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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 48

Question 470

An IPTV receiver joins an SSM multicast channel. Observed: The route never appears despite an active local IGMPv2 membership. After the correction, which result would most convincingly show that this fault is resolved?

  1. Both old ASM and new SSM groups build trees appropriate to their mode.
  2. Customer receiver receives packets with correct isolated MVPN forwarding.
  3. RPF checks succeed and packets forward along the source tree.
  4. The receiver establishes an (S,G) state for the intended channel.

Explanation

Correct Answer

D:

After enable IGMPv3 and configure a matching source and group membership, inspect whether the receiver establishes an (S,G) state for the intended channel. This closes the loop between the reported observation (The route never appears despite an active local IGMPv2 membership) and the underlying issue (Source-specific join signaling requires IGMPv3 or supported source filters).

Incorrect Answers

A:

It confirms an unrelated service correction: SSM group-range classification overlaps with the existing ASM service. The present case reports The route never appears despite an active local IGMPv2 membership. Its completion test is The receiver establishes an (S,G) state for the intended channel.

B:

That observation would verify a separate fault involving multicast vpn service control signaling and transport tunnel mapping do not match. Its symptom is The provider MVPN receives control routes but does not deliver customer stream data. For this case the actual issue is source-specific join signaling requires igmpv3 or supported source filters, and the relevant success signal is The receiver establishes an (S,G) state for the intended channel.

C:

This result is useful in another case with evidence Packets are dropped by reverse-path-forwarding checks. It does not test recovery from the route never appears despite an active local igmpv2 membership. Check instead whether the receiver establishes an (S,G) state for the intended channel.

Question 471

An IPTV receiver joins an SSM multicast channel. Observed: The route never appears despite an active local IGMPv2 membership. Which root cause is most consistent with this symptom?

  1. Source-specific join signaling requires IGMPv3 or supported source filters.
  2. SSM group-range classification overlaps with the existing ASM service.
  3. Multicast VPN service control signaling and transport tunnel mapping do not match.
  4. Unicast routing points toward the source through a different incoming interface.

Explanation

Correct Answer

A:

The reported evidence—The route never appears despite an active local IGMPv2 membership—supports source-specific join signaling requires igmpv3 or supported source filters. The appropriate intervention is to enable IGMPv3 and configure a matching source and group membership, with confirmation from the receiver establishes an (S,G) state for the intended channel. Other causes require actual device-state verification.

Incorrect Answers

B:

SSM group-range classification overlaps with the existing ASM service. would normally be accompanied by a legacy asm group is interpreted as source-specific and cannot use its rp. The observed symptom is different: The route never appears despite an active local IGMPv2 membership. The likely cause is Source-specific join signaling requires IGMPv3 or supported source filters.

C:

The stated cause is possible elsewhere but explains the provider mvpn receives control routes but does not deliver customer stream data, not the route never appears despite an active local igmpv2 membership. This incident is better attributed to source-specific join signaling requires igmpv3 or supported source filters.

D:

That explanation fits another condition: Packets are dropped by reverse-path-forwarding checks. The evidence here is The route never appears despite an active local IGMPv2 membership. Its closer root cause is Source-specific join signaling requires IGMPv3 or supported source filters.

Question 472

An IPTV receiver joins an SSM multicast channel. Observed: The route never appears despite an active local IGMPv2 membership. Which change-acceptance control is most relevant to preventing this exact failure?

  1. For each approved related change, verify that customer receiver receives packets with correct isolated MVPN forwarding. Flag recurrence if the provider MVPN receives control routes but does not deliver customer stream data.
  2. For each approved related change, verify that the receiver establishes an (S,G) state for the intended channel. Flag recurrence if the route never appears despite an active local IGMPv2 membership.
  3. For each approved related change, verify that both old ASM and new SSM groups build trees appropriate to their mode. Flag recurrence if a legacy ASM group is interpreted as source-specific and cannot use its RP.
  4. 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.

Explanation

Correct Answer

B:

The control is specific to the initial failure. It requires the result The receiver establishes an (S,G) state for the intended channel. and treats The route never appears despite an active local IGMPv2 membership. as a failure signal. The causal concern is source-specific join signaling requires igmpv3 or supported source filters.

Incorrect Answers

A:

The proposed control is tied to multicast vpn service control signaling and transport tunnel mapping do not match, typically observed when the provider MVPN receives control routes but does not deliver customer stream data. Here the target is source-specific join signaling requires igmpv3 or supported source filters; monitor the receiver establishes an (S,G) state for the intended channel.

C:

This gate monitors a different failure, a legacy asm group is interpreted as source-specific and cannot use its rp. It would not detect the current problem: The route never appears despite an active local IGMPv2 membership. The appropriate check requires the receiver establishes an (S,G) state for the intended channel.

D:

It is valid for another service scenario but checks packets are dropped by reverse-path-forwarding checks. This case instead needs a gate for the route never appears despite an active local igmpv2 membership and evidence that the receiver establishes an (S,G) state for the intended channel.

