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Exam Code: JN0-664

Exam Name: Service Provider Routing and Switching, Professional (JNCIP-SP)

Certification Provider: Juniper

Corresponding Certification: JNCIP-SP

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Juniper JN0-664 Practice Test 1

Question 1

Three PE routers form a point-to-point OSPF area 0 over an Ethernet transport. Observed: The adjacency stays in ExStart after a router replacement with a different interface MTU. Which change most directly corrects the failure while respecting the existing service boundary?

  1. Verify matching OSPF interface network types and the proper neighbor-formation requirements.
  2. Apply the consistent stub-area type to all routers in the area during the window.
  3. Correct the actual path MTU agreement rather than globally bypassing the MTU check.
  4. Set intended per-interface election priority and perform a controlled reelection if needed.

Explanation

Correct Answer

C:

The observed condition is The adjacency stays in ExStart after a router replacement with a different interface MTU. That indicates a database-description mtu mismatch prevents ospf database synchronization. Applying the proposed remedy directly changes that condition. A concrete completion check is: Neighbors reach Full state and exchange the same database summaries.

Incorrect Answers

A:

This change belongs to a different OSPF issue: The interface stays in 2-Way state although the operator expects a Full relationship. That issue involves link network type and adjacency expectations do not match the actual segment design. The current symptom is The adjacency stays in ExStart after a router replacement with a different interface MTU. It instead requires correct the actual path MTU agreement rather than globally bypassing the MTU check.

B:

The option may be useful when a neighbor goes down directly after changing only the ABR area mode, but that is not the current evidence. Here, the adjacency stays in ExStart after a router replacement with a different interface MTU, indicating a database-description mtu mismatch prevents ospf database synchronization. The targeted action is Correct the actual path MTU agreement rather than globally bypassing the MTU check.

D:

This remediates interface ospf priority and the non-preemptive dr election were misinterpreted, normally indicated by A new low-priority device unexpectedly becomes designated router during a maintenance election. It would leave the observed problem (The adjacency stays in ExStart after a router replacement with a different interface MTU) unresolved. Address it with correct the actual path MTU agreement rather than globally bypassing the MTU check.

Question 2

Three PE routers form a point-to-point OSPF area 0 over an Ethernet transport. Observed: The adjacency stays in ExStart after a router replacement with a different interface MTU. After the correction, which result would most convincingly show that this fault is resolved?

  1. Adjacency reaches the state appropriate for the installed point-to-point design.
  2. Neighbors reach Full state and exchange the same database summaries.
  3. The agreed DR and BDR roles remain stable through subsequent adjacency tests.
  4. All area neighbors form and the reduced external-LSA scope is as designed.

Explanation

Correct Answer

B:

After correct the actual path MTU agreement rather than globally bypassing the MTU check, inspect whether neighbors reach Full state and exchange the same database summaries. This closes the loop between the reported observation (The adjacency stays in ExStart after a router replacement with a different interface MTU) and the underlying issue (A database-description MTU mismatch prevents OSPF database synchronization).

Incorrect Answers

A:

It confirms an unrelated service correction: Link network type and adjacency expectations do not match the actual segment design. The present case reports The adjacency stays in ExStart after a router replacement with a different interface MTU. Its completion test is Neighbors reach Full state and exchange the same database summaries.

C:

This result is useful in another case with evidence A new low-priority device unexpectedly becomes designated router during a maintenance election. It does not test recovery from the adjacency stays in exstart after a router replacement with a different interface mtu. Check instead whether neighbors reach Full state and exchange the same database summaries.

D:

That observation would verify a separate fault involving area option bits in hellos do not agree with unchanged internal routers. Its symptom is A neighbor goes down directly after changing only the ABR area mode. For this case the actual issue is a database-description mtu mismatch prevents ospf database synchronization, and the relevant success signal is Neighbors reach Full state and exchange the same database summaries.

Question 3

Three PE routers form a point-to-point OSPF area 0 over an Ethernet transport. Observed: The adjacency stays in ExStart after a router replacement with a different interface MTU. Which root cause is most consistent with this symptom?

  1. Link network type and adjacency expectations do not match the actual segment design.
  2. Interface OSPF priority and the non-preemptive DR election were misinterpreted.
  3. A database-description MTU mismatch prevents OSPF database synchronization.
  4. Area option bits in Hellos do not agree with unchanged internal routers.

Explanation

Correct Answer

C:

The reported evidence—The adjacency stays in ExStart after a router replacement with a different interface MTU—supports a database-description mtu mismatch prevents ospf database synchronization. The appropriate intervention is to correct the actual path MTU agreement rather than globally bypassing the MTU check, with confirmation from neighbors reach Full state and exchange the same database summaries. Other causes require actual device-state verification.

