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 49

Question 480

A PIM sparse-mode domain has two possible rendezvous points. Observed: One RP fails but receivers stay joined to a dead shared tree. Which ongoing validation gate would best detect a recurrence of this problem?

  1. 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.
  2. 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.
  3. 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.
  4. 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.

Explanation

Correct Answer

B:

A useful regression gate tests whether failover retains multicast delivery without stale RP dependency and alerts when one RP fails but receivers stay joined to a dead shared tree. This directly checks the technical weakness: RP redundancy and discovery were not implemented for the ASM service. The gate is derived from the fictional incident and is not an independent Juniper engineer signoff.

Incorrect Answers

A:

It is valid for another service scenario but checks igmpv3 receivers cannot express source include lists to the router. This case instead needs a gate for one rp fails but receivers stay joined to a dead shared tree and evidence that failover retains multicast delivery without stale RP dependency.

C:

The proposed control is tied to the group join state does not propagate through the intended pim path, typically observed when edge receivers are active but the intermediate router has no outgoing interface list. Here the target is rp redundancy and discovery were not implemented for the asm service; monitor failover retains multicast delivery without stale RP dependency.

D:

This gate monitors a different failure, shared-tree traffic continues after the receiver requests shortest-path switchover. It would not detect the current problem: One RP fails but receivers stay joined to a dead shared tree. The appropriate check requires failover retains multicast delivery without stale RP dependency.

Question 481

An IPTV service crosses several multicast routers. Observed: Edge receivers are active but the intermediate router has no outgoing interface list. Which change most directly corrects the failure while respecting the existing service boundary?

  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. Align PIM sparse mode across the transit and inspect group state.
  4. Increase source TTL to the minimal approved value and confirm routed path.

Explanation

Correct Answer

B:

The observed condition is Edge receivers are active but the intermediate router has no outgoing interface list. That indicates the group join state does not propagate through the intended pim path. Applying the proposed remedy directly changes that condition. A concrete completion check is: The multicast forwarding table lists the correct outgoing interfaces.

Incorrect Answers

A:

This change belongs to a different IP Multicast issue: PIM Join packets repeatedly time out as the RP next hop changes. That issue involves rp address unicast reachability is unstable through recursive routes. The current symptom is Edge receivers are active but the intermediate router has no outgoing interface list. It instead requires trace upstream Join messages and restore PIM neighbor and multicast routing state.

C:

This remediates pim operating mode does not match the intended sparse distribution tree, normally indicated by The link is in dense-mode flood-and-prune behavior rather than sparse-mode operation. It would leave the observed problem (Edge receivers are active but the intermediate router has no outgoing interface list) unresolved. Address it with trace upstream Join messages and restore PIM neighbor and multicast routing state.

D:

The option may be useful when subscribers several hops away receive no video although nearby receivers work, but that is not the current evidence. Here, edge receivers are active but the intermediate router has no outgoing interface list, indicating the group join state does not propagate through the intended pim path. The targeted action is Trace upstream Join messages and restore PIM neighbor and multicast routing state.

Question 482

An IPTV service crosses several multicast routers. Observed: Edge receivers are active but the intermediate router has no outgoing interface list. After the correction, which result would most convincingly show that this fault is resolved?

  1. Joins reach the RP and sustained packet flow is observed.
  2. Only receiver-joined paths carry the multicast stream after convergence.
  3. Packets reach remote receivers without expanding beyond the allowed domain.
  4. The multicast forwarding table lists the correct outgoing interfaces.

Explanation

Correct Answer

D:

After trace upstream Join messages and restore PIM neighbor and multicast routing state, inspect whether the multicast forwarding table lists the correct outgoing interfaces. This closes the loop between the reported observation (Edge receivers are active but the intermediate router has no outgoing interface list) and the underlying issue (The group join state does not propagate through the intended PIM path).

Incorrect Answers

A:

It confirms an unrelated service correction: RP address unicast reachability is unstable through recursive routes. The present case reports Edge receivers are active but the intermediate router has no outgoing interface list. Its completion test is The multicast forwarding table lists the correct outgoing interfaces.

B:

This result is useful in another case with evidence The link is in dense-mode flood-and-prune behavior rather than sparse-mode operation. It does not test recovery from edge receivers are active but the intermediate router has no outgoing interface list. Check instead whether the multicast forwarding table lists the correct outgoing interfaces.

