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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 31

Question 300

A tenant controller sends a FlowSpec discard rule for a broad prefix. Observed: Normal customer traffic is dropped because the match covers the entire tenant aggregate. Which ongoing validation gate would best detect a recurrence of this problem?

  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 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.
  3. 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.
  4. 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.

Explanation

Correct Answer

A:

A useful regression gate tests whether the attack is filtered while unaffected flows remain reachable and alerts when normal customer traffic is dropped because the match covers the entire tenant aggregate. This directly checks the technical weakness: FlowSpec match components are less specific than the approved attack signature. The gate is derived from the fictional incident and is not an independent Juniper engineer signoff.

Incorrect Answers

B:

The proposed control is tied to update-source and reachability design disagree across the peers, typically observed when one router silently sources TCP from a physical interface instead of its loopback. Here the target is flowspec match components are less specific than the approved attack signature; monitor the attack is filtered while unaffected flows remain reachable.

C:

It is valid for another service scenario but checks an unexpected memory spike occurs although only a few prefixes should be accepted. This case instead needs a gate for normal customer traffic is dropped because the match covers the entire tenant aggregate and evidence that the attack is filtered while unaffected flows remain reachable.

D:

This gate monitors a different failure, new prepended announcements do not influence the chosen inbound route. It would not detect the current problem: Normal customer traffic is dropped because the match covers the entire tenant aggregate. The appropriate check requires the attack is filtered while unaffected flows remain reachable.

Question 301

A BGP border router starts using eBGP multihop over loopbacks. Observed: One router silently sources TCP from a physical interface instead of its loopback. Which change most directly corrects the failure while respecting the existing service boundary?

  1. Match local source address and remote neighbor definition with multihop permissions.
  2. Review originator ID and cluster-list propagation and repair the client topology.
  3. Confirm the applicable MED comparison rules and engineer a supported consistent policy.
  4. Evaluate Junos BGP attributes and policy ordering rather than importing another vendor's model.

Explanation

Correct Answer

A:

The observed condition is One router silently sources TCP from a physical interface instead of its loopback. That indicates update-source and reachability design disagree across the peers. Applying the proposed remedy directly changes that condition. A concrete completion check is: The session's TCP endpoint addresses match the planned loopback addresses.

Incorrect Answers

B:

This change belongs to a different BGP issue: Path oscillation appears between two route reflectors after clients are rearranged. That issue involves client and nonclient relationships were modified without controlling reflection loops. The current symptom is One router silently sources TCP from a physical interface instead of its loopback. It instead requires match local source address and remote neighbor definition with multihop permissions.

C:

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, one router silently sources TCP from a physical interface instead of its loopback, indicating update-source and reachability design disagree across the peers. The targeted action is Match local source address and remote neighbor definition with multihop permissions.

D:

This remediates vendor-specific nonportable bgp weight behavior was conflated with junos route preference, normally indicated by An operator assumes weight should decide the path on a Junos router. It would leave the observed problem (One router silently sources TCP from a physical interface instead of its loopback) unresolved. Address it with match local source address and remote neighbor definition with multihop permissions.

Question 302

A BGP border router starts using eBGP multihop over loopbacks. Observed: One router silently sources TCP from a physical interface instead of its loopback. After the correction, which result would most convincingly show that this fault is resolved?

  1. Reflected route attributes remain loop-free and no repeated re-advertisement occurs.
  2. The selected best path matches valid Junos preference and BGP decision rules.
  3. The session's TCP endpoint addresses match the planned loopback addresses.
  4. Route preference follows the documented comparison without unpredictable cross-AS assumptions.

Explanation

Correct Answer

C:

After match local source address and remote neighbor definition with multihop permissions, inspect whether the session's TCP endpoint addresses match the planned loopback addresses. This closes the loop between the reported observation (One router silently sources TCP from a physical interface instead of its loopback) and the underlying issue (Update-source and reachability design disagree across the peers).

Incorrect Answers

A:

It confirms an unrelated service correction: Client and nonclient relationships were modified without controlling reflection loops. The present case reports One router silently sources TCP from a physical interface instead of its loopback. Its completion test is The session's TCP endpoint addresses match the planned loopback addresses.

B:

This result is useful in another case with evidence An operator assumes weight should decide the path on a Junos router. It does not test recovery from one router silently sources tcp from a physical interface instead of its loopback. Check instead whether the session's TCP endpoint addresses match the planned loopback addresses.

