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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 35

Question 340

Two neighboring eBGP routers have a mixed 16-bit and 32-bit AS numbering design. Observed: A monitoring system reports AS_TRANS unexpectedly in the legacy view. Which change-acceptance control is most relevant to preventing this exact failure?

  1. 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.
  2. 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.
  3. 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.
  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

D:

The control is specific to the initial failure. It requires the result Both peers display the intended full AS numbers and routes retain valid AS paths. and treats A monitoring system reports AS_TRANS unexpectedly in the legacy view. as a failure signal. The causal concern is four-octet as capability handling is being read as an actual unexpected transit asn.

Incorrect Answers

A:

This gate monitors a different failure, peers see the advertised prefix but cannot install it in their ribs. It would not detect the current problem: A monitoring system reports AS_TRANS unexpectedly in the legacy view. The appropriate check requires both peers display the intended full AS numbers and routes retain valid AS paths.

B:

The proposed control is tied to the reflector has no alternate path because add-path or path-diversity strategy is absent, typically observed when another iBGP router receives the path but loses it when the originating client flaps. Here the target is four-octet as capability handling is being read as an actual unexpected transit asn; monitor both peers display the intended full AS numbers and routes retain valid AS paths.

C:

It is valid for another service scenario but checks a route arrives with the right community but enters the wrong routing instance. This case instead needs a gate for a monitoring system reports as_trans unexpectedly in the legacy view and evidence that both peers display the intended full AS numbers and routes retain valid AS paths.

Question 341

A carrier stores BGP customer tags in an import routing policy. Observed: A route arrives with the right community but enters the wrong routing instance. What should the routing engineer change first to address this particular symptom?

  1. Correct scoped policy ordering and community match before route installation.
  2. Align supported equal-path attributes and multipath settings without hiding real differences.
  3. Correct import policy local preference consistently within the local AS.
  4. Repair upstream next-hop resolution rather than forcing an arbitrary best path.

Explanation

Correct Answer

A:

The decisive evidence is that A route arrives with the right community but enters the wrong routing instance. This follows from the policy term matches community yet assigns an unintended routing-instance action. The focused remedy is to correct scoped policy ordering and community match before route installation. Confirm improvement when the permitted tagged route enters only the intended instance. Validate on an approved lab or change window before touching production.

Incorrect Answers

B:

This remediates bgp multipath eligibility criteria or policy are not satisfied, normally indicated by Only one best next hop is installed even though both sessions advertise the route. It would leave the observed problem (A route arrives with the right community but enters the wrong routing instance) unresolved. Address it with correct scoped policy ordering and community match before route installation.

C:

The option may be useful when traffic selects an unwanted exit despite the closer contracted carrier, but that is not the current evidence. Here, a route arrives with the right community but enters the wrong routing instance, indicating the policy term matches community yet assigns an unintended routing-instance action. The targeted action is Correct scoped policy ordering and community match before route installation.

D:

This change belongs to a different BGP issue: A route is not selected despite the upstream session remaining Established. That issue involves the competing next hop fails recursive reachability validation. The current symptom is A route arrives with the right community but enters the wrong routing instance. It instead requires correct scoped policy ordering and community match before route installation.

Question 342

A carrier stores BGP customer tags in an import routing policy. Observed: A route arrives with the right community but enters the wrong routing instance. Which acceptance observation best confirms that the proposed change worked?

  1. The route installs both authorized multipath next hops and failover is tested.
  2. The preferred default has a valid resolved next hop and becomes active.
  3. The permitted tagged route enters only the intended instance.
  4. The best path selects the approved egress without modifying remote providers.

Explanation

Correct Answer

C:

This acceptance criterion tests the actual fault. The source evidence was A route arrives with the right community but enters the wrong routing instance. The correction addresses the policy term matches community yet assigns an unintended routing-instance action; success requires the permitted tagged route enters only the intended instance.

Incorrect Answers

A:

This result is useful in another case with evidence Only one best next hop is installed even though both sessions advertise the route. It does not test recovery from a route arrives with the right community but enters the wrong routing instance. Check instead whether the permitted tagged route enters only the intended instance.

B:

It confirms an unrelated service correction: The competing next hop fails recursive reachability validation. The present case reports A route arrives with the right community but enters the wrong routing instance. Its completion test is The permitted tagged route enters only the intended instance.

