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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 36

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.

Question 351

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 root cause is most consistent with this symptom?

  1. Upstream local preference overrides the longer AS-path signal.
  2. BGP inbound acceptance policy and max-prefix safety do not constrain the contracted feed.
  3. FlowSpec address-family negotiation or validation against unicast reachability fails.
  4. Client and nonclient relationships were modified without controlling reflection loops.

Explanation

Correct Answer

B:

The reported evidence—An unexpected memory spike occurs although only a few prefixes should be accepted—supports bgp inbound acceptance policy and max-prefix safety do not constrain the contracted feed. The appropriate intervention is to apply a narrow import filter and prefix-limit according to the service agreement, with confirmation from rIB contains only contracted routes and resource usage returns to safe levels. Other causes require actual device-state verification.

Incorrect Answers

A:

Upstream local preference overrides the longer AS-path signal. would normally be accompanied by new prepended announcements do not influence the chosen inbound route. The observed symptom is different: An unexpected memory spike occurs although only a few prefixes should be accepted. The likely cause is BGP inbound acceptance policy and max-prefix safety do not constrain the contracted feed.

C:

The stated cause is possible elsewhere but explains a flowspec announcement is present but the pe never applies the firewall action, not an unexpected memory spike occurs although only a few prefixes should be accepted. This incident is better attributed to bgp inbound acceptance policy and max-prefix safety do not constrain the contracted feed.

D:

That explanation fits another condition: Path oscillation appears between two route reflectors after clients are rearranged. The evidence here is An unexpected memory spike occurs although only a few prefixes should be accepted. Its closer root cause is BGP inbound acceptance policy and max-prefix safety do not constrain the contracted feed.

Question 352

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-acceptance control is most relevant to preventing this exact failure?

  1. For each approved related change, verify that only authorized mitigation components are programmed in the forwarding plane. Flag recurrence if a FlowSpec announcement is present but the PE never applies the firewall action.
  2. For each approved related change, verify that reflected route attributes remain loop-free and no repeated re-advertisement occurs. Flag recurrence if path oscillation appears between two route reflectors after clients are rearranged.
  3. 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.
  4. 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.

Explanation

Correct Answer

D:

The control is specific to the initial failure. It requires the result RIB contains only contracted routes and resource usage returns to safe levels. and treats An unexpected memory spike occurs although only a few prefixes should be accepted. as a failure signal. The causal concern is bgp inbound acceptance policy and max-prefix safety do not constrain the contracted feed.

Incorrect Answers

A:

The proposed control is tied to flowspec address-family negotiation or validation against unicast reachability fails, typically observed when a FlowSpec announcement is present but the PE never applies the firewall action. Here the target is bgp inbound acceptance policy and max-prefix safety do not constrain the contracted feed; monitor rIB contains only contracted routes and resource usage returns to safe levels.

B:

It is valid for another service scenario but checks path oscillation appears between two route reflectors after clients are rearranged. This case instead needs a gate for an unexpected memory spike occurs although only a few prefixes should be accepted and evidence that rIB contains only contracted routes and resource usage returns to safe levels.

C:

This gate monitors a different failure, new prepended announcements do not influence the chosen inbound route. It would not detect the current problem: An unexpected memory spike occurs although only a few prefixes should be accepted. The appropriate check requires rIB contains only contracted routes and resource usage returns to safe levels.

Question 353

A backbone route reflector cluster is expanded during maintenance. Observed: Path oscillation appears between two route reflectors after clients are rearranged. What should the routing engineer change first to address this particular symptom?

  1. Confirm the applicable MED comparison rules and engineer a supported consistent policy.
  2. Review originator ID and cluster-list propagation and repair the client topology.
  3. Align route-policy characteristics and supported internal multipath behavior.
  4. Refine source/destination and protocol match components to the verified attack pattern.

Explanation

Correct Answer

B:

The decisive evidence is that Path oscillation appears between two route reflectors after clients are rearranged. This follows from client and nonclient relationships were modified without controlling reflection loops. The focused remedy is to review originator ID and cluster-list propagation and repair the client topology. Confirm improvement when reflected route attributes remain loop-free and no repeated re-advertisement occurs. Validate on an approved lab or change window before touching production.