Incorrect Answers

A:

Link network type and adjacency expectations do not match the actual segment design. would normally be accompanied by the interface stays in 2-way state although the operator expects a full relationship. The observed symptom is different: The adjacency stays in ExStart after a router replacement with a different interface MTU. The likely cause is A database-description MTU mismatch prevents OSPF database synchronization.

B:

That explanation fits another condition: A new low-priority device unexpectedly becomes designated router during a maintenance election. The evidence here is The adjacency stays in ExStart after a router replacement with a different interface MTU. Its closer root cause is A database-description MTU mismatch prevents OSPF database synchronization.

D:

The stated cause is possible elsewhere but explains a neighbor goes down directly after changing only the abr area mode, not the adjacency stays in exstart after a router replacement with a different interface mtu. This incident is better attributed to a database-description mtu mismatch prevents ospf database synchronization.

Question 4

Three PE routers form a point-to-point OSPF area 0 over an Ethernet transport. Observed: The adjacency stays in ExStart after a router replacement with a different interface MTU. Which change-acceptance control is most relevant to preventing this exact failure?

  1. For each approved related change, verify that adjacency reaches the state appropriate for the installed point-to-point design. Flag recurrence if the interface stays in 2-Way state although the operator expects a Full relationship.
  2. For each approved related change, verify that all area neighbors form and the reduced external-LSA scope is as designed. Flag recurrence if a neighbor goes down directly after changing only the ABR area mode.
  3. For each approved related change, verify that neighbors reach Full state and exchange the same database summaries. Flag recurrence if the adjacency stays in ExStart after a router replacement with a different interface MTU.
  4. For each approved related change, verify that the agreed DR and BDR roles remain stable through subsequent adjacency tests. Flag recurrence if a new low-priority device unexpectedly becomes designated router during a maintenance election.

Explanation

Correct Answer

C:

The control is specific to the initial failure. It requires the result Neighbors reach Full state and exchange the same database summaries. and treats The adjacency stays in ExStart after a router replacement with a different interface MTU. as a failure signal. The causal concern is a database-description mtu mismatch prevents ospf database synchronization.

Incorrect Answers

A:

This gate monitors a different failure, the interface stays in 2-way state although the operator expects a full relationship. It would not detect the current problem: The adjacency stays in ExStart after a router replacement with a different interface MTU. The appropriate check requires neighbors reach Full state and exchange the same database summaries.

B:

The proposed control is tied to area option bits in hellos do not agree with unchanged internal routers, typically observed when a neighbor goes down directly after changing only the ABR area mode. Here the target is a database-description mtu mismatch prevents ospf database synchronization; monitor neighbors reach Full state and exchange the same database summaries.

D:

It is valid for another service scenario but checks a new low-priority device unexpectedly becomes designated router during a maintenance election. This case instead needs a gate for the adjacency stays in exstart after a router replacement with a different interface mtu and evidence that neighbors reach Full state and exchange the same database summaries.

Question 5

Two aggregation routers share a broadcast network with multiple OSPF neighbors. Observed: A new low-priority device unexpectedly becomes designated router during a maintenance election. What should the routing engineer change first to address this particular symptom?

  1. Set intended per-interface election priority and perform a controlled reelection if needed.
  2. Stage a matched key transition on both ends with compatible authentication configuration.
  3. Align the ABR and participating area type settings for the intended reduced LSA view.
  4. Set a consistent higher reference bandwidth throughout the routing domain.

Explanation

Correct Answer

A:

The decisive evidence is that A new low-priority device unexpectedly becomes designated router during a maintenance election. This follows from interface ospf priority and the non-preemptive dr election were misinterpreted. The focused remedy is to set intended per-interface election priority and perform a controlled reelection if needed. Confirm improvement when the agreed DR and BDR roles remain stable through subsequent adjacency tests. Validate on an approved lab or change window before touching production.

Incorrect Answers

B:

The option may be useful when neighbor packets are received but rejected after routine secret rotation, but that is not the current evidence. Here, a new low-priority device unexpectedly becomes designated router during a maintenance election, indicating interface ospf priority and the non-preemptive dr election were misinterpreted. The targeted action is Set intended per-interface election priority and perform a controlled reelection if needed.

C:

This change belongs to a different OSPF issue: Branch routers still receive numerous interarea type-3 advertisements after migration. That issue involves the totally stubby default-route and interarea advertisement policy is not consistently applied. The current symptom is A new low-priority device unexpectedly becomes designated router during a maintenance election. It instead requires set intended per-interface election priority and perform a controlled reelection if needed.

D:

This remediates the common reference bandwidth is too small to distinguish modern line rates, normally indicated by Newly upgraded 100G and 10G links show identical calculated OSPF costs. It would leave the observed problem (A new low-priority device unexpectedly becomes designated router during a maintenance election) unresolved. Address it with set intended per-interface election priority and perform a controlled reelection if needed.

