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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 22

Question 210

An upstream eBGP link migrates to a new provider router. Observed: BGP remains Idle even though next-hop IPs respond to ping. Which acceptance observation best confirms that the proposed change worked?

  1. Session reaches Established with no continuing TCP authentication errors.
  2. The intended external BGP session establishes and the agreed routes appear.
  3. Remote customer sees its contracted prefixes without provider loopbacks.
  4. IPv6 NLRI appears with reachable IPv6 next hops while IPv4 remains stable.

Explanation

Correct Answer

B:

This acceptance criterion tests the actual fault. The source evidence was BGP remains Idle even though next-hop IPs respond to ping. The correction addresses the remote neighbor ip or expected autonomous-system setting does not match the peering contract; success requires the intended external BGP session establishes and the agreed routes appear.

Incorrect Answers

A:

It confirms an unrelated service correction: TCP MD5 authentication keys differ between the two BGP endpoints. The present case reports BGP remains Idle even though next-hop IPs respond to ping. Its completion test is The intended external BGP session establishes and the agreed routes appear.

C:

This result is useful in another case with evidence The transit edge begins advertising an infrastructure loopback to an external customer. It does not test recovery from bgp remains idle even though next-hop ips respond to ping. Check instead whether the intended external BGP session establishes and the agreed routes appear.

D:

That observation would verify a separate fault involving ipv6 address-family activation is missing for that neighbor. Its symptom is The IPv4 BGP session is Established but IPv6 route exchange never starts. For this case the actual issue is the remote neighbor ip or expected autonomous-system setting does not match the peering contract, and the relevant success signal is The intended external BGP session establishes and the agreed routes appear.

Question 211

An upstream eBGP link migrates to a new provider router. Observed: BGP remains Idle even though next-hop IPs respond to ping. What is the most likely source of the observed routing or service failure?

  1. TCP MD5 authentication keys differ between the two BGP endpoints.
  2. The remote neighbor IP or expected autonomous-system setting does not match the peering contract.
  3. IPv6 address-family activation is missing for that neighbor.
  4. BGP export policy is too broad for the neighbor's contractual prefix set.

Explanation

Correct Answer

B:

This explanation is the closest match to the observed symptom: BGP remains Idle even though next-hop IPs respond to ping. The specified root issue is The remote neighbor IP or expected autonomous-system setting does not match the peering contract. Repair it through align neighbor addresses and peer AS configuration with the authorized session design, then check the intended external BGP session establishes and the agreed routes appear.

Incorrect Answers

A:

TCP MD5 authentication keys differ between the two BGP endpoints. would normally be accompanied by logs record authentication failures immediately after a key rotation. The observed symptom is different: BGP remains Idle even though next-hop IPs respond to ping. The likely cause is The remote neighbor IP or expected autonomous-system setting does not match the peering contract.

C:

The stated cause is possible elsewhere but explains the ipv4 bgp session is established but ipv6 route exchange never starts, not bgp remains idle even though next-hop ips respond to ping. This incident is better attributed to the remote neighbor ip or expected autonomous-system setting does not match the peering contract.

D:

That explanation fits another condition: The transit edge begins advertising an infrastructure loopback to an external customer. The evidence here is BGP remains Idle even though next-hop IPs respond to ping. Its closer root cause is The remote neighbor IP or expected autonomous-system setting does not match the peering contract.

Question 212

An upstream eBGP link migrates to a new provider router. Observed: BGP remains Idle even though next-hop IPs respond to ping. What operational check best guards against this problem returning?

  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 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 remote customer sees its contracted prefixes without provider loopbacks. Flag recurrence if the transit edge begins advertising an infrastructure loopback to an external customer.
  4. 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.

Explanation

Correct Answer

D:

This control asks for the same recovery evidence (The intended external BGP session establishes and the agreed routes appear) and flags recurrence of the same failure (BGP remains Idle even though next-hop IPs respond to ping). It targets the underlying issue, the remote neighbor ip or expected autonomous-system setting does not match the peering contract, rather than a different service problem. The exact cadence must be agreed with operations.

Incorrect Answers

A:

This gate monitors a different failure, logs record authentication failures immediately after a key rotation. It would not detect the current problem: BGP remains Idle even though next-hop IPs respond to ping. The appropriate check requires the intended external BGP session establishes and the agreed routes appear.

