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HP HPE7-A08 Bundle

Exam Code: HPE7-A08

Exam Name HPE Network Switching Professional

Certification Provider: HP

Corresponding Certification: HPE Aruba Networking Certified Professional - Switching

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HP HPE7-A08 Practice Test 43

Question 420

The HPE AOS-CX switching case is: A new desktop is attached to a port whose previous conference phone configuration uses a voice VLAN. Select TWO: a corrective switching action and separate evidence that the correction worked. (Select TWO.)

  1. Compare a failed endpoint's observed MAC-learning VLAN, access interface membership and IP lease with the expected role.
  2. MAC tables and host lease tests confirm the intended VLAN and matching first-hop gateway after correction.
  3. Start IP reachability triage by comparing host address, mask, default gateway and SVI subnet on the actual VLAN before changing routes.
  4. A compliant endpoint authenticates into its expected role and receives an authorized lease with correct gateway and DNS.
  5. Check VSX peer roles, ISL state, separate keepalive and multichassis LAG status when distribution connectivity is asymmetric.

Explanation

Correct Answers

A:

The targeted correction for A new desktop is attached to a port whose previous conference phone configuration uses a voice VLAN is: Compare a failed endpoint's observed MAC-learning VLAN, access interface membership and IP lease with the expected role. It reduces the risk that a host in the wrong access VLAN can contact the wrong DHCP scope or become disconnected from its authorized services.

B:

A separate operational validation for A new desktop is attached to a port whose previous conference phone configuration uses a voice VLAN is: MAC tables and host lease tests confirm the intended VLAN and matching first-hop gateway after correction. It proves intended behavior instead of accepting configuration presence alone.

Incorrect Answers

C:

This alternative concerns duplicate or mismatched host ipv4 settings; its associated risk is: A duplicate or off-subnet gateway can make traffic fail at the first hop even while switch links and route tables appear normal. The observed case A new desktop is attached to a port whose previous conference phone configuration uses a voice VLAN requires the more specific incorrect vlan access assignment identification control. The targeted action is: Compare a failed endpoint's observed MAC-learning VLAN, access interface membership and IP lease with the expected role.

D:

This alternative concerns dhcp and wired-authentication first-hop failures; its associated risk is: A blocked DHCP relay or failed RADIUS policy can masquerade as a dead network even though forwarding interfaces remain operational. The observed case A new desktop is attached to a port whose previous conference phone configuration uses a voice VLAN requires the more specific incorrect vlan access assignment identification control. The targeted action is: Compare a failed endpoint's observed MAC-learning VLAN, access interface membership and IP lease with the expected role.

E:

This alternative concerns vsx keepalive isl and peer-state fault; its associated risk is: An ISL failure without a correctly operating peer control path can disrupt dual-homed systems and complicate split recovery. The observed case A new desktop is attached to a port whose previous conference phone configuration uses a voice VLAN requires the more specific incorrect vlan access assignment identification control. The targeted action is: Compare a failed endpoint's observed MAC-learning VLAN, access interface membership and IP lease with the expected role.

Question 421

An HPE Aruba Networking engineer observes: An engineer finds a MAC address in VLAN 199 when design documents require it in VLAN 120. The corrective solution must keep intended connectivity, segmentation, and operational resilience. Which implementation or troubleshooting step directly resolves the specific network issue?

  1. Compare a failed endpoint's observed MAC-learning VLAN, access interface membership and IP lease with the expected role.
  2. Start IP reachability triage by comparing host address, mask, default gateway and SVI subnet on the actual VLAN before changing routes.
  3. Use port operational status, optical diagnostics and CRC or FCS counters to distinguish physical failure from VLAN and routing issues.
  4. Check VSX peer roles, ISL state, separate keepalive and multichassis LAG status when distribution connectivity is asymmetric.

Explanation

Correct Answer

A:

The decisive observed condition is: An engineer finds a MAC address in VLAN 199 when design documents require it in VLAN 120. The appropriate switching action is: Compare a failed endpoint's observed MAC-learning VLAN, access interface membership and IP lease with the expected role. It addresses the risk that a host in the wrong access VLAN can contact the wrong DHCP scope or become disconnected from its authorized services. Confirm with: MAC tables and host lease tests confirm the intended VLAN and matching first-hop gateway after correction.

