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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 54

Question 530

An access PE sees repeated PIM neighbor resets on a multicast interface. Observed: PIM Hellos traverse a link whose multicast control traffic is filtered. After the correction, which result would most convincingly show that this fault is resolved?

  1. PIM neighbors remain Up and multicast joins propagate.
  2. The (S,G) tree becomes active without RP dependency for SSM addresses.
  3. Customer receiver receives packets with correct isolated MVPN forwarding.
  4. Receiver joins build a shared tree and receive source packets.

Explanation

Correct Answer

A:

After permit authorized PIM neighbor control traffic without opening unrelated multicast flood, inspect whether pIM neighbors remain Up and multicast joins propagate. This closes the loop between the reported observation (PIM Hellos traverse a link whose multicast control traffic is filtered) and the underlying issue (A control-plane filter blocks required PIM packets on the transit segment).

Incorrect Answers

B:

That observation would verify a separate fault involving legacy any-source join configuration remains after the ssm group move. Its symptom is Receiver packets still target a shared-tree RP that no longer has active mapping. For this case the actual issue is a control-plane filter blocks required pim packets on the transit segment, and the relevant success signal is PIM neighbors remain Up and multicast joins propagate.

C:

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 pim hellos traverse a link whose multicast control traffic is filtered. Check instead whether pIM neighbors remain Up and multicast joins propagate.

D:

It confirms an unrelated service correction: The rendezvous point address is missing or unreachable for the ASM group. The present case reports PIM Hellos traverse a link whose multicast control traffic is filtered. Its completion test is PIM neighbors remain Up and multicast joins propagate.

Question 531

An access PE sees repeated PIM neighbor resets on a multicast interface. Observed: PIM Hellos traverse a link whose multicast control traffic is filtered. Which root cause is most consistent with this symptom?

  1. Legacy any-source join configuration remains after the SSM group move.
  2. Multicast VPN service control signaling and transport tunnel mapping do not match.
  3. A control-plane filter blocks required PIM packets on the transit segment.
  4. The rendezvous point address is missing or unreachable for the ASM group.

Explanation

Correct Answer

C:

The reported evidence—PIM Hellos traverse a link whose multicast control traffic is filtered—supports a control-plane filter blocks required pim packets on the transit segment. The appropriate intervention is to permit authorized PIM neighbor control traffic without opening unrelated multicast flood, with confirmation from pIM neighbors remain Up and multicast joins propagate. Other causes require actual device-state verification.

Incorrect Answers

A:

The stated cause is possible elsewhere but explains receiver packets still target a shared-tree rp that no longer has active mapping, not pim hellos traverse a link whose multicast control traffic is filtered. This incident is better attributed to a control-plane filter blocks required pim packets on the transit segment.

B:

That explanation fits another condition: The provider MVPN receives control routes but does not deliver customer stream data. The evidence here is PIM Hellos traverse a link whose multicast control traffic is filtered. Its closer root cause is A control-plane filter blocks required PIM packets on the transit segment.

D:

The rendezvous point address is missing or unreachable for the ASM group. would normally be accompanied by sources transmit packets but receivers see none until a static join is added. The observed symptom is different: PIM Hellos traverse a link whose multicast control traffic is filtered. The likely cause is A control-plane filter blocks required PIM packets on the transit segment.

Question 532

An access PE sees repeated PIM neighbor resets on a multicast interface. Observed: PIM Hellos traverse a link whose multicast control traffic is filtered. Which change-acceptance control is most relevant to preventing this exact failure?

  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 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.
  3. 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.
  4. 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.

Explanation

Correct Answer

C:

The control is specific to the initial failure. It requires the result PIM neighbors remain Up and multicast joins propagate. and treats PIM Hellos traverse a link whose multicast control traffic is filtered. as a failure signal. The causal concern is a control-plane filter blocks required pim packets on the transit segment.

Incorrect Answers

A:

The proposed control is tied to legacy any-source join configuration remains after the ssm group move, typically observed when receiver packets still target a shared-tree RP that no longer has active mapping. Here the target is a control-plane filter blocks required pim packets on the transit segment; monitor pIM neighbors remain Up and multicast joins propagate.

B:

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 pim hellos traverse a link whose multicast control traffic is filtered and evidence that pIM neighbors remain Up and multicast joins propagate.

D:

This gate monitors a different failure, sources transmit packets but receivers see none until a static join is added. It would not detect the current problem: PIM Hellos traverse a link whose multicast control traffic is filtered. The appropriate check requires pIM neighbors remain Up and multicast joins propagate.

Question 533

A customer video service uses PIM sparse mode across an L3VPN. Observed: The provider MVPN receives control routes but does not deliver customer stream data. What should the routing engineer change first to address this particular symptom?

  1. Narrow IGMP or multicast policy to permit authorized group membership.
  2. Separate SSM and ASM address ranges in the multicast configuration.
  3. Enable IGMPv3 and configure a matching source and group membership.
  4. Align supported MVPN provider tunnel and customer multicast routing design.

