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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 25

Question 240

A stack's standby control member cannot take over after a failover drill because the new member has incompatible firmware. Which failure mechanism best explains the observed behavior?

  1. Hosts pointing to a physical router address cannot benefit from VRRP gateway movement.
  2. Control-member version mismatch prevents stable participation in the intended logical stack.
  3. A linear stacking topology leaves a single path to the last member.
  4. Redundant hardware can mask a failure unless power-supply status is monitored.

Explanation

Correct Answer

B:

The symptoms fit this mechanism. A targeted response is to align software versions through the vendor-supported stack upgrade and member compatibility process, followed by verification that all members join the stack and leadership failover completes without losing the remaining access members.

Incorrect Answers

A:

That explanation fits a different case, such as when a campus uses VRRP on an SVI but hosts keep targeting a physical gateway address rather than the shared virtual address. The symptoms here are better explained by control-member version mismatch prevents stable participation in the intended logical stack.

C:

That explanation fits a different case, such as when a VSF stack has members connected in a line, so one intermember cable failure isolates the last unit. The symptoms here are better explained by control-member version mismatch prevents stable participation in the intended logical stack.

D:

That explanation fits a different case, such as when a core switch keeps forwarding after a power supply is removed, but a maintenance exercise shows no power fault alarm reaches operations. The symptoms here are better explained by control-member version mismatch prevents stable participation in the intended logical stack.

Question 241

A new finance printer is connected to an access port in VLAN 130, but the subnet gateway is an SVI in VLAN 120. Which failure mechanism best explains the observed behavior?

  1. Unrestricted DHCP server responses on an access port can assign clients an incorrect default route.
  2. Access VLAN membership does not match the subnet selected for that endpoint.
  3. Without membership-based snooping, multicast may be flooded like unknown traffic.
  4. Mismatched MST region parameters prevent consistent intended spanning-tree instance behavior.

Explanation

Correct Answer

B:

The symptoms fit this mechanism. A targeted response is to move the port to the approved finance VLAN and ensure the correct SVI and DHCP scope are used, followed by verification that the printer obtains an address in the approved subnet and communicates via its intended SVI.

Incorrect Answers

A:

That explanation fits a different case, such as when a rogue small office router begins answering DHCP on an open desk port. The symptoms here are better explained by access VLAN membership does not match the subnet selected for that endpoint.

C:

That explanation fits a different case, such as when a multicast video stream floods every port in a VLAN after an IGMP snooping feature is disabled. The symptoms here are better explained by access VLAN membership does not match the subnet selected for that endpoint.

D:

That explanation fits a different case, such as when a newly enabled MSTP configuration blocks the wrong uplink because two switches assign VLANs to inconsistent instances. The symptoms here are better explained by access VLAN membership does not match the subnet selected for that endpoint.

Question 242

An AP trunk has every VLAN enabled, allowing guest client traffic onto a restricted internal network. Which failure mechanism best explains the observed behavior?

  1. Inconsistent peer-side LAG settings can create asymmetric forwarding after failover.
  2. Layer 2 broadcasts do not cross a routed VLAN boundary by default.
  3. CRC errors indicate physical frame corruption rather than a VLAN-routing configuration error.
  4. An over-permissive tagged trunk undermines the intended segmentation boundary.

Explanation

Correct Answer

D:

The symptoms fit this mechanism. A targeted response is to restrict the trunk's allowed VLAN list to the management and WLAN client VLANs actually required, followed by verification that guest association still works but unapproved VLAN tags do not traverse the AP uplink.

Incorrect Answers

A:

That explanation fits a different case, 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. The symptoms here are better explained by an over-permissive tagged trunk undermines the intended segmentation boundary.

B:

That explanation fits a different case, such as when a classroom endpoint cannot see a local broadcast discovery service across two isolated VLANs. The symptoms here are better explained by an over-permissive tagged trunk undermines the intended segmentation boundary.

C:

That explanation fits a different case, such as when a switch trunk's CRC error counters climb while application traffic degrades after a fiber transceiver change. The symptoms here are better explained by an over-permissive tagged trunk undermines the intended segmentation boundary.

Question 243

A CX switch has a healthy SVI but hosts cannot reach the directly connected gateway because the VLAN has no active member ports. Which failure mechanism best explains the observed behavior?

  1. An SVI may remain ineffective when its underlying VLAN has no usable access connectivity.
  2. A Layer 2 network with parallel paths and no loop avoidance can replicate frames indefinitely.
  3. A static MAC location can override learning even after the host changes location.
  4. MAC-to-IP-to-port ownership is not enforced by ordinary VLAN isolation.

Explanation

Correct Answer

A:

The symptoms fit this mechanism. A targeted response is to restore the authorized member port and the VLAN's operational state, followed by verification that the SVI responds to clients on active member ports and ARP resolves correctly.

Incorrect Answers

B:

That explanation fits a different case, such as when a campus administrator disables STP globally to reduce convergence time, and a redundant link introduces a broadcast storm. The symptoms here are better explained by an SVI may remain ineffective when its underlying VLAN has no usable access connectivity.