Incorrect Answers

B:

This alternative concerns duplicate or mismatched host ipv4 settings; its associated risk is: A duplicate or off-subnet gateway can make traffic fail at the first hop even while switch links and route tables appear normal. The observed case An engineer finds a MAC address in VLAN 199 when design documents require it in VLAN 120 requires the more specific incorrect vlan access assignment identification control. The targeted action is: Compare a failed endpoint's observed MAC-learning VLAN, access interface membership and IP lease with the expected role.

C:

This alternative concerns ethernet carrier optic and physical fault isolation; its associated risk is: Repeated CRC errors or light loss can mimic application failures even when the port intermittently reports up. The observed case An engineer finds a MAC address in VLAN 199 when design documents require it in VLAN 120 requires the more specific incorrect vlan access assignment identification control. The targeted action is: Compare a failed endpoint's observed MAC-learning VLAN, access interface membership and IP lease with the expected role.

D:

This alternative concerns vsx keepalive isl and peer-state fault; its associated risk is: An ISL failure without a correctly operating peer control path can disrupt dual-homed systems and complicate split recovery. The observed case An engineer finds a MAC address in VLAN 199 when design documents require it in VLAN 120 requires the more specific incorrect vlan access assignment identification control. The targeted action is: Compare a failed endpoint's observed MAC-learning VLAN, access interface membership and IP lease with the expected role.

Question 422

An engineer investigates: An engineer finds a MAC address in VLAN 199 when design documents require it in VLAN 120. What acceptance evidence most directly demonstrates the correction succeeded?

  1. A corrected test host ARPs for the intended gateway and reaches both a local peer and an approved remote subnet.
  2. A repaired link maintains expected negotiation and clean counters across a sustained bidirectional traffic test.
  3. MAC tables and host lease tests confirm the intended VLAN and matching first-hop gateway after correction.
  4. VSX state, ISL and keepalive show expected health and host traffic remains available after one controlled peer fault.

Explanation

Correct Answer

C:

The independent acceptance evidence for An engineer finds a MAC address in VLAN 199 when design documents require it in VLAN 120 is: MAC tables and host lease tests confirm the intended VLAN and matching first-hop gateway after correction. It tests whether the team has actually implemented: Compare a failed endpoint's observed MAC-learning VLAN, access interface membership and IP lease with the expected role. An enabled interface or saved configuration by itself is not evidence of complete service recovery.

Incorrect Answers

A:

This alternative concerns duplicate or mismatched host ipv4 settings; its associated risk is: A duplicate or off-subnet gateway can make traffic fail at the first hop even while switch links and route tables appear normal. The observed case An engineer finds a MAC address in VLAN 199 when design documents require it in VLAN 120 requires the more specific incorrect vlan access assignment identification control. The targeted action is: Compare a failed endpoint's observed MAC-learning VLAN, access interface membership and IP lease with the expected role.

B:

This alternative concerns ethernet carrier optic and physical fault isolation; its associated risk is: Repeated CRC errors or light loss can mimic application failures even when the port intermittently reports up. The observed case An engineer finds a MAC address in VLAN 199 when design documents require it in VLAN 120 requires the more specific incorrect vlan access assignment identification control. The targeted action is: Compare a failed endpoint's observed MAC-learning VLAN, access interface membership and IP lease with the expected role.

D:

This alternative concerns vsx keepalive isl and peer-state fault; its associated risk is: An ISL failure without a correctly operating peer control path can disrupt dual-homed systems and complicate split recovery. The observed case An engineer finds a MAC address in VLAN 199 when design documents require it in VLAN 120 requires the more specific incorrect vlan access assignment identification control. The targeted action is: Compare a failed endpoint's observed MAC-learning VLAN, access interface membership and IP lease with the expected role.