C:

That observation would verify a separate fault involving source multicast ttl is too small to traverse the intended router depth. Its symptom is Subscribers several hops away receive no video although nearby receivers work. For this case the actual issue is the group join state does not propagate through the intended pim path, and the relevant success signal is The multicast forwarding table lists the correct outgoing interfaces.

Question 483

An IPTV service crosses several multicast routers. Observed: Edge receivers are active but the intermediate router has no outgoing interface list. Which root cause is most consistent with this symptom?

  1. PIM operating mode does not match the intended sparse distribution tree.
  2. Source multicast TTL is too small to traverse the intended router depth.
  3. The group join state does not propagate through the intended PIM path.
  4. RP address unicast reachability is unstable through recursive routes.

Explanation

Correct Answer

C:

The reported evidence—Edge receivers are active but the intermediate router has no outgoing interface list—supports the group join state does not propagate through the intended pim path. The appropriate intervention is to trace upstream Join messages and restore PIM neighbor and multicast routing state, with confirmation from the multicast forwarding table lists the correct outgoing interfaces. Other causes require actual device-state verification.

Incorrect Answers

A:

That explanation fits another condition: The link is in dense-mode flood-and-prune behavior rather than sparse-mode operation. The evidence here is Edge receivers are active but the intermediate router has no outgoing interface list. Its closer root cause is The group join state does not propagate through the intended PIM path.

B:

The stated cause is possible elsewhere but explains subscribers several hops away receive no video although nearby receivers work, not edge receivers are active but the intermediate router has no outgoing interface list. This incident is better attributed to the group join state does not propagate through the intended pim path.

D:

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: Edge receivers are active but the intermediate router has no outgoing interface list. The likely cause is The group join state does not propagate through the intended PIM path.

Question 484

An IPTV service crosses several multicast routers. Observed: Edge receivers are active but the intermediate router has no outgoing interface list. Which change-acceptance control is most relevant to preventing this exact failure?

  1. 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.
  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 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 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.

Explanation

Correct Answer

D:

The control is specific to the initial failure. It requires the result The multicast forwarding table lists the correct outgoing interfaces. and treats Edge receivers are active but the intermediate router has no outgoing interface list. as a failure signal. The causal concern is the group join state does not propagate through the intended pim path.

Incorrect Answers

A:

The proposed control is tied to source multicast ttl is too small to traverse the intended router depth, typically observed when subscribers several hops away receive no video although nearby receivers work. Here the target is the group join state does not propagate through the intended pim path; monitor the multicast forwarding table lists the correct outgoing interfaces.

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: Edge receivers are active but the intermediate router has no outgoing interface list. The appropriate check requires the multicast forwarding table lists the correct outgoing interfaces.

C:

It is valid for another service scenario but checks the link is in dense-mode flood-and-prune behavior rather than sparse-mode operation. This case instead needs a gate for edge receivers are active but the intermediate router has no outgoing interface list and evidence that the multicast forwarding table lists the correct outgoing interfaces.

Question 485

A customer PIM router sees group data flooded across an undesired backup link. Observed: The link is in dense-mode flood-and-prune behavior rather than sparse-mode operation. What should the routing engineer change first to address this particular symptom?

  1. Verify receiver membership and join state before changing forwarding policy.
  2. Move the relevant service to an appropriate sparse/SSM distribution policy.
  3. Check IGMP version and group joins on the access side and PIM on the upstream side.
  4. Align PIM sparse mode across the transit and inspect group state.

Explanation

Correct Answer

D:

The decisive evidence is that The link is in dense-mode flood-and-prune behavior rather than sparse-mode operation. This follows from pim operating mode does not match the intended sparse distribution tree. The focused remedy is to align PIM sparse mode across the transit and inspect group state. Confirm improvement when only receiver-joined paths carry the multicast stream after convergence. Validate on an approved lab or change window before touching production.

Incorrect Answers

A:

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, the link is in dense-mode flood-and-prune behavior rather than sparse-mode operation, indicating pim operating mode does not match the intended sparse distribution tree. The targeted action is Align PIM sparse mode across the transit and inspect group state.

