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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 87

Question 860

A distribution switch applies an ingress ACL to a routed SVI, but administrators expect it to block frames bridged only inside the same VLAN. Which first diagnostic check is most useful before changing the network?

  1. Inspect learned DHCP snooping bindings and source-lockdown drop counters.
  2. Compare the SVI address/mask with actual client prefixes and ARP behavior.
  3. Trace whether the tested flow is routed through the SVI or switched locally.
  4. Inspect snooping drop counters and trusted status on server and client interfaces.

Explanation

Correct Answer

C:

This check collects evidence at the layer implicated by the symptom: an L3 SVI ACL may not inspect traffic that never traverses that routed interface. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

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 L3 SVI ACL may not inspect traffic that never traverses that routed interface.

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: an L3 SVI ACL may not inspect traffic that never traverses that routed interface.

D:

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: an L3 SVI ACL may not inspect traffic that never traverses that routed interface.

Question 861

A client subnet uses an on-box DHCP relay but its requests never reach the centralized server after a VRF split. Which first diagnostic check is most useful before changing the network?

  1. Inspect the management VRF's IPv6 forwarding table and SNMP source.
  2. Inspect relay statistics, source-address selection and route lookup.
  3. Inspect the port's mode and tagged VLAN membership alongside host vSwitch settings.
  4. Inspect learned DHCP snooping bindings and source-lockdown drop counters.

Explanation

Correct Answer

B:

This check collects evidence at the layer implicated by the symptom: the relay packet cannot reach the approved DHCP server from its chosen forwarding table. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when a management interface is configured with an IPv6 address, but SNMPv3 traffic never leaves because its selected management VRF lacks an IPv6 default route, but is less direct for the issue at hand: the relay packet cannot reach the approved DHCP server from its chosen forwarding table.

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 relay packet cannot reach the approved DHCP server from its chosen forwarding table.

D:

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: the relay packet cannot reach the approved DHCP server from its chosen forwarding table.

Question 862

A switch trunk's CRC error counters climb while application traffic degrades after a fiber transceiver change. Which first diagnostic check is most useful before changing the network?

  1. Inspect MAC aging timers, learned entries and flooding counters.
  2. Compare observed tagged frames against the approved SSID-to-VLAN inventory.
  3. Compare transceiver diagnostics and interface CRC error rates.
  4. Inspect static and dynamic MAC table records for the server's MAC.

Explanation

Correct Answer

C:

This check collects evidence at the layer implicated by the symptom: CRC errors indicate physical frame corruption rather than a VLAN-routing configuration error. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when an access switch shows a large unknown-unicast flood after several upstream MAC addresses aged out too quickly, but is less direct for the issue at hand: CRC errors indicate physical frame corruption rather than a VLAN-routing configuration error.

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: CRC errors indicate physical frame corruption rather than a VLAN-routing configuration error.

D:

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: CRC errors indicate physical frame corruption rather than a VLAN-routing configuration error.

Question 863

A LAG uses a hash selection that causes one large storage flow to occupy a single member while other links remain mostly idle. Which first diagnostic check is most useful before changing the network?

  1. Send bounded DF test packets and inspect MTU-related drop counters.
  2. Capture conflicting ARP claims and inspect address-binding records.
  3. Inspect duplicate address logs and the MAC addresses answering ARP for that IP.
  4. Inspect flow distribution and per-member counters over the same interval.

Explanation

Correct Answer

D:

This check collects evidence at the layer implicated by the symptom: conventional Ethernet LAG hashing normally keeps a single flow on one member to preserve ordering. 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: conventional Ethernet LAG hashing normally keeps a single flow on one member to preserve ordering.

B:

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: conventional Ethernet LAG hashing normally keeps a single flow on one member to preserve ordering.

C:

This would be a reasonable check when an engineer configures a VLAN SVI for default gateway service but accidentally assigns the same IPv4 address to another independent router without VRRP or active-gateway design, but is less direct for the issue at hand: conventional Ethernet LAG hashing normally keeps a single flow on one member to preserve ordering.

Question 864

A security requirement calls for isolating two guest groups inside one SSID, but both groups land in an unrestricted shared VLAN. 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 flow distribution and per-member counters over the same interval.
  3. Send bounded DF test packets and inspect MTU-related drop counters.
  4. Inspect applied user roles and effective access-control rules for both clients.

Explanation

Correct Answer

D:

This check collects evidence at the layer implicated by the symptom: sharing an SSID or VLAN does not by itself enforce group-level east-west restrictions. 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: sharing an SSID or VLAN does not by itself enforce group-level east-west restrictions.

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: sharing an SSID or VLAN does not by itself enforce group-level east-west restrictions.

C:

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: sharing an SSID or VLAN does not by itself enforce group-level east-west restrictions.

Question 865

A management interface is configured with an IPv6 address, but SNMPv3 traffic never leaves because its selected management VRF lacks an IPv6 default route. 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 partner identifiers and member synchronization flags.
  3. Inspect the management VRF's IPv6 forwarding table and SNMP source.
  4. Compare the SVI address/mask with actual client prefixes and ARP behavior.

Explanation

Correct Answer

C:

This check collects evidence at the layer implicated by the symptom: the management routing table has no IPv6 path to the collector. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

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: the management routing table has no IPv6 path to the collector.

B:

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: the management routing table has no IPv6 path to the collector.

D:

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: the management routing table has no IPv6 path to the collector.

Question 866

An access switch shows a large unknown-unicast flood after several upstream MAC addresses aged out too quickly. Which first diagnostic check is most useful before changing the network?