Question 423

An HPE Aruba Networking engineer observes: A troubleshooting team resets endpoint drivers instead of noticing the port was copied from an unrelated user-role template. The corrective solution must keep intended connectivity, segmentation, and operational resilience. Which response best satisfies the technical requirement without disrupting unrelated traffic?

  1. Start IP reachability triage by comparing host address, mask, default gateway and SVI subnet on the actual VLAN before changing routes.
  2. Compare LACP partner IDs, actor states, member eligibility and upstream wiring to locate a failed or partially formed bundle.
  3. Compare a failed endpoint's observed MAC-learning VLAN, access interface membership and IP lease with the expected role.
  4. Review VSF member status, conductor role, topology and stack link health before treating missing interfaces as VLAN misconfiguration.

Explanation

Correct Answer

C:

The decisive observed condition is: A troubleshooting team resets endpoint drivers instead of noticing the port was copied from an unrelated user-role template. The appropriate switching action is: Compare a failed endpoint's observed MAC-learning VLAN, access interface membership and IP lease with the expected role. It addresses the risk that a host in the wrong access VLAN can contact the wrong DHCP scope or become disconnected from its authorized services. Confirm with: MAC tables and host lease tests confirm the intended VLAN and matching first-hop gateway after correction.

Incorrect Answers

A:

This alternative concerns duplicate or mismatched host ipv4 settings; its associated risk is: A duplicate or off-subnet gateway can make traffic fail at the first hop even while switch links and route tables appear normal. The observed case A troubleshooting team resets endpoint drivers instead of noticing the port was copied from an unrelated user-role template requires the more specific incorrect vlan access assignment identification control. The targeted action is: Compare a failed endpoint's observed MAC-learning VLAN, access interface membership and IP lease with the expected role.

B:

This alternative concerns lacp aggregator and individual member failure; its associated risk is: A LAG with the wrong partner or member state can behave like a link failure despite all cables showing carrier. The observed case A troubleshooting team resets endpoint drivers instead of noticing the port was copied from an unrelated user-role template requires the more specific incorrect vlan access assignment identification control. The targeted action is: Compare a failed endpoint's observed MAC-learning VLAN, access interface membership and IP lease with the expected role.

D:

This alternative concerns vsf member identity and split detection fault; its associated risk is: A failed stack member or split may remove physical access ports and strand endpoints while the logical switch remains partially reachable. The observed case A troubleshooting team resets endpoint drivers instead of noticing the port was copied from an unrelated user-role template requires the more specific incorrect vlan access assignment identification control. The targeted action is: Compare a failed endpoint's observed MAC-learning VLAN, access interface membership and IP lease with the expected role.

Question 424

The switch operations team reports: A troubleshooting team resets endpoint drivers instead of noticing the port was copied from an unrelated user-role template. Which failure or service risk most directly follows from leaving this condition uncorrected?

  1. A duplicate or off-subnet gateway can make traffic fail at the first hop even while switch links and route tables appear normal.
  2. A LAG with the wrong partner or member state can behave like a link failure despite all cables showing carrier.
  3. A failed stack member or split may remove physical access ports and strand endpoints while the logical switch remains partially reachable.
  4. A host in the wrong access VLAN can contact the wrong DHCP scope or become disconnected from its authorized services.

Explanation

Correct Answer

D:

The direct operational failure mode is: A host in the wrong access VLAN can contact the wrong DHCP scope or become disconnected from its authorized services. It applies to the condition A troubleshooting team resets endpoint drivers instead of noticing the port was copied from an unrelated user-role template. The suitable corrective action is: Compare a failed endpoint's observed MAC-learning VLAN, access interface membership and IP lease with the expected role. Independently validate using: MAC tables and host lease tests confirm the intended VLAN and matching first-hop gateway after correction.

Incorrect Answers

A:

This alternative concerns duplicate or mismatched host ipv4 settings; its associated risk is: A duplicate or off-subnet gateway can make traffic fail at the first hop even while switch links and route tables appear normal. The observed case A troubleshooting team resets endpoint drivers instead of noticing the port was copied from an unrelated user-role template requires the more specific incorrect vlan access assignment identification control. The targeted action is: Compare a failed endpoint's observed MAC-learning VLAN, access interface membership and IP lease with the expected role.