C:

That explanation fits a different case, 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. The symptoms here are better explained by an SVI may remain ineffective when its underlying VLAN has no usable access connectivity.

D:

That explanation fits a different case, such as when an access network requires prevention of forged source-IP traffic from endpoints with stolen static addresses. The symptoms here are better explained by an SVI may remain ineffective when its underlying VLAN has no usable access connectivity.

Question 244

An 802.1Q trunk carries VLAN 20 untagged on one end and tagged on the other, causing intermittent DHCP placement. Which failure mechanism best explains the observed behavior?

  1. Access mode sends traffic for one untagged VLAN instead of carrying multiple tagged networks.
  2. The incorrect subnet boundary makes some intended local hosts appear remote or unreachable.
  3. An SVI may remain ineffective when its underlying VLAN has no usable access connectivity.
  4. The two peers disagree about how untagged Ethernet frames map to a VLAN.

Explanation

Correct Answer

D:

The symptoms fit this mechanism. A targeted response is to match native and tagged VLAN behavior on the trunk's two endpoints, followed by verification that DHCP broadcasts remain within the intended VLAN and the link's tag behavior is symmetric.

Incorrect Answers

A:

That explanation fits a different case, such as when a switch port connected to a hypervisor must carry three isolated tenant VLANs, but it is left in access mode. The symptoms here are better explained by the two peers disagree about how untagged Ethernet frames map to a VLAN.

B:

That explanation fits a different case, such as when a new Layer 3 switch hosts the user VLAN gateway but the SVI mask excludes part of the expected address range. The symptoms here are better explained by the two peers disagree about how untagged Ethernet frames map to a VLAN.

C:

That explanation fits a different case, 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. The symptoms here are better explained by the two peers disagree about how untagged Ethernet frames map to a VLAN.

Question 245

A file server connected by a LAG shows intermittent flows and one link is outside the port-channel. Which failure mechanism best explains the observed behavior?

  1. Sharing an SSID or VLAN does not by itself enforce group-level east-west restrictions.
  2. Mismatched MST region parameters prevent consistent intended spanning-tree instance behavior.
  3. A static MAC location can override learning even after the host changes location.
  4. One interface negotiates differently and is excluded from the logical forwarding group.

Explanation

Correct Answer

D:

The symptoms fit this mechanism. A targeted response is to align the member's LACP mode, speed and aggregator configuration with the intended LAG, followed by verification that all members show compatible LACP state and the server maintains connectivity during a member failure.

Incorrect Answers

A:

That explanation fits a different case, such as when a security requirement calls for isolating two guest groups inside one SSID, but both groups land in an unrestricted shared VLAN. The symptoms here are better explained by one interface negotiates differently and is excluded from the logical forwarding group.

B:

That explanation fits a different case, such as when a newly enabled MSTP configuration blocks the wrong uplink because two switches assign VLANs to inconsistent instances. The symptoms here are better explained by one interface negotiates differently and is excluded from the logical forwarding group.

C:

That explanation fits a different case, 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. The symptoms here are better explained by one interface negotiates differently and is excluded from the logical forwarding group.

Question 246

A classroom endpoint cannot see a local broadcast discovery service across two isolated VLANs. Which failure mechanism best explains the observed behavior?

  1. Duplicated unmanaged gateway IP ownership causes ARP instability and conflicting replies.
  2. Layer 2 broadcasts do not cross a routed VLAN boundary by default.
  3. An L3 SVI ACL may not inspect traffic that never traverses that routed interface.
  4. A Layer 2 network with parallel paths and no loop avoidance can replicate frames indefinitely.

Explanation

Correct Answer

B:

The symptoms fit this mechanism. A targeted response is to use an approved routed discovery relay or application gateway rather than merging the VLANs without review, followed by verification that the approved discovery application works through the relay while unrelated broadcasts remain separated.

Incorrect Answers

A:

That explanation fits a different case, 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. The symptoms here are better explained by Layer 2 broadcasts do not cross a routed VLAN boundary by default.

C:

That explanation fits a different case, such as 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. The symptoms here are better explained by Layer 2 broadcasts do not cross a routed VLAN boundary by default.

D:

That explanation fits a different case, such as when a campus administrator disables STP globally to reduce convergence time, and a redundant link introduces a broadcast storm. The symptoms here are better explained by Layer 2 broadcasts do not cross a routed VLAN boundary by default.

Question 247

A campus sees periodic MAC address moves between two access ports with no planned mobility. Which failure mechanism best explains the observed behavior?

  1. Unrestricted DHCP server responses on an access port can assign clients an incorrect default route.
  2. The configured client limit is narrower than the legitimate topology behind that port.
  3. A static MAC location can override learning even after the host changes location.
  4. Unexpected rapid MAC movement generally indicates multiple ingress paths for the same source.

