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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 66

Question 650

An access network requires prevention of forged source-IP traffic from endpoints with stolen static addresses. Which ongoing operational safeguard best reduces the chance of recurrence?

  1. Audit binding table sources and static-device exceptions.
  2. Document LAG per-flow load-distribution expectations in capacity forecasts.
  3. Include IPv6 management routes in dual-stack change templates.
  4. Require VSX LAG configuration consistency checks before change approval.

Explanation

Correct Answer

A:

This is a continuing control for the failure mode in which mAC-to-IP-to-port ownership is not enforced by ordinary VLAN isolation. It complements the immediate fix instead of relying on a one-off correction.

Incorrect Answers

B:

That control is useful for a different failure, such as when a LAG uses a hash selection that causes one large storage flow to occupy a single member while other links remain mostly idle. It would leave the present failure mode insufficiently addressed.

C:

That control is useful for a different failure, such as 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. It would leave the present failure mode insufficiently addressed.

D:

That control is useful for a different failure, such as when a VSX downstream switch has an active multi-chassis LAG, but the primary and secondary peers disagree on the permitted client VLANs. It would leave the present failure mode insufficiently addressed.

Question 651

An edge port has port-security configured for one device and a desk phone with a downstream PC is unexpectedly blocked. Which ongoing operational safeguard best reduces the chance of recurrence?

  1. Review trunk allow lists during AP and SSID changes.
  2. Document expected device counts and secure authentication mode for each endpoint class.
  3. Review DHCP trusted-port paths when changing topology.
  4. Maintain an explicit native-VLAN plan instead of relying on implicit defaults.

Explanation

Correct Answer

B:

This is a continuing control for the failure mode in which the configured client limit is narrower than the legitimate topology behind that port. It complements the immediate fix instead of relying on a one-off correction.

Incorrect Answers

A:

That control is useful for a different failure, such as when an AP trunk has every VLAN enabled, allowing guest client traffic onto a restricted internal network. It would leave the present failure mode insufficiently addressed.

C:

That control is useful for a different failure, such as when a switch is configured with DHCP snooping, but legitimate lease offers arriving from the authorized DHCP uplink are dropped. It would leave the present failure mode insufficiently addressed.

D:

That control is useful for a different failure, such as when an 802.1Q trunk carries VLAN 20 untagged on one end and tagged on the other, causing intermittent DHCP placement. It would leave the present failure mode insufficiently addressed.

Question 652

A multicast video stream floods every port in a VLAN after an IGMP snooping feature is disabled. Which ongoing operational safeguard best reduces the chance of recurrence?

  1. Maintain an explicit native-VLAN plan instead of relying on implicit defaults.
  2. Monitor querier presence and group membership after IPTV changes.
  3. Test DHCP relay reachability after VRF migrations.
  4. Include IPv6 management routes in dual-stack change templates.

Explanation

Correct Answer

B:

This is a continuing control for the failure mode in which without membership-based snooping, multicast may be flooded like unknown traffic. It complements the immediate fix instead of relying on a one-off correction.

Incorrect Answers

A:

That control is useful for a different failure, such as when an 802.1Q trunk carries VLAN 20 untagged on one end and tagged on the other, causing intermittent DHCP placement. It would leave the present failure mode insufficiently addressed.

C:

That control is useful for a different failure, such as when a client subnet uses an on-box DHCP relay but its requests never reach the centralized server after a VRF split. It would leave the present failure mode insufficiently addressed.

D:

That control is useful for a different failure, such as 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. It would leave the present failure mode insufficiently addressed.

Question 653

A newly enabled MSTP configuration blocks the wrong uplink because two switches assign VLANs to inconsistent instances. Which ongoing operational safeguard best reduces the chance of recurrence?

  1. Test DHCP relay reachability after VRF migrations.
  2. Include static forwarding table cleanup in change records for moved equipment.
  3. Version-control MST region mappings as a single campus standard.
  4. Keep cross-VLAN discovery exceptions narrowly documented.

Explanation

Correct Answer

C:

This is a continuing control for the failure mode in which mismatched MST region parameters prevent consistent intended spanning-tree instance behavior. It complements the immediate fix instead of relying on a one-off correction.

Incorrect Answers

A:

That control is useful for a different failure, such as when a client subnet uses an on-box DHCP relay but its requests never reach the centralized server after a VRF split. It would leave the present failure mode insufficiently addressed.

