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HP HPE7-A01 Bundle

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 85

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.

Question 841

A new finance printer is connected to an access port in VLAN 130, but the subnet gateway is an SVI in VLAN 120. Which first diagnostic check is most useful before changing the network?

  1. Inspect active L2 physical paths and STP role or loop-protection events.
  2. Compare the SVI address/mask with actual client prefixes and ARP behavior.
  3. Inspect snooping drop counters and trusted status on server and client interfaces.
  4. Inspect interface VLAN membership and the printer's assigned gateway.

Explanation

Correct Answer

D:

This check collects evidence at the layer implicated by the symptom: access VLAN membership does not match the subnet selected for that endpoint. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when a campus administrator disables STP globally to reduce convergence time, and a redundant link introduces a broadcast storm, but is less direct for the issue at hand: access VLAN membership does not match the subnet selected for that endpoint.

B:

This would be a reasonable check when a new Layer 3 switch hosts the user VLAN gateway but the SVI mask excludes part of the expected address range, but is less direct for the issue at hand: access VLAN membership does not match the subnet selected for that endpoint.

C:

This would be a reasonable check when a switch is configured with DHCP snooping, but legitimate lease offers arriving from the authorized DHCP uplink are dropped, but is less direct for the issue at hand: access VLAN membership does not match the subnet selected for that endpoint.

Question 842

An AP trunk has every VLAN enabled, allowing guest client traffic onto a restricted internal network. Which first diagnostic check is most useful before changing the network?

  1. Compare observed tagged frames against the approved SSID-to-VLAN inventory.
  2. Inspect MAC address-table move events and the physical endpoint topology.
  3. Inspect learned DHCP snooping bindings and source-lockdown drop counters.
  4. Check learned MAC counts and port-security violation logs.

Explanation

Correct Answer

A:

This check collects evidence at the layer implicated by the symptom: an over-permissive tagged trunk undermines the intended segmentation boundary. Examine the evidence before choosing the corrective change.

Incorrect Answers

B:

This would be a reasonable check when a campus sees periodic MAC address moves between two access ports with no planned mobility, but is less direct for the issue at hand: an over-permissive tagged trunk undermines the intended segmentation boundary.

C:

This would be a reasonable check when an access network requires prevention of forged source-IP traffic from endpoints with stolen static addresses, but is less direct for the issue at hand: an over-permissive tagged trunk undermines the intended segmentation boundary.

D:

This would be a reasonable check when an edge port has port-security configured for one device and a desk phone with a downstream PC is unexpectedly blocked, but is less direct for the issue at hand: an over-permissive tagged trunk undermines the intended segmentation boundary.

Question 843

A CX switch has a healthy SVI but hosts cannot reach the directly connected gateway because the VLAN has no active member ports. Which first diagnostic check is most useful before changing the network?

  1. Trace whether the tested flow is routed through the SVI or switched locally.
  2. Inspect VLAN operational state, member interfaces and local ARP entries.
  3. Trace whether discovery traffic is local broadcast, multicast or routable unicast.
  4. Inspect active L2 physical paths and STP role or loop-protection events.

Explanation

Correct Answer

B:

This check collects evidence at the layer implicated by the symptom: an SVI may remain ineffective when its underlying VLAN has no usable access connectivity. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when a distribution switch applies an ingress ACL to a routed SVI, but administrators expect it to block frames bridged only inside the same VLAN, but is less direct for the issue at hand: an SVI may remain ineffective when its underlying VLAN has no usable access connectivity.

C:

This would be a reasonable check when a classroom endpoint cannot see a local broadcast discovery service across two isolated VLANs, but is less direct for the issue at hand: an SVI may remain ineffective when its underlying VLAN has no usable access connectivity.

D:

This would be a reasonable check when a campus administrator disables STP globally to reduce convergence time, and a redundant link introduces a broadcast storm, but is less direct for the issue at hand: an SVI may remain ineffective when its underlying VLAN has no usable access connectivity.

Question 844

An 802.1Q trunk carries VLAN 20 untagged on one end and tagged on the other, causing intermittent DHCP placement. Which first diagnostic check is most useful before changing the network?

  1. Capture untagged and tagged frames at the affected trunk.
  2. Check learned MAC counts and port-security violation logs.
  3. Inspect interface VLAN membership and the printer's assigned gateway.
  4. Capture DHCPOFFER traffic and inspect the switch's snooping counters.