Explanation

Correct Answer

D:

The decisive evidence is that The provider MVPN receives control routes but does not deliver customer stream data. This follows from multicast vpn service control signaling and transport tunnel mapping do not match. The focused remedy is to align supported MVPN provider tunnel and customer multicast routing design. Confirm improvement when customer receiver receives packets with correct isolated MVPN forwarding. Validate on an approved lab or change window before touching production.

Incorrect Answers

A:

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 The provider MVPN receives control routes but does not deliver customer stream data. It instead requires align supported MVPN provider tunnel and customer multicast routing design.

B:

This remediates ssm group-range classification overlaps with the existing asm service, normally indicated by A legacy ASM group is interpreted as source-specific and cannot use its RP. It would leave the observed problem (The provider MVPN receives control routes but does not deliver customer stream data) unresolved. Address it with align supported MVPN provider tunnel and customer multicast routing design.

C:

The option may be useful when the route never appears despite an active local IGMPv2 membership, but that is not the current evidence. Here, the provider MVPN receives control routes but does not deliver customer stream data, indicating multicast vpn service control signaling and transport tunnel mapping do not match. The targeted action is Align supported MVPN provider tunnel and customer multicast routing design.

Question 534

A customer video service uses PIM sparse mode across an L3VPN. Observed: The provider MVPN receives control routes but does not deliver customer stream data. Which acceptance observation best confirms that the proposed change worked?

  1. The receiver establishes an (S,G) state for the intended channel.
  2. Intended groups appear in membership state while prohibited groups remain excluded.
  3. Customer receiver receives packets with correct isolated MVPN forwarding.
  4. Both old ASM and new SSM groups build trees appropriate to their mode.

Explanation

Correct Answer

C:

This acceptance criterion tests the actual fault. The source evidence was The provider MVPN receives control routes but does not deliver customer stream data. The correction addresses multicast vpn service control signaling and transport tunnel mapping do not match; success requires customer receiver receives packets with correct isolated MVPN forwarding.

Incorrect Answers

A:

That observation would verify a separate fault involving source-specific join signaling requires igmpv3 or supported source filters. Its symptom is The route never appears despite an active local IGMPv2 membership. For this case the actual issue is multicast vpn service control signaling and transport tunnel mapping do not match, and the relevant success signal is Customer receiver receives packets with correct isolated MVPN forwarding.

B:

It confirms an unrelated service correction: The group filter mistakenly denies the contracted multicast address. The present case reports The provider MVPN receives control routes but does not deliver customer stream data. Its completion test is Customer receiver receives packets with correct isolated MVPN forwarding.

D:

This result is useful in another case with evidence A legacy ASM group is interpreted as source-specific and cannot use its RP. It does not test recovery from the provider mvpn receives control routes but does not deliver customer stream data. Check instead whether customer receiver receives packets with correct isolated MVPN forwarding.

Question 535

A customer video service uses PIM sparse mode across an L3VPN. Observed: The provider MVPN receives control routes but does not deliver customer stream data. What is the most likely source of the observed routing or service failure?

  1. Multicast VPN service control signaling and transport tunnel mapping do not match.
  2. SSM group-range classification overlaps with the existing ASM service.
  3. The group filter mistakenly denies the contracted multicast address.
  4. Source-specific join signaling requires IGMPv3 or supported source filters.

Explanation

Correct Answer

A:

This explanation is the closest match to the observed symptom: The provider MVPN receives control routes but does not deliver customer stream data. The specified root issue is Multicast VPN service control signaling and transport tunnel mapping do not match. Repair it through align supported MVPN provider tunnel and customer multicast routing design, then check customer receiver receives packets with correct isolated MVPN forwarding.

Incorrect Answers

B:

That explanation fits another condition: A legacy ASM group is interpreted as source-specific and cannot use its RP. The evidence here is The provider MVPN receives control routes but does not deliver customer stream data. Its closer root cause is Multicast VPN service control signaling and transport tunnel mapping do not match.

C:

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: The provider MVPN receives control routes but does not deliver customer stream data. The likely cause is Multicast VPN service control signaling and transport tunnel mapping do not match.

D:

The stated cause is possible elsewhere but explains the route never appears despite an active local igmpv2 membership, not the provider mvpn receives control routes but does not deliver customer stream data. This incident is better attributed to multicast vpn service control signaling and transport tunnel mapping do not match.

Question 536

A customer video service uses PIM sparse mode across an L3VPN. Observed: The provider MVPN receives control routes but does not deliver customer stream data. What operational check best guards against this problem returning?

  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 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 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

C:

This control asks for the same recovery evidence (Customer receiver receives packets with correct isolated MVPN forwarding) and flags recurrence of the same failure (The provider MVPN receives control routes but does not deliver customer stream data). It targets the underlying issue, multicast vpn service control signaling and transport tunnel mapping do not match, rather than a different service problem. The exact cadence must be agreed with operations.