D:

That observation would verify a separate fault involving local preference policy unintentionally favors the expensive upstream path. Its symptom is Traffic selects an unwanted exit despite the closer contracted carrier. For this case the actual issue is the policy term matches community yet assigns an unintended routing-instance action, and the relevant success signal is The permitted tagged route enters only the intended instance.

Question 343

A carrier stores BGP customer tags in an import routing policy. Observed: A route arrives with the right community but enters the wrong routing instance. What is the most likely source of the observed routing or service failure?

  1. The competing next hop fails recursive reachability validation.
  2. The policy term matches community yet assigns an unintended routing-instance action.
  3. Local preference policy unintentionally favors the expensive upstream path.
  4. BGP multipath eligibility criteria or policy are not satisfied.

Explanation

Correct Answer

B:

This explanation is the closest match to the observed symptom: A route arrives with the right community but enters the wrong routing instance. The specified root issue is The policy term matches community yet assigns an unintended routing-instance action. Repair it through correct scoped policy ordering and community match before route installation, then check the permitted tagged route enters only the intended instance.

Incorrect Answers

A:

The competing next hop fails recursive reachability validation. would normally be accompanied by a route is not selected despite the upstream session remaining established. The observed symptom is different: A route arrives with the right community but enters the wrong routing instance. The likely cause is The policy term matches community yet assigns an unintended routing-instance action.

C:

The stated cause is possible elsewhere but explains traffic selects an unwanted exit despite the closer contracted carrier, not a route arrives with the right community but enters the wrong routing instance. This incident is better attributed to the policy term matches community yet assigns an unintended routing-instance action.

D:

That explanation fits another condition: Only one best next hop is installed even though both sessions advertise the route. The evidence here is A route arrives with the right community but enters the wrong routing instance. Its closer root cause is The policy term matches community yet assigns an unintended routing-instance action.

Question 344

A carrier stores BGP customer tags in an import routing policy. Observed: A route arrives with the right community but enters the wrong routing instance. What operational check best guards against this problem returning?

  1. 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.
  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 preferred default has a valid resolved next hop and becomes active. Flag recurrence if a route is not selected despite the upstream session remaining Established.
  4. 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.

Explanation

Correct Answer

A:

This control asks for the same recovery evidence (The permitted tagged route enters only the intended instance) and flags recurrence of the same failure (A route arrives with the right community but enters the wrong routing instance). It targets the underlying issue, the policy term matches community yet assigns an unintended routing-instance action, rather than a different service problem. The exact cadence must be agreed with operations.

Incorrect Answers

B:

The proposed control is tied to local preference policy unintentionally favors the expensive upstream path, typically observed when traffic selects an unwanted exit despite the closer contracted carrier. Here the target is the policy term matches community yet assigns an unintended routing-instance action; monitor the permitted tagged route enters only the intended instance.

C:

This gate monitors a different failure, a route is not selected despite the upstream session remaining established. It would not detect the current problem: A route arrives with the right community but enters the wrong routing instance. The appropriate check requires the permitted tagged route enters only the intended instance.

D:

It is valid for another service scenario but checks only one best next hop is installed even though both sessions advertise the route. This case instead needs a gate for a route arrives with the right community but enters the wrong routing instance and evidence that the permitted tagged route enters only the intended instance.

Question 345

A provider receives a default route over two external sessions. Observed: A route is not selected despite the upstream session remaining Established. Which targeted remediation is most appropriate for the observed condition?

  1. Examine damping state and adjust the policy to approved convergence objectives.
  2. Repair upstream next-hop resolution rather than forcing an arbitrary best path.
  3. Apply a narrow import filter and prefix-limit according to the service agreement.
  4. Apply an appropriate externally visible traffic-engineering attribute or provider community.

Explanation

Correct Answer

B:

This fix addresses the stated cause rather than an unrelated protocol. The reported symptom—A route is not selected despite the upstream session remaining Established—is consistent with the competing next hop fails recursive reachability validation. Use the specified correction, then verify: The preferred default has a valid resolved next hop and becomes active. Preserve existing policy and tenant isolation.

Incorrect Answers

A:

This change belongs to a different BGP issue: A stable recovered prefix stays suppressed after several route updates. That issue involves route flap damping penalty and reuse thresholds remain active. The current symptom is A route is not selected despite the upstream session remaining Established. It instead requires repair upstream next-hop resolution rather than forcing an arbitrary best path.

