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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 55

Question 540

A provider configures a multicast group filter at access ingress. Observed: A valid service group never creates IGMP membership on the PE. Which ongoing validation gate would best detect a recurrence of this problem?

  1. For each approved related change, verify that intended groups appear in membership state while prohibited groups remain excluded. Flag recurrence if a valid service group never creates IGMP membership on the PE.
  2. For each approved related change, verify that rPF checks succeed and packets forward along the source tree. Flag recurrence if packets are dropped by reverse-path-forwarding checks.
  3. 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.
  4. For each approved related change, verify that both RPs know registered active sources and either can serve receivers. Flag recurrence if two RP nodes disagree on active source registrations.

Explanation

Correct Answer

A:

A useful regression gate tests whether intended groups appear in membership state while prohibited groups remain excluded and alerts when a valid service group never creates IGMP membership on the PE. This directly checks the technical weakness: The group filter mistakenly denies the contracted multicast address. The gate is derived from the fictional incident and is not an independent Juniper engineer signoff.

Incorrect Answers

B:

It is valid for another service scenario but checks packets are dropped by reverse-path-forwarding checks. This case instead needs a gate for a valid service group never creates igmp membership on the pe and evidence that intended groups appear in membership state while prohibited groups remain excluded.

C:

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 the group filter mistakenly denies the contracted multicast address; monitor intended groups appear in membership state while prohibited groups remain excluded.

D:

This gate monitors a different failure, two rp nodes disagree on active source registrations. It would not detect the current problem: A valid service group never creates IGMP membership on the PE. The appropriate check requires intended groups appear in membership state while prohibited groups remain excluded.

Question 541

A router receives both (*,G) and (S,G) multicast state for a channel. Observed: Shared-tree traffic continues after the receiver requests shortest-path switchover. Which change most directly corrects the failure while respecting the existing service boundary?

  1. Set the intended switch-to-source-tree behavior and verify RPF route selection.
  2. Set compatible IGMPv3 processing and verify source filters.
  3. Increase source TTL to the minimal approved value and confirm routed path.
  4. Configure supported Anycast RP or redundant RP discovery with proper synchronization.

Explanation

Correct Answer

A:

The observed condition is Shared-tree traffic continues after the receiver requests shortest-path switchover. That indicates spt threshold or pim source-tree behavior is not aligned to the service policy. Applying the proposed remedy directly changes that condition. A concrete completion check is: (S,G) forwarding follows the expected shortest-path tree after switchover.

Incorrect Answers

B:

The option may be useful when iGMPv3 receivers cannot express source include lists to the router, but that is not the current evidence. Here, shared-tree traffic continues after the receiver requests shortest-path switchover, indicating spt threshold or pim source-tree behavior is not aligned to the service policy. The targeted action is Set the intended switch-to-source-tree behavior and verify RPF route selection.

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 (Shared-tree traffic continues after the receiver requests shortest-path switchover) unresolved. Address it with set the intended switch-to-source-tree behavior and verify RPF route selection.

D:

This change belongs to a different IP Multicast issue: One RP fails but receivers stay joined to a dead shared tree. That issue involves rp redundancy and discovery were not implemented for the asm service. The current symptom is Shared-tree traffic continues after the receiver requests shortest-path switchover. It instead requires set the intended switch-to-source-tree behavior and verify RPF route selection.

Question 542

A router receives both (*,G) and (S,G) multicast state for a channel. Observed: Shared-tree traffic continues after the receiver requests shortest-path switchover. After the correction, which result would most convincingly show that this fault is resolved?

  1. (S,G) forwarding follows the expected shortest-path tree after switchover.
  2. The interface records expected source-specific membership state.
  3. Failover retains multicast delivery without stale RP dependency.
  4. Packets reach remote receivers without expanding beyond the allowed domain.

Explanation

Correct Answer

A:

After set the intended switch-to-source-tree behavior and verify RPF route selection, inspect whether (S,G) forwarding follows the expected shortest-path tree after switchover. This closes the loop between the reported observation (Shared-tree traffic continues after the receiver requests shortest-path switchover) and the underlying issue (SPT threshold or PIM source-tree behavior is not aligned to the service policy).

