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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 93

Question 920

A campus advertises overlapping VLAN subnet ranges across two sites, generating unpredictable routing to both. Which first diagnostic check is most useful before changing the network?

  1. Compare prefix inventories and longest-prefix route decisions across sites.
  2. Compare router IDs across OSPF peers and neighbor event logs.
  3. Inspect learned LSAs versus installed route selection and applied route policies.
  4. Trace IPv6 routes in both directions and inspect remote return-path entries.

Explanation

Correct Answer

A:

This check collects evidence at the layer implicated by the symptom: duplicate destination prefixes prevent unambiguous routed reachability between sites. Examine the evidence before choosing the corrective change.

Incorrect Answers

B:

This would be a reasonable check when an OSPF domain has duplicate router IDs after a lab switch image is cloned into production, but is less direct for the issue at hand: duplicate destination prefixes prevent unambiguous routed reachability between sites.

C:

This would be a reasonable check when an OSPF router has a healthy adjacency but a destination prefix is missing after someone configured a restrictive inbound route filter, but is less direct for the issue at hand: duplicate destination prefixes prevent unambiguous routed reachability between sites.

D:

This would be a reasonable check when a device sends packets to a remote IPv6 network, but return traffic fails because the remote router lacks the source-prefix route, but is less direct for the issue at hand: duplicate destination prefixes prevent unambiguous routed reachability between sites.

Question 921

A campus uplink is configured as an unnumbered Layer 3 interface but operators try to troubleshoot it as a tagged L2 trunk. Which first diagnostic check is most useful before changing the network?

  1. Inspect ABR area interfaces and inter-area LSAs.
  2. Inspect BGP neighbor logs, configured ASNs and TCP session reachability.
  3. Inspect operational L3 interface address, VRF and routing peer state.
  4. Compare matching route entries and their prefix lengths.

Explanation

Correct Answer

C:

This check collects evidence at the layer implicated by the symptom: a routed interface does not automatically behave as a VLAN-bearing access/trunk port. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when an OSPF multi-area design attaches a remote area directly to another remote area without an approved backbone connection or virtual-link design, but is less direct for the issue at hand: a routed interface does not automatically behave as a VLAN-bearing access/trunk port.

B:

This would be a reasonable check when a campus BGP peering to an ISP remains Idle because the local neighbor remote-AS setting is incorrect, but is less direct for the issue at hand: a routed interface does not automatically behave as a VLAN-bearing access/trunk port.

D:

This would be a reasonable check when a distribution switch learns a specific /24 route and a broader /16 summary; engineers expect the summary to override the specific route, but is less direct for the issue at hand: a routed interface does not automatically behave as a VLAN-bearing access/trunk port.

Question 922

An ACL allows a remote application subnet, yet a client cannot access it because the SVI has no route to that destination. Which first diagnostic check is most useful before changing the network?

  1. Inspect source and destination VRF routes and enforced prefix filters.
  2. Inspect the routing lookup followed by ACL counters for the client flow.
  3. Inspect installed default routes and the health condition controlling their preference.
  4. Inspect BGP neighbor logs, configured ASNs and TCP session reachability.

Explanation

Correct Answer

B:

This check collects evidence at the layer implicated by the symptom: traffic cannot reach an authorized destination without an IP forwarding path. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when a policy requires restricted services in a management VRF to reach a shared NTP system but forbids broad connectivity to the production user VRF, but is less direct for the issue at hand: traffic cannot reach an authorized destination without an IP forwarding path.

C:

This would be a reasonable check when a campus core has a default route toward a failed WAN link, while the healthy standby WAN is not preferred, but is less direct for the issue at hand: traffic cannot reach an authorized destination without an IP forwarding path.

D:

This would be a reasonable check when a campus BGP peering to an ISP remains Idle because the local neighbor remote-AS setting is incorrect, but is less direct for the issue at hand: traffic cannot reach an authorized destination without an IP forwarding path.

Question 923

An OSPF neighbor becomes stuck at 2-Way on a multiaccess broadcast network and the engineer expects every pair of routers to reach Full. Which first diagnostic check is most useful before changing the network?

  1. Inspect BGP neighbor logs, configured ASNs and TCP session reachability.
  2. Inspect the longest-prefix route match and next-hop ARP/neighbor state.
  3. Inspect interface network type, DR/BDR identity and neighbor states.
  4. Inspect OSPF interface configuration and hello reception.

Explanation

Correct Answer

C:

This check collects evidence at the layer implicated by the symptom: on broadcast segments, DROther peers may remain 2-Way while Full adjacency forms with the DR/BDR. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when a campus BGP peering to an ISP remains Idle because the local neighbor remote-AS setting is incorrect, but is less direct for the issue at hand: on broadcast segments, DROther peers may remain 2-Way while Full adjacency forms with the DR/BDR.

