevention. These states reveal whether the physical backup is correctly controlled.
Incorrect Answers
B:VSX can present resilient LAG connectivity while preserving independent control planes. It would not resolve the documented symptom; redundancy needs deterministic forwarding and loop prevention.
C:Separate logical domains still compete for physical ports and bandwidth. In this situation, redundancy needs deterministic forwarding and loop prevention.
D:Physical rings require a control plane that prevents loops in normal service. Here, however, redundancy needs deterministic forwarding and loop prevention.
Question 130
A campus distribution pair should survive one uplink without Layer 2 loops during recovery. 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
- Test a planned building-level power failure and verify alternate gateway and path availability
- Inspect active bundle members and blocked/forwarding STP states while changing links
Explanation
Correct Answer
D:These states reveal whether the physical backup is correctly controlled. Redundancy needs deterministic forwarding and loop prevention.
Incorrect Answers
A:A new conductor should not silently lose edge security settings. It would not resolve the documented symptom; these states reveal whether the physical backup is correctly controlled.
B:Hardware presence alone does not confirm the logical port numbering. In this situation, these states reveal whether the physical backup is correctly controlled.
C:Device-level failover cannot prove building-level recovery. By contrast, these states reveal whether the physical backup is correctly controlled.
HPE Network Campus Access Professional (HPE7-A01) Practice Tests