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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 51

Question 500

An ISP migrates IPTV channels from ASM to SSM. Observed: Receiver packets still target a shared-tree RP that no longer has active mapping. What operational check best guards against this problem returning?

  1. For each approved related change, verify that the (S,G) tree becomes active without RP dependency for SSM addresses. Flag recurrence if receiver packets still target a shared-tree RP that no longer has active mapping.
  2. For each approved related change, verify that pIM neighbors remain Up and multicast joins propagate. Flag recurrence if pIM Hellos traverse a link whose multicast control traffic is filtered.
  3. For each approved related change, verify that receiver joins build a shared tree and receive source packets. Flag recurrence if sources transmit packets but receivers see none until a static join is added.
  4. 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.

Explanation

Correct Answer

A:

This control asks for the same recovery evidence (The (S,G) tree becomes active without RP dependency for SSM addresses) and flags recurrence of the same failure (Receiver packets still target a shared-tree RP that no longer has active mapping). It targets the underlying issue, legacy any-source join configuration remains after the ssm group move, rather than a different service problem. The exact cadence must be agreed with operations.

Incorrect Answers

B:

The proposed control is tied to a control-plane filter blocks required pim packets on the transit segment, typically observed when pIM Hellos traverse a link whose multicast control traffic is filtered. Here the target is legacy any-source join configuration remains after the ssm group move; monitor the (S,G) tree becomes active without RP dependency for SSM addresses.

C:

It is valid for another service scenario but checks sources transmit packets but receivers see none until a static join is added. This case instead needs a gate for receiver packets still target a shared-tree rp that no longer has active mapping and evidence that the (S,G) tree becomes active without RP dependency for SSM addresses.

D:

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: Receiver packets still target a shared-tree RP that no longer has active mapping. The appropriate check requires the (S,G) tree becomes active without RP dependency for SSM addresses.

Question 501

A provider has an incorrectly broad SSM address range. Observed: A legacy ASM group is interpreted as source-specific and cannot use its RP. Which targeted remediation is most appropriate for the observed condition?

  1. Separate SSM and ASM address ranges in the multicast configuration.
  2. Enable IGMPv3 and configure a matching source and group membership.
  3. Align supported MVPN provider tunnel and customer multicast routing design.
  4. Complete supported RP synchronization between Anycast RP nodes.

Explanation

Correct Answer

A:

This fix addresses the stated cause rather than an unrelated protocol. The reported symptom—A legacy ASM group is interpreted as source-specific and cannot use its RP—is consistent with ssm group-range classification overlaps with the existing asm service. Use the specified correction, then verify: Both old ASM and new SSM groups build trees appropriate to their mode. Preserve existing policy and tenant isolation.

Incorrect Answers

B:

This change belongs to a different IP Multicast issue: The route never appears despite an active local IGMPv2 membership. That issue involves source-specific join signaling requires igmpv3 or supported source filters. The current symptom is A legacy ASM group is interpreted as source-specific and cannot use its RP. It instead requires separate SSM and ASM address ranges in the multicast configuration.

C:

This remediates multicast vpn service control signaling and transport tunnel mapping do not match, normally indicated by The provider MVPN receives control routes but does not deliver customer stream data. It would leave the observed problem (A legacy ASM group is interpreted as source-specific and cannot use its RP) unresolved. Address it with separate SSM and ASM address ranges in the multicast configuration.

D:

The option may be useful when two RP nodes disagree on active source registrations, but that is not the current evidence. Here, a legacy ASM group is interpreted as source-specific and cannot use its RP, indicating ssm group-range classification overlaps with the existing asm service. The targeted action is Separate SSM and ASM address ranges in the multicast configuration.

Question 502

A provider has an incorrectly broad SSM address range. Observed: A legacy ASM group is interpreted as source-specific and cannot use its RP. What evidence would validate recovery from this precise failure mode?

  1. Both RPs know registered active sources and either can serve receivers.
  2. Both old ASM and new SSM groups build trees appropriate to their mode.
  3. The receiver establishes an (S,G) state for the intended channel.
  4. Customer receiver receives packets with correct isolated MVPN forwarding.

Explanation

Correct Answer

B:

The intended result is Both old ASM and new SSM groups build trees appropriate to their mode. It specifically verifies recovery from ssm group-range classification overlaps with the existing asm service, which produced the original symptom: A legacy ASM group is interpreted as source-specific and cannot use its RP. It is stronger evidence than a generic interface-up indicator.

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 ssm group-range classification overlaps with the existing asm service, and the relevant success signal is Both old ASM and new SSM groups build trees appropriate to their mode.

C:

It confirms an unrelated service correction: Source-specific join signaling requires IGMPv3 or supported source filters. The present case reports A legacy ASM group is interpreted as source-specific and cannot use its RP. Its completion test is Both old ASM and new SSM groups build trees appropriate to their mode.

