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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 27

Question 260

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 failure mechanism best explains the observed behavior?

  1. The incorrect subnet boundary makes some intended local hosts appear remote or unreachable.
  2. The configured client limit is narrower than the legitimate topology behind that port.
  3. An L3 SVI ACL may not inspect traffic that never traverses that routed interface.
  4. Duplicated unmanaged gateway IP ownership causes ARP instability and conflicting replies.

Explanation

Correct Answer

C:

The symptoms fit this mechanism. A targeted response is to choose the supported policy enforcement point for Layer 2 traffic instead of relying on an SVI routed ACL alone, followed by verification that the blocked same-VLAN flow fails while explicitly permitted traffic continues.

Incorrect Answers

A:

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

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

D:

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

Question 261

A client subnet uses an on-box DHCP relay but its requests never reach the centralized server after a VRF split. Which failure mechanism best explains the observed behavior?

  1. Unvalidated ARP claims can redirect traffic by associating gateway IPs with attacker MACs.
  2. The relay packet cannot reach the approved DHCP server from its chosen forwarding table.
  3. Layer 2 broadcasts do not cross a routed VLAN boundary by default.
  4. Without membership-based snooping, multicast may be flooded like unknown traffic.

Explanation

Correct Answer

B:

The symptoms fit this mechanism. A targeted response is to configure the relay destination and source within the correct VLAN and VRF reachability context, followed by verification that clients acquire correct leases through the approved relay path.

Incorrect Answers

A:

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

C:

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

D:

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

Question 262

A switch trunk's CRC error counters climb while application traffic degrades after a fiber transceiver change. Which failure mechanism best explains the observed behavior?

  1. CRC errors indicate physical frame corruption rather than a VLAN-routing configuration error.
  2. An SVI may remain ineffective when its underlying VLAN has no usable access connectivity.
  3. Unrestricted DHCP server responses on an access port can assign clients an incorrect default route.
  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 replace or align the unsupported optic/cable and verify physical-layer compatibility, followed by verification that frame integrity counters remain clean under the expected utilization level.

Incorrect Answers

B:

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

C:

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

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

Question 263

A LAG uses a hash selection that causes one large storage flow to occupy a single member while other links remain mostly idle. Which failure mechanism best explains the observed behavior?

  1. Duplicated unmanaged gateway IP ownership causes ARP instability and conflicting replies.
  2. Conventional Ethernet LAG hashing normally keeps a single flow on one member to preserve ordering.
  3. A static MAC location can override learning even after the host changes location.
  4. An intermediate link has a smaller MTU than the application's required packet size.

Explanation

Correct Answer

B:

The symptoms fit this mechanism. A targeted response is to explain per-flow hashing behavior and distribute independent flows rather than assuming one flow is striped packet-by-packet, followed by verification that aggregate throughput improves with multiple distributed flows without packet reordering.

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

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

D:

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

Question 264

A security requirement calls for isolating two guest groups inside one SSID, but both groups land in an unrestricted shared VLAN. Which failure mechanism best explains the observed behavior?

  1. Layer 2 broadcasts do not cross a routed VLAN boundary by default.
  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. Sharing an SSID or VLAN does not by itself enforce group-level east-west restrictions.

Explanation

Correct Answer

D:

The symptoms fit this mechanism. A targeted response is to implement supported user-role or microsegmentation policy based on the authenticated identity or client class, followed by verification that the two groups access allowed services but cannot reach prohibited peers.

Incorrect Answers

A:

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

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

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

Question 265

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 failure mechanism best explains the observed behavior?

  1. The configured client limit is narrower than the legitimate topology behind that port.
  2. An over-permissive tagged trunk undermines the intended segmentation boundary.
  3. A Layer 2 network with parallel paths and no loop avoidance can replicate frames indefinitely.
  4. The management routing table has no IPv6 path to the collector.

Explanation

Correct Answer

D:

The symptoms fit this mechanism. A targeted response is to install the authorized IPv6 route in the management VRF and verify protocol reachability, followed by verification that SNMPv3 exchanges reach the collector over IPv6 with expected credentials and source.

Incorrect Answers

A:

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

B:

That explanation fits a different case, such as when an AP trunk has every VLAN enabled, allowing guest client traffic onto a restricted internal network. The symptoms here are better explained by the management routing table has no IPv6 path to the collector.

C:

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 management routing table has no IPv6 path to the collector.

Question 266

An access switch shows a large unknown-unicast flood after several upstream MAC addresses aged out too quickly. Which failure mechanism best explains the observed behavior?

  1. Conventional Ethernet LAG hashing normally keeps a single flow on one member to preserve ordering.
  2. The relay packet cannot reach the approved DHCP server from its chosen forwarding table.
  3. Aged-out destinations cause Layer 2 unknown-unicast flooding until relearned.
  4. Sharing an SSID or VLAN does not by itself enforce group-level east-west restrictions.

Explanation

Correct Answer

C:

The symptoms fit this mechanism. A targeted response is to correct the approved MAC aging policy and investigate missing refresh traffic before broad flooding exceptions, followed by verification that known destinations are learned and normal unicast forwarding uses expected egress ports.