Question 6

Two aggregation routers share a broadcast network with multiple OSPF neighbors. Observed: A new low-priority device unexpectedly becomes designated router during a maintenance election. Which acceptance observation best confirms that the proposed change worked?

  1. The adjacency remains Full and the authentication rejection counters stop increasing.
  2. Branch LSDBs contain the expected default route without unrelated interarea prefixes.
  3. Derived costs differentiate the circuits and best-path selection follows expectations.
  4. The agreed DR and BDR roles remain stable through subsequent adjacency tests.

Explanation

Correct Answer

D:

This acceptance criterion tests the actual fault. The source evidence was A new low-priority device unexpectedly becomes designated router during a maintenance election. The correction addresses interface ospf priority and the non-preemptive dr election were misinterpreted; success requires the agreed DR and BDR roles remain stable through subsequent adjacency tests.

Incorrect Answers

A:

That observation would verify a separate fault involving the two routers reference incompatible authentication keys or key identifiers. Its symptom is Neighbor packets are received but rejected after routine secret rotation. For this case the actual issue is interface ospf priority and the non-preemptive dr election were misinterpreted, and the relevant success signal is The agreed DR and BDR roles remain stable through subsequent adjacency tests.

B:

It confirms an unrelated service correction: The totally stubby default-route and interarea advertisement policy is not consistently applied. The present case reports A new low-priority device unexpectedly becomes designated router during a maintenance election. Its completion test is The agreed DR and BDR roles remain stable through subsequent adjacency tests.

C:

This result is useful in another case with evidence Newly upgraded 100G and 10G links show identical calculated OSPF costs. It does not test recovery from a new low-priority device unexpectedly becomes designated router during a maintenance election. Check instead whether the agreed DR and BDR roles remain stable through subsequent adjacency tests.

Question 7

Two aggregation routers share a broadcast network with multiple OSPF neighbors. Observed: A new low-priority device unexpectedly becomes designated router during a maintenance election. What is the most likely source of the observed routing or service failure?

  1. The common reference bandwidth is too small to distinguish modern line rates.
  2. The totally stubby default-route and interarea advertisement policy is not consistently applied.
  3. Interface OSPF priority and the non-preemptive DR election were misinterpreted.
  4. The two routers reference incompatible authentication keys or key identifiers.

Explanation

Correct Answer

C:

This explanation is the closest match to the observed symptom: A new low-priority device unexpectedly becomes designated router during a maintenance election. The specified root issue is Interface OSPF priority and the non-preemptive DR election were misinterpreted. Repair it through set intended per-interface election priority and perform a controlled reelection if needed, then check the agreed DR and BDR roles remain stable through subsequent adjacency tests.

Incorrect Answers

A:

That explanation fits another condition: Newly upgraded 100G and 10G links show identical calculated OSPF costs. The evidence here is A new low-priority device unexpectedly becomes designated router during a maintenance election. Its closer root cause is Interface OSPF priority and the non-preemptive DR election were misinterpreted.

B:

The totally stubby default-route and interarea advertisement policy is not consistently applied. would normally be accompanied by branch routers still receive numerous interarea type-3 advertisements after migration. The observed symptom is different: A new low-priority device unexpectedly becomes designated router during a maintenance election. The likely cause is Interface OSPF priority and the non-preemptive DR election were misinterpreted.

D:

The stated cause is possible elsewhere but explains neighbor packets are received but rejected after routine secret rotation, not a new low-priority device unexpectedly becomes designated router during a maintenance election. This incident is better attributed to interface ospf priority and the non-preemptive dr election were misinterpreted.

Question 8

Two aggregation routers share a broadcast network with multiple OSPF neighbors. Observed: A new low-priority device unexpectedly becomes designated router during a maintenance election. What operational check best guards against this problem returning?

  1. For each approved related change, verify that derived costs differentiate the circuits and best-path selection follows expectations. Flag recurrence if newly upgraded 100G and 10G links show identical calculated OSPF costs.
  2. For each approved related change, verify that the adjacency remains Full and the authentication rejection counters stop increasing. Flag recurrence if neighbor packets are received but rejected after routine secret rotation.
  3. For each approved related change, verify that the agreed DR and BDR roles remain stable through subsequent adjacency tests. Flag recurrence if a new low-priority device unexpectedly becomes designated router during a maintenance election.
  4. For each approved related change, verify that branch LSDBs contain the expected default route without unrelated interarea prefixes. Flag recurrence if branch routers still receive numerous interarea type-3 advertisements after migration.

Explanation

Correct Answer

C:

This control asks for the same recovery evidence (The agreed DR and BDR roles remain stable through subsequent adjacency tests) and flags recurrence of the same failure (A new low-priority device unexpectedly becomes designated router during a maintenance election). It targets the underlying issue, interface ospf priority and the non-preemptive dr election were misinterpreted, rather than a different service problem. The exact cadence must be agreed with operations.

