McAfee-Secured Website

Exam Code: JN0-664

Exam Name: Service Provider Routing and Switching, Professional (JNCIP-SP)

Certification Provider: Juniper

Corresponding Certification: JNCIP-SP

100% Juniper JN0-664 Guaranteed Success With Testking Training Materials

Get Real JN0-664 Exam Questions & Expert Verified Answers as Experienced on the Real Exam!

96 Questions & Answers with Testing Engine

"Service Provider Routing and Switching, Professional (JNCIP-SP) Exam", also known as JN0-664 exam, is a Juniper certification exam.

Pass your tests with the always up-to-date JN0-664 Exam Engine. Your JN0-664 training materials keep you at the head of the pack!

Satisfaction Guaranteed

Money Back Guarantee

Testking provides hassle-free money back guarantee with our products. That is because we have 100% trust in the abilities of our professional and experience product team, and our record is a proof of that.

99.6% PASS RATE
Was: $137.49
Now: $124.99

Juniper JN0-664 Practice Test 52

Question 510

An IGMP service uses the wrong version on an access-router interface. Observed: IGMPv3 receivers cannot express source include lists to the router. Which acceptance observation best confirms that the proposed change worked?

  1. Failover retains multicast delivery without stale RP dependency.
  2. The interface records expected source-specific membership state.
  3. Joins reach the RP and sustained packet flow is observed.
  4. (S,G) forwarding follows the expected shortest-path tree after switchover.

Explanation

Correct Answer

B:

This acceptance criterion tests the actual fault. The source evidence was IGMPv3 receivers cannot express source include lists to the router. The correction addresses local igmp version is fixed at an earlier membership model; success requires the interface records expected source-specific membership state.

Incorrect Answers

A:

This result is useful in another case with evidence One RP fails but receivers stay joined to a dead shared tree. It does not test recovery from igmpv3 receivers cannot express source include lists to the router. Check instead whether the interface records expected source-specific membership state.

C:

It confirms an unrelated service correction: RP address unicast reachability is unstable through recursive routes. The present case reports IGMPv3 receivers cannot express source include lists to the router. Its completion test is The interface records expected source-specific membership state.

D:

That observation would verify a separate fault involving spt threshold or pim source-tree behavior is not aligned to the service policy. Its symptom is Shared-tree traffic continues after the receiver requests shortest-path switchover. For this case the actual issue is local igmp version is fixed at an earlier membership model, and the relevant success signal is The interface records expected source-specific membership state.

Question 511

An IGMP service uses the wrong version on an access-router interface. Observed: IGMPv3 receivers cannot express source include lists to the router. What is the most likely source of the observed routing or service failure?

  1. RP address unicast reachability is unstable through recursive routes.
  2. SPT threshold or PIM source-tree behavior is not aligned to the service policy.
  3. RP redundancy and discovery were not implemented for the ASM service.
  4. Local IGMP version is fixed at an earlier membership model.

Explanation

Correct Answer

D:

This explanation is the closest match to the observed symptom: IGMPv3 receivers cannot express source include lists to the router. The specified root issue is Local IGMP version is fixed at an earlier membership model. Repair it through set compatible IGMPv3 processing and verify source filters, then check the interface records expected source-specific membership state.

Incorrect Answers

A:

RP address unicast reachability is unstable through recursive routes. would normally be accompanied by pim join packets repeatedly time out as the rp next hop changes. The observed symptom is different: IGMPv3 receivers cannot express source include lists to the router. The likely cause is Local IGMP version is fixed at an earlier membership model.

B:

The stated cause is possible elsewhere but explains shared-tree traffic continues after the receiver requests shortest-path switchover, not igmpv3 receivers cannot express source include lists to the router. This incident is better attributed to local igmp version is fixed at an earlier membership model.

C:

That explanation fits another condition: One RP fails but receivers stay joined to a dead shared tree. The evidence here is IGMPv3 receivers cannot express source include lists to the router. Its closer root cause is Local IGMP version is fixed at an earlier membership model.

