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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 24

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.

Question 231

An iBGP PE announces external reachability to core peers. Observed: Peers see the advertised prefix but cannot install it in their RIBs. Which root cause is most consistent with this symptom?

  1. Local preference policy unintentionally favors the expensive upstream path.
  2. The reflector has no alternate path because add-path or path-diversity strategy is absent.
  3. PE loopback reachability is missing from the transport IGP.
  4. The advertised BGP next hop is unreachable in the underlay.

Explanation

Correct Answer

D:

The reported evidence—Peers see the advertised prefix but cannot install it in their RIBs—supports the advertised bgp next hop is unreachable in the underlay. The appropriate intervention is to repair IGP reachability or apply an appropriate next-hop-self policy at the ingress border, with confirmation from the prefix becomes active with a resolvable BGP next hop. Other causes require actual device-state verification.

Incorrect Answers

A:

That explanation fits another condition: Traffic selects an unwanted exit despite the closer contracted carrier. The evidence here is Peers see the advertised prefix but cannot install it in their RIBs. Its closer root cause is The advertised BGP next hop is unreachable in the underlay.

B:

The reflector has no alternate path because add-path or path-diversity strategy is absent. would normally be accompanied by another ibgp router receives the path but loses it when the originating client flaps. The observed symptom is different: Peers see the advertised prefix but cannot install it in their RIBs. The likely cause is The advertised BGP next hop is unreachable in the underlay.

C:

The stated cause is possible elsewhere but explains one site receives the route with a next hop it cannot resolve, not peers see the advertised prefix but cannot install it in their ribs. This incident is better attributed to the advertised bgp next hop is unreachable in the underlay.

Question 232

An iBGP PE announces external reachability to core peers. Observed: Peers see the advertised prefix but cannot install it in their RIBs. Which change-acceptance control is most relevant to preventing this exact failure?

  1. For each approved related change, verify that a valid alternate becomes available during controlled primary route withdrawal. Flag recurrence if another iBGP router receives the path but loses it when the originating client flaps.
  2. 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.
  3. For each approved related change, verify that the VPN prefix resolves to a valid provider transport path. Flag recurrence if one site receives the route with a next hop it cannot resolve.
  4. For each approved related change, verify that the best path selects the approved egress without modifying remote providers. Flag recurrence if traffic selects an unwanted exit despite the closer contracted carrier.

Explanation

Correct Answer

B:

The control is specific to the initial failure. It requires the result The prefix becomes active with a resolvable BGP next hop. and treats Peers see the advertised prefix but cannot install it in their RIBs. as a failure signal. The causal concern is the advertised bgp next hop is unreachable in the underlay.

Incorrect Answers

A:

This gate monitors a different failure, another ibgp router receives the path but loses it when the originating client flaps. It would not detect the current problem: Peers see the advertised prefix but cannot install it in their RIBs. The appropriate check requires the prefix becomes active with a resolvable BGP next hop.

C:

The proposed control is tied to pe loopback reachability is missing from the transport igp, typically observed when one site receives the route with a next hop it cannot resolve. Here the target is the advertised bgp next hop is unreachable in the underlay; monitor the prefix becomes active with a resolvable BGP next hop.

D:

It is valid for another service scenario but checks traffic selects an unwanted exit despite the closer contracted carrier. This case instead needs a gate for peers see the advertised prefix but cannot install it in their ribs and evidence that the prefix becomes active with a resolvable BGP next hop.

Question 233

A transit ISP receives the same external destination through two upstreams. Observed: Traffic selects an unwanted exit despite the closer contracted carrier. What should the routing engineer change first to address this particular symptom?

  1. Align supported equal-path attributes and multipath settings without hiding real differences.
  2. Correct import policy local preference consistently within the local AS.
  3. Check four-octet capability negotiation and parse AS4 attributes correctly.
  4. Apply an appropriate externally visible traffic-engineering attribute or provider community.

Explanation

Correct Answer

B:

The decisive evidence is that Traffic selects an unwanted exit despite the closer contracted carrier. This follows from local preference policy unintentionally favors the expensive upstream path. The focused remedy is to correct import policy local preference consistently within the local AS. Confirm improvement when the best path selects the approved egress without modifying remote providers. Validate on an approved lab or change window before touching production.

