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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 23

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.

Question 221

A route reflector is added to a large iBGP provider AS. Observed: Some nonclient speakers still cannot learn routes from other nonclients. What should the routing engineer change first to address this particular symptom?

  1. Investigate CPU pressure and tune supported session resilience after addressing root load.
  2. Configure intentional reflector client groups or the necessary supplementary sessions.
  3. Establish a coherent route-reflector cluster identity policy.
  4. Implement scoped prefix filters and approved validation mechanisms for the peering.

Explanation

Correct Answer

B:

The decisive evidence is that Some nonclient speakers still cannot learn routes from other nonclients. This follows from route reflection only propagates paths according to client and nonclient advertisement rules. The focused remedy is to configure intentional reflector client groups or the necessary supplementary sessions. Confirm improvement when all intended iBGP speakers receive the eligible reflected NLRI. Validate on an approved lab or change window before touching production.

Incorrect Answers

A:

This remediates control-plane processing stalls long enough to miss bgp keepalives, normally indicated by Hold-time expiration precedes every outage while underlying link stays Up. It would leave the observed problem (Some nonclient speakers still cannot learn routes from other nonclients) unresolved. Address it with configure intentional reflector client groups or the necessary supplementary sessions.

C:

This change belongs to a different BGP issue: Clients sporadically reject an otherwise reachable reflected route. That issue involves an inconsistent cluster-id configuration creates route-loop prevention mismatches. The current symptom is Some nonclient speakers still cannot learn routes from other nonclients. It instead requires configure intentional reflector client groups or the necessary supplementary sessions.

D:

The option may be useful when thousands of leaked more-specific prefixes are accepted without validation, but that is not the current evidence. Here, some nonclient speakers still cannot learn routes from other nonclients, indicating route reflection only propagates paths according to client and nonclient advertisement rules. The targeted action is Configure intentional reflector client groups or the necessary supplementary sessions.

Question 222

A route reflector is added to a large iBGP provider AS. Observed: Some nonclient speakers still cannot learn routes from other nonclients. Which acceptance observation best confirms that the proposed change worked?

  1. Reflected routes carry valid originator and cluster attributes without incorrect rejection.
  2. All intended iBGP speakers receive the eligible reflected NLRI.
  3. Hold timer expirations cease and the session remains Established through workload tests.
  4. Unauthorized leaked prefixes are rejected while legitimate transit announcements remain.

Explanation

Correct Answer

B:

This acceptance criterion tests the actual fault. The source evidence was Some nonclient speakers still cannot learn routes from other nonclients. The correction addresses route reflection only propagates paths according to client and nonclient advertisement rules; success requires all intended iBGP speakers receive the eligible reflected NLRI.

Incorrect Answers

A:

It confirms an unrelated service correction: An inconsistent cluster-ID configuration creates route-loop prevention mismatches. The present case reports Some nonclient speakers still cannot learn routes from other nonclients. Its completion test is All intended iBGP speakers receive the eligible reflected NLRI.

C:

This result is useful in another case with evidence Hold-time expiration precedes every outage while underlying link stays Up. It does not test recovery from some nonclient speakers still cannot learn routes from other nonclients. Check instead whether all intended iBGP speakers receive the eligible reflected NLRI.

D:

That observation would verify a separate fault involving import policy lacks authorized prefix and route-origin controls. Its symptom is Thousands of leaked more-specific prefixes are accepted without validation. For this case the actual issue is route reflection only propagates paths according to client and nonclient advertisement rules, and the relevant success signal is All intended iBGP speakers receive the eligible reflected NLRI.

Question 223

A route reflector is added to a large iBGP provider AS. Observed: Some nonclient speakers still cannot learn routes from other nonclients. What is the most likely source of the observed routing or service failure?

  1. Import policy lacks authorized prefix and route-origin controls.
  2. An inconsistent cluster-ID configuration creates route-loop prevention mismatches.
  3. Route reflection only propagates paths according to client and nonclient advertisement rules.
  4. Control-plane processing stalls long enough to miss BGP keepalives.

Explanation

Correct Answer

C:

This explanation is the closest match to the observed symptom: Some nonclient speakers still cannot learn routes from other nonclients. The specified root issue is Route reflection only propagates paths according to client and nonclient advertisement rules. Repair it through configure intentional reflector client groups or the necessary supplementary sessions, then check all intended iBGP speakers receive the eligible reflected NLRI.

