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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 86

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.

Question 851

An edge port has port-security configured for one device and a desk phone with a downstream PC is unexpectedly blocked. Which first diagnostic check is most useful before changing the network?

  1. Inspect flow distribution and per-member counters over the same interval.
  2. Trace whether discovery traffic is local broadcast, multicast or routable unicast.
  3. Check learned MAC counts and port-security violation logs.
  4. Inspect the management VRF's IPv6 forwarding table and SNMP source.

Explanation

Correct Answer

C:

This check collects evidence at the layer implicated by the symptom: the configured client limit is narrower than the legitimate topology behind that port. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

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: the configured client limit is narrower than the legitimate topology behind that port.

B:

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: the configured client limit is narrower than the legitimate topology behind that port.

D:

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 configured client limit is narrower than the legitimate topology behind that port.

Question 852

A multicast video stream floods every port in a VLAN after an IGMP snooping feature is disabled. Which first diagnostic check is most useful before changing the network?

  1. Compare MST configuration digests, region names and instance mappings.
  2. Compare the SVI address/mask with actual client prefixes and ARP behavior.
  3. Trace whether discovery traffic is local broadcast, multicast or routable unicast.
  4. Inspect IGMP group tables, querier state and multicast interface counters.

Explanation

Correct Answer

D:

This check collects evidence at the layer implicated by the symptom: without membership-based snooping, multicast may be flooded like unknown traffic. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when a newly enabled MSTP configuration blocks the wrong uplink because two switches assign VLANs to inconsistent instances, but is less direct for the issue at hand: without membership-based snooping, multicast may be flooded like unknown traffic.

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: without membership-based snooping, multicast may be flooded like unknown traffic.

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: without membership-based snooping, multicast may be flooded like unknown traffic.

Question 853

A newly enabled MSTP configuration blocks the wrong uplink because two switches assign VLANs to inconsistent instances. Which first diagnostic check is most useful before changing the network?

  1. Compare transceiver diagnostics and interface CRC error rates.
  2. Compare MST configuration digests, region names and instance mappings.
  3. Compare effective multi-chassis LAG settings across the pair.
  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: mismatched MST region parameters prevent consistent intended spanning-tree instance behavior. 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: mismatched MST region parameters prevent consistent intended spanning-tree instance behavior.

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: mismatched MST region parameters prevent consistent intended spanning-tree instance behavior.

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: mismatched MST region parameters prevent consistent intended spanning-tree instance behavior.

Question 854

A campus administrator disables STP globally to reduce convergence time, and a redundant link introduces a broadcast storm. Which first diagnostic check is most useful before changing the network?

  1. Inspect MAC aging timers, learned entries and flooding counters.
  2. Inspect active L2 physical paths and STP role or loop-protection events.
  3. Inspect flow distribution and per-member counters over the same interval.
  4. Compare the SVI address/mask with actual client prefixes and ARP behavior.

Explanation

Correct Answer

B:

This check collects evidence at the layer implicated by the symptom: a Layer 2 network with parallel paths and no loop avoidance can replicate frames indefinitely. 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: a Layer 2 network with parallel paths and no loop avoidance can replicate frames indefinitely.

C:

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: a Layer 2 network with parallel paths and no loop avoidance can replicate frames indefinitely.

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: a Layer 2 network with parallel paths and no loop avoidance can replicate frames indefinitely.

Question 855

A service requires large Ethernet payloads, but a path across several CX switches drops only oversized frames. Which first diagnostic check is most useful before changing the network?

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

Explanation

Correct Answer

C:

This check collects evidence at the layer implicated by the symptom: an intermediate link has a smaller MTU than the application's required packet size. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

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: an intermediate link has a smaller MTU than the application's required packet size.

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: an intermediate link has a smaller MTU than the application's required packet size.

D:

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: an intermediate link has a smaller MTU than the application's required packet size.

Question 856

A switch port connected to a hypervisor must carry three isolated tenant VLANs, but it is left in access mode. Which first diagnostic check is most useful before changing the network?

  1. Inspect IGMP group tables, querier state and multicast interface counters.
  2. Inspect the port's mode and tagged VLAN membership alongside host vSwitch settings.
  3. Inspect VLAN operational state, member interfaces and local ARP entries.
  4. Inspect MAC aging timers, learned entries and flooding counters.

Explanation

Correct Answer

B:

This check collects evidence at the layer implicated by the symptom: access mode sends traffic for one untagged VLAN instead of carrying multiple tagged networks. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

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: access mode sends traffic for one untagged VLAN instead of carrying multiple tagged networks.

C:

This would be a reasonable check when a CX switch has a healthy SVI but hosts cannot reach the directly connected gateway because the VLAN has no active member ports, but is less direct for the issue at hand: access mode sends traffic for one untagged VLAN instead of carrying multiple tagged networks.

D:

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: access mode sends traffic for one untagged VLAN instead of carrying multiple tagged networks.

Question 857

A campus uses static MAC entries for critical systems, but after an authorized server relocation traffic still forwards to the old port. 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. Compare the SVI address/mask with actual client prefixes and ARP behavior.
  4. Inspect static and dynamic MAC table records for the server's MAC.

Explanation

Correct Answer

D:

This check collects evidence at the layer implicated by the symptom: a static MAC location can override learning even after the host changes location. 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: a static MAC location can override learning even after the host changes location.

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: a static MAC location can override learning even after the host changes location.

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: a static MAC location can override learning even after the host changes location.

Question 858

A new Layer 3 switch hosts the user VLAN gateway but the SVI mask excludes part of the expected address range. Which first diagnostic check is most useful before changing the network?

  1. Compare the SVI address/mask with actual client prefixes and ARP behavior.
  2. Inspect learned DHCP snooping bindings and source-lockdown drop counters.
  3. Compare MST configuration digests, region names and instance mappings.
  4. Compare transceiver diagnostics and interface CRC error rates.

Explanation

Correct Answer

A:

This check collects evidence at the layer implicated by the symptom: the incorrect subnet boundary makes some intended local hosts appear remote or unreachable. Examine the evidence before choosing the corrective change.

Incorrect Answers

B:

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 incorrect subnet boundary makes some intended local hosts appear remote or unreachable.

C:

This would be a reasonable check when a newly enabled MSTP configuration blocks the wrong uplink because two switches assign VLANs to inconsistent instances, but is less direct for the issue at hand: the incorrect subnet boundary makes some intended local hosts appear remote or unreachable.

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: the incorrect subnet boundary makes some intended local hosts appear remote or unreachable.

Question 859

A campus needs to reduce ARP spoofing from open lab ports, yet engineers plan to permit all ARP replies. Which first diagnostic check is most useful before changing the network?

  1. Inspect IGMP group tables, querier state and multicast interface counters.
  2. Compare the SVI address/mask with actual client prefixes and ARP behavior.
  3. Capture DHCPOFFER traffic and inspect the switch's snooping counters.
  4. Capture conflicting ARP claims and inspect address-binding records.

Explanation

Correct Answer

D:

This check collects evidence at the layer implicated by the symptom: unvalidated ARP claims can redirect traffic by associating gateway IPs with attacker MACs. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

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: unvalidated ARP claims can redirect traffic by associating gateway IPs with attacker MACs.

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: unvalidated ARP claims can redirect traffic by associating gateway IPs with attacker MACs.

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: unvalidated ARP claims can redirect traffic by associating gateway IPs with attacker MACs.

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.