B:

This would be a reasonable check when a distribution switch cannot reach an application subnet because its static route references an incorrect next-hop IP, but is less direct for the issue at hand: on broadcast segments, DROther peers may remain 2-Way while Full adjacency forms with the DR/BDR.

D:

This would be a reasonable check when two Aruba CX routers run OSPF on a point-to-point uplink but show no neighbor because one interface is passive, but is less direct for the issue at hand: on broadcast segments, DROther peers may remain 2-Way while Full adjacency forms with the DR/BDR.

Question 924

A team adds a new L3 transit VLAN but configures the wrong IP mask on one side of the point-to-point link. Which first diagnostic check is most useful before changing the network?

  1. Compare prefix inventories and longest-prefix route decisions across sites.
  2. Compare interface IP addresses, masks and neighbor ARP state.
  3. Inspect the routing lookup followed by ACL counters for the client flow.
  4. Inspect originated external LSAs and the associated route-map match conditions.

Explanation

Correct Answer

B:

This check collects evidence at the layer implicated by the symptom: peer interfaces with incompatible on-link subnets cannot reliably establish local next-hop reachability. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when a campus advertises overlapping VLAN subnet ranges across two sites, generating unpredictable routing to both, but is less direct for the issue at hand: peer interfaces with incompatible on-link subnets cannot reliably establish local next-hop reachability.

C:

This would be a reasonable check when an ACL allows a remote application subnet, yet a client cannot access it because the SVI has no route to that destination, but is less direct for the issue at hand: peer interfaces with incompatible on-link subnets cannot reliably establish local next-hop reachability.

D:

This would be a reasonable check when a campus OSPF redistribution policy accidentally injects a default route from a disconnected guest gateway into the internal core, but is less direct for the issue at hand: peer interfaces with incompatible on-link subnets cannot reliably establish local next-hop reachability.

Question 925

A campus uses policy-based routing to force a selected application through a service appliance, but a catch-all policy inadvertently redirects user DNS traffic too. Which first diagnostic check is most useful before changing the network?

  1. Inspect the routing lookup followed by ACL counters for the client flow.
  2. Inspect PBR match counters for application and DNS flows separately.
  3. Compare interface IP addresses, masks and neighbor ARP state.
  4. Inspect neighbor rejection logs and observed hello/dead intervals.

Explanation

Correct Answer

B:

This check collects evidence at the layer implicated by the symptom: an overly broad PBR match overrides normal routing for unrelated DNS sessions. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when an ACL allows a remote application subnet, yet a client cannot access it because the SVI has no route to that destination, but is less direct for the issue at hand: an overly broad PBR match overrides normal routing for unrelated DNS sessions.

C:

This would be a reasonable check when a team adds a new L3 transit VLAN but configures the wrong IP mask on one side of the point-to-point link, but is less direct for the issue at hand: an overly broad PBR match overrides normal routing for unrelated DNS sessions.

D:

This would be a reasonable check when a data center's OSPF router and campus peer have matching area IDs but fail adjacency because their hello/dead timers differ, but is less direct for the issue at hand: an overly broad PBR match overrides normal routing for unrelated DNS sessions.

Question 926

A default route learned from dynamic routing persists despite a better directly connected route for an internal subnet. Which first diagnostic check is most useful before changing the network?

  1. Compare router IDs across OSPF peers and neighbor event logs.
  2. Inspect PBR match counters for application and DNS flows separately.
  3. Inspect BGP neighbor logs, configured ASNs and TCP session reachability.
  4. Inspect selected routes for the internal prefix and a truly unknown destination.

Explanation

Correct Answer

D:

This check collects evidence at the layer implicated by the symptom: a 0/0 default route serves only destinations without a more-specific matching route. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when an OSPF domain has duplicate router IDs after a lab switch image is cloned into production, but is less direct for the issue at hand: a 0/0 default route serves only destinations without a more-specific matching route.

B:

This would be a reasonable check when a campus uses policy-based routing to force a selected application through a service appliance, but a catch-all policy inadvertently redirects user DNS traffic too, but is less direct for the issue at hand: a 0/0 default route serves only destinations without a more-specific matching route.

C:

This would be a reasonable check when a campus BGP peering to an ISP remains Idle because the local neighbor remote-AS setting is incorrect, but is less direct for the issue at hand: a 0/0 default route serves only destinations without a more-specific matching route.

Question 927

A WAN cutover leaves a static route pointing to an old gateway while the current routing protocol advertises a new next hop. Which first diagnostic check is most useful before changing the network?

  1. Inspect effective route metrics and installed next-hop set.
  2. Inspect active route source, preference and next-hop reachability.
  3. Inspect PBR match counters for application and DNS flows separately.
  4. Inspect the routing lookup followed by ACL counters for the client flow.

