HP HPE7-A01 Practice Test 44
Question 430
A campus aggregation OSPF peer stays in an early adjacency state following a mismatch in hello intervals and network type. After the root cause is confirmed, which narrowly scoped configuration action should be selected?
- Enforce passive-interface policy to endpoint-only VLANs and enable peering only on authorized router-facing interfaces.
- Enforce matching approved OSPF authentication parameters and key rotation to both routing peers.
- Constrain redistribution to approved prefixes and use loop-prevention tags or filtering where the topology requires them.
- Match the intended OSPF area and compatible adjacency parameters without changing unrelated routing peers.
Explanation
Correct Answer
D:Match the intended OSPF area and compatible adjacency parameters without changing unrelated routing peers. OSPF neighbors must agree on core adjacency properties; Ethernet link status and matching IP ranges alone are insufficient. The proposed configuration targets the stated dependency without broadening unrelated access. The decision applies to the described ospf area and neighbor state situation.
Incorrect Answers
A:Enforce passive-interface policy to endpoint-only VLANs and enable peering only on authorized router-facing interfaces. This instead concerns ospf passive interface policy. A passive OSPF interface advertises its connected prefix without initiating neighbor exchange, making interface role critical. It would not implement the specifically required change. The immediate problem concerns ospf area and neighbor state.
B:Enforce matching approved OSPF authentication parameters and key rotation to both routing peers. This instead concerns ospf authentication mismatch. Routing protocol authentication must agree between neighbors; a mismatched secret prevents trusted control-plane exchange. It would not implement the specifically required change. The immediate problem concerns ospf area and neighbor state.
C:Constrain redistribution to approved prefixes and use loop-prevention tags or filtering where the topology requires them. This instead concerns ospf route redistribution and loops. Redistribution moves routes between origins; without scope and loop controls, connectivity can change across many sites at once. It would not implement the specifically required change. The immediate problem concerns ospf area and neighbor state.
Question 431
A campus aggregation OSPF peer stays in an early adjacency state following a mismatch in hello intervals and network type. A deployment job reports success. Which observed result would actually validate the affected service?
- Confirm user VLANs are advertised as needed without OSPF hello adjacency attempts, while intended routed neighbors become Full.
- Confirm the OSPF neighbor rebuilds to Full with no new authentication failure events.
- Verify neighbor state reaches Full and the expected link-state advertisements and routes appear.
- Confirm only authorized external routes are advertised and preferred next hops remain stable at a remote peer.
Explanation
Correct Answer
C:Verify neighbor state reaches Full and the expected link-state advertisements and routes appear. OSPF neighbors must agree on core adjacency properties; Ethernet link status and matching IP ranges alone are insufficient. The result tests actual working behavior, not merely a saved configuration. The decision applies to the described ospf area and neighbor state situation.
Incorrect Answers
A:Confirm user VLANs are advertised as needed without OSPF hello adjacency attempts, while intended routed neighbors become Full. This instead concerns ospf passive interface policy. A passive OSPF interface advertises its connected prefix without initiating neighbor exchange, making interface role critical. It would not establish that this function actually works. The immediate problem concerns ospf area and neighbor state.
B:Confirm the OSPF neighbor rebuilds to Full with no new authentication failure events. This instead concerns ospf authentication mismatch. Routing protocol authentication must agree between neighbors; a mismatched secret prevents trusted control-plane exchange. It would not establish that this function actually works. The immediate problem concerns ospf area and neighbor state.
D:Confirm only authorized external routes are advertised and preferred next hops remain stable at a remote peer. This instead concerns ospf route redistribution and loops. Redistribution moves routes between origins; without scope and loop controls, connectivity can change across many sites at once. It would not establish that this function actually works. The immediate problem concerns ospf area and neighbor state.
Question 432
A campus aggregation OSPF peer stays in an early adjacency state following a mismatch in hello intervals and network type. The review requires TWO complementary actions: one diagnostic check and one controlled configuration remedy. Select TWO actions that together meet those requirements.
- Review OSPF passive-interface selection and whether a real routing neighbor is expected on that link.