Incorrect Answers

A:

The stated cause is possible elsewhere but explains thousands of leaked more-specific prefixes are accepted without validation, not some nonclient speakers still cannot learn routes from other nonclients. This incident is better attributed to route reflection only propagates paths according to client and nonclient advertisement rules.

B:

An inconsistent cluster-ID configuration creates route-loop prevention mismatches. would normally be accompanied by clients sporadically reject an otherwise reachable reflected route. The observed symptom is different: Some nonclient speakers still cannot learn routes from other nonclients. The likely cause is Route reflection only propagates paths according to client and nonclient advertisement rules.

D:

That explanation fits another condition: Hold-time expiration precedes every outage while underlying link stays Up. The evidence here is Some nonclient speakers still cannot learn routes from other nonclients. Its closer root cause is Route reflection only propagates paths according to client and nonclient advertisement rules.

Question 224

A route reflector is added to a large iBGP provider AS. Observed: Some nonclient speakers still cannot learn routes from other nonclients. What operational check best guards against this problem returning?

  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 unauthorized leaked prefixes are rejected while legitimate transit announcements remain. Flag recurrence if thousands of leaked more-specific prefixes are accepted without validation.
  3. For each approved related change, verify that reflected routes carry valid originator and cluster attributes without incorrect rejection. Flag recurrence if clients sporadically reject an otherwise reachable reflected route.
  4. 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.

Explanation

Correct Answer

A:

This control asks for the same recovery evidence (All intended iBGP speakers receive the eligible reflected NLRI) and flags recurrence of the same failure (Some nonclient speakers still cannot learn routes from other nonclients). It targets the underlying issue, route reflection only propagates paths according to client and nonclient advertisement rules, rather than a different service problem. The exact cadence must be agreed with operations.

Incorrect Answers

B:

The proposed control is tied to import policy lacks authorized prefix and route-origin controls, typically observed when thousands of leaked more-specific prefixes are accepted without validation. Here the target is route reflection only propagates paths according to client and nonclient advertisement rules; monitor all intended iBGP speakers receive the eligible reflected NLRI.

C:

This gate monitors a different failure, clients sporadically reject an otherwise reachable reflected route. It would not detect the current problem: Some nonclient speakers still cannot learn routes from other nonclients. The appropriate check requires all intended iBGP speakers receive the eligible reflected NLRI.

D:

It is valid for another service scenario but checks hold-time expiration precedes every outage while underlying link stays up. This case instead needs a gate for some nonclient speakers still cannot learn routes from other nonclients and evidence that all intended iBGP speakers receive the eligible reflected NLRI.

Question 225

Two route reflectors share clients in a service provider core. Observed: Clients sporadically reject an otherwise reachable reflected route. Which targeted remediation is most appropriate for the observed condition?

  1. Repair IGP reachability or apply an appropriate next-hop-self policy at the ingress border.
  2. Configure the intended MP-BGP family between valid PE and reflector peers.
  3. Set a reachable eBGP next hop under the permitted export policy.
  4. Establish a coherent route-reflector cluster identity policy.

Explanation

Correct Answer

D:

This fix addresses the stated cause rather than an unrelated protocol. The reported symptom—Clients sporadically reject an otherwise reachable reflected route—is consistent with an inconsistent cluster-id configuration creates route-loop prevention mismatches. Use the specified correction, then verify: Reflected routes carry valid originator and cluster attributes without incorrect rejection. Preserve existing policy and tenant isolation.

Incorrect Answers

A:

The option may be useful when peers see the advertised prefix but cannot install it in their RIBs, but that is not the current evidence. Here, clients sporadically reject an otherwise reachable reflected route, indicating an inconsistent cluster-id configuration creates route-loop prevention mismatches. The targeted action is Establish a coherent route-reflector cluster identity policy.

B:

This change belongs to a different BGP issue: Route-monitor output shows no VPNv4 capabilities agreed. That issue involves multiprotocol capabilities are not negotiated consistently. The current symptom is Clients sporadically reject an otherwise reachable reflected route. It instead requires establish a coherent route-reflector cluster identity policy.

C:

This remediates the exported next-hop attribute is inappropriate for the external path, normally indicated by The route appears locally but its next-hop address fails the remote peer's reachability checks. It would leave the observed problem (Clients sporadically reject an otherwise reachable reflected route) unresolved. Address it with establish a coherent route-reflector cluster identity policy.

