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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 33

Question 320

A BGP customer edge receives an unexpected default-only route after peering work. Observed: Specific destination prefixes disappear from the customer route table. What operational check best guards against this problem returning?

  1. For each approved related change, verify that the intended external BGP session establishes and the agreed routes appear. Flag recurrence if bGP remains Idle even though next-hop IPs respond to ping.
  2. For each approved related change, verify that iPv6 NLRI appears with reachable IPv6 next hops while IPv4 remains stable. Flag recurrence if the IPv4 BGP session is Established but IPv6 route exchange never starts.
  3. For each approved related change, verify that primary path wins normally and backup activates on controlled failure. Flag recurrence if backup path is preferred when an origin prefix first appears.
  4. For each approved related change, verify that the customer receives exactly the contracted specific prefixes and default behavior. Flag recurrence if specific destination prefixes disappear from the customer route table.

Explanation

Correct Answer

D:

This control asks for the same recovery evidence (The customer receives exactly the contracted specific prefixes and default behavior) and flags recurrence of the same failure (Specific destination prefixes disappear from the customer route table). It targets the underlying issue, a peer export policy was accidentally changed to advertise default only, rather than a different service problem. The exact cadence must be agreed with operations.

Incorrect Answers

A:

The proposed control is tied to the remote neighbor ip or expected autonomous-system setting does not match the peering contract, typically observed when bGP remains Idle even though next-hop IPs respond to ping. Here the target is a peer export policy was accidentally changed to advertise default only; monitor the customer receives exactly the contracted specific prefixes and default behavior.

B:

It is valid for another service scenario but checks the ipv4 bgp session is established but ipv6 route exchange never starts. This case instead needs a gate for specific destination prefixes disappear from the customer route table and evidence that the customer receives exactly the contracted specific prefixes and default behavior.

C:

This gate monitors a different failure, backup path is preferred when an origin prefix first appears. It would not detect the current problem: Specific destination prefixes disappear from the customer route table. The appropriate check requires the customer receives exactly the contracted specific prefixes and default behavior.

Question 321

An AS uses an eBGP session carrying backup routes. Observed: Backup path is preferred when an origin prefix first appears. Which targeted remediation is most appropriate for the observed condition?

  1. Coordinate a matched BGP authentication key change on both peers.
  2. Investigate CPU pressure and tune supported session resilience after addressing root load.
  3. Enable compatible BGP labeled-unicast advertisement and the required label resolution.
  4. Lower backup desirability via a consistent local policy and test withdrawal.

Explanation

Correct Answer

D:

This fix addresses the stated cause rather than an unrelated protocol. The reported symptom—Backup path is preferred when an origin prefix first appears—is consistent with import policy assigns the backup a higher preference or local preference. Use the specified correction, then verify: Primary path wins normally and backup activates on controlled failure. Preserve existing policy and tenant isolation.

Incorrect Answers

A:

This remediates tcp md5 authentication keys differ between the two bgp endpoints, normally indicated by Logs record authentication failures immediately after a key rotation. It would leave the observed problem (Backup path is preferred when an origin prefix first appears) unresolved. Address it with lower backup desirability via a consistent local policy and test withdrawal.

B:

The option may be useful when hold-time expiration precedes every outage while underlying link stays Up, but that is not the current evidence. Here, backup path is preferred when an origin prefix first appears, indicating import policy assigns the backup a higher preference or local preference. The targeted action is Lower backup desirability via a consistent local policy and test withdrawal.

C:

This change belongs to a different BGP issue: Routes arrive without usable labels in the intended labeled address family. That issue involves neighbor family negotiation or labeled-unicast export policy is incomplete. The current symptom is Backup path is preferred when an origin prefix first appears. It instead requires lower backup desirability via a consistent local policy and test withdrawal.

Question 322

An AS uses an eBGP session carrying backup routes. Observed: Backup path is preferred when an origin prefix first appears. What evidence would validate recovery from this precise failure mode?

  1. Hold timer expirations cease and the session remains Established through workload tests.
  2. Session reaches Established with no continuing TCP authentication errors.
  3. Primary path wins normally and backup activates on controlled failure.
  4. Routes carry valid labels and forwarding resolves through the expected labeled path.

Explanation

Correct Answer

C:

The intended result is Primary path wins normally and backup activates on controlled failure. It specifically verifies recovery from import policy assigns the backup a higher preference or local preference, which produced the original symptom: Backup path is preferred when an origin prefix first appears. It is stronger evidence than a generic interface-up indicator.

Incorrect Answers

A:

That observation would verify a separate fault involving control-plane processing stalls long enough to miss bgp keepalives. Its symptom is Hold-time expiration precedes every outage while underlying link stays Up. For this case the actual issue is import policy assigns the backup a higher preference or local preference, and the relevant success signal is Primary path wins normally and backup activates on controlled failure.