Incorrect Answers

B:

That observation would verify a separate fault involving local igmp version is fixed at an earlier membership model. Its symptom is IGMPv3 receivers cannot express source include lists to the router. For this case the actual issue is spt threshold or pim source-tree behavior is not aligned to the service policy, and the relevant success signal is (S,G) forwarding follows the expected shortest-path tree after switchover.

C:

It confirms an unrelated service correction: RP redundancy and discovery were not implemented for the ASM service. The present case reports Shared-tree traffic continues after the receiver requests shortest-path switchover. Its completion test is (S,G) forwarding follows the expected shortest-path tree after switchover.

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 shared-tree traffic continues after the receiver requests shortest-path switchover. Check instead whether (S,G) forwarding follows the expected shortest-path tree after switchover.

Question 543

A router receives both (*,G) and (S,G) multicast state for a channel. Observed: Shared-tree traffic continues after the receiver requests shortest-path switchover. Which root cause is most consistent with this symptom?

  1. Source multicast TTL is too small to traverse the intended router depth.
  2. SPT threshold or PIM source-tree behavior is not aligned to the service policy.
  3. Local IGMP version is fixed at an earlier membership model.
  4. RP redundancy and discovery were not implemented for the ASM service.

Explanation

Correct Answer

B:

The reported evidence—Shared-tree traffic continues after the receiver requests shortest-path switchover—supports spt threshold or pim source-tree behavior is not aligned to the service policy. The appropriate intervention is to set the intended switch-to-source-tree behavior and verify RPF route selection, with confirmation from (S,G) forwarding follows the expected shortest-path tree after switchover. Other causes require actual device-state verification.

Incorrect Answers

A:

That explanation fits another condition: Subscribers several hops away receive no video although nearby receivers work. The evidence here is Shared-tree traffic continues after the receiver requests shortest-path switchover. Its closer root cause is SPT threshold or PIM source-tree behavior is not aligned to the service policy.

C:

The stated cause is possible elsewhere but explains igmpv3 receivers cannot express source include lists to the router, not shared-tree traffic continues after the receiver requests shortest-path switchover. This incident is better attributed to spt threshold or pim source-tree behavior is not aligned to the service policy.

D:

RP redundancy and discovery were not implemented for the ASM service. would normally be accompanied by one rp fails but receivers stay joined to a dead shared tree. The observed symptom is different: Shared-tree traffic continues after the receiver requests shortest-path switchover. The likely cause is SPT threshold or PIM source-tree behavior is not aligned to the service policy.

Question 544

A router receives both (*,G) and (S,G) multicast state for a channel. Observed: Shared-tree traffic continues after the receiver requests shortest-path switchover. 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 (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.
  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

B:

The control is specific to the initial failure. It requires the result (S,G) forwarding follows the expected shortest-path tree after switchover. and treats Shared-tree traffic continues after the receiver requests shortest-path switchover. as a failure signal. The causal concern is spt threshold or pim source-tree behavior is not aligned to the service policy.

Incorrect Answers

A:

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 shared-tree traffic continues after the receiver requests shortest-path switchover and evidence that (S,G) forwarding follows the expected shortest-path tree after switchover.

C:

This gate monitors a different failure, one rp fails but receivers stay joined to a dead shared tree. It would not detect the current problem: Shared-tree traffic continues after the receiver requests shortest-path switchover. The appropriate check requires (S,G) forwarding follows the expected shortest-path tree after switchover.

D:

The proposed control is tied to local igmp version is fixed at an earlier membership model, typically observed when iGMPv3 receivers cannot express source include lists to the router. Here the target is spt threshold or pim source-tree behavior is not aligned to the service policy; monitor (S,G) forwarding follows the expected shortest-path tree after switchover.

Question 545

An IPTV source sends traffic with an unexpected TTL. Observed: Subscribers several hops away receive no video although nearby receivers work. What should the routing engineer change first to address this particular symptom?

  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. Move the relevant service to an appropriate sparse/SSM distribution policy.

Explanation

Correct Answer

C:

The decisive evidence is that Subscribers several hops away receive no video although nearby receivers work. This follows from source multicast ttl is too small to traverse the intended router depth. The focused remedy is to increase source TTL to the minimal approved value and confirm routed path. Confirm improvement when packets reach remote receivers without expanding beyond the allowed domain. Validate on an approved lab or change window before touching production.

