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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 50

Question 490

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

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

Explanation

Correct Answer

C:

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

Incorrect Answers

A:

This result is useful in another case with evidence One receiver never sees the stream although the other is healthy. It does not test recovery from the upstream pe never adds the receiver interface to its forwarding state. Check instead whether the PE maps the local membership into forwarding toward the receiver.

B:

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

D:

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

Question 491

An access switch reports valid IGMP membership for a pay-TV channel. Observed: The upstream PE never adds the receiver interface to its forwarding state. What underlying protocol or service configuration problem best explains the evidence?

  1. IGMP membership reporting or the IGMP-to-PIM boundary is misconfigured.
  2. RPF-specific policy chooses an unintended interface relative to actual source arrival.
  3. The incoming interface differs from the preferred unicast reverse path to the source.
  4. Reverse-path routing to the source differs across area boundaries.

Explanation

Correct Answer

A:

Because the upstream PE never adds the receiver interface to its forwarding state, the likely cause is igmp membership reporting or the igmp-to-pim boundary is misconfigured. It is testable: Check IGMP version and group joins on the access side and PIM on the upstream side. Expected follow-up: The PE maps the local membership into forwarding toward the receiver.

Incorrect Answers

B:

RPF-specific policy chooses an unintended interface relative to actual source arrival. would normally be accompanied by multicast stream briefly loops and then disappears even though source route remains in rib. The observed symptom is different: The upstream PE never adds the receiver interface to its forwarding state. The likely cause is IGMP membership reporting or the IGMP-to-PIM boundary is misconfigured.

C:

The stated cause is possible elsewhere but explains pim rpf discards increase when routing chooses the other uplink, not the upstream pe never adds the receiver interface to its forwarding state. This incident is better attributed to igmp membership reporting or the igmp-to-pim boundary is misconfigured.

D:

That explanation fits another condition: One receiver never sees the stream although the other is healthy. The evidence here is The upstream PE never adds the receiver interface to its forwarding state. Its closer root cause is IGMP membership reporting or the IGMP-to-PIM boundary is misconfigured.

Question 492

An access switch reports valid IGMP membership for a pay-TV channel. Observed: The upstream PE never adds the receiver interface to its forwarding state. Which ongoing validation gate would best detect a recurrence of this problem?

  1. For each approved related change, verify that the RPF interface and incoming packets agree with no continuing loop or drop. Flag recurrence if multicast stream briefly loops and then disappears even though source route remains in RIB.
  2. For each approved related change, verify that the PE maps the local membership into forwarding toward the receiver. Flag recurrence if the upstream PE never adds the receiver interface to its forwarding state.
  3. For each approved related change, verify that both receiver routers pass RPF checks and forward the intended source tree. Flag recurrence if one receiver never sees the stream although the other is healthy.
  4. For each approved related change, verify that rPF counter increments stop and stream continuity returns. Flag recurrence if pIM RPF discards increase when routing chooses the other uplink.

Explanation

Correct Answer

B:

A useful regression gate tests whether the PE maps the local membership into forwarding toward the receiver and alerts when the upstream PE never adds the receiver interface to its forwarding state. This directly checks the technical weakness: IGMP membership reporting or the IGMP-to-PIM boundary is misconfigured. The gate is derived from the fictional incident and is not an independent Juniper engineer signoff.

Incorrect Answers

A:

This gate monitors a different failure, multicast stream briefly loops and then disappears even though source route remains in rib. It would not detect the current problem: The upstream PE never adds the receiver interface to its forwarding state. The appropriate check requires the PE maps the local membership into forwarding toward the receiver.

C:

It is valid for another service scenario but checks one receiver never sees the stream although the other is healthy. This case instead needs a gate for the upstream pe never adds the receiver interface to its forwarding state and evidence that the PE maps the local membership into forwarding toward the receiver.

