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Question 290
A routed campus stack sees duplicate default gateway ARP replies from two uncoordinated devices. Which check most directly demonstrates the desired network behavior?
- Compare traffic counters and storm-control events before and after a controlled burst
- Capture gateway ARP replies and verify intended active/standby or active-gateway behavior
- Inspect switch trunk state and endpoint VLAN membership on each side
- Inspect snooping bindings and confirm test rogue offers are blocked while valid leases work
Explanation
Correct Answer
B:The MAC and virtual-address state explain competing replies. Coordinated gateway ownership avoids inconsistent ARP information.
Incorrect Answers
A:The threshold must catch abnormal traffic without suppressing normal discovery. By contrast, the MAC and virtual-address state explain competing replies.
C:Both tagged and untagged frames must reach their intended segment. It would not resolve the documented symptom; the MAC and virtual-address state explain competing replies.
D:The control must block the rogue source without breaking real DHCP. In this situation, the MAC and virtual-address state explain competing replies.
Question 291
A routed campus stack sees duplicate default gateway ARP replies from two uncoordinated devices. Which assumption would be most misleading when investigating this situation?
- Assume a common IPv4 subnet necessarily requires full host-to-host Layer 2 access
- Assign the same gateway IP independently to unrelated routers without an HA protocol
- Delete every VLAN with zero current MACs without checking scheduled or dormant devices
- Assume adding more IP routes will fix a MAC learning failure in the same VLAN
Explanation
Correct Answer
B:Duplicate addressing can cause intermittent reachability. Coordinated gateway ownership avoids inconsistent ARP information.
Incorrect Answers
A:Private VLAN design can restrict local peer communication. The relevant technical distinction is that duplicate addressing can cause intermittent reachability.
C:A quiet time window can miss legitimate off-hours use. By contrast, duplicate addressing can cause intermittent reachability.
D:Layer 3 route changes cannot correct a basic Layer 2 forwarding table problem. It would not resolve the documented symptom; duplicate addressing can cause intermittent reachability.
Question 292
A routed campus stack sees duplicate default gateway ARP replies from two uncoordinated devices. Which safeguard best reduces the deployment risk in this case?
- Verify the DHCP relay and any authorized server uplinks before enabling globally
- Record the faulted patch-port and confirm the cable path meets distance requirements
- Test gateway switchover with both links and management sessions monitored
- Document known exceptions such as docks and replacement NICs
Explanation
Correct Answer
C:Gateway failover must preserve client communication. The MAC and virtual-address state explain competing replies.
Incorrect Answers
A:Inaccurate trust boundaries can stop all address assignment. The relevant technical distinction is that gateway failover must preserve client communication.
B:Recurring bad media should not be treated as a software mystery. By contrast, gateway failover must preserve client communication.
D:Asset changes need a controlled authorization path. Here, however, gateway failover must preserve client communication.
Question 293
A campus switch's link aggregation is configured but all traffic travels on a single member. What is the most appropriate first technical change?
- Check creation of the VLAN and its permitted status on each relevant trunk
- Review LACP distribution and supported per-flow hashing behavior
- Inspect trunk allowed-VLAN lists and native/tagged state at both switches
- Map the supported interface identifiers to the intended patch-panel ports before applying configuration
Explanation
Correct Answer
B:Hashing can preserve a flow on one member even when the bundle has several links. Flow diversity reveals whether traffic balancing is occurring.
Incorrect Answers
A:An allowed tag that does not exist or propagate cannot forward frames. In this situation, hashing can preserve a flow on one member even when the bundle has several links.
C:Missing one VLAN on an otherwise healthy trunk isolates the problem to membership. The relevant technical distinction is that hashing can preserve a flow on one member even when the bundle has several links.
D:A valid port label on one platform may refer to a different port on another. Here, however, hashing can preserve a flow on one member even when the bundle has several links.
Question 294
A campus switch's link aggregation is configured but all traffic travels on a single member. Which observation would best verify that the intended behavior is working?
- Connect an authorized phone and PC, then a third test device, and observe violation behavior
- Check receiver joins, multicast routing state and per-VLAN forwarding
- Compare multiple distinct flows and member byte counters under load
- Measure broadcast utilization and user performance before and after moving a pilot subnet
Explanation
Correct Answer
C:Flow diversity reveals whether traffic balancing is occurring. Hashing can preserve a flow on one member even when the bundle has several links.
Incorrect Answers
A:Both acceptance and rejection establish the effective limit. Here, however, flow diversity reveals whether traffic balancing is occurring.
B:Membership alone does not prove end-to-end multicast delivery. It would not resolve the documented symptom; flow diversity reveals whether traffic balancing is occurring.
D:Improved L2 containment should produce measurable results. In this situation, flow diversity reveals whether traffic balancing is occurring.
Question 295
A campus switch's link aggregation is configured but all traffic travels on a single member. Which TWO actions together implement the required change and verify that it works? Choose TWO.
- Check cabling category, connectors, negotiated speed and physical error counters
- Compare multiple distinct flows and member byte counters under load
- Check STP and trunk changes before expanding VLAN membership
- Remove unused VLAN membership after validating dependencies and routing
- Review LACP distribution and supported per-flow hashing behavior
Explanation
Correct Answers
B:Flow diversity reveals whether traffic balancing is occurring. Hashing can preserve a flow on one member even when the bundle has several links.
E:Hashing can preserve a flow on one member even when the bundle has several links. Flow diversity reveals whether traffic balancing is occurring.