Question 512

An IGMP service uses the wrong version on an access-router interface. Observed: IGMPv3 receivers cannot express source include lists to the router. What operational check best guards against this problem returning?

  1. For each approved related change, verify that (S,G) forwarding follows the expected shortest-path tree after switchover. Flag recurrence if shared-tree traffic continues after the receiver requests shortest-path switchover.
  2. For each approved related change, verify that joins reach the RP and sustained packet flow is observed. Flag recurrence if pIM Join packets repeatedly time out as the RP next hop changes.
  3. For each approved related change, verify that failover retains multicast delivery without stale RP dependency. Flag recurrence if one RP fails but receivers stay joined to a dead shared tree.
  4. For each approved related change, verify that the interface records expected source-specific membership state. Flag recurrence if iGMPv3 receivers cannot express source include lists to the router.

Explanation

Correct Answer

D:

This control asks for the same recovery evidence (The interface records expected source-specific membership state) and flags recurrence of the same failure (IGMPv3 receivers cannot express source include lists to the router). It targets the underlying issue, local igmp version is fixed at an earlier membership model, rather than a different service problem. The exact cadence must be agreed with operations.

Incorrect Answers

A:

The proposed control is tied to spt threshold or pim source-tree behavior is not aligned to the service policy, typically observed when shared-tree traffic continues after the receiver requests shortest-path switchover. Here the target is local igmp version is fixed at an earlier membership model; monitor the interface records expected source-specific membership state.

B:

This gate monitors a different failure, pim join packets repeatedly time out as the rp next hop changes. It would not detect the current problem: IGMPv3 receivers cannot express source include lists to the router. The appropriate check requires the interface records expected source-specific membership state.

C:

It is valid for another service scenario but checks one rp fails but receivers stay joined to a dead shared tree. This case instead needs a gate for igmpv3 receivers cannot express source include lists to the router and evidence that the interface records expected source-specific membership state.

Question 513

A provider RP is reachable through BGP but not directly via IGP. Observed: PIM Join packets repeatedly time out as the RP next hop changes. Which targeted remediation is most appropriate for the observed condition?

  1. Restore consistent routed reachability to the RP and PIM transit adjacencies.
  2. Trace upstream Join messages and restore PIM neighbor and multicast routing state.
  3. Increase source TTL to the minimal approved value and confirm routed path.
  4. Verify receiver membership and join state before changing forwarding policy.

Explanation

Correct Answer

A:

This fix addresses the stated cause rather than an unrelated protocol. The reported symptom—PIM Join packets repeatedly time out as the RP next hop changes—is consistent with rp address unicast reachability is unstable through recursive routes. Use the specified correction, then verify: Joins reach the RP and sustained packet flow is observed. Preserve existing policy and tenant isolation.

Incorrect Answers

B:

This change belongs to a different IP Multicast issue: Edge receivers are active but the intermediate router has no outgoing interface list. That issue involves the group join state does not propagate through the intended pim path. The current symptom is PIM Join packets repeatedly time out as the RP next hop changes. It instead requires restore consistent routed reachability to the RP and PIM transit adjacencies.

C:

This remediates source multicast ttl is too small to traverse the intended router depth, normally indicated by Subscribers several hops away receive no video although nearby receivers work. It would leave the observed problem (PIM Join packets repeatedly time out as the RP next hop changes) unresolved. Address it with restore consistent routed reachability to the RP and PIM transit adjacencies.

D:

The option may be useful when operators report no outgoing multicast copies and assume a network failure, but that is not the current evidence. Here, pIM Join packets repeatedly time out as the RP next hop changes, indicating rp address unicast reachability is unstable through recursive routes. The targeted action is Restore consistent routed reachability to the RP and PIM transit adjacencies.

Question 514

A provider RP is reachable through BGP but not directly via IGP. Observed: PIM Join packets repeatedly time out as the RP next hop changes. What evidence would validate recovery from this precise failure mode?