- Review OSPF interface area, hello/dead timers, network type and neighbor state on both peers.
- Enforce matching approved OSPF authentication parameters and key rotation to both routing peers.
- Match the intended OSPF area and compatible adjacency parameters without changing unrelated routing peers.
Explanation
Correct Answers
B:Review OSPF interface area, hello/dead timers, network type and neighbor state on both peers. OSPF neighbors must agree on core adjacency properties; Ethernet link status and matching IP ranges alone are insufficient. This is the required diagnosis or controlled remedy; the other keyed action supplies the complementary role. The decision applies to the described ospf area and neighbor state situation.
D:Match the intended OSPF area and compatible adjacency parameters without changing unrelated routing peers. OSPF neighbors must agree on core adjacency properties; Ethernet link status and matching IP ranges alone are insufficient. This is the required diagnosis or controlled remedy; the other keyed action supplies the complementary role. The decision applies to the described ospf area and neighbor state situation.
Incorrect Answers
A:Review OSPF passive-interface selection and whether a real routing neighbor is expected on that link. This instead concerns ospf passive interface policy. A passive OSPF interface advertises its connected prefix without initiating neighbor exchange, making interface role critical. It is not one of the requested paired diagnosis and configuration actions. The immediate problem concerns ospf area and neighbor state.
C:Enforce matching approved OSPF authentication parameters and key rotation to both routing peers. This instead concerns ospf authentication mismatch. Routing protocol authentication must agree between neighbors; a mismatched secret prevents trusted control-plane exchange. It is not one of the requested paired diagnosis and configuration actions. The immediate problem concerns ospf area and neighbor state.
Question 433
A campus switch accidentally runs OSPF hello packets toward client-facing VLANs even though no router should peer there. Which investigation would best isolate the immediate network dependency?
- Inspect OSPF authentication mode, key IDs and error logs on both ends of the adjacency.
- Inspect OSPF passive-interface selection and whether a real routing neighbor is expected on that link.
- Inspect redistribution policy, route tags, imported prefix filters and the resulting external LSA path.
- Inspect effective OSPF interface costs and the selected path in each relevant routing table.
Explanation
Correct Answer
B:Inspect OSPF passive-interface selection and whether a real routing neighbor is expected on that link. A passive OSPF interface advertises its connected prefix without initiating neighbor exchange, making interface role critical. The evidence check isolates the relevant prerequisite before a disruptive change. The decision applies to the described ospf passive interface policy situation.
Incorrect Answers
A:Inspect OSPF authentication mode, key IDs and error logs on both ends of the adjacency. This instead concerns ospf authentication mismatch. Routing protocol authentication must agree between neighbors; a mismatched secret prevents trusted control-plane exchange. It does not isolate the cause of the stated incident. The immediate problem concerns ospf passive interface policy.
C:Inspect redistribution policy, route tags, imported prefix filters and the resulting external LSA path. This instead concerns ospf route redistribution and loops. Redistribution moves routes between origins; without scope and loop controls, connectivity can change across many sites at once. It does not isolate the cause of the stated incident. The immediate problem concerns ospf passive interface policy.
D:Inspect effective OSPF interface costs and the selected path in each relevant routing table. This instead concerns ospf path cost preference. OSPF route cost influences path selection among eligible OSPF paths; it must reflect planned traffic engineering rather than simply interface link state. It does not isolate the cause of the stated incident. The immediate problem concerns ospf passive interface policy.
Question 434
A campus switch accidentally runs OSPF hello packets toward client-facing VLANs even though no router should peer there. Which specific corrective design step best meets the stated campus requirement?
- Apply passive-interface policy to endpoint-only VLANs and enable peering only on authorized router-facing interfaces.
- Apply matching approved OSPF authentication parameters and key rotation to both routing peers.
- Limit redistribution to approved prefixes and use loop-prevention tags or filtering where the topology requires them.
- Set intentional supported OSPF costs consistent with design and bandwidth expectations.