  1. Inspect MAC aging timers, learned entries and flooding counters.
  2. Inspect duplicate address logs and the MAC addresses answering ARP for that IP.
  3. Compare observed tagged frames against the approved SSID-to-VLAN inventory.
  4. Compare transceiver diagnostics and interface CRC error rates.

Explanation

Correct Answer

A:

This check collects evidence at the layer implicated by the symptom: aged-out destinations cause Layer 2 unknown-unicast flooding until relearned. Examine the evidence before choosing the corrective change.

Incorrect Answers

B:

This would be a reasonable check when an engineer configures a VLAN SVI for default gateway service but accidentally assigns the same IPv4 address to another independent router without VRRP or active-gateway design, but is less direct for the issue at hand: aged-out destinations cause Layer 2 unknown-unicast flooding until relearned.

C:

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: aged-out destinations cause Layer 2 unknown-unicast flooding until relearned.

D:

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: aged-out destinations cause Layer 2 unknown-unicast flooding until relearned.

Question 867

A VSX downstream switch has an active multi-chassis LAG, but the primary and secondary peers disagree on the permitted client VLANs. Which first diagnostic check is most useful before changing the network?

  1. Inspect MAC aging timers, learned entries and flooding counters.
  2. Inspect IGMP group tables, querier state and multicast interface counters.
  3. Inspect active L2 physical paths and STP role or loop-protection events.
  4. Compare effective multi-chassis LAG settings across the pair.

Explanation

Correct Answer

D:

This check collects evidence at the layer implicated by the symptom: inconsistent peer-side LAG settings can create asymmetric forwarding after failover. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when an access switch shows a large unknown-unicast flood after several upstream MAC addresses aged out too quickly, but is less direct for the issue at hand: inconsistent peer-side LAG settings can create asymmetric forwarding after failover.

B:

This would be a reasonable check when a multicast video stream floods every port in a VLAN after an IGMP snooping feature is disabled, but is less direct for the issue at hand: inconsistent peer-side LAG settings can create asymmetric forwarding after failover.

C:

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: inconsistent peer-side LAG settings can create asymmetric forwarding after failover.

Question 868

An engineer configures a VLAN SVI for default gateway service but accidentally assigns the same IPv4 address to another independent router without VRRP or active-gateway design. 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 duplicate address logs and the MAC addresses answering ARP for that IP.
  3. Capture DHCPOFFER traffic and inspect the switch's snooping counters.
  4. Trace whether discovery traffic is local broadcast, multicast or routable unicast.

Explanation

Correct Answer

B:

This check collects evidence at the layer implicated by the symptom: duplicated unmanaged gateway IP ownership causes ARP instability and conflicting replies. 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: duplicated unmanaged gateway IP ownership causes ARP instability and conflicting replies.

C:

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: duplicated unmanaged gateway IP ownership causes ARP instability and conflicting replies.

D:

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: duplicated unmanaged gateway IP ownership causes ARP instability and conflicting replies.

Question 869

A hospital's staff WLAN has strong signal near APs but frequent retries in a wing where two adjacent APs use the same busy 2.4 GHz channel. Which first diagnostic check is most useful before changing the network?

  1. Compare AP map positions with physical survey notes and calibration readings.
  2. Capture probe and association exchanges for the failed client.
  3. Inspect channel assignments, utilization, retry rate and nearby BSSIDs.
  4. Check the scanner's supported 802.11 bands and AP radio configuration.

Explanation

Correct Answer

C:

This check collects evidence at the layer implicated by the symptom: co-channel contention in a shared 2.4 GHz channel increases airtime competition even with strong signal. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when a warehouse deployment needs accurate client location, but APs were installed with no stable coordinate or floor map assignment, but is less direct for the issue at hand: co-channel contention in a shared 2.4 GHz channel increases airtime competition even with strong signal.

B:

This would be a reasonable check when a client station repeatedly attempts to join a hidden SSID but technicians attribute its failure solely to low signal, but is less direct for the issue at hand: co-channel contention in a shared 2.4 GHz channel increases airtime competition even with strong signal.

D:

This would be a reasonable check when a warehouse WLAN assigns every radio to 5 GHz, leaving legacy scanners that support only 2.4 GHz unable to join, but is less direct for the issue at hand: co-channel contention in a shared 2.4 GHz channel increases airtime competition even with strong signal.

Question 870

An office installs a new 6 GHz-capable AP, but an older 802.11ac laptop cannot detect the dedicated 6 GHz-only SSID. Which first diagnostic check is most useful before changing the network?

  1. Capture neighbor report requests and responses during a controlled roam.
  2. Inspect EAP-TLS failure reason and the new server certificate chain.
  3. Compare client association history, AP power and cell-edge data rates.
  4. Inspect the client radio's supported bands and the AP's enabled SSID bands.

Explanation

Correct Answer

D:

This check collects evidence at the layer implicated by the symptom: a 5 GHz-only 802.11ac radio cannot discover or join a 6 GHz WLAN. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when a location-aware application cannot find good roam candidates although coverage overlaps because neighbor information is missing, but is less direct for the issue at hand: a 5 GHz-only 802.11ac radio cannot discover or join a 6 GHz WLAN.

B:

This would be a reasonable check when an employee WLAN uses EAP-TLS and clients fail immediately after a RADIUS server certificate renewal, but is less direct for the issue at hand: a 5 GHz-only 802.11ac radio cannot discover or join a 6 GHz WLAN.

C:

This would be a reasonable check when the campus WLAN's APs transmit at maximum power, creating very large overlapping cells and sticky client behavior, but is less direct for the issue at hand: a 5 GHz-only 802.11ac radio cannot discover or join a 6 GHz WLAN.