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Exam Code: HPE7-A01

Exam Name HPE Network Campus Access Professional

Certification Provider: HP

Corresponding Certification: HPE Aruba Networking Certified Professional - Campus Access

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HP HPE7-A01 Practice Test 84

Question 830

A switch receives BPDUs on an access edge configured with BPDU protection and disables the port. Which first diagnostic check is most useful before changing the network?

  1. Inspect device power module state and event notification configuration.
  2. Compare effective LAG VLAN membership with member/link status.
  3. Inspect spanning-tree root, port role, topology changes and BPDU counters.
  4. Inspect the port disable reason and BPDU-reception counter.

Explanation

Correct Answer

D:

This check collects evidence at the layer implicated by the symptom: the edge protection is responding to an unexpected bridge on a user-facing port. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when a core switch keeps forwarding after a power supply is removed, but a maintenance exercise shows no power fault alarm reaches operations, but is less direct for the issue at hand: the edge protection is responding to an unexpected bridge on a user-facing port.

B:

This would be a reasonable check when a dual-homed server loses access after one LAG member fails because the remaining link has a mismatched VLAN allow list, but is less direct for the issue at hand: the edge protection is responding to an unexpected bridge on a user-facing port.

C:

This would be a reasonable check when a distribution ring loses a link and traffic remains blocked despite alternate Layer 2 connectivity, but is less direct for the issue at hand: the edge protection is responding to an unexpected bridge on a user-facing port.

Question 831

A dual-homed server loses access after one LAG member fails because the remaining link has a mismatched VLAN allow list. Which first diagnostic check is most useful before changing the network?

  1. Compare effective LAG VLAN membership with member/link status.
  2. Inspect device power module state and event notification configuration.
  3. Inspect per-member software and join-rejection logs.
  4. Inspect spanning-tree root, port role, topology changes and BPDU counters.

Explanation

Correct Answer

A:

This check collects evidence at the layer implicated by the symptom: the surviving member forwards only a subset of the VLANs required by the server. Examine the evidence before choosing the corrective change.

Incorrect Answers

B:

This would be a reasonable check when a core switch keeps forwarding after a power supply is removed, but a maintenance exercise shows no power fault alarm reaches operations, but is less direct for the issue at hand: the surviving member forwards only a subset of the VLANs required by the server.

C:

This would be a reasonable check when a stack's standby control member cannot take over after a failover drill because the new member has incompatible firmware, but is less direct for the issue at hand: the surviving member forwards only a subset of the VLANs required by the server.

D:

This would be a reasonable check when a distribution ring loses a link and traffic remains blocked despite alternate Layer 2 connectivity, but is less direct for the issue at hand: the surviving member forwards only a subset of the VLANs required by the server.

Question 832

A site uses a single access-switch uplink to two cores with static routes and expects automatic gateway failover when the first core fails. Which first diagnostic check is most useful before changing the network?

  1. Inspect DHCP option 3 or host gateway settings and VRRP virtual address.
  2. Inspect host default gateway and the routing/gateway redundancy state.
  3. Inspect VSX peer, ISL and keepalive health individually.
  4. Inspect MAC flapping, STP events and interface broadcast counters.

Explanation

Correct Answer

B:

This check collects evidence at the layer implicated by the symptom: a fixed next hop does not itself provide gateway availability after its core fails. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when a campus uses VRRP on an SVI but hosts keep targeting a physical gateway address rather than the shared virtual address, but is less direct for the issue at hand: a fixed next hop does not itself provide gateway availability after its core fails.

C:

This would be a reasonable check when a VSX pair loses its inter-switch link and the team assumes the remaining keepalive alone carries user traffic between peers, but is less direct for the issue at hand: a fixed next hop does not itself provide gateway availability after its core fails.

D:

This would be a reasonable check when an access switch experiences a broadcast storm after a user connects two LAN ports with a patch cable, but is less direct for the issue at hand: a fixed next hop does not itself provide gateway availability after its core fails.

Question 833

A VSF stack has members connected in a line, so one intermember cable failure isolates the last unit. Which first diagnostic check is most useful before changing the network?

  1. Read LACP system IDs from both upstream peers and compare them.
  2. Inspect stack topology and member-link states.
  3. Trace keepalive source and destination routes and physical path dependencies.
  4. Correlate LACP timeout, VSX peer recovery and client packet-loss timestamps.

Explanation

Correct Answer

B:

This check collects evidence at the layer implicated by the symptom: a linear stacking topology leaves a single path to the last member. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when an edge switch's LACP bundle connects to two independent devices that are not configured as a VSX or equivalent multichassis domain, but is less direct for the issue at hand: a linear stacking topology leaves a single path to the last member.