B:

The proposed control is tied to ipv6 address-family activation is missing for that neighbor, typically observed when the IPv4 BGP session is Established but IPv6 route exchange never starts. Here the target is the remote neighbor ip or expected autonomous-system setting does not match the peering contract; monitor the intended external BGP session establishes and the agreed routes appear.

C:

It is valid for another service scenario but checks the transit edge begins advertising an infrastructure loopback to an external customer. This case instead needs a gate for bgp remains idle even though next-hop ips respond to ping and evidence that the intended external BGP session establishes and the agreed routes appear.

Question 213

Two directly connected BGP peers exchange TCP SYN traffic but never complete the session. Observed: Logs record authentication failures immediately after a key rotation. Which targeted remediation is most appropriate for the observed condition?

  1. Reinstate the agreed route family and prefix export policy with validation.
  2. Set compatible source loopback and multihop reachability for the authorized design.
  3. Coordinate a matched BGP authentication key change on both peers.
  4. Enable compatible BGP labeled-unicast advertisement and the required label resolution.

Explanation

Correct Answer

C:

This fix addresses the stated cause rather than an unrelated protocol. The reported symptom—Logs record authentication failures immediately after a key rotation—is consistent with tcp md5 authentication keys differ between the two bgp endpoints. Use the specified correction, then verify: Session reaches Established with no continuing TCP authentication errors. Preserve existing policy and tenant isolation.

Incorrect Answers

A:

This change belongs to a different BGP issue: Specific destination prefixes disappear from the customer route table. That issue involves a peer export policy was accidentally changed to advertise default only. The current symptom is Logs record authentication failures immediately after a key rotation. It instead requires coordinate a matched BGP authentication key change on both peers.

B:

The option may be useful when the BGP session cannot form across the connected transport, but that is not the current evidence. Here, logs record authentication failures immediately after a key rotation, indicating tcp md5 authentication keys differ between the two bgp endpoints. The targeted action is Coordinate a matched BGP authentication key change on both peers.

D:

This remediates neighbor family negotiation or labeled-unicast export policy is incomplete, normally indicated by Routes arrive without usable labels in the intended labeled address family. It would leave the observed problem (Logs record authentication failures immediately after a key rotation) unresolved. Address it with coordinate a matched BGP authentication key change on both peers.

Question 214

Two directly connected BGP peers exchange TCP SYN traffic but never complete the session. Observed: Logs record authentication failures immediately after a key rotation. What evidence would validate recovery from this precise failure mode?

  1. The loopback peering establishes over the approved routed path.
  2. The customer receives exactly the contracted specific prefixes and default behavior.
  3. Routes carry valid labels and forwarding resolves through the expected labeled path.
  4. Session reaches Established with no continuing TCP authentication errors.

Explanation

Correct Answer

D:

The intended result is Session reaches Established with no continuing TCP authentication errors. It specifically verifies recovery from tcp md5 authentication keys differ between the two bgp endpoints, which produced the original symptom: Logs record authentication failures immediately after a key rotation. It is stronger evidence than a generic interface-up indicator.

Incorrect Answers

A:

That observation would verify a separate fault involving the multi-hop ebgp transport and update-source configuration are incomplete. Its symptom is The BGP session cannot form across the connected transport. For this case the actual issue is tcp md5 authentication keys differ between the two bgp endpoints, and the relevant success signal is Session reaches Established with no continuing TCP authentication errors.

B:

It confirms an unrelated service correction: A peer export policy was accidentally changed to advertise default only. The present case reports Logs record authentication failures immediately after a key rotation. Its completion test is Session reaches Established with no continuing TCP authentication errors.

C:

This result is useful in another case with evidence Routes arrive without usable labels in the intended labeled address family. It does not test recovery from logs record authentication failures immediately after a key rotation. Check instead whether session reaches Established with no continuing TCP authentication errors.

Question 215

Two directly connected BGP peers exchange TCP SYN traffic but never complete the session. Observed: Logs record authentication failures immediately after a key rotation. What underlying protocol or service configuration problem best explains the evidence?