B:

This result is useful in another case with evidence Logs record authentication failures immediately after a key rotation. It does not test recovery from backup path is preferred when an origin prefix first appears. Check instead whether primary path wins normally and backup activates on controlled failure.

D:

It confirms an unrelated service correction: Neighbor family negotiation or labeled-unicast export policy is incomplete. The present case reports Backup path is preferred when an origin prefix first appears. Its completion test is Primary path wins normally and backup activates on controlled failure.

Question 323

An AS uses an eBGP session carrying backup routes. Observed: Backup path is preferred when an origin prefix first appears. What underlying protocol or service configuration problem best explains the evidence?

  1. Neighbor family negotiation or labeled-unicast export policy is incomplete.
  2. TCP MD5 authentication keys differ between the two BGP endpoints.
  3. Import policy assigns the backup a higher preference or local preference.
  4. Control-plane processing stalls long enough to miss BGP keepalives.

Explanation

Correct Answer

C:

Because backup path is preferred when an origin prefix first appears, the likely cause is import policy assigns the backup a higher preference or local preference. It is testable: Lower backup desirability via a consistent local policy and test withdrawal. Expected follow-up: Primary path wins normally and backup activates on controlled failure.

Incorrect Answers

A:

Neighbor family negotiation or labeled-unicast export policy is incomplete. would normally be accompanied by routes arrive without usable labels in the intended labeled address family. The observed symptom is different: Backup path is preferred when an origin prefix first appears. The likely cause is Import policy assigns the backup a higher preference or local preference.

B:

That explanation fits another condition: Logs record authentication failures immediately after a key rotation. The evidence here is Backup path is preferred when an origin prefix first appears. Its closer root cause is Import policy assigns the backup a higher preference or local preference.

D:

The stated cause is possible elsewhere but explains hold-time expiration precedes every outage while underlying link stays up, not backup path is preferred when an origin prefix first appears. This incident is better attributed to import policy assigns the backup a higher preference or local preference.

Question 324

An AS uses an eBGP session carrying backup routes. Observed: Backup path is preferred when an origin prefix first appears. Which ongoing validation gate would best detect a recurrence of this problem?

  1. For each approved related change, verify that session reaches Established with no continuing TCP authentication errors. Flag recurrence if logs record authentication failures immediately after a key rotation.
  2. For each approved related change, verify that primary path wins normally and backup activates on controlled failure. Flag recurrence if backup path is preferred when an origin prefix first appears.
  3. For each approved related change, verify that hold timer expirations cease and the session remains Established through workload tests. Flag recurrence if hold-time expiration precedes every outage while underlying link stays Up.
  4. For each approved related change, verify that routes carry valid labels and forwarding resolves through the expected labeled path. Flag recurrence if routes arrive without usable labels in the intended labeled address family.

Explanation

Correct Answer

B:

A useful regression gate tests whether primary path wins normally and backup activates on controlled failure and alerts when backup path is preferred when an origin prefix first appears. This directly checks the technical weakness: Import policy assigns the backup a higher preference or local preference. The gate is derived from the fictional incident and is not an independent Juniper engineer signoff.

Incorrect Answers

A:

It is valid for another service scenario but checks logs record authentication failures immediately after a key rotation. This case instead needs a gate for backup path is preferred when an origin prefix first appears and evidence that primary path wins normally and backup activates on controlled failure.

C:

The proposed control is tied to control-plane processing stalls long enough to miss bgp keepalives, typically observed when hold-time expiration precedes every outage while underlying link stays Up. Here the target is import policy assigns the backup a higher preference or local preference; monitor primary path wins normally and backup activates on controlled failure.

D:

This gate monitors a different failure, routes arrive without usable labels in the intended labeled address family. It would not detect the current problem: Backup path is preferred when an origin prefix first appears. The appropriate check requires primary path wins normally and backup activates on controlled failure.

Question 325

A BGP control-plane router has intermittent session resets under high CPU load. Observed: Hold-time expiration precedes every outage while underlying link stays Up. Which change most directly corrects the failure while respecting the existing service boundary?

  1. Configure the intended MP-BGP family between valid PE and reflector peers.
  2. Set compatible source loopback and multihop reachability for the authorized design.
  3. Apply an agreed maximum-prefix threshold and protect recovery behavior.
  4. Investigate CPU pressure and tune supported session resilience after addressing root load.

Explanation

Correct Answer

D:

The observed condition is Hold-time expiration precedes every outage while underlying link stays Up. That indicates control-plane processing stalls long enough to miss bgp keepalives. Applying the proposed remedy directly changes that condition. A concrete completion check is: Hold timer expirations cease and the session remains Established through workload tests.