  1. With a deliberate receiver join, forwarding appears only on the subscribed branch.
  2. Joins reach the RP and sustained packet flow is observed.
  3. The multicast forwarding table lists the correct outgoing interfaces.
  4. Packets reach remote receivers without expanding beyond the allowed domain.

Explanation

Correct Answer

B:

The intended result is Joins reach the RP and sustained packet flow is observed. It specifically verifies recovery from rp address unicast reachability is unstable through recursive routes, which produced the original symptom: PIM Join packets repeatedly time out as the RP next hop changes. It is stronger evidence than a generic interface-up indicator.

Incorrect Answers

A:

That observation would verify a separate fault involving pim sparse mode rightly prunes branches without subscribed receivers. Its symptom is Operators report no outgoing multicast copies and assume a network failure. For this case the actual issue is rp address unicast reachability is unstable through recursive routes, and the relevant success signal is Joins reach the RP and sustained packet flow is observed.

C:

It confirms an unrelated service correction: The group join state does not propagate through the intended PIM path. The present case reports PIM Join packets repeatedly time out as the RP next hop changes. Its completion test is Joins reach the RP and sustained packet flow is observed.

D:

This result is useful in another case with evidence Subscribers several hops away receive no video although nearby receivers work. It does not test recovery from pim join packets repeatedly time out as the rp next hop changes. Check instead whether joins reach the RP and sustained packet flow is observed.

Question 515

A provider RP is reachable through BGP but not directly via IGP. Observed: PIM Join packets repeatedly time out as the RP next hop changes. What underlying protocol or service configuration problem best explains the evidence?

  1. PIM sparse mode rightly prunes branches without subscribed receivers.
  2. The group join state does not propagate through the intended PIM path.
  3. RP address unicast reachability is unstable through recursive routes.
  4. Source multicast TTL is too small to traverse the intended router depth.

Explanation

Correct Answer

C:

Because pIM Join packets repeatedly time out as the RP next hop changes, the likely cause is rp address unicast reachability is unstable through recursive routes. It is testable: Restore consistent routed reachability to the RP and PIM transit adjacencies. Expected follow-up: Joins reach the RP and sustained packet flow is observed.

Incorrect Answers

A:

The stated cause is possible elsewhere but explains operators report no outgoing multicast copies and assume a network failure, not pim join packets repeatedly time out as the rp next hop changes. This incident is better attributed to rp address unicast reachability is unstable through recursive routes.

B:

The group join state does not propagate through the intended PIM path. would normally be accompanied by edge receivers are active but the intermediate router has no outgoing interface list. The observed symptom is different: PIM Join packets repeatedly time out as the RP next hop changes. The likely cause is RP address unicast reachability is unstable through recursive routes.

D:

That explanation fits another condition: Subscribers several hops away receive no video although nearby receivers work. The evidence here is PIM Join packets repeatedly time out as the RP next hop changes. Its closer root cause is RP address unicast reachability is unstable through recursive routes.

Question 516

A provider RP is reachable through BGP but not directly via IGP. Observed: PIM Join packets repeatedly time out as the RP next hop changes. Which ongoing validation gate would best detect a recurrence of this problem?

  1. For each approved related change, verify that with a deliberate receiver join, forwarding appears only on the subscribed branch. Flag recurrence if operators report no outgoing multicast copies and assume a network failure.
  2. For each approved related change, verify that the multicast forwarding table lists the correct outgoing interfaces. Flag recurrence if edge receivers are active but the intermediate router has no outgoing interface list.
  3. For each approved related change, verify that joins reach the RP and sustained packet flow is observed. Flag recurrence if pIM Join packets repeatedly time out as the RP next hop changes.
  4. For each approved related change, verify that packets reach remote receivers without expanding beyond the allowed domain. Flag recurrence if subscribers several hops away receive no video although nearby receivers work.