D:

The proposed control is tied to the incoming interface differs from the preferred unicast reverse path to the source, typically observed when pIM RPF discards increase when routing chooses the other uplink. Here the target is igmp membership reporting or the igmp-to-pim boundary is misconfigured; monitor the PE maps the local membership into forwarding toward the receiver.

Question 493

A multicast source transmits on a VLAN that also has a backup uplink. Observed: PIM RPF discards increase when routing chooses the other uplink. Which change most directly corrects the failure while respecting the existing service boundary?

  1. Synchronize the intended group-to-RP mapping and confirm source registration.
  2. Correct unicast source routing or relocate the source ingress to the expected RPF interface.
  3. Apply tenant-specific group authorization and forwarding-instance separation.
  4. Enable supported SSM group range and source-specific membership throughout the path.

Explanation

Correct Answer

B:

The observed condition is PIM RPF discards increase when routing chooses the other uplink. That indicates the incoming interface differs from the preferred unicast reverse path to the source. Applying the proposed remedy directly changes that condition. A concrete completion check is: RPF counter increments stop and stream continuity returns.

Incorrect Answers

A:

This change belongs to a different IP Multicast issue: Source registers continue to reach the old RP while receivers use the new RP. That issue involves the rp mapping is inconsistent across source and receiver routers. The current symptom is PIM RPF discards increase when routing chooses the other uplink. It instead requires correct unicast source routing or relocate the source ingress to the expected RPF interface.

C:

The option may be useful when one tenant receives another tenant's IPTV stream on a shared access segment, but that is not the current evidence. Here, pIM RPF discards increase when routing chooses the other uplink, indicating the incoming interface differs from the preferred unicast reverse path to the source. The targeted action is Correct unicast source routing or relocate the source ingress to the expected RPF interface.

D:

This remediates legacy any-source join configuration remains after the ssm group move, normally indicated by Receiver packets still target a shared-tree RP that no longer has active mapping. It would leave the observed problem (PIM RPF discards increase when routing chooses the other uplink) unresolved. Address it with correct unicast source routing or relocate the source ingress to the expected RPF interface.

Question 494

A multicast source transmits on a VLAN that also has a backup uplink. Observed: PIM RPF discards increase when routing chooses the other uplink. After the correction, which result would most convincingly show that this fault is resolved?

  1. The (S,G) tree becomes active without RP dependency for SSM addresses.
  2. RPF counter increments stop and stream continuity returns.
  3. Source registration and receiver joins converge on the same live RP.
  4. Receivers obtain only their authorized groups and cross-tenant traffic ceases.

Explanation

Correct Answer

B:

After correct unicast source routing or relocate the source ingress to the expected RPF interface, inspect whether rPF counter increments stop and stream continuity returns. This closes the loop between the reported observation (PIM RPF discards increase when routing chooses the other uplink) and the underlying issue (The incoming interface differs from the preferred unicast reverse path to the source).

Incorrect Answers

A:

This result is useful in another case with evidence Receiver packets still target a shared-tree RP that no longer has active mapping. It does not test recovery from pim rpf discards increase when routing chooses the other uplink. Check instead whether rPF counter increments stop and stream continuity returns.

C:

It confirms an unrelated service correction: The RP mapping is inconsistent across source and receiver routers. The present case reports PIM RPF discards increase when routing chooses the other uplink. Its completion test is RPF counter increments stop and stream continuity returns.

D:

That observation would verify a separate fault involving multicast group isolation and igmp membership controls are not scoped by tenant. Its symptom is One tenant receives another tenant's IPTV stream on a shared access segment. For this case the actual issue is the incoming interface differs from the preferred unicast reverse path to the source, and the relevant success signal is RPF counter increments stop and stream continuity returns.

Question 495

A multicast source transmits on a VLAN that also has a backup uplink. Observed: PIM RPF discards increase when routing chooses the other uplink. Which root cause is most consistent with this symptom?

  1. The incoming interface differs from the preferred unicast reverse path to the source.
  2. The RP mapping is inconsistent across source and receiver routers.
  3. Multicast group isolation and IGMP membership controls are not scoped by tenant.
  4. Legacy any-source join configuration remains after the SSM group move.