C:

The option may be useful when an unexpected memory spike occurs although only a few prefixes should be accepted, but that is not the current evidence. Here, a route is not selected despite the upstream session remaining Established, indicating the competing next hop fails recursive reachability validation. The targeted action is Repair upstream next-hop resolution rather than forcing an arbitrary best path.

D:

This remediates local preference is not exported to other autonomous systems, normally indicated by External peers continue choosing the wrong ingress despite local preference changes. It would leave the observed problem (A route is not selected despite the upstream session remaining Established) unresolved. Address it with repair upstream next-hop resolution rather than forcing an arbitrary best path.

Question 346

A provider receives a default route over two external sessions. Observed: A route is not selected despite the upstream session remaining Established. What evidence would validate recovery from this precise failure mode?

  1. Upstream route selection changes as validated by external path observations.
  2. RIB contains only contracted routes and resource usage returns to safe levels.
  3. The preferred default has a valid resolved next hop and becomes active.
  4. The recovered prefix becomes usable after permitted penalty decay without excessive flapping.

Explanation

Correct Answer

C:

The intended result is The preferred default has a valid resolved next hop and becomes active. It specifically verifies recovery from the competing next hop fails recursive reachability validation, which produced the original symptom: A route is not selected despite the upstream session remaining Established. It is stronger evidence than a generic interface-up indicator.

Incorrect Answers

A:

This result is useful in another case with evidence External peers continue choosing the wrong ingress despite local preference changes. It does not test recovery from a route is not selected despite the upstream session remaining established. Check instead whether the preferred default has a valid resolved next hop and becomes active.

B:

That observation would verify a separate fault involving bgp inbound acceptance policy and max-prefix safety do not constrain the contracted feed. Its symptom is An unexpected memory spike occurs although only a few prefixes should be accepted. For this case the actual issue is the competing next hop fails recursive reachability validation, and the relevant success signal is The preferred default has a valid resolved next hop and becomes active.

D:

It confirms an unrelated service correction: Route flap damping penalty and reuse thresholds remain active. The present case reports A route is not selected despite the upstream session remaining Established. Its completion test is The preferred default has a valid resolved next hop and becomes active.

Question 347

A provider receives a default route over two external sessions. Observed: A route is not selected despite the upstream session remaining Established. What underlying protocol or service configuration problem best explains the evidence?

  1. Route flap damping penalty and reuse thresholds remain active.
  2. BGP inbound acceptance policy and max-prefix safety do not constrain the contracted feed.
  3. Local preference is not exported to other autonomous systems.
  4. The competing next hop fails recursive reachability validation.

Explanation

Correct Answer

D:

Because a route is not selected despite the upstream session remaining Established, the likely cause is the competing next hop fails recursive reachability validation. It is testable: Repair upstream next-hop resolution rather than forcing an arbitrary best path. Expected follow-up: The preferred default has a valid resolved next hop and becomes active.

Incorrect Answers

A:

Route flap damping penalty and reuse thresholds remain active. would normally be accompanied by a stable recovered prefix stays suppressed after several route updates. The observed symptom is different: A route is not selected despite the upstream session remaining Established. The likely cause is The competing next hop fails recursive reachability validation.

B:

The stated cause is possible elsewhere but explains an unexpected memory spike occurs although only a few prefixes should be accepted, not a route is not selected despite the upstream session remaining established. This incident is better attributed to the competing next hop fails recursive reachability validation.

C:

That explanation fits another condition: External peers continue choosing the wrong ingress despite local preference changes. The evidence here is A route is not selected despite the upstream session remaining Established. Its closer root cause is The competing next hop fails recursive reachability validation.

Question 348

A provider receives a default route over two external sessions. Observed: A route is not selected despite the upstream session remaining Established. Which ongoing validation gate would best detect a recurrence of this problem?

  1. For each approved related change, verify that rIB contains only contracted routes and resource usage returns to safe levels. Flag recurrence if an unexpected memory spike occurs although only a few prefixes should be accepted.
  2. For each approved related change, verify that the preferred default has a valid resolved next hop and becomes active. Flag recurrence if a route is not selected despite the upstream session remaining Established.
  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 upstream route selection changes as validated by external path observations. Flag recurrence if external peers continue choosing the wrong ingress despite local preference changes.