Explanation

Correct Answer

D:

The symptoms fit this mechanism. A targeted response is to locate the accidental loop or duplicated Layer 2 attachment before changing MAC aging values, followed by verification that the MAC stays learned on the expected port with no flooding spike.

Incorrect Answers

A:

That explanation fits a different case, such as when a rogue small office router begins answering DHCP on an open desk port. The symptoms here are better explained by unexpected rapid MAC movement generally indicates multiple ingress paths for the same source.

B:

That explanation fits a different case, such as when an edge port has port-security configured for one device and a desk phone with a downstream PC is unexpectedly blocked. The symptoms here are better explained by unexpected rapid MAC movement generally indicates multiple ingress paths for the same source.

C:

That explanation fits a different case, 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. The symptoms here are better explained by unexpected rapid MAC movement generally indicates multiple ingress paths for the same source.

Question 248

A switch is configured with DHCP snooping, but legitimate lease offers arriving from the authorized DHCP uplink are dropped. Which failure mechanism best explains the observed behavior?

  1. A Layer 2 network with parallel paths and no loop avoidance can replicate frames indefinitely.
  2. A static MAC location can override learning even after the host changes location.
  3. Unexpected rapid MAC movement generally indicates multiple ingress paths for the same source.
  4. The legitimate offer arrives on an interface classified as untrusted by the snooping policy.

Explanation

Correct Answer

D:

The symptoms fit this mechanism. A targeted response is to trust only the authorized DHCP server-facing path and retain untrusted client access ports, followed by verification that clients receive leases from approved servers without accepting rogue offers from user ports.

Incorrect Answers

A:

That explanation fits a different case, such as when a campus administrator disables STP globally to reduce convergence time, and a redundant link introduces a broadcast storm. The symptoms here are better explained by the legitimate offer arrives on an interface classified as untrusted by the snooping policy.

B:

That explanation fits a different case, 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. The symptoms here are better explained by the legitimate offer arrives on an interface classified as untrusted by the snooping policy.

C:

That explanation fits a different case, such as when a campus sees periodic MAC address moves between two access ports with no planned mobility. The symptoms here are better explained by the legitimate offer arrives on an interface classified as untrusted by the snooping policy.

Question 249

A rogue small office router begins answering DHCP on an open desk port. Which failure mechanism best explains the observed behavior?

  1. Unrestricted DHCP server responses on an access port can assign clients an incorrect default route.
  2. An intermediate link has a smaller MTU than the application's required packet size.
  3. CRC errors indicate physical frame corruption rather than a VLAN-routing configuration error.
  4. A Layer 2 network with parallel paths and no loop avoidance can replicate frames indefinitely.

Explanation

Correct Answer

A:

The symptoms fit this mechanism. A targeted response is to apply DHCP snooping with trusted infrastructure ports and untrusted user edges, followed by verification that only authorized DHCP offers reach clients on the protected VLAN.

Incorrect Answers

B:

That explanation fits a different case, such as when a service requires large Ethernet payloads, but a path across several CX switches drops only oversized frames. The symptoms here are better explained by unrestricted DHCP server responses on an access port can assign clients an incorrect default route.

C:

That explanation fits a different case, such as when a switch trunk's CRC error counters climb while application traffic degrades after a fiber transceiver change. The symptoms here are better explained by unrestricted DHCP server responses on an access port can assign clients an incorrect default route.

D:

That explanation fits a different case, such as when a campus administrator disables STP globally to reduce convergence time, and a redundant link introduces a broadcast storm. The symptoms here are better explained by unrestricted DHCP server responses on an access port can assign clients an incorrect default route.

Question 250

An access network requires prevention of forged source-IP traffic from endpoints with stolen static addresses. Which failure mechanism best explains the observed behavior?

  1. An intermediate link has a smaller MTU than the application's required packet size.
  2. One interface negotiates differently and is excluded from the logical forwarding group.
  3. Unvalidated ARP claims can redirect traffic by associating gateway IPs with attacker MACs.
  4. MAC-to-IP-to-port ownership is not enforced by ordinary VLAN isolation.

Explanation

Correct Answer

D:

The symptoms fit this mechanism. A targeted response is to use IP source lockdown or an equivalent supported binding-enforcement control with correctly learned or approved bindings, followed by verification that packets with valid bindings pass and forged source IPs from user ports are blocked.

Incorrect Answers

A:

That explanation fits a different case, such as when a service requires large Ethernet payloads, but a path across several CX switches drops only oversized frames. The symptoms here are better explained by mAC-to-IP-to-port ownership is not enforced by ordinary VLAN isolation.

B:

That explanation fits a different case, such as when a file server connected by a LAG shows intermittent flows and one link is outside the port-channel. The symptoms here are better explained by mAC-to-IP-to-port ownership is not enforced by ordinary VLAN isolation.

C:

That explanation fits a different case, such as when a campus needs to reduce ARP spoofing from open lab ports, yet engineers plan to permit all ARP replies. The symptoms here are better explained by mAC-to-IP-to-port ownership is not enforced by ordinary VLAN isolation.