B:

That control is useful for a different failure, such as when a campus uses static MAC entries for critical systems, but after an authorized server relocation traffic still forwards to the old port. It would leave the present failure mode insufficiently addressed.

D:

That control is useful for a different failure, such as when a classroom endpoint cannot see a local broadcast discovery service across two isolated VLANs. It would leave the present failure mode insufficiently addressed.

Question 654

A campus administrator disables STP globally to reduce convergence time, and a redundant link introduces a broadcast storm. Which ongoing operational safeguard best reduces the chance of recurrence?

  1. Review DHCP trusted-port paths when changing topology.
  2. Keep binding enforcement and legitimate static-device exceptions documented.
  3. Require VSX LAG configuration consistency checks before change approval.
  4. Require loop-prevention approval for every Layer 2 redundancy change.

Explanation

Correct Answer

D:

This is a continuing control for the failure mode in which a Layer 2 network with parallel paths and no loop avoidance can replicate frames indefinitely. It complements the immediate fix instead of relying on a one-off correction.

Incorrect Answers

A:

That control is useful for a different failure, such as when a switch is configured with DHCP snooping, but legitimate lease offers arriving from the authorized DHCP uplink are dropped. It would leave the present failure mode insufficiently addressed.

B:

That control is useful for a different failure, such as when a campus needs to reduce ARP spoofing from open lab ports, yet engineers plan to permit all ARP replies. It would leave the present failure mode insufficiently addressed.

C:

That control is useful for a different failure, such as when a VSX downstream switch has an active multi-chassis LAG, but the primary and secondary peers disagree on the permitted client VLANs. It would leave the present failure mode insufficiently addressed.

Question 655

A service requires large Ethernet payloads, but a path across several CX switches drops only oversized frames. Which ongoing operational safeguard best reduces the chance of recurrence?

  1. Monitor MAC table occupancy and churn for high-density VLANs.
  2. Document MTU expectations across the entire service path.
  3. Track usable access members as part of SVI availability checks.
  4. Reserve gateway IPs and validate redundancy design before provisioning.

Explanation

Correct Answer

B:

This is a continuing control for the failure mode in which an intermediate link has a smaller MTU than the application's required packet size. It complements the immediate fix instead of relying on a one-off correction.

Incorrect Answers

A:

That control is useful for a different failure, such as when an access switch shows a large unknown-unicast flood after several upstream MAC addresses aged out too quickly. It would leave the present failure mode insufficiently addressed.

C:

That control is useful for a different failure, such as when a CX switch has a healthy SVI but hosts cannot reach the directly connected gateway because the VLAN has no active member ports. It would leave the present failure mode insufficiently addressed.

D:

That control is useful for a different failure, such as 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. It would leave the present failure mode insufficiently addressed.

Question 656

A switch port connected to a hypervisor must carry three isolated tenant VLANs, but it is left in access mode. Which ongoing operational safeguard best reduces the chance of recurrence?

  1. Alert on sustained MAC flapping and document dual-homing designs.
  2. Validate virtualization host VLAN mappings against switchport mode.
  3. Reserve gateway IPs and validate redundancy design before provisioning.
  4. Test DHCP relay reachability after VRF migrations.

Explanation

Correct Answer

B:

This is a continuing control for the failure mode in which access mode sends traffic for one untagged VLAN instead of carrying multiple tagged networks. It complements the immediate fix instead of relying on a one-off correction.

Incorrect Answers

A:

That control is useful for a different failure, such as when a campus sees periodic MAC address moves between two access ports with no planned mobility. It would leave the present failure mode insufficiently addressed.

C:

That control is useful for a different failure, such as 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. It would leave the present failure mode insufficiently addressed.

D:

That control is useful for a different failure, such as when a client subnet uses an on-box DHCP relay but its requests never reach the centralized server after a VRF split. It would leave the present failure mode insufficiently addressed.

Question 657

A campus uses static MAC entries for critical systems, but after an authorized server relocation traffic still forwards to the old port. Which ongoing operational safeguard best reduces the chance of recurrence?

  1. Include static forwarding table cleanup in change records for moved equipment.
  2. Reserve gateway IPs and validate redundancy design before provisioning.
  3. Track approved optic types and cable reach by platform.
  4. Validate LAG member compatibility before moving server links.