Explanation

Correct Answer

A:

This check collects evidence at the layer implicated by the symptom: the two peers disagree about how untagged Ethernet frames map to a VLAN. Examine the evidence before choosing the corrective change.

Incorrect Answers

B:

This would be a reasonable check when an edge port has port-security configured for one device and a desk phone with a downstream PC is unexpectedly blocked, but is less direct for the issue at hand: the two peers disagree about how untagged Ethernet frames map to a VLAN.

C:

This would be a reasonable check when a new finance printer is connected to an access port in VLAN 130, but the subnet gateway is an SVI in VLAN 120, but is less direct for the issue at hand: the two peers disagree about how untagged Ethernet frames map to a VLAN.

D:

This would be a reasonable check when a rogue small office router begins answering DHCP on an open desk port, but is less direct for the issue at hand: the two peers disagree about how untagged Ethernet frames map to a VLAN.

Question 845

A file server connected by a LAG shows intermittent flows and one link is outside the port-channel. Which first diagnostic check is most useful before changing the network?

  1. Inspect partner identifiers and member synchronization flags.
  2. Inspect static and dynamic MAC table records for the server's MAC.
  3. Compare the SVI address/mask with actual client prefixes and ARP behavior.
  4. Check learned MAC counts and port-security violation logs.

Explanation

Correct Answer

A:

This check collects evidence at the layer implicated by the symptom: one interface negotiates differently and is excluded from the logical forwarding group. Examine the evidence before choosing the corrective change.

Incorrect Answers

B:

This would be a reasonable check when a campus uses static MAC entries for critical systems, but after an authorized server relocation traffic still forwards to the old port, but is less direct for the issue at hand: one interface negotiates differently and is excluded from the logical forwarding group.

C:

This would be a reasonable check when a new Layer 3 switch hosts the user VLAN gateway but the SVI mask excludes part of the expected address range, but is less direct for the issue at hand: one interface negotiates differently and is excluded from the logical forwarding group.

D:

This would be a reasonable check when an edge port has port-security configured for one device and a desk phone with a downstream PC is unexpectedly blocked, but is less direct for the issue at hand: one interface negotiates differently and is excluded from the logical forwarding group.

Question 846

A classroom endpoint cannot see a local broadcast discovery service across two isolated VLANs. Which first diagnostic check is most useful before changing the network?

  1. Inspect snooping drop counters and trusted status on server and client interfaces.
  2. Inspect flow distribution and per-member counters over the same interval.
  3. Compare effective multi-chassis LAG settings across the pair.
  4. Trace whether discovery traffic is local broadcast, multicast or routable unicast.

Explanation

Correct Answer

D:

This check collects evidence at the layer implicated by the symptom: Layer 2 broadcasts do not cross a routed VLAN boundary by default. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when a switch is configured with DHCP snooping, but legitimate lease offers arriving from the authorized DHCP uplink are dropped, but is less direct for the issue at hand: Layer 2 broadcasts do not cross a routed VLAN boundary by default.

B:

This would be a reasonable check when a LAG uses a hash selection that causes one large storage flow to occupy a single member while other links remain mostly idle, but is less direct for the issue at hand: Layer 2 broadcasts do not cross a routed VLAN boundary by default.

C:

This would be a reasonable check when a VSX downstream switch has an active multi-chassis LAG, but the primary and secondary peers disagree on the permitted client VLANs, but is less direct for the issue at hand: Layer 2 broadcasts do not cross a routed VLAN boundary by default.

Question 847

A campus sees periodic MAC address moves between two access ports with no planned mobility. Which first diagnostic check is most useful before changing the network?

  1. Compare transceiver diagnostics and interface CRC error rates.
  2. Compare observed tagged frames against the approved SSID-to-VLAN inventory.
  3. Capture conflicting ARP claims and inspect address-binding records.
  4. Inspect MAC address-table move events and the physical endpoint topology.

Explanation

Correct Answer

D:

This check collects evidence at the layer implicated by the symptom: unexpected rapid MAC movement generally indicates multiple ingress paths for the same source. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when a switch trunk's CRC error counters climb while application traffic degrades after a fiber transceiver change, but is less direct for the issue at hand: unexpected rapid MAC movement generally indicates multiple ingress paths for the same source.