Question 473

A PIM router receives multicast packets from a new source interface. Observed: Packets are dropped by reverse-path-forwarding checks. What should the routing engineer change first to address this particular symptom?

  1. Configure supported Anycast RP or redundant RP discovery with proper synchronization.
  2. Repair source RPF reachability and ingress interface alignment.
  3. Complete supported RP synchronization between Anycast RP nodes.
  4. Narrow IGMP or multicast policy to permit authorized group membership.

Explanation

Correct Answer

B:

The decisive evidence is that Packets are dropped by reverse-path-forwarding checks. This follows from unicast routing points toward the source through a different incoming interface. The focused remedy is to repair source RPF reachability and ingress interface alignment. Confirm improvement when rPF checks succeed and packets forward along the source tree. Validate on an approved lab or change window before touching production.

Incorrect Answers

A:

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 Packets are dropped by reverse-path-forwarding checks. It instead requires repair source RPF reachability and ingress interface alignment.

C:

The option may be useful when two RP nodes disagree on active source registrations, but that is not the current evidence. Here, packets are dropped by reverse-path-forwarding checks, indicating unicast routing points toward the source through a different incoming interface. The targeted action is Repair source RPF reachability and ingress interface alignment.

D:

This remediates the group filter mistakenly denies the contracted multicast address, normally indicated by A valid service group never creates IGMP membership on the PE. It would leave the observed problem (Packets are dropped by reverse-path-forwarding checks) unresolved. Address it with repair source RPF reachability and ingress interface alignment.

Question 474

A PIM router receives multicast packets from a new source interface. Observed: Packets are dropped by reverse-path-forwarding checks. Which acceptance observation best confirms that the proposed change worked?

  1. Both RPs know registered active sources and either can serve receivers.
  2. Intended groups appear in membership state while prohibited groups remain excluded.
  3. RPF checks succeed and packets forward along the source tree.
  4. Failover retains multicast delivery without stale RP dependency.

Explanation

Correct Answer

C:

This acceptance criterion tests the actual fault. The source evidence was Packets are dropped by reverse-path-forwarding checks. The correction addresses unicast routing points toward the source through a different incoming interface; success requires rPF checks succeed and packets forward along the source tree.

Incorrect Answers

A:

That observation would verify a separate fault involving anycast rp source-information synchronization is incomplete. Its symptom is Two RP nodes disagree on active source registrations. For this case the actual issue is unicast routing points toward the source through a different incoming interface, and the relevant success signal is RPF checks succeed and packets forward along the source tree.

B:

This result is useful in another case with evidence A valid service group never creates IGMP membership on the PE. It does not test recovery from packets are dropped by reverse-path-forwarding checks. Check instead whether rPF checks succeed and packets forward along the source tree.

D:

It confirms an unrelated service correction: RP redundancy and discovery were not implemented for the ASM service. The present case reports Packets are dropped by reverse-path-forwarding checks. Its completion test is RPF checks succeed and packets forward along the source tree.

Question 475

A PIM router receives multicast packets from a new source interface. Observed: Packets are dropped by reverse-path-forwarding checks. What is the most likely source of the observed routing or service failure?

  1. The group filter mistakenly denies the contracted multicast address.
  2. Anycast RP source-information synchronization is incomplete.
  3. Unicast routing points toward the source through a different incoming interface.
  4. RP redundancy and discovery were not implemented for the ASM service.

Explanation

Correct Answer

C:

This explanation is the closest match to the observed symptom: Packets are dropped by reverse-path-forwarding checks. The specified root issue is Unicast routing points toward the source through a different incoming interface. Repair it through repair source RPF reachability and ingress interface alignment, then check rPF checks succeed and packets forward along the source tree.

Incorrect Answers

A:

That explanation fits another condition: A valid service group never creates IGMP membership on the PE. The evidence here is Packets are dropped by reverse-path-forwarding checks. Its closer root cause is Unicast routing points toward the source through a different incoming interface.

B:

The stated cause is possible elsewhere but explains two rp nodes disagree on active source registrations, not packets are dropped by reverse-path-forwarding checks. This incident is better attributed to unicast routing points toward the source through a different incoming interface.

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: Packets are dropped by reverse-path-forwarding checks. The likely cause is Unicast routing points toward the source through a different incoming interface.

Question 476

A PIM router receives multicast packets from a new source interface. Observed: Packets are dropped by reverse-path-forwarding checks. What operational check best guards against this problem returning?

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

Explanation

Correct Answer

C:

This control asks for the same recovery evidence (RPF checks succeed and packets forward along the source tree) and flags recurrence of the same failure (Packets are dropped by reverse-path-forwarding checks). It targets the underlying issue, unicast routing points toward the source through a different incoming interface, rather than a different service problem. The exact cadence must be agreed with operations.