Explanation

Correct Answer

C:

A useful regression gate tests whether joins reach the RP and sustained packet flow is observed and alerts when pIM Join packets repeatedly time out as the RP next hop changes. This directly checks the technical weakness: RP address unicast reachability is unstable through recursive routes. 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 pim sparse mode rightly prunes branches without subscribed receivers, typically observed when operators report no outgoing multicast copies and assume a network failure. Here the target is rp address unicast reachability is unstable through recursive routes; monitor joins reach the RP and sustained packet flow is observed.

B:

This gate monitors a different failure, edge receivers are active but the intermediate router has no outgoing interface list. It would not detect the current problem: PIM Join packets repeatedly time out as the RP next hop changes. The appropriate check requires joins reach the RP and sustained packet flow is observed.

D:

It is valid for another service scenario but checks subscribers several hops away receive no video although nearby receivers work. This case instead needs a gate for pim join packets repeatedly time out as the rp next hop changes and evidence that joins reach the RP and sustained packet flow is observed.

Question 517

A customer multicasts test traffic while no receivers are joined. Observed: Operators report no outgoing multicast copies and assume a network failure. Which change most directly corrects the failure while respecting the existing service boundary?

  1. Align PIM sparse mode across the transit and inspect group state.
  2. Move the relevant service to an appropriate sparse/SSM distribution policy.
  3. Verify receiver membership and join state before changing forwarding policy.
  4. Repair consistent unicast source-prefix reachability across the relevant areas.

Explanation

Correct Answer

C:

The observed condition is Operators report no outgoing multicast copies and assume a network failure. That indicates pim sparse mode rightly prunes branches without subscribed receivers. Applying the proposed remedy directly changes that condition. A concrete completion check is: With a deliberate receiver join, forwarding appears only on the subscribed branch.

Incorrect Answers

A:

The option may be useful when the link is in dense-mode flood-and-prune behavior rather than sparse-mode operation, but that is not the current evidence. Here, operators report no outgoing multicast copies and assume a network failure, indicating pim sparse mode rightly prunes branches without subscribed receivers. The targeted action is Verify receiver membership and join state before changing forwarding policy.

B:

This change belongs to a different IP Multicast issue: Traffic reaches links with no subscribers until prune state forms. That issue involves dense-mode initial flooding conflicts with the bandwidth-sensitive shared network. The current symptom is Operators report no outgoing multicast copies and assume a network failure. It instead requires verify receiver membership and join state before changing forwarding policy.

D:

This remediates reverse-path routing to the source differs across area boundaries, normally indicated by One receiver never sees the stream although the other is healthy. It would leave the observed problem (Operators report no outgoing multicast copies and assume a network failure) unresolved. Address it with verify receiver membership and join state before changing forwarding policy.

Question 518

A customer multicasts test traffic while no receivers are joined. Observed: Operators report no outgoing multicast copies and assume a network failure. After the correction, which result would most convincingly show that this fault is resolved?

  1. Both receiver routers pass RPF checks and forward the intended source tree.
  2. With a deliberate receiver join, forwarding appears only on the subscribed branch.
  3. Unsubscribed transit links no longer carry unnecessary multicast traffic.
  4. Only receiver-joined paths carry the multicast stream after convergence.

Explanation

Correct Answer

B:

After verify receiver membership and join state before changing forwarding policy, inspect whether with a deliberate receiver join, forwarding appears only on the subscribed branch. This closes the loop between the reported observation (Operators report no outgoing multicast copies and assume a network failure) and the underlying issue (PIM sparse mode rightly prunes branches without subscribed receivers).

Incorrect Answers

A:

This result is useful in another case with evidence One receiver never sees the stream although the other is healthy. It does not test recovery from operators report no outgoing multicast copies and assume a network failure. Check instead whether with a deliberate receiver join, forwarding appears only on the subscribed branch.

C:

It confirms an unrelated service correction: Dense-mode initial flooding conflicts with the bandwidth-sensitive shared network. The present case reports Operators report no outgoing multicast copies and assume a network failure. Its completion test is With a deliberate receiver join, forwarding appears only on the subscribed branch.