Incorrect Answers
A:Electrical faults can cause frame corruption without affecting the configuration database. By contrast, hashing can preserve a flow on one member even when the bundle has several links.
C:An upstream loop or tagging error can worsen MAC churn. It would not resolve the documented symptom; aggregate advertised rate does not guarantee every individual application's speed.
D:Retiring dormant segments reduces accidental reachability and operational confusion. In this situation, hashing can preserve a flow on one member even when the bundle has several links.
Question 296
A campus switch's link aggregation is configured but all traffic travels on a single member. What should be included in the rollout plan to limit a foreseeable failure?
- Document IPv6 control-plane trust ports and test dual-stack clients
- Perform a denied cross-VLAN test and peer-review future trunk changes
- Size bundles for realistic traffic patterns and surviving member capacity
- Limit multicast to intended receivers and test one source leaving the network
Explanation
Correct Answer
C:Aggregate advertised rate does not guarantee every individual application's speed. Flow diversity reveals whether traffic balancing is occurring.
Incorrect Answers
A:Protecting only IPv4 leaves a separate attack path. It would not resolve the documented symptom; aggregate advertised rate does not guarantee every individual application's speed.
B:Negative testing guards against accidental sensitive VLAN expansion. By contrast, aggregate advertised rate does not guarantee every individual application's speed.
D:Uncontrolled multicast can consume shared uplink capacity. The relevant technical distinction is that aggregate advertised rate does not guarantee every individual application's speed.
Question 297
A new AOS-CX switch uses a different interface naming convention than an old template. What should the network engineer do to address this requirement?
- Restore the intended untagged VLAN or explicit tagged management transport
- Review LACP distribution and supported per-flow hashing behavior
- Apply supported RA guard at untrusted Layer 2 access ports
- Map the supported interface identifiers to the intended patch-panel ports before applying configuration
Explanation
Correct Answer
D:A valid port label on one platform may refer to a different port on another. Live adjacency checks catch wrong interface mappings.
Incorrect Answers
A:Untagged management frames must land in the proper VLAN at both link ends. By contrast, a valid port label on one platform may refer to a different port on another.
B:Hashing can preserve a flow on one member even when the bundle has several links. The relevant technical distinction is that a valid port label on one platform may refer to a different port on another.
C:RA guard can limit who is allowed to advertise IPv6 routers to clients. Here, however, a valid port label on one platform may refer to a different port on another.
Question 298
A new AOS-CX switch uses a different interface naming convention than an old template. What should the team inspect to confirm the result?
- Measure broadcast utilization and user performance before and after moving a pilot subnet
- Inspect active members, hashed session paths and tagged-frame counters under load
- Connect an authorized phone and PC, then a third test device, and observe violation behavior
- Verify LLDP neighbors and configured roles on sample physical ports after deployment
Explanation
Correct Answer
D:Live adjacency checks catch wrong interface mappings. A valid port label on one platform may refer to a different port on another.
Incorrect Answers
A:Improved L2 containment should produce measurable results. In this situation, live adjacency checks catch wrong interface mappings.
B:Per-member evidence helps isolate a bad link or mismatch. Here, however, live adjacency checks catch wrong interface mappings.
C:Both acceptance and rejection establish the effective limit. The relevant technical distinction is that live adjacency checks catch wrong interface mappings.
Question 299
A new AOS-CX switch uses a different interface naming convention than an old template. Which misconception is most likely to obstruct a correct fix?
- Assume a common IPv4 subnet necessarily requires full host-to-host Layer 2 access
- Paste old port commands without reviewing platform port layout or supported syntax
- Assume AP management remains accessible because wireless client VLANs still pass
- Leave a switchport as an unconfigured access VLAN and assume it creates a Layer 3 transit
Explanation
Correct Answer
B:Blind migrations can apply uplink settings to user interfaces. A valid port label on one platform may refer to a different port on another.
Incorrect Answers
A:Private VLAN design can restrict local peer communication. Here, however, blind migrations can apply uplink settings to user interfaces.
C:Control and data networks can have different tags. In this situation, blind migrations can apply uplink settings to user interfaces.
D:VLAN switching does not imply an addressed routed interface. It would not resolve the documented symptom; blind migrations can apply uplink settings to user interfaces.
Question 300
A new AOS-CX switch uses a different interface naming convention than an old template. Which THREE steps together deliver the change, verify its effect, and reduce rollout risk? Choose THREE.
- Map the supported interface identifiers to the intended patch-panel ports before applying configuration
- Investigate a Layer 2 loop and restore a supported spanning-tree or LAG design
- Apply the supported private-VLAN isolation and promiscuous-port mapping
- Verify LLDP neighbors and configured roles on sample physical ports after deployment
- Require approval and a loop-free design for downstream bridges
- Pilot one switch and retain a port-by-port mapping sheet
Explanation
Correct Answers
A:A valid port label on one platform may refer to a different port on another. Live adjacency checks catch wrong interface mappings.
D:Live adjacency checks catch wrong interface mappings. A valid port label on one platform may refer to a different port on another.
F:A verified mapping prevents repeating the same mistake across a batch. Live adjacency checks catch wrong interface mappings.
Incorrect Answers
B:MAC movement can signal circulating frames across parallel physical links. By contrast, a valid port label on one platform may refer to a different port on another.
C:Layer 2 host isolation can be implemented without changing each host's address plan. In this situation, a valid port label on one platform may refer to a different port on another.
E:An access drop should not silently become an unmanaged uplink. It would not resolve the documented symptom; a verified mapping prevents repeating the same mistake across a batch.
HPE Network Campus Access Professional (HPE7-A01) Practice Tests