B:

This alternative concerns lacp aggregator and individual member failure; its associated risk is: A LAG with the wrong partner or member state can behave like a link failure despite all cables showing carrier. The observed case A troubleshooting team resets endpoint drivers instead of noticing the port was copied from an unrelated user-role template requires the more specific incorrect vlan access assignment identification control. The targeted action is: Compare a failed endpoint's observed MAC-learning VLAN, access interface membership and IP lease with the expected role.

C:

This alternative concerns vsf member identity and split detection fault; its associated risk is: A failed stack member or split may remove physical access ports and strand endpoints while the logical switch remains partially reachable. The observed case A troubleshooting team resets endpoint drivers instead of noticing the port was copied from an unrelated user-role template requires the more specific incorrect vlan access assignment identification control. The targeted action is: Compare a failed endpoint's observed MAC-learning VLAN, access interface membership and IP lease with the expected role.

Question 425

An HPE Aruba Networking engineer observes: VLAN 210 users work on a local switch but cannot reach the gateway because the upstream trunk omits 210. The corrective solution must keep intended connectivity, segmentation, and operational resilience. Which change best addresses the observed switching requirement?

  1. Check VSX peer roles, ISL state, separate keepalive and multichassis LAG status when distribution connectivity is asymmetric.
  2. Inspect MSTP region configuration, root election and per-instance port states to explain blocking or topology churn.
  3. Trace the affected VLAN over all inter-switch trunks and reconcile tagged or untagged handling at each hop.
  4. Review VSF member status, conductor role, topology and stack link health before treating missing interfaces as VLAN misconfiguration.

Explanation

Correct Answer

C:

The decisive observed condition is: VLAN 210 users work on a local switch but cannot reach the gateway because the upstream trunk omits 210. The appropriate switching action is: Trace the affected VLAN over all inter-switch trunks and reconcile tagged or untagged handling at each hop. It addresses the risk that one mismatched trunk can isolate an entire VLAN while other VLANs continue operating normally, obscuring the break. Confirm with: A probe from each side of the affected trunk passes on the required VLAN without unapproved tag leakage.

Incorrect Answers

A:

This alternative concerns vsx keepalive isl and peer-state fault; its associated risk is: An ISL failure without a correctly operating peer control path can disrupt dual-homed systems and complicate split recovery. The observed case VLAN 210 users work on a local switch but cannot reach the gateway because the upstream trunk omits 210 requires the more specific trunk allowed vlan and native tag fault detection control. The targeted action is: Trace the affected VLAN over all inter-switch trunks and reconcile tagged or untagged handling at each hop.

B:

This alternative concerns spanning tree topology and root inconsistency; its associated risk is: An unexpected root or mismatched region can suppress the intended redundant forwarding path and cause intermittent client connectivity. The observed case VLAN 210 users work on a local switch but cannot reach the gateway because the upstream trunk omits 210 requires the more specific trunk allowed vlan and native tag fault detection control. The targeted action is: Trace the affected VLAN over all inter-switch trunks and reconcile tagged or untagged handling at each hop.

D:

This alternative concerns vsf member identity and split detection fault; its associated risk is: A failed stack member or split may remove physical access ports and strand endpoints while the logical switch remains partially reachable. The observed case VLAN 210 users work on a local switch but cannot reach the gateway because the upstream trunk omits 210 requires the more specific trunk allowed vlan and native tag fault detection control. The targeted action is: Trace the affected VLAN over all inter-switch trunks and reconcile tagged or untagged handling at each hop.

Question 426

An engineer investigates: VLAN 210 users work on a local switch but cannot reach the gateway because the upstream trunk omits 210. Which test would independently confirm expected switch behavior?

  1. VSX state, ISL and keepalive show expected health and host traffic remains available after one controlled peer fault.
  2. The stack returns to a single intended logical inventory with healthy member ports and validated failover.
  3. A probe from each side of the affected trunk passes on the required VLAN without unapproved tag leakage.
  4. MSTP state returns to the designed root and port roles after a controlled link-state test.