Incorrect Answers

A:

That explanation fits a different case, 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. The symptoms here are better explained by aged-out destinations cause Layer 2 unknown-unicast flooding until relearned.

B:

That explanation fits a different case, such as when a client subnet uses an on-box DHCP relay but its requests never reach the centralized server after a VRF split. The symptoms here are better explained by aged-out destinations cause Layer 2 unknown-unicast flooding until relearned.

D:

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

Question 267

A VSX downstream switch has an active multi-chassis LAG, but the primary and secondary peers disagree on the permitted client VLANs. Which failure mechanism best explains the observed behavior?

  1. One interface negotiates differently and is excluded from the logical forwarding group.
  2. Layer 2 broadcasts do not cross a routed VLAN boundary by default.
  3. Unexpected rapid MAC movement generally indicates multiple ingress paths for the same source.
  4. Inconsistent peer-side LAG settings can create asymmetric forwarding after failover.

Explanation

Correct Answer

D:

The symptoms fit this mechanism. A targeted response is to synchronize or align the VSX multi-chassis LAG VLAN configuration on both peers, followed by verification that the same permitted VLAN set reaches the downstream device via either peer.

Incorrect Answers

A:

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

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

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

Question 268

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 failure mechanism best explains the observed behavior?

  1. A Layer 2 network with parallel paths and no loop avoidance can replicate frames indefinitely.
  2. Duplicated unmanaged gateway IP ownership causes ARP instability and conflicting replies.
  3. Access mode sends traffic for one untagged VLAN instead of carrying multiple tagged networks.
  4. Without membership-based snooping, multicast may be flooded like unknown traffic.

Explanation

Correct Answer

B:

The symptoms fit this mechanism. A targeted response is to remove the conflicting address and deploy a supported unique or shared virtual gateway design, followed by verification that hosts resolve one intended gateway identity and maintain stable forwarding.

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

C:

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

D:

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

Question 269

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 failure mechanism best explains the observed behavior?

  1. Co-channel contention in a shared 2.4 GHz channel increases airtime competition even with strong signal.
  2. Unsupported authentication and encryption suites prevent association to WPA3-only WLANs.
  3. Client localization depends on accurate reference positions and RF geometry.
  4. Closely spaced 2.4 GHz channels overlap spectrally and interfere with one another.

Explanation

Correct Answer

A:

The symptoms fit this mechanism. A targeted response is to replan the 2.4 GHz channel assignments using nonoverlapping channels and measured interference, followed by verification that retries and channel utilization fall and stable application performance returns in the affected wing.

Incorrect Answers

B:

That explanation fits a different case, such as when a campus is migrating staff to WPA3-Enterprise but several devices only support WPA2-Enterprise. The symptoms here are better explained by co-channel contention in a shared 2.4 GHz channel increases airtime competition even with strong signal.

C:

That explanation fits a different case, such as when a warehouse deployment needs accurate client location, but APs were installed with no stable coordinate or floor map assignment. The symptoms here are better explained by co-channel contention in a shared 2.4 GHz channel increases airtime competition even with strong signal.

D:

That explanation fits a different case, such as when a site uses overlapping 2.4 GHz channels 1 and 3 believing their numbers are far enough apart. The symptoms here are better explained by co-channel contention in a shared 2.4 GHz channel increases airtime competition even with strong signal.

Question 270

An office installs a new 6 GHz-capable AP, but an older 802.11ac laptop cannot detect the dedicated 6 GHz-only SSID. Which failure mechanism best explains the observed behavior?

  1. Slow basic rates and many management frames consume airtime that higher-rate clients would otherwise use.
  2. A directional antenna focuses radiated energy in the wrong physical direction.
  3. A 5 GHz-only 802.11ac radio cannot discover or join a 6 GHz WLAN.
  4. Duplicate or inherited WLAN profiles can continue advertising a supposedly retired SSID.

Explanation

Correct Answer

C:

The symptoms fit this mechanism. A targeted response is to provide an appropriate supported 5 GHz service for legacy clients instead of assuming 6 GHz backward compatibility, followed by verification that the legacy laptop associates to its supported band while capable devices use 6 GHz.

Incorrect Answers

A:

That explanation fits a different case, such as when an office has a high-density 2.4 GHz WLAN where many IoT sensors use old low basic rates, consuming excessive airtime. The symptoms here are better explained by a 5 GHz-only 802.11ac radio cannot discover or join a 6 GHz WLAN.

B:

That explanation fits a different case, such as when an AP is installed with a directional antenna pointed into a concrete wall rather than the intended warehouse aisle. The symptoms here are better explained by a 5 GHz-only 802.11ac radio cannot discover or join a 6 GHz WLAN.

D:

That explanation fits a different case, such as when a security team wants to disable a previously unused SSID but the site still broadcasts it through a second WLAN profile. The symptoms here are better explained by a 5 GHz-only 802.11ac radio cannot discover or join a 6 GHz WLAN.