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 update-source and reachability design disagree across the peers, and the relevant success signal is The session's TCP endpoint addresses match the planned loopback addresses.

Question 303

A BGP border router starts using eBGP multihop over loopbacks. Observed: One router silently sources TCP from a physical interface instead of its loopback. Which root cause is most consistent with this symptom?

  1. Update-source and reachability design disagree across the peers.
  2. Vendor-specific nonportable BGP weight behavior was conflated with Junos route preference.
  3. Client and nonclient relationships were modified without controlling reflection loops.
  4. MED comparison behavior depends on neighboring AS and configured policies.

Explanation

Correct Answer

A:

The reported evidence—One router silently sources TCP from a physical interface instead of its loopback—supports update-source and reachability design disagree across the peers. The appropriate intervention is to match local source address and remote neighbor definition with multihop permissions, with confirmation from the session's TCP endpoint addresses match the planned loopback addresses. Other causes require actual device-state verification.

Incorrect Answers

B:

That explanation fits another condition: An operator assumes weight should decide the path on a Junos router. The evidence here is One router silently sources TCP from a physical interface instead of its loopback. Its closer root cause is Update-source and reachability design disagree across the peers.

C:

Client and nonclient relationships were modified without controlling reflection loops. would normally be accompanied by path oscillation appears between two route reflectors after clients are rearranged. The observed symptom is different: One router silently sources TCP from a physical interface instead of its loopback. The likely cause is Update-source and reachability design disagree across the peers.

D:

The stated cause is possible elsewhere but explains the team expects a lower med to win across different neighboring as paths, not one router silently sources tcp from a physical interface instead of its loopback. This incident is better attributed to update-source and reachability design disagree across the peers.

Question 304

A BGP border router starts using eBGP multihop over loopbacks. Observed: One router silently sources TCP from a physical interface instead of its loopback. Which change-acceptance control is most relevant to preventing this exact failure?

  1. 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.
  2. 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.
  3. For each approved related change, verify that the selected best path matches valid Junos preference and BGP decision rules. Flag recurrence if an operator assumes weight should decide the path on a Junos router.
  4. 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.

Explanation

Correct Answer

B:

The control is specific to the initial failure. It requires the result The session's TCP endpoint addresses match the planned loopback addresses. and treats One router silently sources TCP from a physical interface instead of its loopback. as a failure signal. The causal concern is update-source and reachability design disagree across the peers.

Incorrect Answers

A:

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 update-source and reachability design disagree across the peers; monitor the session's TCP endpoint addresses match the planned loopback addresses.

C:

It is valid for another service scenario but checks an operator assumes weight should decide the path on a junos router. This case instead needs a gate for one router silently sources tcp from a physical interface instead of its loopback and evidence that the session's TCP endpoint addresses match the planned loopback addresses.

D:

This gate monitors a different failure, path oscillation appears between two route reflectors after clients are rearranged. It would not detect the current problem: One router silently sources TCP from a physical interface instead of its loopback. The appropriate check requires the session's TCP endpoint addresses match the planned loopback addresses.

Question 305

Two eBGP routes for a customer prefix have the same local preference. Observed: An operator assumes weight should decide the path on a Junos router. What should the routing engineer change first to address this particular symptom?

  1. Evaluate Junos BGP attributes and policy ordering rather than importing another vendor's model.
  2. Use the contracted community value and enable the permitted community propagation.
  3. Remove the accidental AS-path loop or redesign the session without broad allow-as loops.
  4. Align route-policy characteristics and supported internal multipath behavior.

Explanation

Correct Answer

A:

The decisive evidence is that An operator assumes weight should decide the path on a Junos router. This follows from vendor-specific nonportable bgp weight behavior was conflated with junos route preference. The focused remedy is to evaluate Junos BGP attributes and policy ordering rather than importing another vendor's model. Confirm improvement when the selected best path matches valid Junos preference and BGP decision rules. Validate on an approved lab or change window before touching production.

Incorrect Answers

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 (An operator assumes weight should decide the path on a Junos router) unresolved. Address it with evaluate Junos BGP attributes and policy ordering rather than importing another vendor's model.

C:

This change belongs to a different BGP issue: The next router drops it because its own AS is present in the path. That issue involves as-loop prevention correctly rejects a path containing the local autonomous system. The current symptom is An operator assumes weight should decide the path on a Junos router. It instead requires evaluate Junos BGP attributes and policy ordering rather than importing another vendor's model.