Explanation

Correct Answer

C:

The independent acceptance evidence for VLAN 210 users work on a local switch but cannot reach the gateway because the upstream trunk omits 210 is: A probe from each side of the affected trunk passes on the required VLAN without unapproved tag leakage. It tests whether the team has actually implemented: Trace the affected VLAN over all inter-switch trunks and reconcile tagged or untagged handling at each hop. An enabled interface or saved configuration by itself is not evidence of complete service recovery.

Incorrect Answers

A:

This alternative concerns vsx keepalive isl and peer-state fault; its associated risk is: An ISL failure without a correctly operating peer control path can disrupt dual-homed systems and complicate split recovery. The observed case VLAN 210 users work on a local switch but cannot reach the gateway because the upstream trunk omits 210 requires the more specific trunk allowed vlan and native tag fault detection control. The targeted action is: Trace the affected VLAN over all inter-switch trunks and reconcile tagged or untagged handling at each hop.

B:

This alternative concerns vsf member identity and split detection fault; its associated risk is: A failed stack member or split may remove physical access ports and strand endpoints while the logical switch remains partially reachable. The observed case VLAN 210 users work on a local switch but cannot reach the gateway because the upstream trunk omits 210 requires the more specific trunk allowed vlan and native tag fault detection control. The targeted action is: Trace the affected VLAN over all inter-switch trunks and reconcile tagged or untagged handling at each hop.

D:

This alternative concerns spanning tree topology and root inconsistency; its associated risk is: An unexpected root or mismatched region can suppress the intended redundant forwarding path and cause intermittent client connectivity. The observed case VLAN 210 users work on a local switch but cannot reach the gateway because the upstream trunk omits 210 requires the more specific trunk allowed vlan and native tag fault detection control. The targeted action is: Trace the affected VLAN over all inter-switch trunks and reconcile tagged or untagged handling at each hop.

Question 427

An HPE Aruba Networking engineer observes: Two switches connected by a trunk treat untagged frames as different VLANs and management access disappears. The corrective solution must keep intended connectivity, segmentation, and operational resilience. What is the most defensible operational action before closing the network change?

  1. Check VSX peer roles, ISL state, separate keepalive and multichassis LAG status when distribution connectivity is asymmetric.
  2. Trace the affected VLAN over all inter-switch trunks and reconcile tagged or untagged handling at each hop.
  3. Compare LACP partner IDs, actor states, member eligibility and upstream wiring to locate a failed or partially formed bundle.
  4. Check authorized DHCP offer path and access-port authentication state when clients cannot obtain usable connectivity.

Explanation

Correct Answer

B:

The decisive observed condition is: Two switches connected by a trunk treat untagged frames as different VLANs and management access disappears. The appropriate switching action is: Trace the affected VLAN over all inter-switch trunks and reconcile tagged or untagged handling at each hop. It addresses the risk that one mismatched trunk can isolate an entire VLAN while other VLANs continue operating normally, obscuring the break. Confirm with: A probe from each side of the affected trunk passes on the required VLAN without unapproved tag leakage.

Incorrect Answers

A:

This alternative concerns vsx keepalive isl and peer-state fault; its associated risk is: An ISL failure without a correctly operating peer control path can disrupt dual-homed systems and complicate split recovery. The observed case Two switches connected by a trunk treat untagged frames as different VLANs and management access disappears requires the more specific trunk allowed vlan and native tag fault detection control. The targeted action is: Trace the affected VLAN over all inter-switch trunks and reconcile tagged or untagged handling at each hop.

C:

This alternative concerns lacp aggregator and individual member failure; its associated risk is: A LAG with the wrong partner or member state can behave like a link failure despite all cables showing carrier. The observed case Two switches connected by a trunk treat untagged frames as different VLANs and management access disappears requires the more specific trunk allowed vlan and native tag fault detection control. The targeted action is: Trace the affected VLAN over all inter-switch trunks and reconcile tagged or untagged handling at each hop.