Incorrect Answers

A:

This remediates rp address unicast reachability is unstable through recursive routes, normally indicated by PIM Join packets repeatedly time out as the RP next hop changes. It would leave the observed problem (Subscribers several hops away receive no video although nearby receivers work) unresolved. Address it with increase source TTL to the minimal approved value and confirm routed path.

B:

The option may be useful when edge receivers are active but the intermediate router has no outgoing interface list, but that is not the current evidence. Here, subscribers several hops away receive no video although nearby receivers work, indicating source multicast ttl is too small to traverse the intended router depth. The targeted action is Increase source TTL to the minimal approved value and confirm routed path.

D:

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 Subscribers several hops away receive no video although nearby receivers work. It instead requires increase source TTL to the minimal approved value and confirm routed path.

Question 546

An IPTV source sends traffic with an unexpected TTL. Observed: Subscribers several hops away receive no video although nearby receivers work. Which acceptance observation best confirms that the proposed change worked?

  1. Unsubscribed transit links no longer carry unnecessary multicast traffic.
  2. Packets reach remote receivers without expanding beyond the allowed domain.
  3. The multicast forwarding table lists the correct outgoing interfaces.
  4. Joins reach the RP and sustained packet flow is observed.

Explanation

Correct Answer

B:

This acceptance criterion tests the actual fault. The source evidence was Subscribers several hops away receive no video although nearby receivers work. The correction addresses source multicast ttl is too small to traverse the intended router depth; success requires packets reach remote receivers without expanding beyond the allowed domain.

Incorrect Answers

A:

It confirms an unrelated service correction: Dense-mode initial flooding conflicts with the bandwidth-sensitive shared network. The present case reports Subscribers several hops away receive no video although nearby receivers work. Its completion test is Packets reach remote receivers without expanding beyond the allowed domain.

C:

That observation would verify a separate fault involving the group join state does not propagate through the intended pim path. Its symptom is Edge receivers are active but the intermediate router has no outgoing interface list. For this case the actual issue is source multicast ttl is too small to traverse the intended router depth, and the relevant success signal is Packets reach remote receivers without expanding beyond the allowed domain.

D:

This result is useful in another case with evidence PIM Join packets repeatedly time out as the RP next hop changes. It does not test recovery from subscribers several hops away receive no video although nearby receivers work. Check instead whether packets reach remote receivers without expanding beyond the allowed domain.

Question 547

An IPTV source sends traffic with an unexpected TTL. Observed: Subscribers several hops away receive no video although nearby receivers work. What is the most likely source of the observed routing or service failure?

  1. Dense-mode initial flooding conflicts with the bandwidth-sensitive shared network.
  2. The group join state does not propagate through the intended PIM path.
  3. Source multicast TTL is too small to traverse the intended router depth.
  4. RP address unicast reachability is unstable through recursive routes.

Explanation

Correct Answer

C:

This explanation is the closest match to the observed symptom: Subscribers several hops away receive no video although nearby receivers work. The specified root issue is Source multicast TTL is too small to traverse the intended router depth. Repair it through increase source TTL to the minimal approved value and confirm routed path, then check packets reach remote receivers without expanding beyond the allowed domain.

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: Subscribers several hops away receive no video although nearby receivers work. The likely cause is Source multicast TTL is too small to traverse the intended router depth.

B:

The stated cause is possible elsewhere but explains edge receivers are active but the intermediate router has no outgoing interface list, not subscribers several hops away receive no video although nearby receivers work. This incident is better attributed to source multicast ttl is too small to traverse the intended router depth.

D:

That explanation fits another condition: PIM Join packets repeatedly time out as the RP next hop changes. The evidence here is Subscribers several hops away receive no video although nearby receivers work. Its closer root cause is Source multicast TTL is too small to traverse the intended router depth.

Question 548

An IPTV source sends traffic with an unexpected TTL. Observed: Subscribers several hops away receive no video although nearby receivers work. What operational check best guards against this problem returning?