Explanation
Correct Answer
A:Apply passive-interface policy to endpoint-only VLANs and enable peering only on authorized router-facing interfaces. A passive OSPF interface advertises its connected prefix without initiating neighbor exchange, making interface role critical. The proposed configuration targets the stated dependency without broadening unrelated access. The decision applies to the described ospf passive interface policy situation.
Incorrect Answers
B:Apply matching approved OSPF authentication parameters and key rotation to both routing peers. This instead concerns ospf authentication mismatch. Routing protocol authentication must agree between neighbors; a mismatched secret prevents trusted control-plane exchange. It would not implement the specifically required change. The immediate problem concerns ospf passive interface policy.
C:Limit redistribution to approved prefixes and use loop-prevention tags or filtering where the topology requires them. This instead concerns ospf route redistribution and loops. Redistribution moves routes between origins; without scope and loop controls, connectivity can change across many sites at once. It would not implement the specifically required change. The immediate problem concerns ospf passive interface policy.
D:Set intentional supported OSPF costs consistent with design and bandwidth expectations. This instead concerns ospf path cost preference. OSPF route cost influences path selection among eligible OSPF paths; it must reflect planned traffic engineering rather than simply interface link state. It would not implement the specifically required change. The immediate problem concerns ospf passive interface policy.
Question 435
A campus switch accidentally runs OSPF hello packets toward client-facing VLANs even though no router should peer there. Following a targeted change, which acceptance test would most directly demonstrate success?
- Verify the OSPF neighbor rebuilds to Full with no new authentication failure events.
- Verify only authorized external routes are advertised and preferred next hops remain stable at a remote peer.
- Verify the primary next hop is selected while the backup becomes active after a controlled primary failure.
- Verify user VLANs are advertised as needed without OSPF hello adjacency attempts, while intended routed neighbors become Full.
Explanation
Correct Answer
D:Verify user VLANs are advertised as needed without OSPF hello adjacency attempts, while intended routed neighbors become Full. A passive OSPF interface advertises its connected prefix without initiating neighbor exchange, making interface role critical. The result tests actual working behavior, not merely a saved configuration. The decision applies to the described ospf passive interface policy situation.
Incorrect Answers
A:Verify the OSPF neighbor rebuilds to Full with no new authentication failure events. This instead concerns ospf authentication mismatch. Routing protocol authentication must agree between neighbors; a mismatched secret prevents trusted control-plane exchange. It would not establish that this function actually works. The immediate problem concerns ospf passive interface policy.
B:Verify only authorized external routes are advertised and preferred next hops remain stable at a remote peer. This instead concerns ospf route redistribution and loops. Redistribution moves routes between origins; without scope and loop controls, connectivity can change across many sites at once. It would not establish that this function actually works. The immediate problem concerns ospf passive interface policy.
C:Verify the primary next hop is selected while the backup becomes active after a controlled primary failure. This instead concerns ospf path cost preference. OSPF route cost influences path selection among eligible OSPF paths; it must reflect planned traffic engineering rather than simply interface link state. It would not establish that this function actually works. The immediate problem concerns ospf passive interface policy.
Question 436
A campus switch accidentally runs OSPF hello packets toward client-facing VLANs even though no router should peer there. The change fails acceptance. What is the safest targeted restoration action?
- Restore the previous mutually valid authentication key under the change plan until coordinated rotation is complete.
- Withdraw the offending external advertisement and restore the prior filtered redistribution policy.
- Revert erroneous passive settings on designated transit interfaces and retain passive protection on client VLANs.
- Restore the prior accepted cost values if the updated metric diverts traffic unexpectedly.
Explanation
Correct Answer
C:Revert erroneous passive settings on designated transit interfaces and retain passive protection on client VLANs. A passive OSPF interface advertises its connected prefix without initiating neighbor exchange, making interface role critical. The focused rollback restores a known safe baseline before another change attempt. The decision applies to the described ospf passive interface policy situation.
Incorrect Answers
A:Restore the previous mutually valid authentication key under the change plan until coordinated rotation is complete. This instead concerns ospf authentication mismatch. Routing protocol authentication must agree between neighbors; a mismatched secret prevents trusted control-plane exchange. It would not safely roll back the relevant failed change. The immediate problem concerns ospf passive interface policy.