B:

This remediates dense-mode initial flooding conflicts with the bandwidth-sensitive shared network, normally indicated by Traffic reaches links with no subscribers until prune state forms. It would leave the observed problem (The link is in dense-mode flood-and-prune behavior rather than sparse-mode operation) unresolved. Address it with align PIM sparse mode across the transit and inspect group state.

C:

This change belongs to a different IP Multicast issue: The upstream PE never adds the receiver interface to its forwarding state. That issue involves igmp membership reporting or the igmp-to-pim boundary is misconfigured. The current symptom is The link is in dense-mode flood-and-prune behavior rather than sparse-mode operation. It instead requires align PIM sparse mode across the transit and inspect group state.

Question 486

A customer PIM router sees group data flooded across an undesired backup link. Observed: The link is in dense-mode flood-and-prune behavior rather than sparse-mode operation. Which acceptance observation best confirms that the proposed change worked?

  1. Only receiver-joined paths carry the multicast stream after convergence.
  2. With a deliberate receiver join, forwarding appears only on the subscribed branch.
  3. The PE maps the local membership into forwarding toward the receiver.
  4. Unsubscribed transit links no longer carry unnecessary multicast traffic.

Explanation

Correct Answer

A:

This acceptance criterion tests the actual fault. The source evidence was The link is in dense-mode flood-and-prune behavior rather than sparse-mode operation. The correction addresses pim operating mode does not match the intended sparse distribution tree; success requires only receiver-joined paths carry the multicast stream after convergence.

Incorrect Answers

B:

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 pim operating mode does not match the intended sparse distribution tree, and the relevant success signal is Only receiver-joined paths carry the multicast stream after convergence.

C:

It confirms an unrelated service correction: IGMP membership reporting or the IGMP-to-PIM boundary is misconfigured. The present case reports The link is in dense-mode flood-and-prune behavior rather than sparse-mode operation. Its completion test is Only receiver-joined paths carry the multicast stream after convergence.

D:

This result is useful in another case with evidence Traffic reaches links with no subscribers until prune state forms. It does not test recovery from the link is in dense-mode flood-and-prune behavior rather than sparse-mode operation. Check instead whether only receiver-joined paths carry the multicast stream after convergence.

Question 487

A customer PIM router sees group data flooded across an undesired backup link. Observed: The link is in dense-mode flood-and-prune behavior rather than sparse-mode operation. What is the most likely source of the observed routing or service failure?

  1. PIM sparse mode rightly prunes branches without subscribed receivers.
  2. PIM operating mode does not match the intended sparse distribution tree.
  3. Dense-mode initial flooding conflicts with the bandwidth-sensitive shared network.
  4. IGMP membership reporting or the IGMP-to-PIM boundary is misconfigured.

Explanation

Correct Answer

B:

This explanation is the closest match to the observed symptom: The link is in dense-mode flood-and-prune behavior rather than sparse-mode operation. The specified root issue is PIM operating mode does not match the intended sparse distribution tree. Repair it through align PIM sparse mode across the transit and inspect group state, then check only receiver-joined paths carry the multicast stream after convergence.

Incorrect Answers

A:

The stated cause is possible elsewhere but explains operators report no outgoing multicast copies and assume a network failure, not the link is in dense-mode flood-and-prune behavior rather than sparse-mode operation. This incident is better attributed to pim operating mode does not match the intended sparse distribution tree.

C:

That explanation fits another condition: Traffic reaches links with no subscribers until prune state forms. The evidence here is The link is in dense-mode flood-and-prune behavior rather than sparse-mode operation. Its closer root cause is PIM operating mode does not match the intended sparse distribution tree.

D:

IGMP membership reporting or the IGMP-to-PIM boundary is misconfigured. would normally be accompanied by the upstream pe never adds the receiver interface to its forwarding state. The observed symptom is different: The link is in dense-mode flood-and-prune behavior rather than sparse-mode operation. The likely cause is PIM operating mode does not match the intended sparse distribution tree.

Question 488

A customer PIM router sees group data flooded across an undesired backup link. Observed: The link is in dense-mode flood-and-prune behavior rather than sparse-mode operation. What operational check best guards against this problem returning?