  1. TCP MD5 authentication keys differ between the two BGP endpoints.
  2. Neighbor family negotiation or labeled-unicast export policy is incomplete.
  3. The multi-hop eBGP transport and update-source configuration are incomplete.
  4. A peer export policy was accidentally changed to advertise default only.

Explanation

Correct Answer

A:

Because logs record authentication failures immediately after a key rotation, the likely cause is tcp md5 authentication keys differ between the two bgp endpoints. It is testable: Coordinate a matched BGP authentication key change on both peers. Expected follow-up: Session reaches Established with no continuing TCP authentication errors.

Incorrect Answers

B:

That explanation fits another condition: Routes arrive without usable labels in the intended labeled address family. The evidence here is Logs record authentication failures immediately after a key rotation. Its closer root cause is TCP MD5 authentication keys differ between the two BGP endpoints.

C:

The stated cause is possible elsewhere but explains the bgp session cannot form across the connected transport, not logs record authentication failures immediately after a key rotation. This incident is better attributed to tcp md5 authentication keys differ between the two bgp endpoints.

D:

A peer export policy was accidentally changed to advertise default only. would normally be accompanied by specific destination prefixes disappear from the customer route table. The observed symptom is different: Logs record authentication failures immediately after a key rotation. The likely cause is TCP MD5 authentication keys differ between the two BGP endpoints.

Question 216

Two directly connected BGP peers exchange TCP SYN traffic but never complete the session. Observed: Logs record authentication failures immediately after a key rotation. Which ongoing validation gate would best detect a recurrence of this problem?

  1. 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.
  2. 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.
  3. 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.
  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:

A useful regression gate tests whether session reaches Established with no continuing TCP authentication errors and alerts when logs record authentication failures immediately after a key rotation. This directly checks the technical weakness: TCP MD5 authentication keys differ between the two BGP endpoints. 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 routes arrive without usable labels in the intended labeled address family. This case instead needs a gate for logs record authentication failures immediately after a key rotation and evidence that session reaches Established with no continuing TCP authentication errors.

C:

This gate monitors a different failure, specific destination prefixes disappear from the customer route table. It would not detect the current problem: Logs record authentication failures immediately after a key rotation. The appropriate check requires session reaches Established with no continuing TCP authentication errors.

D:

The proposed control is tied to the multi-hop ebgp transport and update-source configuration are incomplete, typically observed when the BGP session cannot form across the connected transport. Here the target is tcp md5 authentication keys differ between the two bgp endpoints; monitor session reaches Established with no continuing TCP authentication errors.

Question 217

A customer eBGP peer uses a loopback address instead of its physical interface. Observed: The BGP session cannot form across the connected transport. Which change most directly corrects the failure while respecting the existing service boundary?

  1. Set compatible source loopback and multihop reachability for the authorized design.
  2. Apply an agreed maximum-prefix threshold and protect recovery behavior.
  3. Lower backup desirability via a consistent local policy and test withdrawal.
  4. Configure intentional reflector client groups or the necessary supplementary sessions.

Explanation

Correct Answer

A:

The observed condition is The BGP session cannot form across the connected transport. That indicates the multi-hop ebgp transport and update-source configuration are incomplete. Applying the proposed remedy directly changes that condition. A concrete completion check is: The loopback peering establishes over the approved routed path.

Incorrect Answers

B:

This change belongs to a different BGP issue: The routing table grows beyond contracted limits after a misconfiguration. That issue involves bgp prefix-limit protection was not configured for this customer session. The current symptom is The BGP session cannot form across the connected transport. It instead requires set compatible source loopback and multihop reachability for the authorized design.

C:

The option may be useful when backup path is preferred when an origin prefix first appears, but that is not the current evidence. Here, the BGP session cannot form across the connected transport, indicating the multi-hop ebgp transport and update-source configuration are incomplete. The targeted action is Set compatible source loopback and multihop reachability for the authorized design.

D:

This remediates route reflection only propagates paths according to client and nonclient advertisement rules, normally indicated by Some nonclient speakers still cannot learn routes from other nonclients. It would leave the observed problem (The BGP session cannot form across the connected transport) unresolved. Address it with set compatible source loopback and multihop reachability for the authorized design.

Question 218

A customer eBGP peer uses a loopback address instead of its physical interface. Observed: The BGP session cannot form across the connected transport. After the correction, which result would most convincingly show that this fault is resolved?