Explanation

Correct Answer

B:

This check collects evidence at the layer implicated by the symptom: static-route preference can override the new dynamic route even when the old path is broken. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when a branch has two equally routed core uplinks, but one should be reserved as a backup for high-priority traffic, but is less direct for the issue at hand: static-route preference can override the new dynamic route even when the old path is broken.

C:

This would be a reasonable check when a campus uses policy-based routing to force a selected application through a service appliance, but a catch-all policy inadvertently redirects user DNS traffic too, but is less direct for the issue at hand: static-route preference can override the new dynamic route even when the old path is broken.

D:

This would be a reasonable check when an ACL allows a remote application subnet, yet a client cannot access it because the SVI has no route to that destination, but is less direct for the issue at hand: static-route preference can override the new dynamic route even when the old path is broken.

Question 928

A data center's OSPF router and campus peer have matching area IDs but fail adjacency because their hello/dead timers differ. Which first diagnostic check is most useful before changing the network?

  1. Expand each summary to its covered prefix list and compare actual allocations.
  2. Inspect originated external LSAs and the associated route-map match conditions.
  3. Inspect active route source, preference and next-hop reachability.
  4. Inspect neighbor rejection logs and observed hello/dead intervals.

Explanation

Correct Answer

D:

This check collects evidence at the layer implicated by the symptom: OSPF neighboring interfaces require compatible timer parameters to maintain adjacency. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when a network team wants to aggregate many campus subnets but summarizes beyond a boundary that includes networks it does not own, but is less direct for the issue at hand: OSPF neighboring interfaces require compatible timer parameters to maintain adjacency.

B:

This would be a reasonable check when a campus OSPF redistribution policy accidentally injects a default route from a disconnected guest gateway into the internal core, but is less direct for the issue at hand: OSPF neighboring interfaces require compatible timer parameters to maintain adjacency.

C:

This would be a reasonable check when a WAN cutover leaves a static route pointing to an old gateway while the current routing protocol advertises a new next hop, but is less direct for the issue at hand: OSPF neighboring interfaces require compatible timer parameters to maintain adjacency.

Question 929

A company wants enterprise WLAN admission but plans to deploy a shared WPA2 personal passphrase to every employee. Which first diagnostic check is most useful before changing the network?

  1. Inspect the AAA transport type, route and encryption policy.
  2. Inspect the SSID AKM mode and actual authentication backend.
  3. Inspect SNMP service versions, users and monitoring session security parameters.
  4. Inspect active listening services and management ACLs.

Explanation

Correct Answer

B:

This check collects evidence at the layer implicated by the symptom: a common PSK does not provide per-identity access decisions or practical individual revocation. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when a campus uses an unencrypted RADIUS configuration across a transport network where message content protection is mandated, but is less direct for the issue at hand: a common PSK does not provide per-identity access decisions or practical individual revocation.

C:

This would be a reasonable check when a campus exposes SNMPv2 community strings over a shared operations network despite a requirement for authenticated encrypted monitoring, but is less direct for the issue at hand: a common PSK does not provide per-identity access decisions or practical individual revocation.

D:

This would be a reasonable check when a switch permits plaintext Telnet administrative sessions across an untrusted guest management segment, but is less direct for the issue at hand: a common PSK does not provide per-identity access decisions or practical individual revocation.

Question 930

A guest SSID is connected to a network that allows lateral traffic into staff database servers. Which first diagnostic check is most useful before changing the network?

  1. Inspect the AAA transport type, route and encryption policy.
  2. Inspect client guest role and effective ACL hits for prohibited destinations.
  3. Compare MAC, certificate and profiling attributes for the admitted endpoint.
  4. Inspect matched firewall rules for IoT-to-NAC management requests.

Explanation

Correct Answer

B:

This check collects evidence at the layer implicated by the symptom: the guest role's effective firewall policy permits unintended east-west and internal traffic. Examine the evidence before choosing the corrective change.

Incorrect Answers

A:

This would be a reasonable check when a campus uses an unencrypted RADIUS configuration across a transport network where message content protection is mandated, but is less direct for the issue at hand: the guest role's effective firewall policy permits unintended east-west and internal traffic.

C:

This would be a reasonable check when a printer is allowed into a protected VLAN solely because its hostname matches an approved naming prefix, but is less direct for the issue at hand: the guest role's effective firewall policy permits unintended east-west and internal traffic.

D:

This would be a reasonable check when a branch firewall permits internal IoT devices to initiate sessions to the NAC administration console by a legacy broad access rule, but is less direct for the issue at hand: the guest role's effective firewall policy permits unintended east-west and internal traffic.