Explanation

Correct Answer

A:

The reported evidence—PIM RPF discards increase when routing chooses the other uplink—supports the incoming interface differs from the preferred unicast reverse path to the source. The appropriate intervention is to correct unicast source routing or relocate the source ingress to the expected RPF interface, with confirmation from rPF counter increments stop and stream continuity returns. Other causes require actual device-state verification.

Incorrect Answers

B:

The RP mapping is inconsistent across source and receiver routers. would normally be accompanied by source registers continue to reach the old rp while receivers use the new rp. The observed symptom is different: PIM RPF discards increase when routing chooses the other uplink. The likely cause is The incoming interface differs from the preferred unicast reverse path to the source.

C:

The stated cause is possible elsewhere but explains one tenant receives another tenant's iptv stream on a shared access segment, not pim rpf discards increase when routing chooses the other uplink. This incident is better attributed to the incoming interface differs from the preferred unicast reverse path to the source.

D:

That explanation fits another condition: Receiver packets still target a shared-tree RP that no longer has active mapping. The evidence here is PIM RPF discards increase when routing chooses the other uplink. Its closer root cause is The incoming interface differs from the preferred unicast reverse path to the source.

Question 496

A multicast source transmits on a VLAN that also has a backup uplink. Observed: PIM RPF discards increase when routing chooses the other uplink. Which change-acceptance control is most relevant to preventing this exact failure?

  1. For each approved related change, verify that source registration and receiver joins converge on the same live RP. Flag recurrence if source registers continue to reach the old RP while receivers use the new RP.
  2. For each approved related change, verify that rPF counter increments stop and stream continuity returns. Flag recurrence if pIM RPF discards increase when routing chooses the other uplink.
  3. 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.
  4. For each approved related change, verify that receivers obtain only their authorized groups and cross-tenant traffic ceases. Flag recurrence if one tenant receives another tenant's IPTV stream on a shared access segment.

Explanation

Correct Answer

B:

The control is specific to the initial failure. It requires the result RPF counter increments stop and stream continuity returns. and treats PIM RPF discards increase when routing chooses the other uplink. as a failure signal. The causal concern is the incoming interface differs from the preferred unicast reverse path to the source.

Incorrect Answers

A:

This gate monitors a different failure, source registers continue to reach the old rp while receivers use the new rp. It would not detect the current problem: PIM RPF discards increase when routing chooses the other uplink. The appropriate check requires rPF counter increments stop and stream continuity returns.

C:

It is valid for another service scenario but checks receiver packets still target a shared-tree rp that no longer has active mapping. This case instead needs a gate for pim rpf discards increase when routing chooses the other uplink and evidence that rPF counter increments stop and stream continuity returns.

D:

The proposed control is tied to multicast group isolation and igmp membership controls are not scoped by tenant, typically observed when one tenant receives another tenant's IPTV stream on a shared access segment. Here the target is the incoming interface differs from the preferred unicast reverse path to the source; monitor rPF counter increments stop and stream continuity returns.

Question 497

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 should the routing engineer change first to address this particular symptom?

  1. Separate SSM and ASM address ranges in the multicast configuration.
  2. Permit authorized PIM neighbor control traffic without opening unrelated multicast flood.
  3. Configure consistent reachable RP discovery or static RP for authorized ASM groups.
  4. Enable supported SSM group range and source-specific membership throughout the path.

Explanation

Correct Answer

D:

The decisive evidence is that Receiver packets still target a shared-tree RP that no longer has active mapping. This follows from legacy any-source join configuration remains after the ssm group move. The focused remedy is to enable supported SSM group range and source-specific membership throughout the path. Confirm improvement when the (S,G) tree becomes active without RP dependency for SSM addresses. Validate on an approved lab or change window before touching production.