  1. 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.
  2. 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.
  3. 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.
  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

C:

This control asks for the same recovery evidence (Packets reach remote receivers without expanding beyond the allowed domain) and flags recurrence of the same failure (Subscribers several hops away receive no video although nearby receivers work). It targets the underlying issue, source multicast ttl is too small to traverse the intended router depth, 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 pim join packets repeatedly time out as the rp next hop changes. This case instead needs a gate for subscribers several hops away receive no video although nearby receivers work and evidence that packets reach remote receivers without expanding beyond the allowed domain.

B:

This gate monitors a different failure, traffic reaches links with no subscribers until prune state forms. It would not detect the current problem: Subscribers several hops away receive no video although nearby receivers work. The appropriate check requires packets reach remote receivers without expanding beyond the allowed domain.

D:

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 source multicast ttl is too small to traverse the intended router depth; monitor packets reach remote receivers without expanding beyond the allowed domain.

Question 549

A video provider runs PIM dense mode on a shared transit interface. Observed: Traffic reaches links with no subscribers until prune state forms. Which targeted remediation is most appropriate for the observed condition?

  1. Align PIM sparse mode across the transit and inspect group state.
  2. Reconcile multicast reverse-path policy with approved source reachability.
  3. Move the relevant service to an appropriate sparse/SSM distribution policy.
  4. Verify receiver membership and join state before changing forwarding policy.

Explanation

Correct Answer

C:

This fix addresses the stated cause rather than an unrelated protocol. The reported symptom—Traffic reaches links with no subscribers until prune state forms—is consistent with dense-mode initial flooding conflicts with the bandwidth-sensitive shared network. Use the specified correction, then verify: Unsubscribed transit links no longer carry unnecessary multicast traffic. Preserve existing policy and tenant isolation.

Incorrect Answers

A:

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 (Traffic reaches links with no subscribers until prune state forms) unresolved. Address it with move the relevant service to an appropriate sparse/SSM distribution policy.

B:

The option may be useful when multicast stream briefly loops and then disappears even though source route remains in RIB, but that is not the current evidence. Here, traffic reaches links with no subscribers until prune state forms, indicating dense-mode initial flooding conflicts with the bandwidth-sensitive shared network. The targeted action is Move the relevant service to an appropriate sparse/SSM distribution policy.

D:

This change belongs to a different IP Multicast issue: Operators report no outgoing multicast copies and assume a network failure. That issue involves pim sparse mode rightly prunes branches without subscribed receivers. The current symptom is Traffic reaches links with no subscribers until prune state forms. It instead requires move the relevant service to an appropriate sparse/SSM distribution policy.

Question 550

A video provider runs PIM dense mode on a shared transit interface. Observed: Traffic reaches links with no subscribers until prune state forms. What evidence would validate recovery from this precise failure mode?

  1. Unsubscribed transit links no longer carry unnecessary multicast traffic.
  2. Only receiver-joined paths carry the multicast stream after convergence.
  3. The RPF interface and incoming packets agree with no continuing loop or drop.
  4. With a deliberate receiver join, forwarding appears only on the subscribed branch.

Explanation

Correct Answer

A:

The intended result is Unsubscribed transit links no longer carry unnecessary multicast traffic. It specifically verifies recovery from dense-mode initial flooding conflicts with the bandwidth-sensitive shared network, which produced the original symptom: Traffic reaches links with no subscribers until prune state forms. It is stronger evidence than a generic interface-up indicator.

Incorrect Answers

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 traffic reaches links with no subscribers until prune state forms. Check instead whether unsubscribed transit links no longer carry unnecessary multicast traffic.

C:

That observation would verify a separate fault involving rpf-specific policy chooses an unintended interface relative to actual source arrival. Its symptom is Multicast stream briefly loops and then disappears even though source route remains in RIB. For this case the actual issue is dense-mode initial flooding conflicts with the bandwidth-sensitive shared network, and the relevant success signal is Unsubscribed transit links no longer carry unnecessary multicast traffic.

D:

It confirms an unrelated service correction: PIM sparse mode rightly prunes branches without subscribed receivers. The present case reports Traffic reaches links with no subscribers until prune state forms. Its completion test is Unsubscribed transit links no longer carry unnecessary multicast traffic.

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