B:

This would be a reasonable check when an AP trunk has every VLAN enabled, allowing guest client traffic onto a restricted internal network, but is less direct for the issue at hand: unexpected rapid MAC movement generally indicates multiple ingress paths for the same source.

C:

This would be a reasonable check when a campus needs to reduce ARP spoofing from open lab ports, yet engineers plan to permit all ARP replies, but is less direct for the issue at hand: unexpected rapid MAC movement generally indicates multiple ingress paths for the same source.

Question 848

A switch is configured with DHCP snooping, but legitimate lease offers arriving from the authorized DHCP uplink are dropped. Which first diagnostic check is most useful before changing the network?

  1. Inspect MAC address-table move events and the physical endpoint topology.
  2. Inspect snooping drop counters and trusted status on server and client interfaces.
  3. Inspect the port's mode and tagged VLAN membership alongside host vSwitch settings.
  4. Capture untagged and tagged frames at the affected trunk.

Explanation

Correct Answer

B:

This check collects evidence at the layer implicated by the symptom: the legitimate offer arrives on an interface classified as untrusted by the snooping policy. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when a campus sees periodic MAC address moves between two access ports with no planned mobility, but is less direct for the issue at hand: the legitimate offer arrives on an interface classified as untrusted by the snooping policy.

C:

This would be a reasonable check when a switch port connected to a hypervisor must carry three isolated tenant VLANs, but it is left in access mode, but is less direct for the issue at hand: the legitimate offer arrives on an interface classified as untrusted by the snooping policy.

D:

This would be a reasonable check when an 802.1Q trunk carries VLAN 20 untagged on one end and tagged on the other, causing intermittent DHCP placement, but is less direct for the issue at hand: the legitimate offer arrives on an interface classified as untrusted by the snooping policy.

Question 849

A rogue small office router begins answering DHCP on an open desk port. Which first diagnostic check is most useful before changing the network?

  1. Trace whether discovery traffic is local broadcast, multicast or routable unicast.
  2. Inspect interface VLAN membership and the printer's assigned gateway.
  3. Capture DHCPOFFER traffic and inspect the switch's snooping counters.
  4. Inspect partner identifiers and member synchronization flags.

Explanation

Correct Answer

C:

This check collects evidence at the layer implicated by the symptom: unrestricted DHCP server responses on an access port can assign clients an incorrect default route. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when a classroom endpoint cannot see a local broadcast discovery service across two isolated VLANs, but is less direct for the issue at hand: unrestricted DHCP server responses on an access port can assign clients an incorrect default route.

B:

This would be a reasonable check when a new finance printer is connected to an access port in VLAN 130, but the subnet gateway is an SVI in VLAN 120, but is less direct for the issue at hand: unrestricted DHCP server responses on an access port can assign clients an incorrect default route.

D:

This would be a reasonable check when a file server connected by a LAG shows intermittent flows and one link is outside the port-channel, but is less direct for the issue at hand: unrestricted DHCP server responses on an access port can assign clients an incorrect default route.

Question 850

An access network requires prevention of forged source-IP traffic from endpoints with stolen static addresses. Which first diagnostic check is most useful before changing the network?

  1. Send bounded DF test packets and inspect MTU-related drop counters.
  2. Inspect snooping drop counters and trusted status on server and client interfaces.
  3. Inspect partner identifiers and member synchronization flags.
  4. Inspect learned DHCP snooping bindings and source-lockdown drop counters.

Explanation

Correct Answer

D:

This check collects evidence at the layer implicated by the symptom: mAC-to-IP-to-port ownership is not enforced by ordinary VLAN isolation. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when a service requires large Ethernet payloads, but a path across several CX switches drops only oversized frames, but is less direct for the issue at hand: mAC-to-IP-to-port ownership is not enforced by ordinary VLAN isolation.

B:

This would be a reasonable check when a switch is configured with DHCP snooping, but legitimate lease offers arriving from the authorized DHCP uplink are dropped, but is less direct for the issue at hand: mAC-to-IP-to-port ownership is not enforced by ordinary VLAN isolation.

C:

This would be a reasonable check when a file server connected by a LAG shows intermittent flows and one link is outside the port-channel, but is less direct for the issue at hand: mAC-to-IP-to-port ownership is not enforced by ordinary VLAN isolation.