Incorrect Answers

A:

The option may be useful when only one best next hop is installed even though both sessions advertise the route, but that is not the current evidence. Here, traffic selects an unwanted exit despite the closer contracted carrier, indicating local preference policy unintentionally favors the expensive upstream path. The targeted action is Correct import policy local preference consistently within the local AS.

C:

This remediates four-octet as capability handling is being read as an actual unexpected transit asn, normally indicated by A monitoring system reports AS_TRANS unexpectedly in the legacy view. It would leave the observed problem (Traffic selects an unwanted exit despite the closer contracted carrier) unresolved. Address it with correct import policy local preference consistently within the local AS.

D:

This change belongs to a different BGP issue: External peers continue choosing the wrong ingress despite local preference changes. That issue involves local preference is not exported to other autonomous systems. The current symptom is Traffic selects an unwanted exit despite the closer contracted carrier. It instead requires correct import policy local preference consistently within the local AS.

Question 234

A transit ISP receives the same external destination through two upstreams. Observed: Traffic selects an unwanted exit despite the closer contracted carrier. Which acceptance observation best confirms that the proposed change worked?

  1. Both peers display the intended full AS numbers and routes retain valid AS paths.
  2. Upstream route selection changes as validated by external path observations.
  3. The best path selects the approved egress without modifying remote providers.
  4. The route installs both authorized multipath next hops and failover is tested.

Explanation

Correct Answer

C:

This acceptance criterion tests the actual fault. The source evidence was Traffic selects an unwanted exit despite the closer contracted carrier. The correction addresses local preference policy unintentionally favors the expensive upstream path; success requires the best path selects the approved egress without modifying remote providers.

Incorrect Answers

A:

This result is useful in another case with evidence A monitoring system reports AS_TRANS unexpectedly in the legacy view. It does not test recovery from traffic selects an unwanted exit despite the closer contracted carrier. Check instead whether the best path selects the approved egress without modifying remote providers.

B:

It confirms an unrelated service correction: Local preference is not exported to other autonomous systems. The present case reports Traffic selects an unwanted exit despite the closer contracted carrier. Its completion test is The best path selects the approved egress without modifying remote providers.

D:

That observation would verify a separate fault involving bgp multipath eligibility criteria or policy are not satisfied. Its symptom is Only one best next hop is installed even though both sessions advertise the route. For this case the actual issue is local preference policy unintentionally favors the expensive upstream path, and the relevant success signal is The best path selects the approved egress without modifying remote providers.

Question 235

A transit ISP receives the same external destination through two upstreams. Observed: Traffic selects an unwanted exit despite the closer contracted carrier. What is the most likely source of the observed routing or service failure?

  1. Local preference is not exported to other autonomous systems.
  2. Four-octet AS capability handling is being read as an actual unexpected transit ASN.
  3. BGP multipath eligibility criteria or policy are not satisfied.
  4. Local preference policy unintentionally favors the expensive upstream path.

Explanation

Correct Answer

D:

This explanation is the closest match to the observed symptom: Traffic selects an unwanted exit despite the closer contracted carrier. The specified root issue is Local preference policy unintentionally favors the expensive upstream path. Repair it through correct import policy local preference consistently within the local AS, then check the best path selects the approved egress without modifying remote providers.

Incorrect Answers

A:

Local preference is not exported to other autonomous systems. would normally be accompanied by external peers continue choosing the wrong ingress despite local preference changes. The observed symptom is different: Traffic selects an unwanted exit despite the closer contracted carrier. The likely cause is Local preference policy unintentionally favors the expensive upstream path.

B:

That explanation fits another condition: A monitoring system reports AS_TRANS unexpectedly in the legacy view. The evidence here is Traffic selects an unwanted exit despite the closer contracted carrier. Its closer root cause is Local preference policy unintentionally favors the expensive upstream path.

C:

The stated cause is possible elsewhere but explains only one best next hop is installed even though both sessions advertise the route, not traffic selects an unwanted exit despite the closer contracted carrier. This incident is better attributed to local preference policy unintentionally favors the expensive upstream path.

Question 236

A transit ISP receives the same external destination through two upstreams. Observed: Traffic selects an unwanted exit despite the closer contracted carrier. What operational check best guards against this problem returning?