  1. All intended iBGP speakers receive the eligible reflected NLRI.
  2. Excess announcements trigger the intended safety action before resource exhaustion.
  3. The loopback peering establishes over the approved routed path.
  4. Primary path wins normally and backup activates on controlled failure.

Explanation

Correct Answer

C:

After set compatible source loopback and multihop reachability for the authorized design, inspect whether the loopback peering establishes over the approved routed path. This closes the loop between the reported observation (The BGP session cannot form across the connected transport) and the underlying issue (The multi-hop eBGP transport and update-source configuration are incomplete).

Incorrect Answers

A:

This result is useful in another case with evidence Some nonclient speakers still cannot learn routes from other nonclients. It does not test recovery from the bgp session cannot form across the connected transport. Check instead whether the loopback peering establishes over the approved routed path.

B:

It confirms an unrelated service correction: BGP prefix-limit protection was not configured for this customer session. The present case reports The BGP session cannot form across the connected transport. Its completion test is The loopback peering establishes over the approved routed path.

D:

That observation would verify a separate fault involving import policy assigns the backup a higher preference or local preference. Its symptom is Backup path is preferred when an origin prefix first appears. For this case the actual issue is the multi-hop ebgp transport and update-source configuration are incomplete, and the relevant success signal is The loopback peering establishes over the approved routed path.

Question 219

A customer eBGP peer uses a loopback address instead of its physical interface. Observed: The BGP session cannot form across the connected transport. Which root cause is most consistent with this symptom?

  1. Import policy assigns the backup a higher preference or local preference.
  2. The multi-hop eBGP transport and update-source configuration are incomplete.
  3. Route reflection only propagates paths according to client and nonclient advertisement rules.
  4. BGP prefix-limit protection was not configured for this customer session.

Explanation

Correct Answer

B:

The reported evidence—The BGP session cannot form across the connected transport—supports the multi-hop ebgp transport and update-source configuration are incomplete. The appropriate intervention is to set compatible source loopback and multihop reachability for the authorized design, with confirmation from the loopback peering establishes over the approved routed path. Other causes require actual device-state verification.

Incorrect Answers

A:

The stated cause is possible elsewhere but explains backup path is preferred when an origin prefix first appears, not the bgp session cannot form across the connected transport. This incident is better attributed to the multi-hop ebgp transport and update-source configuration are incomplete.

C:

That explanation fits another condition: Some nonclient speakers still cannot learn routes from other nonclients. The evidence here is The BGP session cannot form across the connected transport. Its closer root cause is The multi-hop eBGP transport and update-source configuration are incomplete.

D:

BGP prefix-limit protection was not configured for this customer session. would normally be accompanied by the routing table grows beyond contracted limits after a misconfiguration. The observed symptom is different: The BGP session cannot form across the connected transport. The likely cause is The multi-hop eBGP transport and update-source configuration are incomplete.

Question 220

A customer eBGP peer uses a loopback address instead of its physical interface. Observed: The BGP session cannot form across the connected transport. Which change-acceptance control is most relevant to preventing this exact failure?

  1. For each approved related change, verify that all intended iBGP speakers receive the eligible reflected NLRI. Flag recurrence if some nonclient speakers still cannot learn routes from other nonclients.
  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 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

D:

The control is specific to the initial failure. It requires the result The loopback peering establishes over the approved routed path. and treats The BGP session cannot form across the connected transport. as a failure signal. The causal concern is the multi-hop ebgp transport and update-source configuration are incomplete.

Incorrect Answers

A:

It is valid for another service scenario but checks some nonclient speakers still cannot learn routes from other nonclients. This case instead needs a gate for the bgp session cannot form across the connected transport and evidence that the loopback peering establishes over the approved routed path.

B:

The proposed control is tied to import policy assigns the backup a higher preference or local preference, typically observed when backup path is preferred when an origin prefix first appears. Here the target is the multi-hop ebgp transport and update-source configuration are incomplete; monitor the loopback peering establishes over the approved routed path.

C:

This gate monitors a different failure, the routing table grows beyond contracted limits after a misconfiguration. It would not detect the current problem: The BGP session cannot form across the connected transport. The appropriate check requires the loopback peering establishes over the approved routed path.

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