D:

This result is useful in another case with evidence The provider MVPN receives control routes but does not deliver customer stream data. It does not test recovery from a legacy asm group is interpreted as source-specific and cannot use its rp. Check instead whether both old ASM and new SSM groups build trees appropriate to their mode.

Question 503

A provider has an incorrectly broad SSM address range. Observed: A legacy ASM group is interpreted as source-specific and cannot use its RP. What underlying protocol or service configuration problem best explains the evidence?

  1. Anycast RP source-information synchronization is incomplete.
  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. Source-specific join signaling requires IGMPv3 or supported source filters.

Explanation

Correct Answer

B:

Because a legacy ASM group is interpreted as source-specific and cannot use its RP, the likely cause is ssm group-range classification overlaps with the existing asm service. It is testable: Separate SSM and ASM address ranges in the multicast configuration. Expected follow-up: Both old ASM and new SSM groups build trees appropriate to their mode.

Incorrect Answers

A:

The stated cause is possible elsewhere but explains two rp nodes disagree on active source registrations, not a legacy asm group is interpreted as source-specific and cannot use its rp. This incident is better attributed to ssm group-range classification overlaps with the existing asm service.

C:

That explanation fits another condition: The provider MVPN receives control routes but does not deliver customer stream data. The evidence here is A legacy ASM group is interpreted as source-specific and cannot use its RP. Its closer root cause is SSM group-range classification overlaps with the existing ASM service.

D:

Source-specific join signaling requires IGMPv3 or supported source filters. would normally be accompanied by the route never appears despite an active local igmpv2 membership. The observed symptom is different: A legacy ASM group is interpreted as source-specific and cannot use its RP. The likely cause is SSM group-range classification overlaps with the existing ASM service.

Question 504

A provider has an incorrectly broad SSM address range. Observed: A legacy ASM group is interpreted as source-specific and cannot use its RP. Which ongoing validation gate would best detect a recurrence of this problem?

  1. 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.
  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 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.
  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 both old ASM and new SSM groups build trees appropriate to their mode and alerts when a legacy ASM group is interpreted as source-specific and cannot use its RP. This directly checks the technical weakness: SSM group-range classification overlaps with the existing ASM service. The gate is derived from the fictional incident and is not an independent Juniper engineer signoff.

Incorrect Answers

B:

This gate monitors a different failure, the route never appears despite an active local igmpv2 membership. It would not detect the current problem: A legacy ASM group is interpreted as source-specific and cannot use its RP. The appropriate check requires both old ASM and new SSM groups build trees appropriate to their mode.

C:

It is valid for another service scenario but checks the provider mvpn receives control routes but does not deliver customer stream data. This case instead needs a gate for a legacy asm group is interpreted as source-specific and cannot use its rp and evidence that both old ASM and new SSM groups build trees appropriate to their mode.

D:

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 ssm group-range classification overlaps with the existing asm service; monitor both old ASM and new SSM groups build trees appropriate to their mode.

Question 505

A multi-router multicast domain uses Anycast RP addresses. Observed: Two RP nodes disagree on active source registrations. Which change most directly corrects the failure while respecting the existing service boundary?

  1. Set compatible IGMPv3 processing and verify source filters.
  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

C:

The observed condition is Two RP nodes disagree on active source registrations. That indicates anycast rp source-information synchronization is incomplete. Applying the proposed remedy directly changes that condition. A concrete completion check is: Both RPs know registered active sources and either can serve receivers.

Incorrect Answers

A:

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 (Two RP nodes disagree on active source registrations) unresolved. Address it with complete supported RP synchronization between Anycast RP nodes.

B:

The option may be useful when packets are dropped by reverse-path-forwarding checks, but that is not the current evidence. Here, two RP nodes disagree on active source registrations, indicating anycast rp source-information synchronization is incomplete. The targeted action is Complete supported RP synchronization between Anycast RP nodes.

D:

This change belongs to a different IP Multicast issue: A valid service group never creates IGMP membership on the PE. That issue involves the group filter mistakenly denies the contracted multicast address. The current symptom is Two RP nodes disagree on active source registrations. It instead requires complete supported RP synchronization between Anycast RP nodes.

Question 506

A multi-router multicast domain uses Anycast RP addresses. Observed: Two RP nodes disagree on active source registrations. After the correction, which result would most convincingly show that this fault is resolved?

  1. The interface records expected source-specific membership state.
  2. RPF checks succeed and packets forward along the source tree.
  3. Both RPs know registered active sources and either can serve receivers.
  4. Intended groups appear in membership state while prohibited groups remain excluded.