B:Withdraw the offending external advertisement and restore the prior filtered redistribution policy. This instead concerns ospf route redistribution and loops. Redistribution moves routes between origins; without scope and loop controls, connectivity can change across many sites at once. It would not safely roll back the relevant failed change. The immediate problem concerns ospf passive interface policy.
D:Restore the prior accepted cost values if the updated metric diverts traffic unexpectedly. This instead concerns ospf path cost preference. OSPF route cost influences path selection among eligible OSPF paths; it must reflect planned traffic engineering rather than simply interface link state. It would not safely roll back the relevant failed change. The immediate problem concerns ospf passive interface policy.
Question 437
An access VLAN is marked passive but administrators expect OSPF to build an adjacency to the downstream routed switch. Before implementing a remedy, what should the engineer check first?
- Review OSPF authentication mode, key IDs and error logs on both ends of the adjacency.
- Review OSPF passive-interface selection and whether a real routing neighbor is expected on that link.
- Review redistribution policy, route tags, imported prefix filters and the resulting external LSA path.
- Review effective OSPF interface costs and the selected path in each relevant routing table.
Explanation
Correct Answer
B:Review OSPF passive-interface selection and whether a real routing neighbor is expected on that link. A passive OSPF interface advertises its connected prefix without initiating neighbor exchange, making interface role critical. The evidence check isolates the relevant prerequisite before a disruptive change. The decision applies to the described ospf passive interface policy situation.
Incorrect Answers
A:Review OSPF authentication mode, key IDs and error logs on both ends of the adjacency. This instead concerns ospf authentication mismatch. Routing protocol authentication must agree between neighbors; a mismatched secret prevents trusted control-plane exchange. It does not isolate the cause of the stated incident. The immediate problem concerns ospf passive interface policy.
C:Review redistribution policy, route tags, imported prefix filters and the resulting external LSA path. This instead concerns ospf route redistribution and loops. Redistribution moves routes between origins; without scope and loop controls, connectivity can change across many sites at once. It does not isolate the cause of the stated incident. The immediate problem concerns ospf passive interface policy.
D:Review effective OSPF interface costs and the selected path in each relevant routing table. This instead concerns ospf path cost preference. OSPF route cost influences path selection among eligible OSPF paths; it must reflect planned traffic engineering rather than simply interface link state. It does not isolate the cause of the stated incident. The immediate problem concerns ospf passive interface policy.
Question 438
An access VLAN is marked passive but administrators expect OSPF to build an adjacency to the downstream routed switch. After the root cause is confirmed, which narrowly scoped configuration action should be selected?
- Enforce passive-interface policy to endpoint-only VLANs and enable peering only on authorized router-facing interfaces.
- Enforce matching approved OSPF authentication parameters and key rotation to both routing peers.
- Constrain redistribution to approved prefixes and use loop-prevention tags or filtering where the topology requires them.
- Apply intentional supported OSPF costs consistent with design and bandwidth expectations.
Explanation
Correct Answer
A:Enforce passive-interface policy to endpoint-only VLANs and enable peering only on authorized router-facing interfaces. A passive OSPF interface advertises its connected prefix without initiating neighbor exchange, making interface role critical. The proposed configuration targets the stated dependency without broadening unrelated access. The decision applies to the described ospf passive interface policy situation.
Incorrect Answers
B:Enforce matching approved OSPF authentication parameters and key rotation to both routing peers. This instead concerns ospf authentication mismatch. Routing protocol authentication must agree between neighbors; a mismatched secret prevents trusted control-plane exchange. It would not implement the specifically required change. The immediate problem concerns ospf passive interface policy.
C:Constrain redistribution to approved prefixes and use loop-prevention tags or filtering where the topology requires them. This instead concerns ospf route redistribution and loops. Redistribution moves routes between origins; without scope and loop controls, connectivity can change across many sites at once. It would not implement the specifically required change. The immediate problem concerns ospf passive interface policy.