D:

This alternative concerns dhcp and wired-authentication first-hop failures; its associated risk is: A blocked DHCP relay or failed RADIUS policy can masquerade as a dead network even though forwarding interfaces remain operational. The observed case Two switches connected by a trunk treat untagged frames as different VLANs and management access disappears requires the more specific trunk allowed vlan and native tag fault detection control. The targeted action is: Trace the affected VLAN over all inter-switch trunks and reconcile tagged or untagged handling at each hop.

Question 428

The switch operations team reports: Two switches connected by a trunk treat untagged frames as different VLANs and management access disappears. What is the most relevant operational exposure in this switching scenario?

  1. A LAG with the wrong partner or member state can behave like a link failure despite all cables showing carrier.
  2. One mismatched trunk can isolate an entire VLAN while other VLANs continue operating normally, obscuring the break.
  3. A blocked DHCP relay or failed RADIUS policy can masquerade as a dead network even though forwarding interfaces remain operational.
  4. An ISL failure without a correctly operating peer control path can disrupt dual-homed systems and complicate split recovery.

Explanation

Correct Answer

B:

The direct operational failure mode is: One mismatched trunk can isolate an entire VLAN while other VLANs continue operating normally, obscuring the break. It applies to the condition Two switches connected by a trunk treat untagged frames as different VLANs and management access disappears. The suitable corrective action is: Trace the affected VLAN over all inter-switch trunks and reconcile tagged or untagged handling at each hop. Independently validate using: A probe from each side of the affected trunk passes on the required VLAN without unapproved tag leakage.

Incorrect Answers

A:

This alternative concerns lacp aggregator and individual member failure; its associated risk is: A LAG with the wrong partner or member state can behave like a link failure despite all cables showing carrier. The observed case Two switches connected by a trunk treat untagged frames as different VLANs and management access disappears requires the more specific trunk allowed vlan and native tag fault detection control. The targeted action is: Trace the affected VLAN over all inter-switch trunks and reconcile tagged or untagged handling at each hop.

C:

This alternative concerns dhcp and wired-authentication first-hop failures; its associated risk is: A blocked DHCP relay or failed RADIUS policy can masquerade as a dead network even though forwarding interfaces remain operational. The observed case Two switches connected by a trunk treat untagged frames as different VLANs and management access disappears requires the more specific trunk allowed vlan and native tag fault detection control. The targeted action is: Trace the affected VLAN over all inter-switch trunks and reconcile tagged or untagged handling at each hop.

D:

This alternative concerns vsx keepalive isl and peer-state fault; its associated risk is: An ISL failure without a correctly operating peer control path can disrupt dual-homed systems and complicate split recovery. The observed case Two switches connected by a trunk treat untagged frames as different VLANs and management access disappears requires the more specific trunk allowed vlan and native tag fault detection control. The targeted action is: Trace the affected VLAN over all inter-switch trunks and reconcile tagged or untagged handling at each hop.

Question 429

An HPE Aruba Networking engineer observes: A new building's CCTV VLAN never passes the interbuilding link despite healthy physical carrier. The corrective solution must keep intended connectivity, segmentation, and operational resilience. Which implementation or troubleshooting step directly resolves the specific network issue?

  1. Trace the affected VLAN over all inter-switch trunks and reconcile tagged or untagged handling at each hop.
  2. Inspect MSTP region configuration, root election and per-instance port states to explain blocking or topology churn.
  3. Use port operational status, optical diagnostics and CRC or FCS counters to distinguish physical failure from VLAN and routing issues.
  4. Check authorized DHCP offer path and access-port authentication state when clients cannot obtain usable connectivity.

Explanation

Correct Answer

A:

The decisive observed condition is: A new building's CCTV VLAN never passes the interbuilding link despite healthy physical carrier. The appropriate switching action is: Trace the affected VLAN over all inter-switch trunks and reconcile tagged or untagged handling at each hop. It addresses the risk that one mismatched trunk can isolate an entire VLAN while other VLANs continue operating normally, obscuring the break. Confirm with: A probe from each side of the affected trunk passes on the required VLAN without unapproved tag leakage.