Incorrect Answers

A:

The option may be useful when the team expects a lower MED to win across different neighboring AS paths, but that is not the current evidence. Here, path oscillation appears between two route reflectors after clients are rearranged, indicating client and nonclient relationships were modified without controlling reflection loops. The targeted action is Review originator ID and cluster-list propagation and repair the client topology.

C:

This change belongs to a different BGP issue: Equal NLRI from different originators causes inconsistent distribution. That issue involves required bgp multipath attributes are not sufficiently equivalent for multipath. The current symptom is Path oscillation appears between two route reflectors after clients are rearranged. It instead requires review originator ID and cluster-list propagation and repair the client topology.

D:

This remediates flowspec match components are less specific than the approved attack signature, normally indicated by Normal customer traffic is dropped because the match covers the entire tenant aggregate. It would leave the observed problem (Path oscillation appears between two route reflectors after clients are rearranged) unresolved. Address it with review originator ID and cluster-list propagation and repair the client topology.

Question 354

A backbone route reflector cluster is expanded during maintenance. Observed: Path oscillation appears between two route reflectors after clients are rearranged. Which acceptance observation best confirms that the proposed change worked?

  1. The attack is filtered while unaffected flows remain reachable.
  2. Reflected route attributes remain loop-free and no repeated re-advertisement occurs.
  3. Both permitted paths become active only when their attributes qualify.
  4. Route preference follows the documented comparison without unpredictable cross-AS assumptions.

Explanation

Correct Answer

B:

This acceptance criterion tests the actual fault. The source evidence was Path oscillation appears between two route reflectors after clients are rearranged. The correction addresses client and nonclient relationships were modified without controlling reflection loops; success requires reflected route attributes remain loop-free and no repeated re-advertisement occurs.

Incorrect Answers

A:

This result is useful in another case with evidence Normal customer traffic is dropped because the match covers the entire tenant aggregate. It does not test recovery from path oscillation appears between two route reflectors after clients are rearranged. Check instead whether reflected route attributes remain loop-free and no repeated re-advertisement occurs.

C:

It confirms an unrelated service correction: Required BGP multipath attributes are not sufficiently equivalent for multipath. The present case reports Path oscillation appears between two route reflectors after clients are rearranged. Its completion test is Reflected route attributes remain loop-free and no repeated re-advertisement occurs.

D:

That observation would verify a separate fault involving med comparison behavior depends on neighboring as and configured policies. Its symptom is The team expects a lower MED to win across different neighboring AS paths. For this case the actual issue is client and nonclient relationships were modified without controlling reflection loops, and the relevant success signal is Reflected route attributes remain loop-free and no repeated re-advertisement occurs.

Question 355

A backbone route reflector cluster is expanded during maintenance. Observed: Path oscillation appears between two route reflectors after clients are rearranged. What is the most likely source of the observed routing or service failure?

  1. Client and nonclient relationships were modified without controlling reflection loops.
  2. Required BGP multipath attributes are not sufficiently equivalent for multipath.
  3. MED comparison behavior depends on neighboring AS and configured policies.
  4. FlowSpec match components are less specific than the approved attack signature.

Explanation

Correct Answer

A:

This explanation is the closest match to the observed symptom: Path oscillation appears between two route reflectors after clients are rearranged. The specified root issue is Client and nonclient relationships were modified without controlling reflection loops. Repair it through review originator ID and cluster-list propagation and repair the client topology, then check reflected route attributes remain loop-free and no repeated re-advertisement occurs.

Incorrect Answers

B:

Required BGP multipath attributes are not sufficiently equivalent for multipath. would normally be accompanied by equal nlri from different originators causes inconsistent distribution. The observed symptom is different: Path oscillation appears between two route reflectors after clients are rearranged. The likely cause is Client and nonclient relationships were modified without controlling reflection loops.

C:

The stated cause is possible elsewhere but explains the team expects a lower med to win across different neighboring as paths, not path oscillation appears between two route reflectors after clients are rearranged. This incident is better attributed to client and nonclient relationships were modified without controlling reflection loops.

D:

That explanation fits another condition: Normal customer traffic is dropped because the match covers the entire tenant aggregate. The evidence here is Path oscillation appears between two route reflectors after clients are rearranged. Its closer root cause is Client and nonclient relationships were modified without controlling reflection loops.

Question 356

A backbone route reflector cluster is expanded during maintenance. Observed: Path oscillation appears between two route reflectors after clients are rearranged. What operational check best guards against this problem returning?