Incorrect Answers

A:

This remediates multiprotocol capabilities are not negotiated consistently, normally indicated by Route-monitor output shows no VPNv4 capabilities agreed. It would leave the observed problem (Hold-time expiration precedes every outage while underlying link stays Up) unresolved. Address it with investigate CPU pressure and tune supported session resilience after addressing root load.

B:

This change belongs to a different BGP issue: The BGP session cannot form across the connected transport. That issue involves the multi-hop ebgp transport and update-source configuration are incomplete. The current symptom is Hold-time expiration precedes every outage while underlying link stays Up. It instead requires investigate CPU pressure and tune supported session resilience after addressing root load.

C:

The option may be useful when the routing table grows beyond contracted limits after a misconfiguration, but that is not the current evidence. Here, hold-time expiration precedes every outage while underlying link stays Up, indicating control-plane processing stalls long enough to miss bgp keepalives. The targeted action is Investigate CPU pressure and tune supported session resilience after addressing root load.

Question 326

A BGP control-plane router has intermittent session resets under high CPU load. Observed: Hold-time expiration precedes every outage while underlying link stays Up. After the correction, which result would most convincingly show that this fault is resolved?

  1. VPNv4 prefixes and their route targets appear at authorized receivers.
  2. The loopback peering establishes over the approved routed path.
  3. Excess announcements trigger the intended safety action before resource exhaustion.
  4. Hold timer expirations cease and the session remains Established through workload tests.

Explanation

Correct Answer

D:

After investigate CPU pressure and tune supported session resilience after addressing root load, inspect whether hold timer expirations cease and the session remains Established through workload tests. This closes the loop between the reported observation (Hold-time expiration precedes every outage while underlying link stays Up) and the underlying issue (Control-plane processing stalls long enough to miss BGP keepalives).

Incorrect Answers

A:

This result is useful in another case with evidence Route-monitor output shows no VPNv4 capabilities agreed. It does not test recovery from hold-time expiration precedes every outage while underlying link stays up. Check instead whether hold timer expirations cease and the session remains Established through workload tests.

B:

It confirms an unrelated service correction: The multi-hop eBGP transport and update-source configuration are incomplete. The present case reports Hold-time expiration precedes every outage while underlying link stays Up. Its completion test is Hold timer expirations cease and the session remains Established through workload tests.

C:

That observation would verify a separate fault involving bgp prefix-limit protection was not configured for this customer session. Its symptom is The routing table grows beyond contracted limits after a misconfiguration. For this case the actual issue is control-plane processing stalls long enough to miss bgp keepalives, and the relevant success signal is Hold timer expirations cease and the session remains Established through workload tests.

Question 327

A BGP control-plane router has intermittent session resets under high CPU load. Observed: Hold-time expiration precedes every outage while underlying link stays Up. Which root cause is most consistent with this symptom?

  1. Control-plane processing stalls long enough to miss BGP keepalives.
  2. BGP prefix-limit protection was not configured for this customer session.
  3. Multiprotocol capabilities are not negotiated consistently.
  4. The multi-hop eBGP transport and update-source configuration are incomplete.

Explanation

Correct Answer

A:

The reported evidence—Hold-time expiration precedes every outage while underlying link stays Up—supports control-plane processing stalls long enough to miss bgp keepalives. The appropriate intervention is to investigate CPU pressure and tune supported session resilience after addressing root load, with confirmation from hold timer expirations cease and the session remains Established through workload tests. Other causes require actual device-state verification.

Incorrect Answers

B:

The stated cause is possible elsewhere but explains the routing table grows beyond contracted limits after a misconfiguration, not hold-time expiration precedes every outage while underlying link stays up. This incident is better attributed to control-plane processing stalls long enough to miss bgp keepalives.

C:

That explanation fits another condition: Route-monitor output shows no VPNv4 capabilities agreed. The evidence here is Hold-time expiration precedes every outage while underlying link stays Up. Its closer root cause is Control-plane processing stalls long enough to miss BGP keepalives.

D:

The multi-hop eBGP transport and update-source configuration are incomplete. would normally be accompanied by the bgp session cannot form across the connected transport. The observed symptom is different: Hold-time expiration precedes every outage while underlying link stays Up. The likely cause is Control-plane processing stalls long enough to miss BGP keepalives.

Question 328

A BGP control-plane router has intermittent session resets under high CPU load. Observed: Hold-time expiration precedes every outage while underlying link stays Up. Which change-acceptance control is most relevant to preventing this exact failure?

  1. For each approved related change, verify that vPNv4 prefixes and their route targets appear at authorized receivers. Flag recurrence if route-monitor output shows no VPNv4 capabilities agreed.
  2. For each approved related change, verify that hold timer expirations cease and the session remains Established through workload tests. Flag recurrence if hold-time expiration precedes every outage while underlying link stays Up.
  3. For each approved related change, verify that excess announcements trigger the intended safety action before resource exhaustion. Flag recurrence if the routing table grows beyond contracted limits after a misconfiguration.
  4. For each approved related change, verify that the loopback peering establishes over the approved routed path. Flag recurrence if the BGP session cannot form across the connected transport.