Incorrect Answers

A:

This gate monitors a different failure, a valid service group never creates igmp membership on the pe. It would not detect the current problem: The provider MVPN receives control routes but does not deliver customer stream data. The appropriate check requires customer receiver receives packets with correct isolated MVPN forwarding.

B:

The proposed control is tied to source-specific join signaling requires igmpv3 or supported source filters, typically observed when the route never appears despite an active local IGMPv2 membership. Here the target is multicast vpn service control signaling and transport tunnel mapping do not match; monitor customer receiver receives packets with correct isolated MVPN forwarding.

D:

It is valid for another service scenario but checks a legacy asm group is interpreted as source-specific and cannot use its rp. This case instead needs a gate for the provider mvpn receives control routes but does not deliver customer stream data and evidence that customer receiver receives packets with correct isolated MVPN forwarding.

Question 537

A provider configures a multicast group filter at access ingress. Observed: A valid service group never creates IGMP membership on the PE. Which targeted remediation is most appropriate for the observed condition?

  1. Narrow IGMP or multicast policy to permit authorized group membership.
  2. Set the intended switch-to-source-tree behavior and verify RPF route selection.
  3. Repair source RPF reachability and ingress interface alignment.
  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 valid service group never creates IGMP membership on the PE—is consistent with the group filter mistakenly denies the contracted multicast address. Use the specified correction, then verify: Intended groups appear in membership state while prohibited groups remain excluded. Preserve existing policy and tenant isolation.

Incorrect Answers

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, a valid service group never creates IGMP membership on the PE, indicating the group filter mistakenly denies the contracted multicast address. The targeted action is Narrow IGMP or multicast policy to permit authorized group membership.

C:

This remediates unicast routing points toward the source through a different incoming interface, normally indicated by Packets are dropped by reverse-path-forwarding checks. It would leave the observed problem (A valid service group never creates IGMP membership on the PE) unresolved. Address it with narrow IGMP or multicast policy to permit authorized group membership.

D:

This change belongs to a different IP Multicast issue: Two RP nodes disagree on active source registrations. That issue involves anycast rp source-information synchronization is incomplete. The current symptom is A valid service group never creates IGMP membership on the PE. It instead requires narrow IGMP or multicast policy to permit authorized group membership.

Question 538

A provider configures a multicast group filter at access ingress. Observed: A valid service group never creates IGMP membership on the PE. What evidence would validate recovery from this precise failure mode?

  1. Both RPs know registered active sources and either can serve receivers.
  2. (S,G) forwarding follows the expected shortest-path tree after switchover.
  3. RPF checks succeed and packets forward along the source tree.
  4. Intended groups appear in membership state while prohibited groups remain excluded.

Explanation

Correct Answer

D:

The intended result is Intended groups appear in membership state while prohibited groups remain excluded. It specifically verifies recovery from the group filter mistakenly denies the contracted multicast address, which produced the original symptom: A valid service group never creates IGMP membership on the PE. It is stronger evidence than a generic interface-up indicator.

Incorrect Answers

A:

It confirms an unrelated service correction: Anycast RP source-information synchronization is incomplete. The present case reports A valid service group never creates IGMP membership on the PE. Its completion test is Intended groups appear in membership state while prohibited groups remain excluded.

B:

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 the group filter mistakenly denies the contracted multicast address, and the relevant success signal is Intended groups appear in membership state while prohibited groups remain excluded.

C:

This result is useful in another case with evidence Packets are dropped by reverse-path-forwarding checks. It does not test recovery from a valid service group never creates igmp membership on the pe. Check instead whether intended groups appear in membership state while prohibited groups remain excluded.

Question 539

A provider configures a multicast group filter at access ingress. Observed: A valid service group never creates IGMP membership on the PE. What underlying protocol or service configuration problem best explains the evidence?

  1. SPT threshold or PIM source-tree behavior is not aligned to the service policy.
  2. The group filter mistakenly denies the contracted multicast address.
  3. Anycast RP source-information synchronization is incomplete.
  4. Unicast routing points toward the source through a different incoming interface.

Explanation

Correct Answer

B:

Because a valid service group never creates IGMP membership on the PE, the likely cause is the group filter mistakenly denies the contracted multicast address. It is testable: Narrow IGMP or multicast policy to permit authorized group membership. Expected follow-up: Intended groups appear in membership state while prohibited groups remain excluded.

Incorrect Answers

A:

The stated cause is possible elsewhere but explains shared-tree traffic continues after the receiver requests shortest-path switchover, not a valid service group never creates igmp membership on the pe. This incident is better attributed to the group filter mistakenly denies the contracted multicast address.

C:

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

D:

That explanation fits another condition: Packets are dropped by reverse-path-forwarding checks. The evidence here is A valid service group never creates IGMP membership on the PE. Its closer root cause is The group filter mistakenly denies the contracted multicast address.

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.

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