  1. For each approved related change, verify that the attack is filtered while unaffected flows remain reachable. Flag recurrence if normal customer traffic is dropped because the match covers the entire tenant aggregate.
  2. For each approved related change, verify that reflected route attributes remain loop-free and no repeated re-advertisement occurs. Flag recurrence if path oscillation appears between two route reflectors after clients are rearranged.
  3. For each approved related change, verify that both permitted paths become active only when their attributes qualify. Flag recurrence if equal NLRI from different originators causes inconsistent distribution.
  4. For each approved related change, verify that route preference follows the documented comparison without unpredictable cross-AS assumptions. Flag recurrence if the team expects a lower MED to win across different neighboring AS paths.

Explanation

Correct Answer

B:

This control asks for the same recovery evidence (Reflected route attributes remain loop-free and no repeated re-advertisement occurs) and flags recurrence of the same failure (Path oscillation appears between two route reflectors after clients are rearranged). It targets the underlying issue, client and nonclient relationships were modified without controlling reflection loops, rather than a different service problem. The exact cadence must be agreed with operations.

Incorrect Answers

A:

It is valid for another service scenario but checks normal customer traffic is dropped because the match covers the entire tenant aggregate. This case instead needs a gate for path oscillation appears between two route reflectors after clients are rearranged and evidence that reflected route attributes remain loop-free and no repeated re-advertisement occurs.

C:

This gate monitors a different failure, equal nlri from different originators causes inconsistent distribution. It would not detect the current problem: Path oscillation appears between two route reflectors after clients are rearranged. The appropriate check requires reflected route attributes remain loop-free and no repeated re-advertisement occurs.

D:

The proposed control is tied to med comparison behavior depends on neighboring as and configured policies, typically observed when the team expects a lower MED to win across different neighboring AS paths. Here the target is client and nonclient relationships were modified without controlling reflection loops; monitor reflected route attributes remain loop-free and no repeated re-advertisement occurs.

Question 357

A provider installs ECMP over two internal iBGP peers. Observed: Equal NLRI from different originators causes inconsistent distribution. Which targeted remediation is most appropriate for the observed condition?

  1. Restrict the MED mutation term to the agreed prefixes and peer communities.
  2. Use the contracted community value and enable the permitted community propagation.
  3. Align route-policy characteristics and supported internal multipath behavior.
  4. Match local source address and remote neighbor definition with multihop permissions.

Explanation

Correct Answer

C:

This fix addresses the stated cause rather than an unrelated protocol. The reported symptom—Equal NLRI from different originators causes inconsistent distribution—is consistent with required bgp multipath attributes are not sufficiently equivalent for multipath. Use the specified correction, then verify: Both permitted paths become active only when their attributes qualify. Preserve existing policy and tenant isolation.

Incorrect Answers

A:

The option may be useful when policy unexpectedly modifies MED for every customer route, but that is not the current evidence. Here, equal NLRI from different originators causes inconsistent distribution, indicating required bgp multipath attributes are not sufficiently equivalent for multipath. The targeted action is Align route-policy characteristics and supported internal multipath behavior.

B:

This remediates the carrier expects a different community value or route export suppresses communities, normally indicated by The upstream does not apply the agreed blackhole policy. It would leave the observed problem (Equal NLRI from different originators causes inconsistent distribution) unresolved. Address it with align route-policy characteristics and supported internal multipath behavior.

D:

This change belongs to a different BGP issue: One router silently sources TCP from a physical interface instead of its loopback. That issue involves update-source and reachability design disagree across the peers. The current symptom is Equal NLRI from different originators causes inconsistent distribution. It instead requires align route-policy characteristics and supported internal multipath behavior.

Question 358

A provider installs ECMP over two internal iBGP peers. Observed: Equal NLRI from different originators causes inconsistent distribution. What evidence would validate recovery from this precise failure mode?

  1. Both permitted paths become active only when their attributes qualify.
  2. MED differs only on targeted routes and unrelated announcements remain unchanged.
  3. The session's TCP endpoint addresses match the planned loopback addresses.
  4. The upstream confirms the intended tagged route receives the agreed action.

Explanation

Correct Answer

A:

The intended result is Both permitted paths become active only when their attributes qualify. It specifically verifies recovery from required bgp multipath attributes are not sufficiently equivalent for multipath, which produced the original symptom: Equal NLRI from different originators causes inconsistent distribution. It is stronger evidence than a generic interface-up indicator.