Explanation

Correct Answer

A:

This is a continuing control for the failure mode in which a static MAC location can override learning even after the host changes location. It complements the immediate fix instead of relying on a one-off correction.

Incorrect Answers

B:

That control is useful for a different failure, such as 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. It would leave the present failure mode insufficiently addressed.

C:

That control is useful for a different failure, such as when a switch trunk's CRC error counters climb while application traffic degrades after a fiber transceiver change. It would leave the present failure mode insufficiently addressed.

D:

That control is useful for a different failure, such as when a file server connected by a LAG shows intermittent flows and one link is outside the port-channel. It would leave the present failure mode insufficiently addressed.

Question 658

A new Layer 3 switch hosts the user VLAN gateway but the SVI mask excludes part of the expected address range. Which ongoing operational safeguard best reduces the chance of recurrence?

  1. Review DHCP trusted-port paths when changing topology.
  2. Version-control MST region mappings as a single campus standard.
  3. Document expected device counts and secure authentication mode for each endpoint class.
  4. Cross-check subnet calculations before SVI deployments.

Explanation

Correct Answer

D:

This is a continuing control for the failure mode in which the incorrect subnet boundary makes some intended local hosts appear remote or unreachable. It complements the immediate fix instead of relying on a one-off correction.

Incorrect Answers

A:

That control is useful for a different failure, such as when a switch is configured with DHCP snooping, but legitimate lease offers arriving from the authorized DHCP uplink are dropped. It would leave the present failure mode insufficiently addressed.

B:

That control is useful for a different failure, such as when a newly enabled MSTP configuration blocks the wrong uplink because two switches assign VLANs to inconsistent instances. It would leave the present failure mode insufficiently addressed.

C:

That control is useful for a different failure, such as when an edge port has port-security configured for one device and a desk phone with a downstream PC is unexpectedly blocked. It would leave the present failure mode insufficiently addressed.

Question 659

A campus needs to reduce ARP spoofing from open lab ports, yet engineers plan to permit all ARP replies. Which ongoing operational safeguard best reduces the chance of recurrence?

  1. Alert on sustained MAC flapping and document dual-homing designs.
  2. Validate virtualization host VLAN mappings against switchport mode.
  3. Keep binding enforcement and legitimate static-device exceptions documented.
  4. Document LAG per-flow load-distribution expectations in capacity forecasts.

Explanation

Correct Answer

C:

This is a continuing control for the failure mode in which unvalidated ARP claims can redirect traffic by associating gateway IPs with attacker MACs. It complements the immediate fix instead of relying on a one-off correction.

Incorrect Answers

A:

That control is useful for a different failure, such as when a campus sees periodic MAC address moves between two access ports with no planned mobility. It would leave the present failure mode insufficiently addressed.

B:

That control is useful for a different failure, such as when a switch port connected to a hypervisor must carry three isolated tenant VLANs, but it is left in access mode. It would leave the present failure mode insufficiently addressed.

D:

That control is useful for a different failure, such as when a LAG uses a hash selection that causes one large storage flow to occupy a single member while other links remain mostly idle. It would leave the present failure mode insufficiently addressed.

Question 660

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 ongoing operational safeguard best reduces the chance of recurrence?

  1. Track approved optic types and cable reach by platform.
  2. Map each policy requirement to the actual transit and enforcement layer.
  3. Require VSX LAG configuration consistency checks before change approval.
  4. Maintain an explicit native-VLAN plan instead of relying on implicit defaults.

Explanation

Correct Answer

B:

This is a continuing control for the failure mode in which an L3 SVI ACL may not inspect traffic that never traverses that routed interface. It complements the immediate fix instead of relying on a one-off correction.

Incorrect Answers

A:

That control is useful for a different failure, such as when a switch trunk's CRC error counters climb while application traffic degrades after a fiber transceiver change. It would leave the present failure mode insufficiently addressed.

C:

That control is useful for a different failure, such as when a VSX downstream switch has an active multi-chassis LAG, but the primary and secondary peers disagree on the permitted client VLANs. It would leave the present failure mode insufficiently addressed.

D:

That control is useful for a different failure, such as when an 802.1Q trunk carries VLAN 20 untagged on one end and tagged on the other, causing intermittent DHCP placement. It would leave the present failure mode insufficiently addressed.