  1. For each approved related change, verify that upstream route selection changes as validated by external path observations. Flag recurrence if external peers continue choosing the wrong ingress despite local preference changes.
  2. For each approved related change, verify that the best path selects the approved egress without modifying remote providers. Flag recurrence if traffic selects an unwanted exit despite the closer contracted carrier.
  3. For each approved related change, verify that the route installs both authorized multipath next hops and failover is tested. Flag recurrence if only one best next hop is installed even though both sessions advertise the route.
  4. For each approved related change, verify that both peers display the intended full AS numbers and routes retain valid AS paths. Flag recurrence if a monitoring system reports AS_TRANS unexpectedly in the legacy view.

Explanation

Correct Answer

B:

This control asks for the same recovery evidence (The best path selects the approved egress without modifying remote providers) and flags recurrence of the same failure (Traffic selects an unwanted exit despite the closer contracted carrier). It targets the underlying issue, local preference policy unintentionally favors the expensive upstream path, rather than a different service problem. The exact cadence must be agreed with operations.

Incorrect Answers

A:

This gate monitors a different failure, external peers continue choosing the wrong ingress despite local preference changes. It would not detect the current problem: Traffic selects an unwanted exit despite the closer contracted carrier. The appropriate check requires the best path selects the approved egress without modifying remote providers.

C:

The proposed control is tied to bgp multipath eligibility criteria or policy are not satisfied, typically observed when only one best next hop is installed even though both sessions advertise the route. Here the target is local preference policy unintentionally favors the expensive upstream path; monitor the best path selects the approved egress without modifying remote providers.

D:

It is valid for another service scenario but checks a monitoring system reports as_trans unexpectedly in the legacy view. This case instead needs a gate for traffic selects an unwanted exit despite the closer contracted carrier and evidence that the best path selects the approved egress without modifying remote providers.

Question 237

A customer AS wants to favor inbound traffic through one of two links. Observed: External peers continue choosing the wrong ingress despite local preference changes. Which targeted remediation is most appropriate for the observed condition?

  1. Apply an appropriate externally visible traffic-engineering attribute or provider community.
  2. Coordinate carrier-supported communities or accepted inbound steering methods.
  3. Examine damping state and adjust the policy to approved convergence objectives.
  4. Correct scoped policy ordering and community match before route installation.

Explanation

Correct Answer

A:

This fix addresses the stated cause rather than an unrelated protocol. The reported symptom—External peers continue choosing the wrong ingress despite local preference changes—is consistent with local preference is not exported to other autonomous systems. Use the specified correction, then verify: Upstream route selection changes as validated by external path observations. Preserve existing policy and tenant isolation.

Incorrect Answers

B:

The option may be useful when new prepended announcements do not influence the chosen inbound route, but that is not the current evidence. Here, external peers continue choosing the wrong ingress despite local preference changes, indicating local preference is not exported to other autonomous systems. The targeted action is Apply an appropriate externally visible traffic-engineering attribute or provider community.

C:

This remediates route flap damping penalty and reuse thresholds remain active, normally indicated by A stable recovered prefix stays suppressed after several route updates. It would leave the observed problem (External peers continue choosing the wrong ingress despite local preference changes) unresolved. Address it with apply an appropriate externally visible traffic-engineering attribute or provider community.

D:

This change belongs to a different BGP issue: A route arrives with the right community but enters the wrong routing instance. That issue involves the policy term matches community yet assigns an unintended routing-instance action. The current symptom is External peers continue choosing the wrong ingress despite local preference changes. It instead requires apply an appropriate externally visible traffic-engineering attribute or provider community.

Question 238

A customer AS wants to favor inbound traffic through one of two links. Observed: External peers continue choosing the wrong ingress despite local preference changes. What evidence would validate recovery from this precise failure mode?

  1. The recovered prefix becomes usable after permitted penalty decay without excessive flapping.
  2. Upstream route selection changes as validated by external path observations.
  3. Inbound traffic converges to the agreed primary while the backup remains available.
  4. The permitted tagged route enters only the intended instance.

Explanation

Correct Answer

B:

The intended result is Upstream route selection changes as validated by external path observations. It specifically verifies recovery from local preference is not exported to other autonomous systems, which produced the original symptom: External peers continue choosing the wrong ingress despite local preference changes. It is stronger evidence than a generic interface-up indicator.

