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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 26

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.

Question 251

An edge port has port-security configured for one device and a desk phone with a downstream PC is unexpectedly blocked. Which failure mechanism best explains the observed behavior?

  1. MAC-to-IP-to-port ownership is not enforced by ordinary VLAN isolation.
  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. 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 select a supported multi-device policy or validated endpoint topology appropriate for phone-plus-PC access, followed by verification that the phone and permitted PC both connect while additional unauthorized devices are rejected.

Incorrect Answers

A:

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

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

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

Question 252

A multicast video stream floods every port in a VLAN after an IGMP snooping feature is disabled. 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. Aged-out destinations cause Layer 2 unknown-unicast flooding until relearned.
  3. CRC errors indicate physical frame corruption rather than a VLAN-routing configuration error.
  4. Without membership-based snooping, multicast may be flooded like unknown traffic.

Explanation

Correct Answer

D:

The symptoms fit this mechanism. A targeted response is to enable and correctly operate IGMP snooping with a reachable querier for the VLAN, followed by verification that the stream is delivered to subscribed receivers while uninterested ports show no unwanted multicast load.

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

B:

That explanation fits a different case, such as when an access switch shows a large unknown-unicast flood after several upstream MAC addresses aged out too quickly. The symptoms here are better explained by without membership-based snooping, multicast may be flooded like unknown traffic.

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

Question 253

A newly enabled MSTP configuration blocks the wrong uplink because two switches assign VLANs to inconsistent instances. Which failure mechanism best explains the observed behavior?

  1. An over-permissive tagged trunk undermines the intended segmentation boundary.
  2. Mismatched MST region parameters prevent consistent intended spanning-tree instance behavior.
  3. One interface negotiates differently and is excluded from the logical forwarding group.
  4. The legitimate offer arrives on an interface classified as untrusted by the snooping policy.

Explanation

Correct Answer

B:

The symptoms fit this mechanism. A targeted response is to align the MST region name, revision and VLAN-to-instance mapping across the intended region, followed by verification that the correct instance root and forwarding topology appear for each mapped VLAN.

Incorrect Answers

A:

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

C:

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

D:

That explanation fits a different case, such as when a switch is configured with DHCP snooping, but legitimate lease offers arriving from the authorized DHCP uplink are dropped. The symptoms here are better explained by mismatched MST region parameters prevent consistent intended spanning-tree instance behavior.

Question 254

A campus administrator disables STP globally to reduce convergence time, and a redundant link introduces a broadcast storm. 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. Conventional Ethernet LAG hashing normally keeps a single flow on one member to preserve ordering.
  3. Access VLAN membership does not match the subnet selected for that endpoint.
  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 a supported loop-free topology with RSTP or an approved equivalent redundancy design, followed by verification that redundant links operate without broadcast storms and failover matches the design.

Incorrect Answers

B:

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

C:

That explanation fits a different case, such as when a new finance printer is connected to an access port in VLAN 130, but the subnet gateway is an SVI in VLAN 120. The symptoms here are better explained by a Layer 2 network with parallel paths and no loop avoidance can replicate frames indefinitely.

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

Question 255

A service requires large Ethernet payloads, but a path across several CX switches drops only oversized frames. Which failure mechanism best explains the observed behavior?

  1. An intermediate link has a smaller MTU than the application's required packet size.
  2. Sharing an SSID or VLAN does not by itself enforce group-level east-west restrictions.
  3. Duplicated unmanaged gateway IP ownership causes ARP instability and conflicting replies.
  4. The legitimate offer arrives on an interface classified as untrusted by the snooping policy.

Explanation

Correct Answer

A:

The symptoms fit this mechanism. A targeted response is to set a mutually supported MTU end-to-end on participating interfaces, validating hardware limits, followed by verification that end-to-end test packets of the approved size pass without fragmentation or blackholing.

Incorrect Answers

B:

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

C:

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

D:

That explanation fits a different case, such as when a switch is configured with DHCP snooping, but legitimate lease offers arriving from the authorized DHCP uplink are dropped. The symptoms here are better explained by an intermediate link has a smaller MTU than the application's required packet size.

Question 256

A switch port connected to a hypervisor must carry three isolated tenant VLANs, but it is left in access mode. Which failure mechanism best explains the observed behavior?

  1. One interface negotiates differently and is excluded from the logical forwarding group.
  2. Unrestricted DHCP server responses on an access port can assign clients an incorrect default route.
  3. Without membership-based snooping, multicast may be flooded like unknown traffic.
  4. Access mode sends traffic for one untagged VLAN instead of carrying multiple tagged networks.

Explanation

Correct Answer

D:

The symptoms fit this mechanism. A targeted response is to configure an approved tagged trunk with precisely the tenant VLANs required, followed by verification that the hypervisor communicates on all approved tenant VLANs without leaking others.

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

B:

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

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

Question 257

A campus uses static MAC entries for critical systems, but after an authorized server relocation traffic still forwards to the old port. Which failure mechanism best explains the observed behavior?

  1. A static MAC location can override learning even after the host changes location.
  2. The management routing table has no IPv6 path to the collector.
  3. MAC-to-IP-to-port ownership is not enforced by ordinary VLAN isolation.
  4. Mismatched MST region parameters prevent consistent intended spanning-tree instance behavior.

Explanation

Correct Answer

A:

The symptoms fit this mechanism. A targeted response is to update or remove the obsolete static forwarding entry using the approved relocation process, followed by verification that traffic follows the moved server's new port and no stale static entry remains.

Incorrect Answers

B:

That explanation fits a different case, 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. The symptoms here are better explained by a static MAC location can override learning even after the host changes location.

C:

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

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

Question 258

A new Layer 3 switch hosts the user VLAN gateway but the SVI mask excludes part of the expected address range. Which failure mechanism best explains the observed behavior?

  1. An intermediate link has a smaller MTU than the application's required packet size.
  2. The incorrect subnet boundary makes some intended local hosts appear remote or unreachable.
  3. Access VLAN membership does not match the subnet selected for that endpoint.
  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 correct the gateway SVI subnet mask to the approved addressing plan, followed by verification that every host in the defined subnet can reach the correct local gateway and route to approved peers.

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

C:

That explanation fits a different case, such as when a new finance printer is connected to an access port in VLAN 130, but the subnet gateway is an SVI in VLAN 120. The symptoms here are better explained by the incorrect subnet boundary makes some intended local hosts appear remote or unreachable.

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

Question 259

A campus needs to reduce ARP spoofing from open lab ports, yet engineers plan to permit all ARP replies. Which failure mechanism best explains the observed behavior?

  1. Unvalidated ARP claims can redirect traffic by associating gateway IPs with attacker MACs.
  2. The two peers disagree about how untagged Ethernet frames map to a VLAN.
  3. An SVI may remain ineffective when its underlying VLAN has no usable access connectivity.
  4. Unexpected rapid MAC movement generally indicates multiple ingress paths for the same source.

Explanation

Correct Answer

A:

The symptoms fit this mechanism. A targeted response is to use a supported ARP validation or source-binding control appropriate for the platform and VLAN, followed by verification that legitimate ARP exchanges succeed while forged gateway claims are rejected.

Incorrect Answers

B:

That explanation fits a different case, such as when an 802.1Q trunk carries VLAN 20 untagged on one end and tagged on the other, causing intermittent DHCP placement. The symptoms here are better explained by unvalidated ARP claims can redirect traffic by associating gateway IPs with attacker MACs.

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

D:

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

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.