Incorrect Answers

B:

That observation would verify a separate fault involving a broad routing-policy term matches routes outside its intended customer prefix list. Its symptom is Policy unexpectedly modifies MED for every customer route. For this case the actual issue is required bgp multipath attributes are not sufficiently equivalent for multipath, and the relevant success signal is Both permitted paths become active only when their attributes qualify.

C:

It confirms an unrelated service correction: Update-source and reachability design disagree across the peers. The present case reports Equal NLRI from different originators causes inconsistent distribution. Its completion test is Both permitted paths become active only when their attributes qualify.

D:

This result is useful in another case with evidence The upstream does not apply the agreed blackhole policy. It does not test recovery from equal nlri from different originators causes inconsistent distribution. Check instead whether both permitted paths become active only when their attributes qualify.

Question 359

A provider installs ECMP over two internal iBGP peers. Observed: Equal NLRI from different originators causes inconsistent distribution. What underlying protocol or service configuration problem best explains the evidence?

  1. Required BGP multipath attributes are not sufficiently equivalent for multipath.
  2. The carrier expects a different community value or route export suppresses communities.
  3. Update-source and reachability design disagree across the peers.
  4. A broad routing-policy term matches routes outside its intended customer prefix list.

Explanation

Correct Answer

A:

Because equal NLRI from different originators causes inconsistent distribution, the likely cause is required bgp multipath attributes are not sufficiently equivalent for multipath. It is testable: Align route-policy characteristics and supported internal multipath behavior. Expected follow-up: Both permitted paths become active only when their attributes qualify.

Incorrect Answers

B:

That explanation fits another condition: The upstream does not apply the agreed blackhole policy. The evidence here is Equal NLRI from different originators causes inconsistent distribution. Its closer root cause is Required BGP multipath attributes are not sufficiently equivalent for multipath.

C:

Update-source and reachability design disagree across the peers. would normally be accompanied by one router silently sources tcp from a physical interface instead of its loopback. The observed symptom is different: Equal NLRI from different originators causes inconsistent distribution. The likely cause is Required BGP multipath attributes are not sufficiently equivalent for multipath.

D:

The stated cause is possible elsewhere but explains policy unexpectedly modifies med for every customer route, not equal nlri from different originators causes inconsistent distribution. This incident is better attributed to required bgp multipath attributes are not sufficiently equivalent for multipath.

Question 360

A provider installs ECMP over two internal iBGP peers. Observed: Equal NLRI from different originators causes inconsistent distribution. Which ongoing validation gate would best detect a recurrence of this problem?

  1. For each approved related change, verify that the session's TCP endpoint addresses match the planned loopback addresses. Flag recurrence if one router silently sources TCP from a physical interface instead of its loopback.
  2. For each approved related change, verify that mED differs only on targeted routes and unrelated announcements remain unchanged. Flag recurrence if policy unexpectedly modifies MED for every customer route.
  3. For each approved related change, verify that the upstream confirms the intended tagged route receives the agreed action. Flag recurrence if the upstream does not apply the agreed blackhole policy.
  4. For each approved related change, verify that both permitted paths become active only when their attributes qualify. Flag recurrence if equal NLRI from different originators causes inconsistent distribution.

Explanation

Correct Answer

D:

A useful regression gate tests whether both permitted paths become active only when their attributes qualify and alerts when equal NLRI from different originators causes inconsistent distribution. This directly checks the technical weakness: Required BGP multipath attributes are not sufficiently equivalent for multipath. The gate is derived from the fictional incident and is not an independent Juniper engineer signoff.

Incorrect Answers

A:

This gate monitors a different failure, one router silently sources tcp from a physical interface instead of its loopback. It would not detect the current problem: Equal NLRI from different originators causes inconsistent distribution. The appropriate check requires both permitted paths become active only when their attributes qualify.

B:

The proposed control is tied to a broad routing-policy term matches routes outside its intended customer prefix list, typically observed when policy unexpectedly modifies MED for every customer route. Here the target is required bgp multipath attributes are not sufficiently equivalent for multipath; monitor both permitted paths become active only when their attributes qualify.

C:

It is valid for another service scenario but checks the upstream does not apply the agreed blackhole policy. This case instead needs a gate for equal nlri from different originators causes inconsistent distribution and evidence that both permitted paths become active only when their attributes qualify.

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