Incorrect Answers

A:

This change belongs to a different IP Multicast issue: A legacy ASM group is interpreted as source-specific and cannot use its RP. That issue involves ssm group-range classification overlaps with the existing asm service. The current symptom is Receiver packets still target a shared-tree RP that no longer has active mapping. It instead requires enable supported SSM group range and source-specific membership throughout the path.

B:

The option may be useful when pIM Hellos traverse a link whose multicast control traffic is filtered, but that is not the current evidence. Here, receiver packets still target a shared-tree RP that no longer has active mapping, indicating legacy any-source join configuration remains after the ssm group move. The targeted action is Enable supported SSM group range and source-specific membership throughout the path.

C:

This remediates the rendezvous point address is missing or unreachable for the asm group, normally indicated by Sources transmit packets but receivers see none until a static join is added. It would leave the observed problem (Receiver packets still target a shared-tree RP that no longer has active mapping) unresolved. Address it with enable supported SSM group range and source-specific membership throughout the path.

Question 498

An ISP migrates IPTV channels from ASM to SSM. Observed: Receiver packets still target a shared-tree RP that no longer has active mapping. Which acceptance observation best confirms that the proposed change worked?

  1. The (S,G) tree becomes active without RP dependency for SSM addresses.
  2. Both old ASM and new SSM groups build trees appropriate to their mode.
  3. PIM neighbors remain Up and multicast joins propagate.
  4. Receiver joins build a shared tree and receive source packets.

Explanation

Correct Answer

A:

This acceptance criterion tests the actual fault. The source evidence was Receiver packets still target a shared-tree RP that no longer has active mapping. The correction addresses legacy any-source join configuration remains after the ssm group move; success requires the (S,G) tree becomes active without RP dependency for SSM addresses.

Incorrect Answers

B:

It confirms an unrelated service correction: SSM group-range classification overlaps with the existing ASM service. The present case reports Receiver packets still target a shared-tree RP that no longer has active mapping. Its completion test is The (S,G) tree becomes active without RP dependency for SSM addresses.

C:

That observation would verify a separate fault involving a control-plane filter blocks required pim packets on the transit segment. Its symptom is PIM Hellos traverse a link whose multicast control traffic is filtered. For this case the actual issue is legacy any-source join configuration remains after the ssm group move, and the relevant success signal is The (S,G) tree becomes active without RP dependency for SSM addresses.

D:

This result is useful in another case with evidence Sources transmit packets but receivers see none until a static join is added. It does not test recovery from receiver packets still target a shared-tree rp that no longer has active mapping. Check instead whether the (S,G) tree becomes active without RP dependency for SSM addresses.

Question 499

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 is the most likely source of the observed routing or service failure?

  1. Legacy any-source join configuration remains after the SSM group move.
  2. A control-plane filter blocks required PIM packets on the transit segment.
  3. The rendezvous point address is missing or unreachable for the ASM group.
  4. SSM group-range classification overlaps with the existing ASM service.

Explanation

Correct Answer

A:

This explanation is the closest match to the observed symptom: Receiver packets still target a shared-tree RP that no longer has active mapping. The specified root issue is Legacy any-source join configuration remains after the SSM group move. Repair it through enable supported SSM group range and source-specific membership throughout the path, then check the (S,G) tree becomes active without RP dependency for SSM addresses.

Incorrect Answers

B:

The stated cause is possible elsewhere but explains pim hellos traverse a link whose multicast control traffic is filtered, not receiver packets still target a shared-tree rp that no longer has active mapping. This incident is better attributed to legacy any-source join configuration remains after the ssm group move.

C:

That explanation fits another condition: Sources transmit packets but receivers see none until a static join is added. The evidence here is Receiver packets still target a shared-tree RP that no longer has active mapping. Its closer root cause is Legacy any-source join configuration remains after the SSM group move.

D:

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: Receiver packets still target a shared-tree RP that no longer has active mapping. The likely cause is Legacy any-source join configuration remains after the SSM group move.

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.

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