  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 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.
  3. For each approved related change, verify that the PE maps the local membership into forwarding toward the receiver. Flag recurrence if the upstream PE never adds the receiver interface to its forwarding state.
  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:

This control asks for the same recovery evidence (Only receiver-joined paths carry the multicast stream after convergence) and flags recurrence of the same failure (The link is in dense-mode flood-and-prune behavior rather than sparse-mode operation). It targets the underlying issue, pim operating mode does not match the intended sparse distribution tree, rather than a different service problem. The exact cadence must be agreed with operations.

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 pim operating mode does not match the intended sparse distribution tree; monitor only receiver-joined paths carry the multicast stream after convergence.

C:

This gate monitors a different failure, the upstream pe never adds the receiver interface to its forwarding state. It would not detect the current problem: The link is in dense-mode flood-and-prune behavior rather than sparse-mode operation. The appropriate check requires only receiver-joined paths carry the multicast stream after convergence.

D:

It is valid for another service scenario but checks traffic reaches links with no subscribers until prune state forms. This case instead needs a gate for the link is in dense-mode flood-and-prune behavior rather than sparse-mode operation and evidence that only receiver-joined paths carry the multicast stream after convergence.

Question 489

An access switch reports valid IGMP membership for a pay-TV channel. Observed: The upstream PE never adds the receiver interface to its forwarding state. Which targeted remediation is most appropriate for the observed condition?

  1. Reconcile multicast reverse-path policy with approved source reachability.
  2. Check IGMP version and group joins on the access side and PIM on the upstream side.
  3. Correct unicast source routing or relocate the source ingress to the expected RPF interface.
  4. Repair consistent unicast source-prefix reachability across the relevant areas.

Explanation

Correct Answer

B:

This fix addresses the stated cause rather than an unrelated protocol. The reported symptom—The upstream PE never adds the receiver interface to its forwarding state—is consistent with igmp membership reporting or the igmp-to-pim boundary is misconfigured. Use the specified correction, then verify: The PE maps the local membership into forwarding toward the receiver. Preserve existing policy and tenant isolation.

Incorrect Answers

A:

This change belongs to a different IP Multicast issue: Multicast stream briefly loops and then disappears even though source route remains in RIB. That issue involves rpf-specific policy chooses an unintended interface relative to actual source arrival. The current symptom is The upstream PE never adds the receiver interface to its forwarding state. It instead requires check IGMP version and group joins on the access side and PIM on the upstream side.

C:

The option may be useful when pIM RPF discards increase when routing chooses the other uplink, but that is not the current evidence. Here, the upstream PE never adds the receiver interface to its forwarding state, indicating igmp membership reporting or the igmp-to-pim boundary is misconfigured. The targeted action is Check IGMP version and group joins on the access side and PIM on the upstream side.

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 (The upstream PE never adds the receiver interface to its forwarding state) unresolved. Address it with check IGMP version and group joins on the access side and PIM on the upstream side.

Question 490

An access switch reports valid IGMP membership for a pay-TV channel. Observed: The upstream PE never adds the receiver interface to its forwarding state. What evidence would validate recovery from this precise failure mode?

  1. Both receiver routers pass RPF checks and forward the intended source tree.
  2. RPF counter increments stop and stream continuity returns.
  3. The PE maps the local membership into forwarding toward the receiver.
  4. The RPF interface and incoming packets agree with no continuing loop or drop.

Explanation

Correct Answer

C:

The intended result is The PE maps the local membership into forwarding toward the receiver. It specifically verifies recovery from igmp membership reporting or the igmp-to-pim boundary is misconfigured, which produced the original symptom: The upstream PE never adds the receiver interface to its forwarding state. It is stronger evidence than a generic interface-up indicator.

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 the upstream pe never adds the receiver interface to its forwarding state. Check instead whether the PE maps the local membership into forwarding toward the receiver.

B:

That observation would verify a separate fault involving the incoming interface differs from the preferred unicast reverse path to the source. Its symptom is PIM RPF discards increase when routing chooses the other uplink. For this case the actual issue is igmp membership reporting or the igmp-to-pim boundary is misconfigured, and the relevant success signal is The PE maps the local membership into forwarding toward the receiver.

D:

It confirms an unrelated service correction: RPF-specific policy chooses an unintended interface relative to actual source arrival. The present case reports The upstream PE never adds the receiver interface to its forwarding state. Its completion test is The PE maps the local membership into forwarding toward the receiver.

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