D:

The option may be useful when equal NLRI from different originators causes inconsistent distribution, but that is not the current evidence. Here, an operator assumes weight should decide the path on a Junos router, indicating vendor-specific nonportable bgp weight behavior was conflated with junos route preference. The targeted action is Evaluate Junos BGP attributes and policy ordering rather than importing another vendor's model.

Question 306

Two eBGP routes for a customer prefix have the same local preference. Observed: An operator assumes weight should decide the path on a Junos router. Which acceptance observation best confirms that the proposed change worked?

  1. An authorized loop-free path is accepted and no repeated AS numbers cause rejection.
  2. Both permitted paths become active only when their attributes qualify.
  3. The selected best path matches valid Junos preference and BGP decision rules.
  4. The upstream confirms the intended tagged route receives the agreed action.

Explanation

Correct Answer

C:

This acceptance criterion tests the actual fault. The source evidence was An operator assumes weight should decide the path on a Junos router. The correction addresses vendor-specific nonportable bgp weight behavior was conflated with junos route preference; success requires the selected best path matches valid Junos preference and BGP decision rules.

Incorrect Answers

A:

It confirms an unrelated service correction: AS-loop prevention correctly rejects a path containing the local autonomous system. The present case reports An operator assumes weight should decide the path on a Junos router. Its completion test is The selected best path matches valid Junos preference and BGP decision rules.

B:

That observation would verify a separate fault involving required bgp multipath attributes are not sufficiently equivalent for multipath. Its symptom is Equal NLRI from different originators causes inconsistent distribution. For this case the actual issue is vendor-specific nonportable bgp weight behavior was conflated with junos route preference, and the relevant success signal is The selected best path matches valid Junos preference and BGP decision rules.

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 an operator assumes weight should decide the path on a junos router. Check instead whether the selected best path matches valid Junos preference and BGP decision rules.

Question 307

Two eBGP routes for a customer prefix have the same local preference. Observed: An operator assumes weight should decide the path on a Junos router. What is the most likely source of the observed routing or service failure?

  1. AS-loop prevention correctly rejects a path containing the local autonomous system.
  2. Vendor-specific nonportable BGP weight behavior was conflated with Junos route preference.
  3. The carrier expects a different community value or route export suppresses communities.
  4. Required BGP multipath attributes are not sufficiently equivalent for multipath.

Explanation

Correct Answer

B:

This explanation is the closest match to the observed symptom: An operator assumes weight should decide the path on a Junos router. The specified root issue is Vendor-specific nonportable BGP weight behavior was conflated with Junos route preference. Repair it through evaluate Junos BGP attributes and policy ordering rather than importing another vendor's model, then check the selected best path matches valid Junos preference and BGP decision rules.

Incorrect Answers

A:

AS-loop prevention correctly rejects a path containing the local autonomous system. would normally be accompanied by the next router drops it because its own as is present in the path. The observed symptom is different: An operator assumes weight should decide the path on a Junos router. The likely cause is Vendor-specific nonportable BGP weight behavior was conflated with Junos route preference.

C:

That explanation fits another condition: The upstream does not apply the agreed blackhole policy. The evidence here is An operator assumes weight should decide the path on a Junos router. Its closer root cause is Vendor-specific nonportable BGP weight behavior was conflated with Junos route preference.

D:

The stated cause is possible elsewhere but explains equal nlri from different originators causes inconsistent distribution, not an operator assumes weight should decide the path on a junos router. This incident is better attributed to vendor-specific nonportable bgp weight behavior was conflated with junos route preference.

Question 308

Two eBGP routes for a customer prefix have the same local preference. Observed: An operator assumes weight should decide the path on a Junos router. What operational check best guards against this problem returning?

  1. 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.
  2. For each approved related change, verify that the selected best path matches valid Junos preference and BGP decision rules. Flag recurrence if an operator assumes weight should decide the path on a Junos router.
  3. For each approved related change, verify that an authorized loop-free path is accepted and no repeated AS numbers cause rejection. Flag recurrence if the next router drops it because its own AS is present in the path.
  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

B:

This control asks for the same recovery evidence (The selected best path matches valid Junos preference and BGP decision rules) and flags recurrence of the same failure (An operator assumes weight should decide the path on a Junos router). It targets the underlying issue, vendor-specific nonportable bgp weight behavior was conflated with junos route preference, 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 the upstream does not apply the agreed blackhole policy. This case instead needs a gate for an operator assumes weight should decide the path on a junos router and evidence that the selected best path matches valid Junos preference and BGP decision rules.