D:Apply intentional supported OSPF costs consistent with design and bandwidth expectations. This instead concerns ospf path cost preference. OSPF route cost influences path selection among eligible OSPF paths; it must reflect planned traffic engineering rather than simply interface link state. It would not implement the specifically required change. The immediate problem concerns ospf passive interface policy.
Question 439
An access VLAN is marked passive but administrators expect OSPF to build an adjacency to the downstream routed switch. The review requires TWO complementary actions: one diagnostic check and one controlled configuration remedy. Select TWO actions that together meet those requirements.
- Review OSPF authentication mode, key IDs and error logs on both ends of the adjacency.
- Review OSPF passive-interface selection and whether a real routing neighbor is expected on that link.
- Constrain redistribution to approved prefixes and use loop-prevention tags or filtering where the topology requires them.
- Enforce passive-interface policy to endpoint-only VLANs and enable peering only on authorized router-facing interfaces.
Explanation
Correct Answers
B:Review OSPF passive-interface selection and whether a real routing neighbor is expected on that link. A passive OSPF interface advertises its connected prefix without initiating neighbor exchange, making interface role critical. This is the required diagnosis or controlled remedy; the other keyed action supplies the complementary role. The decision applies to the described ospf passive interface policy situation.
D:Enforce passive-interface policy to endpoint-only VLANs and enable peering only on authorized router-facing interfaces. A passive OSPF interface advertises its connected prefix without initiating neighbor exchange, making interface role critical. This is the required diagnosis or controlled remedy; the other keyed action supplies the complementary role. The decision applies to the described ospf passive interface policy situation.
Incorrect Answers
A:Review OSPF authentication mode, key IDs and error logs on both ends of the adjacency. This instead concerns ospf authentication mismatch. Routing protocol authentication must agree between neighbors; a mismatched secret prevents trusted control-plane exchange. It is not one of the requested paired diagnosis and configuration actions. The immediate problem concerns ospf passive interface policy.
C:Constrain redistribution to approved prefixes and use loop-prevention tags or filtering where the topology requires them. This instead concerns ospf route redistribution and loops. Redistribution moves routes between origins; without scope and loop controls, connectivity can change across many sites at once. It is not one of the requested paired diagnosis and configuration actions. The immediate problem concerns ospf passive interface policy.
Question 440
An access VLAN is marked passive but administrators expect OSPF to build an adjacency to the downstream routed switch. If the revised setting disrupts users, which controlled rollback would be most relevant?
- Reinstate the previous mutually valid authentication key under the change plan until coordinated rotation is complete.
- Withdraw the offending external advertisement and restore the prior filtered redistribution policy for the affected campus deployment.
- Undo erroneous passive settings on designated transit interfaces and retain passive protection on client VLANs.
- Reinstate the prior accepted cost values if the updated metric diverts traffic unexpectedly.
Explanation
Correct Answer
C:Undo erroneous passive settings on designated transit interfaces and retain passive protection on client VLANs. A passive OSPF interface advertises its connected prefix without initiating neighbor exchange, making interface role critical. The focused rollback restores a known safe baseline before another change attempt. The decision applies to the described ospf passive interface policy situation.
Incorrect Answers
A:Reinstate the previous mutually valid authentication key under the change plan until coordinated rotation is complete. This instead concerns ospf authentication mismatch. Routing protocol authentication must agree between neighbors; a mismatched secret prevents trusted control-plane exchange. It would not safely roll back the relevant failed change. The immediate problem concerns ospf passive interface policy.
B:Withdraw the offending external advertisement and restore the prior filtered redistribution policy for the affected campus deployment. This instead concerns ospf route redistribution and loops. Redistribution moves routes between origins; without scope and loop controls, connectivity can change across many sites at once. It would not safely roll back the relevant failed change. The immediate problem concerns ospf passive interface policy.
D:Reinstate the prior accepted cost values if the updated metric diverts traffic unexpectedly. This instead concerns ospf path cost preference. OSPF route cost influences path selection among eligible OSPF paths; it must reflect planned traffic engineering rather than simply interface link state. It would not safely roll back the relevant failed change. The immediate problem concerns ospf passive interface policy.