Question 226

Two route reflectors share clients in a service provider core. Observed: Clients sporadically reject an otherwise reachable reflected route. What evidence would validate recovery from this precise failure mode?

  1. The prefix becomes active with a resolvable BGP next hop.
  2. Remote neighbor installs and forwards through the authorized next hop.
  3. Reflected routes carry valid originator and cluster attributes without incorrect rejection.
  4. VPNv4 prefixes and their route targets appear at authorized receivers.

Explanation

Correct Answer

C:

The intended result is Reflected routes carry valid originator and cluster attributes without incorrect rejection. It specifically verifies recovery from an inconsistent cluster-id configuration creates route-loop prevention mismatches, which produced the original symptom: Clients sporadically reject an otherwise reachable reflected route. It is stronger evidence than a generic interface-up indicator.

Incorrect Answers

A:

That observation would verify a separate fault involving the advertised bgp next hop is unreachable in the underlay. Its symptom is Peers see the advertised prefix but cannot install it in their RIBs. For this case the actual issue is an inconsistent cluster-id configuration creates route-loop prevention mismatches, and the relevant success signal is Reflected routes carry valid originator and cluster attributes without incorrect rejection.

B:

This result is useful in another case with evidence The route appears locally but its next-hop address fails the remote peer's reachability checks. It does not test recovery from clients sporadically reject an otherwise reachable reflected route. Check instead whether reflected routes carry valid originator and cluster attributes without incorrect rejection.

D:

It confirms an unrelated service correction: Multiprotocol capabilities are not negotiated consistently. The present case reports Clients sporadically reject an otherwise reachable reflected route. Its completion test is Reflected routes carry valid originator and cluster attributes without incorrect rejection.

Question 227

Two route reflectors share clients in a service provider core. Observed: Clients sporadically reject an otherwise reachable reflected route. What underlying protocol or service configuration problem best explains the evidence?

  1. The exported next-hop attribute is inappropriate for the external path.
  2. Multiprotocol capabilities are not negotiated consistently.
  3. An inconsistent cluster-ID configuration creates route-loop prevention mismatches.
  4. The advertised BGP next hop is unreachable in the underlay.

Explanation

Correct Answer

C:

Because clients sporadically reject an otherwise reachable reflected route, the likely cause is an inconsistent cluster-id configuration creates route-loop prevention mismatches. It is testable: Establish a coherent route-reflector cluster identity policy. Expected follow-up: Reflected routes carry valid originator and cluster attributes without incorrect rejection.

Incorrect Answers

A:

That explanation fits another condition: The route appears locally but its next-hop address fails the remote peer's reachability checks. The evidence here is Clients sporadically reject an otherwise reachable reflected route. Its closer root cause is An inconsistent cluster-ID configuration creates route-loop prevention mismatches.

B:

Multiprotocol capabilities are not negotiated consistently. would normally be accompanied by route-monitor output shows no vpnv4 capabilities agreed. The observed symptom is different: Clients sporadically reject an otherwise reachable reflected route. The likely cause is An inconsistent cluster-ID configuration creates route-loop prevention mismatches.

D:

The stated cause is possible elsewhere but explains peers see the advertised prefix but cannot install it in their ribs, not clients sporadically reject an otherwise reachable reflected route. This incident is better attributed to an inconsistent cluster-id configuration creates route-loop prevention mismatches.

Question 228

Two route reflectors share clients in a service provider core. Observed: Clients sporadically reject an otherwise reachable reflected route. Which ongoing validation gate would best detect a recurrence of this problem?

  1. For each approved related change, verify that remote neighbor installs and forwards through the authorized next hop. Flag recurrence if the route appears locally but its next-hop address fails the remote peer's reachability checks.
  2. For each approved related change, verify that reflected routes carry valid originator and cluster attributes without incorrect rejection. Flag recurrence if clients sporadically reject an otherwise reachable reflected route.
  3. For each approved related change, verify that the prefix becomes active with a resolvable BGP next hop. Flag recurrence if peers see the advertised prefix but cannot install it in their RIBs.
  4. 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.