Incorrect Answers

A:

It is valid for another service scenario but checks newly upgraded 100g and 10g links show identical calculated ospf costs. This case instead needs a gate for a new low-priority device unexpectedly becomes designated router during a maintenance election and evidence that the agreed DR and BDR roles remain stable through subsequent adjacency tests.

B:

The proposed control is tied to the two routers reference incompatible authentication keys or key identifiers, typically observed when neighbor packets are received but rejected after routine secret rotation. Here the target is interface ospf priority and the non-preemptive dr election were misinterpreted; monitor the agreed DR and BDR roles remain stable through subsequent adjacency tests.

D:

This gate monitors a different failure, branch routers still receive numerous interarea type-3 advertisements after migration. It would not detect the current problem: A new low-priority device unexpectedly becomes designated router during a maintenance election. The appropriate check requires the agreed DR and BDR roles remain stable through subsequent adjacency tests.

Question 9

A service provider maintains OSPF totally stubby access areas behind one ABR. Observed: Branch routers still receive numerous interarea type-3 advertisements after migration. Which targeted remediation is most appropriate for the observed condition?

  1. Align the ABR and participating area type settings for the intended reduced LSA view.
  2. Narrow the route policy match and preserve unrelated prefix restrictions.
  3. Inspect NSSA ABR translator selection and enable the supported external translation behavior.
  4. Choose a supported point-to-multipoint OSPF design and correct spoke next-hop assumptions.

Explanation

Correct Answer

A:

This fix addresses the stated cause rather than an unrelated protocol. The reported symptom—Branch routers still receive numerous interarea type-3 advertisements after migration—is consistent with the totally stubby default-route and interarea advertisement policy is not consistently applied. Use the specified correction, then verify: Branch LSDBs contain the expected default route without unrelated interarea prefixes. Preserve existing policy and tenant isolation.

Incorrect Answers

B:

This remediates an export/import routing policy suppresses the intended ospf prefix, normally indicated by A needed interarea route vanishes even though it exists in the remote area's database. It would leave the observed problem (Branch routers still receive numerous interarea type-3 advertisements after migration) unresolved. Address it with align the ABR and participating area type settings for the intended reduced LSA view.

C:

The option may be useful when external routes learned by the NSSA ASBR never appear in area 0, but that is not the current evidence. Here, branch routers still receive numerous interarea type-3 advertisements after migration, indicating the totally stubby default-route and interarea advertisement policy is not consistently applied. The targeted action is Align the ABR and participating area type settings for the intended reduced LSA view.

D:

This change belongs to a different OSPF issue: A spoke cannot reach another despite each hub-spoke neighbor being Full. That issue involves ospf network type or next-hop modeling does not reflect the hub-and-spoke topology. The current symptom is Branch routers still receive numerous interarea type-3 advertisements after migration. It instead requires align the ABR and participating area type settings for the intended reduced LSA view.

Question 10

A service provider maintains OSPF totally stubby access areas behind one ABR. Observed: Branch routers still receive numerous interarea type-3 advertisements after migration. What evidence would validate recovery from this precise failure mode?

  1. Interspoke destinations resolve through expected paths and adjacencies remain healthy.
  2. The permitted prefix is visible in interarea routing while blocked routes stay blocked.
  3. The partner external prefix is represented with a valid translated LSA in the backbone.
  4. Branch LSDBs contain the expected default route without unrelated interarea prefixes.

Explanation

Correct Answer

D:

The intended result is Branch LSDBs contain the expected default route without unrelated interarea prefixes. It specifically verifies recovery from the totally stubby default-route and interarea advertisement policy is not consistently applied, which produced the original symptom: Branch routers still receive numerous interarea type-3 advertisements after migration. It is stronger evidence than a generic interface-up indicator.

Incorrect Answers

A:

It confirms an unrelated service correction: OSPF network type or next-hop modeling does not reflect the hub-and-spoke topology. The present case reports Branch routers still receive numerous interarea type-3 advertisements after migration. Its completion test is Branch LSDBs contain the expected default route without unrelated interarea prefixes.

B:

This result is useful in another case with evidence A needed interarea route vanishes even though it exists in the remote area's database. It does not test recovery from branch routers still receive numerous interarea type-3 advertisements after migration. Check instead whether branch LSDBs contain the expected default route without unrelated interarea prefixes.

C:

That observation would verify a separate fault involving type-7 to type-5 translation has not been established by an eligible nssa border router. Its symptom is External routes learned by the NSSA ASBR never appear in area 0. For this case the actual issue is the totally stubby default-route and interarea advertisement policy is not consistently applied, and the relevant success signal is Branch LSDBs contain the expected default route without unrelated interarea prefixes.

Service Provider Routing and Switching, Professional (JNCIP-SP) (JN0-664) Practice Tests