Explanation

Correct Answer

C:

After complete supported RP synchronization between Anycast RP nodes, inspect whether both RPs know registered active sources and either can serve receivers. This closes the loop between the reported observation (Two RP nodes disagree on active source registrations) and the underlying issue (Anycast RP source-information synchronization is incomplete).

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 two rp nodes disagree on active source registrations. Check instead whether both RPs know registered active sources and either can serve receivers.

B:

That observation would verify a separate fault involving unicast routing points toward the source through a different incoming interface. Its symptom is Packets are dropped by reverse-path-forwarding checks. For this case the actual issue is anycast rp source-information synchronization is incomplete, and the relevant success signal is Both RPs know registered active sources and either can serve receivers.

D:

It confirms an unrelated service correction: The group filter mistakenly denies the contracted multicast address. The present case reports Two RP nodes disagree on active source registrations. Its completion test is Both RPs know registered active sources and either can serve receivers.

Question 507

A multi-router multicast domain uses Anycast RP addresses. Observed: Two RP nodes disagree on active source registrations. Which root cause is most consistent with this symptom?

  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. Local IGMP version is fixed at an earlier membership model.

Explanation

Correct Answer

B:

The reported evidence—Two RP nodes disagree on active source registrations—supports anycast rp source-information synchronization is incomplete. The appropriate intervention is to complete supported RP synchronization between Anycast RP nodes, with confirmation from both RPs know registered active sources and either can serve receivers. Other causes require actual device-state verification.

Incorrect Answers

A:

The group filter mistakenly denies the contracted multicast address. would normally be accompanied by a valid service group never creates igmp membership on the pe. The observed symptom is different: Two RP nodes disagree on active source registrations. The likely cause is Anycast RP source-information synchronization is incomplete.

C:

The stated cause is possible elsewhere but explains packets are dropped by reverse-path-forwarding checks, not two rp nodes disagree on active source registrations. This incident is better attributed to anycast rp source-information synchronization is incomplete.

D:

That explanation fits another condition: IGMPv3 receivers cannot express source include lists to the router. The evidence here is Two RP nodes disagree on active source registrations. Its closer root cause is Anycast RP source-information synchronization is incomplete.

Question 508

A multi-router multicast domain uses Anycast RP addresses. Observed: Two RP nodes disagree on active source registrations. Which change-acceptance control is most relevant to preventing this exact failure?

  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 the interface records expected source-specific membership state. Flag recurrence if iGMPv3 receivers cannot express source include lists to the router.
  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 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.

Explanation

Correct Answer

A:

The control is specific to the initial failure. It requires the result Both RPs know registered active sources and either can serve receivers. and treats Two RP nodes disagree on active source registrations. as a failure signal. The causal concern is anycast rp source-information synchronization is incomplete.

Incorrect Answers

B:

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 two rp nodes disagree on active source registrations and evidence that both RPs know registered active sources and either can serve receivers.

C:

The proposed control is tied to unicast routing points toward the source through a different incoming interface, typically observed when packets are dropped by reverse-path-forwarding checks. Here the target is anycast rp source-information synchronization is incomplete; monitor both RPs know registered active sources and either can serve receivers.

D:

This gate monitors a different failure, a valid service group never creates igmp membership on the pe. It would not detect the current problem: Two RP nodes disagree on active source registrations. The appropriate check requires both RPs know registered active sources and either can serve receivers.

Question 509

An IGMP service uses the wrong version on an access-router interface. Observed: IGMPv3 receivers cannot express source include lists to the router. 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. Set the intended switch-to-source-tree behavior and verify RPF route selection.
  3. Restore consistent routed reachability to the RP and PIM transit adjacencies.
  4. Set compatible IGMPv3 processing and verify source filters.

Explanation

Correct Answer

D:

The decisive evidence is that IGMPv3 receivers cannot express source include lists to the router. This follows from local igmp version is fixed at an earlier membership model. The focused remedy is to set compatible IGMPv3 processing and verify source filters. Confirm improvement when the interface records expected source-specific membership state. Validate on an approved lab or change window before touching production.

Incorrect Answers

A:

This remediates rp redundancy and discovery were not implemented for the asm service, normally indicated by One RP fails but receivers stay joined to a dead shared tree. It would leave the observed problem (IGMPv3 receivers cannot express source include lists to the router) unresolved. Address it with set compatible IGMPv3 processing and verify source filters.

B:

The option may be useful when shared-tree traffic continues after the receiver requests shortest-path switchover, but that is not the current evidence. Here, iGMPv3 receivers cannot express source include lists to the router, indicating local igmp version is fixed at an earlier membership model. The targeted action is Set compatible IGMPv3 processing and verify source filters.

C:

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 IGMPv3 receivers cannot express source include lists to the router. It instead requires set compatible IGMPv3 processing and verify source filters.

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.

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