Explanation

Correct Answer

B:

A useful regression gate tests whether reflected routes carry valid originator and cluster attributes without incorrect rejection and alerts when clients sporadically reject an otherwise reachable reflected route. This directly checks the technical weakness: An inconsistent cluster-ID configuration creates route-loop prevention mismatches. 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 the route appears locally but its next-hop address fails the remote peer's reachability checks. This case instead needs a gate for clients sporadically reject an otherwise reachable reflected route and evidence that reflected routes carry valid originator and cluster attributes without incorrect rejection.

C:

The proposed control is tied to the advertised bgp next hop is unreachable in the underlay, typically observed when peers see the advertised prefix but cannot install it in their RIBs. Here the target is an inconsistent cluster-id configuration creates route-loop prevention mismatches; monitor reflected routes carry valid originator and cluster attributes without incorrect rejection.

D:

This gate monitors a different failure, route-monitor output shows no vpnv4 capabilities agreed. It would not detect the current problem: Clients sporadically reject an otherwise reachable reflected route. The appropriate check requires reflected routes carry valid originator and cluster attributes without incorrect rejection.

Question 229

An iBGP PE announces external reachability to core peers. Observed: Peers see the advertised prefix but cannot install it in their RIBs. Which change most directly corrects the failure while respecting the existing service boundary?

  1. Design appropriate secondary route visibility or add-path where supported.
  2. Correct import policy local preference consistently within the local AS.
  3. Restore PE loopback transport visibility without leaking tenant routes into the core.
  4. Repair IGP reachability or apply an appropriate next-hop-self policy at the ingress border.

Explanation

Correct Answer

D:

The observed condition is Peers see the advertised prefix but cannot install it in their RIBs. That indicates the advertised bgp next hop is unreachable in the underlay. Applying the proposed remedy directly changes that condition. A concrete completion check is: The prefix becomes active with a resolvable BGP next hop.

Incorrect Answers

A:

This change belongs to a different BGP issue: Another iBGP router receives the path but loses it when the originating client flaps. That issue involves the reflector has no alternate path because add-path or path-diversity strategy is absent. The current symptom is Peers see the advertised prefix but cannot install it in their RIBs. It instead requires repair IGP reachability or apply an appropriate next-hop-self policy at the ingress border.

B:

This remediates local preference policy unintentionally favors the expensive upstream path, normally indicated by Traffic selects an unwanted exit despite the closer contracted carrier. It would leave the observed problem (Peers see the advertised prefix but cannot install it in their RIBs) unresolved. Address it with repair IGP reachability or apply an appropriate next-hop-self policy at the ingress border.

C:

The option may be useful when one site receives the route with a next hop it cannot resolve, but that is not the current evidence. Here, peers see the advertised prefix but cannot install it in their RIBs, indicating the advertised bgp next hop is unreachable in the underlay. The targeted action is Repair IGP reachability or apply an appropriate next-hop-self policy at the ingress border.

Question 230

An iBGP PE announces external reachability to core peers. Observed: Peers see the advertised prefix but cannot install it in their RIBs. After the correction, which result would most convincingly show that this fault is resolved?

  1. The best path selects the approved egress without modifying remote providers.
  2. The prefix becomes active with a resolvable BGP next hop.
  3. The VPN prefix resolves to a valid provider transport path.
  4. A valid alternate becomes available during controlled primary route withdrawal.

Explanation

Correct Answer

B:

After repair IGP reachability or apply an appropriate next-hop-self policy at the ingress border, inspect whether the prefix becomes active with a resolvable BGP next hop. This closes the loop between the reported observation (Peers see the advertised prefix but cannot install it in their RIBs) and the underlying issue (The advertised BGP next hop is unreachable in the underlay).

Incorrect Answers

A:

This result is useful in another case with evidence Traffic selects an unwanted exit despite the closer contracted carrier. It does not test recovery from peers see the advertised prefix but cannot install it in their ribs. Check instead whether the prefix becomes active with a resolvable BGP next hop.

C:

That observation would verify a separate fault involving pe loopback reachability is missing from the transport igp. Its symptom is One site receives the route with a next hop it cannot resolve. For this case the actual issue is the advertised bgp next hop is unreachable in the underlay, and the relevant success signal is The prefix becomes active with a resolvable BGP next hop.

D:

It confirms an unrelated service correction: The reflector has no alternate path because add-path or path-diversity strategy is absent. The present case reports Peers see the advertised prefix but cannot install it in their RIBs. Its completion test is The prefix becomes active with a resolvable BGP next hop.

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