Explanation

Correct Answer

B:

The control is specific to the initial failure. It requires the result Hold timer expirations cease and the session remains Established through workload tests. and treats Hold-time expiration precedes every outage while underlying link stays Up. as a failure signal. The causal concern is control-plane processing stalls long enough to miss bgp keepalives.

Incorrect Answers

A:

It is valid for another service scenario but checks route-monitor output shows no vpnv4 capabilities agreed. This case instead needs a gate for hold-time expiration precedes every outage while underlying link stays up and evidence that hold timer expirations cease and the session remains Established through workload tests.

C:

The proposed control is tied to bgp prefix-limit protection was not configured for this customer session, typically observed when the routing table grows beyond contracted limits after a misconfiguration. Here the target is control-plane processing stalls long enough to miss bgp keepalives; monitor hold timer expirations cease and the session remains Established through workload tests.

D:

This gate monitors a different failure, the bgp session cannot form across the connected transport. It would not detect the current problem: Hold-time expiration precedes every outage while underlying link stays Up. The appropriate check requires hold timer expirations cease and the session remains Established through workload tests.

Question 329

An edge BGP peer accepts IPv4 unicast but not a VPN address family. Observed: Route-monitor output shows no VPNv4 capabilities agreed. What should the routing engineer change first to address this particular symptom?

  1. Restore PE loopback transport visibility without leaking tenant routes into the core.
  2. Configure the intended MP-BGP family between valid PE and reflector peers.
  3. Configure intentional reflector client groups or the necessary supplementary sessions.
  4. Implement scoped prefix filters and approved validation mechanisms for the peering.

Explanation

Correct Answer

B:

The decisive evidence is that Route-monitor output shows no VPNv4 capabilities agreed. This follows from multiprotocol capabilities are not negotiated consistently. The focused remedy is to configure the intended MP-BGP family between valid PE and reflector peers. Confirm improvement when vPNv4 prefixes and their route targets appear at authorized receivers. Validate on an approved lab or change window before touching production.

Incorrect Answers

A:

This change belongs to a different BGP issue: One site receives the route with a next hop it cannot resolve. That issue involves pe loopback reachability is missing from the transport igp. The current symptom is Route-monitor output shows no VPNv4 capabilities agreed. It instead requires configure the intended MP-BGP family between valid PE and reflector peers.

C:

The option may be useful when some nonclient speakers still cannot learn routes from other nonclients, but that is not the current evidence. Here, route-monitor output shows no VPNv4 capabilities agreed, indicating multiprotocol capabilities are not negotiated consistently. The targeted action is Configure the intended MP-BGP family between valid PE and reflector peers.

D:

This remediates import policy lacks authorized prefix and route-origin controls, normally indicated by Thousands of leaked more-specific prefixes are accepted without validation. It would leave the observed problem (Route-monitor output shows no VPNv4 capabilities agreed) unresolved. Address it with configure the intended MP-BGP family between valid PE and reflector peers.

Question 330

An edge BGP peer accepts IPv4 unicast but not a VPN address family. Observed: Route-monitor output shows no VPNv4 capabilities agreed. Which acceptance observation best confirms that the proposed change worked?

  1. Unauthorized leaked prefixes are rejected while legitimate transit announcements remain.
  2. The VPN prefix resolves to a valid provider transport path.
  3. All intended iBGP speakers receive the eligible reflected NLRI.
  4. VPNv4 prefixes and their route targets appear at authorized receivers.

Explanation

Correct Answer

D:

This acceptance criterion tests the actual fault. The source evidence was Route-monitor output shows no VPNv4 capabilities agreed. The correction addresses multiprotocol capabilities are not negotiated consistently; success requires vPNv4 prefixes and their route targets appear at authorized receivers.

Incorrect Answers

A:

This result is useful in another case with evidence Thousands of leaked more-specific prefixes are accepted without validation. It does not test recovery from route-monitor output shows no vpnv4 capabilities agreed. Check instead whether vPNv4 prefixes and their route targets appear at authorized receivers.

B:

It confirms an unrelated service correction: PE loopback reachability is missing from the transport IGP. The present case reports Route-monitor output shows no VPNv4 capabilities agreed. Its completion test is VPNv4 prefixes and their route targets appear at authorized receivers.

C:

That observation would verify a separate fault involving route reflection only propagates paths according to client and nonclient advertisement rules. Its symptom is Some nonclient speakers still cannot learn routes from other nonclients. For this case the actual issue is multiprotocol capabilities are not negotiated consistently, and the relevant success signal is VPNv4 prefixes and their route targets appear at authorized receivers.

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