Incorrect Answers

B:

This alternative concerns spanning tree topology and root inconsistency; its associated risk is: An unexpected root or mismatched region can suppress the intended redundant forwarding path and cause intermittent client connectivity. The observed case A new building's CCTV VLAN never passes the interbuilding link despite healthy physical carrier requires the more specific trunk allowed vlan and native tag fault detection control. The targeted action is: Trace the affected VLAN over all inter-switch trunks and reconcile tagged or untagged handling at each hop.

C:

This alternative concerns ethernet carrier optic and physical fault isolation; its associated risk is: Repeated CRC errors or light loss can mimic application failures even when the port intermittently reports up. The observed case A new building's CCTV VLAN never passes the interbuilding link despite healthy physical carrier requires the more specific trunk allowed vlan and native tag fault detection control. The targeted action is: Trace the affected VLAN over all inter-switch trunks and reconcile tagged or untagged handling at each hop.

D:

This alternative concerns dhcp and wired-authentication first-hop failures; its associated risk is: A blocked DHCP relay or failed RADIUS policy can masquerade as a dead network even though forwarding interfaces remain operational. The observed case A new building's CCTV VLAN never passes the interbuilding link despite healthy physical carrier requires the more specific trunk allowed vlan and native tag fault detection control. The targeted action is: Trace the affected VLAN over all inter-switch trunks and reconcile tagged or untagged handling at each hop.

Question 430

The HPE AOS-CX switching case is: A new building's CCTV VLAN never passes the interbuilding link despite healthy physical carrier. Which TWO choices together provide the targeted remedy and independent validation? (Select TWO.)

  1. Trace the affected VLAN over all inter-switch trunks and reconcile tagged or untagged handling at each hop.
  2. A probe from each side of the affected trunk passes on the required VLAN without unapproved tag leakage.
  3. Use port operational status, optical diagnostics and CRC or FCS counters to distinguish physical failure from VLAN and routing issues.
  4. Inspect MSTP region configuration, root election and per-instance port states to explain blocking or topology churn.
  5. A compliant endpoint authenticates into its expected role and receives an authorized lease with correct gateway and DNS.

Explanation

Correct Answers

A:

The targeted correction for A new building's CCTV VLAN never passes the interbuilding link despite healthy physical carrier is: Trace the affected VLAN over all inter-switch trunks and reconcile tagged or untagged handling at each hop. It reduces the risk that one mismatched trunk can isolate an entire VLAN while other VLANs continue operating normally, obscuring the break.

B:

A separate operational validation for A new building's CCTV VLAN never passes the interbuilding link despite healthy physical carrier is: A probe from each side of the affected trunk passes on the required VLAN without unapproved tag leakage. It proves intended behavior instead of accepting configuration presence alone.

Incorrect Answers

C:

This alternative concerns ethernet carrier optic and physical fault isolation; its associated risk is: Repeated CRC errors or light loss can mimic application failures even when the port intermittently reports up. The observed case A new building's CCTV VLAN never passes the interbuilding link despite healthy physical carrier requires the more specific trunk allowed vlan and native tag fault detection control. The targeted action is: Trace the affected VLAN over all inter-switch trunks and reconcile tagged or untagged handling at each hop.

D:

This alternative concerns spanning tree topology and root inconsistency; its associated risk is: An unexpected root or mismatched region can suppress the intended redundant forwarding path and cause intermittent client connectivity. The observed case A new building's CCTV VLAN never passes the interbuilding link despite healthy physical carrier requires the more specific trunk allowed vlan and native tag fault detection control. The targeted action is: Trace the affected VLAN over all inter-switch trunks and reconcile tagged or untagged handling at each hop.

E:

This alternative concerns dhcp and wired-authentication first-hop failures; its associated risk is: A blocked DHCP relay or failed RADIUS policy can masquerade as a dead network even though forwarding interfaces remain operational. The observed case A new building's CCTV VLAN never passes the interbuilding link despite healthy physical carrier requires the more specific trunk allowed vlan and native tag fault detection control. The targeted action is: Trace the affected VLAN over all inter-switch trunks and reconcile tagged or untagged handling at each hop.