Incorrect Answers

A:

The proposed control is tied to anycast rp source-information synchronization is incomplete, typically observed when two RP nodes disagree on active source registrations. Here the target is unicast routing points toward the source through a different incoming interface; monitor rPF checks succeed and packets forward along the source tree.

B:

It is valid for another service scenario but checks a valid service group never creates igmp membership on the pe. This case instead needs a gate for packets are dropped by reverse-path-forwarding checks and evidence that rPF checks succeed and packets forward along the source tree.

D:

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: Packets are dropped by reverse-path-forwarding checks. The appropriate check requires rPF checks succeed and packets forward along the source tree.

Question 477

A PIM sparse-mode domain has two possible rendezvous points. Observed: One RP fails but receivers stay joined to a dead shared tree. Which targeted remediation is most appropriate for the observed condition?

  1. Trace upstream Join messages and restore PIM neighbor and multicast routing state.
  2. Set compatible IGMPv3 processing and verify source filters.
  3. Configure supported Anycast RP or redundant RP discovery with proper synchronization.
  4. Set the intended switch-to-source-tree behavior and verify RPF route selection.

Explanation

Correct Answer

C:

This fix addresses the stated cause rather than an unrelated protocol. The reported symptom—One RP fails but receivers stay joined to a dead shared tree—is consistent with rp redundancy and discovery were not implemented for the asm service. Use the specified correction, then verify: Failover retains multicast delivery without stale RP dependency. Preserve existing policy and tenant isolation.

Incorrect Answers

A:

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, one RP fails but receivers stay joined to a dead shared tree, indicating rp redundancy and discovery were not implemented for the asm service. The targeted action is Configure supported Anycast RP or redundant RP discovery with proper synchronization.

B:

This remediates local igmp version is fixed at an earlier membership model, normally indicated by IGMPv3 receivers cannot express source include lists to the router. It would leave the observed problem (One RP fails but receivers stay joined to a dead shared tree) unresolved. Address it with configure supported Anycast RP or redundant RP discovery with proper synchronization.

D:

This change belongs to a different IP Multicast issue: Shared-tree traffic continues after the receiver requests shortest-path switchover. That issue involves spt threshold or pim source-tree behavior is not aligned to the service policy. The current symptom is One RP fails but receivers stay joined to a dead shared tree. It instead requires configure supported Anycast RP or redundant RP discovery with proper synchronization.

Question 478

A PIM sparse-mode domain has two possible rendezvous points. Observed: One RP fails but receivers stay joined to a dead shared tree. What evidence would validate recovery from this precise failure mode?

  1. The interface records expected source-specific membership state.
  2. Failover retains multicast delivery without stale RP dependency.
  3. (S,G) forwarding follows the expected shortest-path tree after switchover.
  4. The multicast forwarding table lists the correct outgoing interfaces.

Explanation

Correct Answer

B:

The intended result is Failover retains multicast delivery without stale RP dependency. It specifically verifies recovery from rp redundancy and discovery were not implemented for the asm service, which produced the original symptom: One RP fails but receivers stay joined to a dead shared tree. It is stronger evidence than a generic interface-up indicator.

Incorrect Answers

A:

This result is useful in another case with evidence IGMPv3 receivers cannot express source include lists to the router. It does not test recovery from one rp fails but receivers stay joined to a dead shared tree. Check instead whether failover retains multicast delivery without stale RP dependency.

C:

It confirms an unrelated service correction: SPT threshold or PIM source-tree behavior is not aligned to the service policy. The present case reports One RP fails but receivers stay joined to a dead shared tree. Its completion test is Failover retains multicast delivery without stale RP dependency.

D:

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 rp redundancy and discovery were not implemented for the asm service, and the relevant success signal is Failover retains multicast delivery without stale RP dependency.

Question 479

A PIM sparse-mode domain has two possible rendezvous points. Observed: One RP fails but receivers stay joined to a dead shared tree. What underlying protocol or service configuration problem best explains the evidence?

  1. Local IGMP version is fixed at an earlier membership model.
  2. The group join state does not propagate through the intended PIM path.
  3. SPT threshold or PIM source-tree behavior is not aligned to the service policy.
  4. RP redundancy and discovery were not implemented for the ASM service.

Explanation

Correct Answer

D:

Because one RP fails but receivers stay joined to a dead shared tree, the likely cause is rp redundancy and discovery were not implemented for the asm service. It is testable: Configure supported Anycast RP or redundant RP discovery with proper synchronization. Expected follow-up: Failover retains multicast delivery without stale RP dependency.

Incorrect Answers

A:

That explanation fits another condition: IGMPv3 receivers cannot express source include lists to the router. The evidence here is One RP fails but receivers stay joined to a dead shared tree. Its closer root cause is RP redundancy and discovery were not implemented for the ASM service.

B:

The stated cause is possible elsewhere but explains edge receivers are active but the intermediate router has no outgoing interface list, not one rp fails but receivers stay joined to a dead shared tree. This incident is better attributed to rp redundancy and discovery were not implemented for the asm service.

C:

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

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.

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