C:

This gate monitors a different failure, the next router drops it because its own as is present in the path. It would not detect the current problem: An operator assumes weight should decide the path on a Junos router. The appropriate check requires the selected best path matches valid Junos preference and BGP decision rules.

D:

The proposed control is tied to required bgp multipath attributes are not sufficiently equivalent for multipath, typically observed when equal NLRI from different originators causes inconsistent distribution. Here the target is vendor-specific nonportable bgp weight behavior was conflated with junos route preference; monitor the selected best path matches valid Junos preference and BGP decision rules.

Question 309

A BGP router has imported a route with an unexpected AS path. Observed: The next router drops it because its own AS is present in the path. Which targeted remediation is most appropriate for the observed condition?

  1. Use supported large-community attributes and matching import/export policy.
  2. Remove the accidental AS-path loop or redesign the session without broad allow-as loops.
  3. Restrict the MED mutation term to the agreed prefixes and peer communities.
  4. Explicitly permit only authorized customer announcements and reject internal infrastructure routes.

Explanation

Correct Answer

B:

This fix addresses the stated cause rather than an unrelated protocol. The reported symptom—The next router drops it because its own AS is present in the path—is consistent with as-loop prevention correctly rejects a path containing the local autonomous system. Use the specified correction, then verify: An authorized loop-free path is accepted and no repeated AS numbers cause rejection. Preserve existing policy and tenant isolation.

Incorrect Answers

A:

This change belongs to a different BGP issue: A 32-bit community representation cannot encode the required triple of values. That issue involves standard communities do not provide the three-field large-community semantics. The current symptom is The next router drops it because its own AS is present in the path. It instead requires remove the accidental AS-path loop or redesign the session without broad allow-as loops.

C:

This remediates a broad routing-policy term matches routes outside its intended customer prefix list, normally indicated by Policy unexpectedly modifies MED for every customer route. It would leave the observed problem (The next router drops it because its own AS is present in the path) unresolved. Address it with remove the accidental AS-path loop or redesign the session without broad allow-as loops.

D:

The option may be useful when the transit edge begins advertising an infrastructure loopback to an external customer, but that is not the current evidence. Here, the next router drops it because its own AS is present in the path, indicating as-loop prevention correctly rejects a path containing the local autonomous system. The targeted action is Remove the accidental AS-path loop or redesign the session without broad allow-as loops.

Question 310

A BGP router has imported a route with an unexpected AS path. Observed: The next router drops it because its own AS is present in the path. What evidence would validate recovery from this precise failure mode?

  1. MED differs only on targeted routes and unrelated announcements remain unchanged.
  2. Remote customer sees its contracted prefixes without provider loopbacks.
  3. The receiver sees the complete three-part community and classifies it correctly.
  4. An authorized loop-free path is accepted and no repeated AS numbers cause rejection.

Explanation

Correct Answer

D:

The intended result is An authorized loop-free path is accepted and no repeated AS numbers cause rejection. It specifically verifies recovery from as-loop prevention correctly rejects a path containing the local autonomous system, which produced the original symptom: The next router drops it because its own AS is present in the path. It is stronger evidence than a generic interface-up indicator.

Incorrect Answers

A:

This result is useful in another case with evidence Policy unexpectedly modifies MED for every customer route. It does not test recovery from the next router drops it because its own as is present in the path. Check instead whether an authorized loop-free path is accepted and no repeated AS numbers cause rejection.

B:

That observation would verify a separate fault involving bgp export policy is too broad for the neighbor's contractual prefix set. Its symptom is The transit edge begins advertising an infrastructure loopback to an external customer. For this case the actual issue is as-loop prevention correctly rejects a path containing the local autonomous system, and the relevant success signal is An authorized loop-free path is accepted and no repeated AS numbers cause rejection.

C:

It confirms an unrelated service correction: Standard communities do not provide the three-field large-community semantics. The present case reports The next router drops it because its own AS is present in the path. Its completion test is An authorized loop-free path is accepted and no repeated AS numbers cause rejection.

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