D:

That observation would verify a separate fault involving pim operating mode does not match the intended sparse distribution tree. Its symptom is The link is in dense-mode flood-and-prune behavior rather than sparse-mode operation. For this case the actual issue is pim sparse mode rightly prunes branches without subscribed receivers, and the relevant success signal is With a deliberate receiver join, forwarding appears only on the subscribed branch.

Question 519

A customer multicasts test traffic while no receivers are joined. Observed: Operators report no outgoing multicast copies and assume a network failure. Which root cause is most consistent with this symptom?

  1. Dense-mode initial flooding conflicts with the bandwidth-sensitive shared network.
  2. Reverse-path routing to the source differs across area boundaries.
  3. PIM operating mode does not match the intended sparse distribution tree.
  4. PIM sparse mode rightly prunes branches without subscribed receivers.

Explanation

Correct Answer

D:

The reported evidence—Operators report no outgoing multicast copies and assume a network failure—supports pim sparse mode rightly prunes branches without subscribed receivers. The appropriate intervention is to verify receiver membership and join state before changing forwarding policy, with confirmation from with a deliberate receiver join, forwarding appears only on the subscribed branch. Other causes require actual device-state verification.

Incorrect Answers

A:

Dense-mode initial flooding conflicts with the bandwidth-sensitive shared network. would normally be accompanied by traffic reaches links with no subscribers until prune state forms. The observed symptom is different: Operators report no outgoing multicast copies and assume a network failure. The likely cause is PIM sparse mode rightly prunes branches without subscribed receivers.

B:

That explanation fits another condition: One receiver never sees the stream although the other is healthy. The evidence here is Operators report no outgoing multicast copies and assume a network failure. Its closer root cause is PIM sparse mode rightly prunes branches without subscribed receivers.

C:

The stated cause is possible elsewhere but explains the link is in dense-mode flood-and-prune behavior rather than sparse-mode operation, not operators report no outgoing multicast copies and assume a network failure. This incident is better attributed to pim sparse mode rightly prunes branches without subscribed receivers.

Question 520

A customer multicasts test traffic while no receivers are joined. Observed: Operators report no outgoing multicast copies and assume a network failure. Which change-acceptance control is most relevant to preventing this exact failure?

  1. For each approved related change, verify that both receiver routers pass RPF checks and forward the intended source tree. Flag recurrence if one receiver never sees the stream although the other is healthy.
  2. For each approved related change, verify that with a deliberate receiver join, forwarding appears only on the subscribed branch. Flag recurrence if operators report no outgoing multicast copies and assume a network failure.
  3. For each approved related change, verify that only receiver-joined paths carry the multicast stream after convergence. Flag recurrence if the link is in dense-mode flood-and-prune behavior rather than sparse-mode operation.
  4. For each approved related change, verify that unsubscribed transit links no longer carry unnecessary multicast traffic. Flag recurrence if traffic reaches links with no subscribers until prune state forms.

Explanation

Correct Answer

B:

The control is specific to the initial failure. It requires the result With a deliberate receiver join, forwarding appears only on the subscribed branch. and treats Operators report no outgoing multicast copies and assume a network failure. as a failure signal. The causal concern is pim sparse mode rightly prunes branches without subscribed receivers.

Incorrect Answers

A:

It is valid for another service scenario but checks one receiver never sees the stream although the other is healthy. This case instead needs a gate for operators report no outgoing multicast copies and assume a network failure and evidence that with a deliberate receiver join, forwarding appears only on the subscribed branch.

C:

The proposed control is tied to pim operating mode does not match the intended sparse distribution tree, typically observed when the link is in dense-mode flood-and-prune behavior rather than sparse-mode operation. Here the target is pim sparse mode rightly prunes branches without subscribed receivers; monitor with a deliberate receiver join, forwarding appears only on the subscribed branch.

D:

This gate monitors a different failure, traffic reaches links with no subscribers until prune state forms. It would not detect the current problem: Operators report no outgoing multicast copies and assume a network failure. The appropriate check requires with a deliberate receiver join, forwarding appears only on the subscribed branch.

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