C:

This would be a reasonable check when a VSX deployment uses a keepalive route through the same physical links as its inter-switch link, but is less direct for the issue at hand: a linear stacking topology leaves a single path to the last member.

D:

This would be a reasonable check when a VSX peer restarts for an upgrade and port-channel traffic drops because the downstream LACP timeout is too strict for the expected convergence, but is less direct for the issue at hand: a linear stacking topology leaves a single path to the last member.

Question 834

A campus uses VRRP on an SVI but hosts keep targeting a physical gateway address rather than the shared virtual address. Which first diagnostic check is most useful before changing the network?

  1. Inspect DHCP option 3 or host gateway settings and VRRP virtual address.
  2. Inspect hello packets, area IDs and neighbor state for the failing link.
  3. Inspect device power module state and event notification configuration.
  4. Compare effective LAG VLAN membership with member/link status.

Explanation

Correct Answer

A:

This check collects evidence at the layer implicated by the symptom: hosts pointing to a physical router address cannot benefit from VRRP gateway movement. Examine the evidence before choosing the corrective change.

Incorrect Answers

B:

This would be a reasonable check when a redundant OSPF network has two uplinks, but one interface's routing adjacency never forms because its area ID is wrong, but is less direct for the issue at hand: hosts pointing to a physical router address cannot benefit from VRRP gateway movement.

C:

This would be a reasonable check when a core switch keeps forwarding after a power supply is removed, but a maintenance exercise shows no power fault alarm reaches operations, but is less direct for the issue at hand: hosts pointing to a physical router address cannot benefit from VRRP gateway movement.

D:

This would be a reasonable check when a dual-homed server loses access after one LAG member fails because the remaining link has a mismatched VLAN allow list, but is less direct for the issue at hand: hosts pointing to a physical router address cannot benefit from VRRP gateway movement.

Question 835

A redundant OSPF network has two uplinks, but one interface's routing adjacency never forms because its area ID is wrong. Which first diagnostic check is most useful before changing the network?

  1. Inspect hello packets, area IDs and neighbor state for the failing link.
  2. Trace keepalive source and destination routes and physical path dependencies.
  3. Compare active-gateway configuration and ARP responses across both peers.
  4. Read LACP system IDs from both upstream peers and compare them.

Explanation

Correct Answer

A:

This check collects evidence at the layer implicated by the symptom: OSPF peers in different areas cannot establish a normal shared-segment adjacency. Examine the evidence before choosing the corrective change.

Incorrect Answers

B:

This would be a reasonable check when a VSX deployment uses a keepalive route through the same physical links as its inter-switch link, but is less direct for the issue at hand: OSPF peers in different areas cannot establish a normal shared-segment adjacency.

C:

This would be a reasonable check when two VSX peers advertise a default gateway, but client MAC learning oscillates after the peers use inconsistent active-gateway MAC addresses, but is less direct for the issue at hand: OSPF peers in different areas cannot establish a normal shared-segment adjacency.

D:

This would be a reasonable check when an edge switch's LACP bundle connects to two independent devices that are not configured as a VSX or equivalent multichassis domain, but is less direct for the issue at hand: OSPF peers in different areas cannot establish a normal shared-segment adjacency.

Question 836

A core switch keeps forwarding after a power supply is removed, but a maintenance exercise shows no power fault alarm reaches operations. Which first diagnostic check is most useful before changing the network?

  1. Inspect device power module state and event notification configuration.
  2. Inspect MAC flapping, STP events and interface broadcast counters.
  3. Inspect bridge IDs and root port selection from both switches.
  4. Inspect per-member software and join-rejection logs.

Explanation

Correct Answer

A:

This check collects evidence at the layer implicated by the symptom: redundant hardware can mask a failure unless power-supply status is monitored. Examine the evidence before choosing the corrective change.

Incorrect Answers

B:

This would be a reasonable check when an access switch experiences a broadcast storm after a user connects two LAN ports with a patch cable, but is less direct for the issue at hand: redundant hardware can mask a failure unless power-supply status is monitored.

C:

This would be a reasonable check when two redundant switches disagree about the device that should be the STP root for a campus distribution VLAN, but is less direct for the issue at hand: redundant hardware can mask a failure unless power-supply status is monitored.

D:

This would be a reasonable check when a stack's standby control member cannot take over after a failover drill because the new member has incompatible firmware, but is less direct for the issue at hand: redundant hardware can mask a failure unless power-supply status is monitored.

Question 837

A VSX peer restarts for an upgrade and port-channel traffic drops because the downstream LACP timeout is too strict for the expected convergence. Which first diagnostic check is most useful before changing the network?

  1. Inspect per-member software and join-rejection logs.
  2. Correlate LACP timeout, VSX peer recovery and client packet-loss timestamps.
  3. Compare effective LAG VLAN membership with member/link status.
  4. Inspect stack topology and member-link states.