Explanation

Correct Answer

B:

A useful regression gate tests whether the preferred default has a valid resolved next hop and becomes active and alerts when a route is not selected despite the upstream session remaining Established. This directly checks the technical weakness: The competing next hop fails recursive reachability validation. 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 bgp inbound acceptance policy and max-prefix safety do not constrain the contracted feed, typically observed when an unexpected memory spike occurs although only a few prefixes should be accepted. Here the target is the competing next hop fails recursive reachability validation; monitor the preferred default has a valid resolved next hop and becomes active.

C:

This gate monitors a different failure, a stable recovered prefix stays suppressed after several route updates. It would not detect the current problem: A route is not selected despite the upstream session remaining Established. The appropriate check requires the preferred default has a valid resolved next hop and becomes active.

D:

It is valid for another service scenario but checks external peers continue choosing the wrong ingress despite local preference changes. This case instead needs a gate for a route is not selected despite the upstream session remaining established and evidence that the preferred default has a valid resolved next hop and becomes active.

Question 349

An external peer sends an entire Internet table to a small service PE. Observed: An unexpected memory spike occurs although only a few prefixes should be accepted. Which change most directly corrects the failure while respecting the existing service boundary?

  1. Coordinate carrier-supported communities or accepted inbound steering methods.
  2. Review originator ID and cluster-list propagation and repair the client topology.
  3. Apply a narrow import filter and prefix-limit according to the service agreement.
  4. Establish permitted FlowSpec family and validation rules before accepting actions.

Explanation

Correct Answer

C:

The observed condition is An unexpected memory spike occurs although only a few prefixes should be accepted. That indicates bgp inbound acceptance policy and max-prefix safety do not constrain the contracted feed. Applying the proposed remedy directly changes that condition. A concrete completion check is: RIB contains only contracted routes and resource usage returns to safe levels.

Incorrect Answers

A:

This change belongs to a different BGP issue: New prepended announcements do not influence the chosen inbound route. That issue involves upstream local preference overrides the longer as-path signal. The current symptom is An unexpected memory spike occurs although only a few prefixes should be accepted. It instead requires apply a narrow import filter and prefix-limit according to the service agreement.

B:

This remediates client and nonclient relationships were modified without controlling reflection loops, normally indicated by Path oscillation appears between two route reflectors after clients are rearranged. It would leave the observed problem (An unexpected memory spike occurs although only a few prefixes should be accepted) unresolved. Address it with apply a narrow import filter and prefix-limit according to the service agreement.

D:

The option may be useful when a FlowSpec announcement is present but the PE never applies the firewall action, but that is not the current evidence. Here, an unexpected memory spike occurs although only a few prefixes should be accepted, indicating bgp inbound acceptance policy and max-prefix safety do not constrain the contracted feed. The targeted action is Apply a narrow import filter and prefix-limit according to the service agreement.

Question 350

An external peer sends an entire Internet table to a small service PE. Observed: An unexpected memory spike occurs although only a few prefixes should be accepted. After the correction, which result would most convincingly show that this fault is resolved?

  1. Inbound traffic converges to the agreed primary while the backup remains available.
  2. Reflected route attributes remain loop-free and no repeated re-advertisement occurs.
  3. Only authorized mitigation components are programmed in the forwarding plane.
  4. RIB contains only contracted routes and resource usage returns to safe levels.

Explanation

Correct Answer

D:

After apply a narrow import filter and prefix-limit according to the service agreement, inspect whether rIB contains only contracted routes and resource usage returns to safe levels. This closes the loop between the reported observation (An unexpected memory spike occurs although only a few prefixes should be accepted) and the underlying issue (BGP inbound acceptance policy and max-prefix safety do not constrain the contracted feed).

Incorrect Answers

A:

It confirms an unrelated service correction: Upstream local preference overrides the longer AS-path signal. The present case reports An unexpected memory spike occurs although only a few prefixes should be accepted. Its completion test is RIB contains only contracted routes and resource usage returns to safe levels.

B:

This result is useful in another case with evidence Path oscillation appears between two route reflectors after clients are rearranged. It does not test recovery from an unexpected memory spike occurs although only a few prefixes should be accepted. Check instead whether rIB contains only contracted routes and resource usage returns to safe levels.

C:

That observation would verify a separate fault involving flowspec address-family negotiation or validation against unicast reachability fails. Its symptom is A FlowSpec announcement is present but the PE never applies the firewall action. For this case the actual issue is bgp inbound acceptance policy and max-prefix safety do not constrain the contracted feed, and the relevant success signal is RIB contains only contracted routes and resource usage returns to safe levels.

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