Incorrect Answers

A:

This result is useful in another case with evidence A stable recovered prefix stays suppressed after several route updates. It does not test recovery from external peers continue choosing the wrong ingress despite local preference changes. Check instead whether upstream route selection changes as validated by external path observations.

C:

That observation would verify a separate fault involving upstream local preference overrides the longer as-path signal. Its symptom is New prepended announcements do not influence the chosen inbound route. For this case the actual issue is local preference is not exported to other autonomous systems, and the relevant success signal is Upstream route selection changes as validated by external path observations.

D:

It confirms an unrelated service correction: The policy term matches community yet assigns an unintended routing-instance action. The present case reports External peers continue choosing the wrong ingress despite local preference changes. Its completion test is Upstream route selection changes as validated by external path observations.

Question 239

A customer AS wants to favor inbound traffic through one of two links. Observed: External peers continue choosing the wrong ingress despite local preference changes. What underlying protocol or service configuration problem best explains the evidence?

  1. The policy term matches community yet assigns an unintended routing-instance action.
  2. Upstream local preference overrides the longer AS-path signal.
  3. Local preference is not exported to other autonomous systems.
  4. Route flap damping penalty and reuse thresholds remain active.

Explanation

Correct Answer

C:

Because external peers continue choosing the wrong ingress despite local preference changes, the likely cause is local preference is not exported to other autonomous systems. It is testable: Apply an appropriate externally visible traffic-engineering attribute or provider community. Expected follow-up: Upstream route selection changes as validated by external path observations.

Incorrect Answers

A:

The policy term matches community yet assigns an unintended routing-instance action. would normally be accompanied by a route arrives with the right community but enters the wrong routing instance. The observed symptom is different: External peers continue choosing the wrong ingress despite local preference changes. The likely cause is Local preference is not exported to other autonomous systems.

B:

The stated cause is possible elsewhere but explains new prepended announcements do not influence the chosen inbound route, not external peers continue choosing the wrong ingress despite local preference changes. This incident is better attributed to local preference is not exported to other autonomous systems.

D:

That explanation fits another condition: A stable recovered prefix stays suppressed after several route updates. The evidence here is External peers continue choosing the wrong ingress despite local preference changes. Its closer root cause is Local preference is not exported to other autonomous systems.

Question 240

A customer AS wants to favor inbound traffic through one of two links. Observed: External peers continue choosing the wrong ingress despite local preference changes. Which ongoing validation gate would best detect a recurrence of this problem?

  1. For each approved related change, verify that inbound traffic converges to the agreed primary while the backup remains available. Flag recurrence if new prepended announcements do not influence the chosen inbound route.
  2. For each approved related change, verify that upstream route selection changes as validated by external path observations. Flag recurrence if external peers continue choosing the wrong ingress despite local preference changes.
  3. For each approved related change, verify that the recovered prefix becomes usable after permitted penalty decay without excessive flapping. Flag recurrence if a stable recovered prefix stays suppressed after several route updates.
  4. For each approved related change, verify that the permitted tagged route enters only the intended instance. Flag recurrence if a route arrives with the right community but enters the wrong routing instance.

Explanation

Correct Answer

B:

A useful regression gate tests whether upstream route selection changes as validated by external path observations and alerts when external peers continue choosing the wrong ingress despite local preference changes. This directly checks the technical weakness: Local preference is not exported to other autonomous systems. The gate is derived from the fictional incident and is not an independent Juniper engineer signoff.

Incorrect Answers

A:

The proposed control is tied to upstream local preference overrides the longer as-path signal, typically observed when new prepended announcements do not influence the chosen inbound route. Here the target is local preference is not exported to other autonomous systems; monitor upstream route selection changes as validated by external path observations.

C:

It is valid for another service scenario but checks a stable recovered prefix stays suppressed after several route updates. This case instead needs a gate for external peers continue choosing the wrong ingress despite local preference changes and evidence that upstream route selection changes as validated by external path observations.

D:

This gate monitors a different failure, a route arrives with the right community but enters the wrong routing instance. It would not detect the current problem: External peers continue choosing the wrong ingress despite local preference changes. The appropriate check requires upstream route selection changes as validated by external path observations.

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