Explanation

Correct Answer

B:

This check collects evidence at the layer implicated by the symptom: the downstream aggregator declares the shared peer unavailable before the intended recovery completes. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when a stack's standby control member cannot take over after a failover drill because the new member has incompatible firmware, but is less direct for the issue at hand: the downstream aggregator declares the shared peer unavailable before the intended recovery completes.

C:

This would be a reasonable check when a dual-homed server loses access after one LAG member fails because the remaining link has a mismatched VLAN allow list, but is less direct for the issue at hand: the downstream aggregator declares the shared peer unavailable before the intended recovery completes.

D:

This would be a reasonable check when a VSF stack has members connected in a line, so one intermember cable failure isolates the last unit, but is less direct for the issue at hand: the downstream aggregator declares the shared peer unavailable before the intended recovery completes.

Question 838

An access switch experiences a broadcast storm after a user connects two LAN ports with a patch cable. Which first diagnostic check is most useful before changing the network?

  1. Inspect MAC flapping, STP events and interface broadcast counters.
  2. Compare active-gateway configuration and ARP responses across both peers.
  3. Inspect stack topology and member-link states.
  4. Correlate LACP timeout, VSX peer recovery and client packet-loss timestamps.

Explanation

Correct Answer

A:

This check collects evidence at the layer implicated by the symptom: a physical Layer 2 loop can repeatedly replicate flooded frames and saturate the segment. Examine the evidence before choosing the corrective change.

Incorrect Answers

B:

This would be a reasonable check when two VSX peers advertise a default gateway, but client MAC learning oscillates after the peers use inconsistent active-gateway MAC addresses, but is less direct for the issue at hand: a physical Layer 2 loop can repeatedly replicate flooded frames and saturate the segment.

C:

This would be a reasonable check when a VSF stack has members connected in a line, so one intermember cable failure isolates the last unit, but is less direct for the issue at hand: a physical Layer 2 loop can repeatedly replicate flooded frames and saturate the segment.

D:

This would be a reasonable check when a VSX peer restarts for an upgrade and port-channel traffic drops because the downstream LACP timeout is too strict for the expected convergence, but is less direct for the issue at hand: a physical Layer 2 loop can repeatedly replicate flooded frames and saturate the segment.

Question 839

Two redundant switches disagree about the device that should be the STP root for a campus distribution VLAN. Which first diagnostic check is most useful before changing the network?

  1. Inspect bridge IDs and root port selection from both switches.
  2. Inspect the port disable reason and BPDU-reception counter.
  3. Compare active-gateway configuration and ARP responses across both peers.
  4. Read LACP system IDs from both upstream peers and compare them.

Explanation

Correct Answer

A:

This check collects evidence at the layer implicated by the symptom: an unintended bridge root can steer traffic into a fragile or suboptimal topology. Examine the evidence before choosing the corrective change.

Incorrect Answers

B:

This would be a reasonable check when a switch receives BPDUs on an access edge configured with BPDU protection and disables the port, but is less direct for the issue at hand: an unintended bridge root can steer traffic into a fragile or suboptimal topology.

C:

This would be a reasonable check when two VSX peers advertise a default gateway, but client MAC learning oscillates after the peers use inconsistent active-gateway MAC addresses, but is less direct for the issue at hand: an unintended bridge root can steer traffic into a fragile or suboptimal topology.

D:

This would be a reasonable check when an edge switch's LACP bundle connects to two independent devices that are not configured as a VSX or equivalent multichassis domain, but is less direct for the issue at hand: an unintended bridge root can steer traffic into a fragile or suboptimal topology.

Question 840

A stack's standby control member cannot take over after a failover drill because the new member has incompatible firmware. Which first diagnostic check is most useful before changing the network?

  1. Inspect the port disable reason and BPDU-reception counter.
  2. Inspect per-member software and join-rejection logs.
  3. Inspect VSX peer, ISL and keepalive health individually.
  4. Inspect bridge IDs and root port selection from both switches.

Explanation

Correct Answer

B:

This check collects evidence at the layer implicated by the symptom: control-member version mismatch prevents stable participation in the intended logical stack. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when a switch receives BPDUs on an access edge configured with BPDU protection and disables the port, but is less direct for the issue at hand: control-member version mismatch prevents stable participation in the intended logical stack.

C:

This would be a reasonable check when a VSX pair loses its inter-switch link and the team assumes the remaining keepalive alone carries user traffic between peers, but is less direct for the issue at hand: control-member version mismatch prevents stable participation in the intended logical stack.

D:

This would be a reasonable check when two redundant switches disagree about the device that should be the STP root for a campus distribution VLAN, but is less direct for the issue at hand: control-member version mismatch prevents stable participation in the intended logical stack.