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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 56

Question 550

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

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

Explanation

Correct Answer

A:

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

Incorrect Answers

B:

This result is useful in another case with evidence The link is in dense-mode flood-and-prune behavior rather than sparse-mode operation. It does not test recovery from traffic reaches links with no subscribers until prune state forms. Check instead whether unsubscribed transit links no longer carry unnecessary multicast traffic.

C:

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

D:

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

Question 551

A video provider runs PIM dense mode on a shared transit interface. Observed: Traffic reaches links with no subscribers until prune state forms. What underlying protocol or service configuration problem best explains the evidence?

  1. Dense-mode initial flooding conflicts with the bandwidth-sensitive shared network.
  2. PIM operating mode does not match the intended sparse distribution tree.
  3. RPF-specific policy chooses an unintended interface relative to actual source arrival.
  4. PIM sparse mode rightly prunes branches without subscribed receivers.

Explanation

Correct Answer

A:

Because traffic reaches links with no subscribers until prune state forms, the likely cause is dense-mode initial flooding conflicts with the bandwidth-sensitive shared network. It is testable: Move the relevant service to an appropriate sparse/SSM distribution policy. Expected follow-up: Unsubscribed transit links no longer carry unnecessary multicast traffic.

Incorrect Answers

B:

That explanation fits another condition: The link is in dense-mode flood-and-prune behavior rather than sparse-mode operation. The evidence here is Traffic reaches links with no subscribers until prune state forms. Its closer root cause is Dense-mode initial flooding conflicts with the bandwidth-sensitive shared network.

C:

The stated cause is possible elsewhere but explains multicast stream briefly loops and then disappears even though source route remains in rib, not traffic reaches links with no subscribers until prune state forms. This incident is better attributed to dense-mode initial flooding conflicts with the bandwidth-sensitive shared network.

D:

PIM sparse mode rightly prunes branches without subscribed receivers. would normally be accompanied by operators report no outgoing multicast copies and assume a network failure. The observed symptom is different: Traffic reaches links with no subscribers until prune state forms. The likely cause is Dense-mode initial flooding conflicts with the bandwidth-sensitive shared network.

Question 552

A video provider runs PIM dense mode on a shared transit interface. Observed: Traffic reaches links with no subscribers until prune state forms. Which ongoing validation gate would best detect a recurrence of this problem?

  1. For each approved related change, verify that only receiver-joined paths carry the multicast stream after convergence. Flag recurrence if the link is in dense-mode flood-and-prune behavior rather than sparse-mode operation.
  2. For each approved related change, verify that with a deliberate receiver join, forwarding appears only on the subscribed branch. Flag recurrence if operators report no outgoing multicast copies and assume a network failure.
  3. For each approved related change, verify that unsubscribed transit links no longer carry unnecessary multicast traffic. Flag recurrence if traffic reaches links with no subscribers until prune state forms.
  4. 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.

Explanation

Correct Answer

C:

A useful regression gate tests whether unsubscribed transit links no longer carry unnecessary multicast traffic and alerts when traffic reaches links with no subscribers until prune state forms. This directly checks the technical weakness: Dense-mode initial flooding conflicts with the bandwidth-sensitive shared network. 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 the link is in dense-mode flood-and-prune behavior rather than sparse-mode operation. This case instead needs a gate for traffic reaches links with no subscribers until prune state forms and evidence that unsubscribed transit links no longer carry unnecessary multicast traffic.

B:

This gate monitors a different failure, operators report no outgoing multicast copies and assume a network failure. It would not detect the current problem: Traffic reaches links with no subscribers until prune state forms. The appropriate check requires unsubscribed transit links no longer carry unnecessary multicast traffic.

D:

The proposed control is tied to rpf-specific policy chooses an unintended interface relative to actual source arrival, typically observed when multicast stream briefly loops and then disappears even though source route remains in RIB. Here the target is dense-mode initial flooding conflicts with the bandwidth-sensitive shared network; monitor unsubscribed transit links no longer carry unnecessary multicast traffic.

Question 553

A PE with multicast RPF routing policy changes its selected upstream neighbor. Observed: Multicast stream briefly loops and then disappears even though source route remains in RIB. Which change most directly corrects the failure while respecting the existing service boundary?

  1. Reconcile multicast reverse-path policy with approved source reachability.
  2. Repair consistent unicast source-prefix reachability across the relevant areas.
  3. Check IGMP version and group joins on the access side and PIM on the upstream side.
  4. Apply tenant-specific group authorization and forwarding-instance separation.

Explanation

Correct Answer

A:

The observed condition is Multicast stream briefly loops and then disappears even though source route remains in RIB. That indicates rpf-specific policy chooses an unintended interface relative to actual source arrival. Applying the proposed remedy directly changes that condition. A concrete completion check is: The RPF interface and incoming packets agree with no continuing loop or drop.

Incorrect Answers

B:

The option may be useful when one receiver never sees the stream although the other is healthy, but that is not the current evidence. Here, multicast stream briefly loops and then disappears even though source route remains in RIB, indicating rpf-specific policy chooses an unintended interface relative to actual source arrival. The targeted action is Reconcile multicast reverse-path policy with approved source reachability.

C:

This change belongs to a different IP Multicast issue: The upstream PE never adds the receiver interface to its forwarding state. That issue involves igmp membership reporting or the igmp-to-pim boundary is misconfigured. The current symptom is Multicast stream briefly loops and then disappears even though source route remains in RIB. It instead requires reconcile multicast reverse-path policy with approved source reachability.

D:

This remediates multicast group isolation and igmp membership controls are not scoped by tenant, normally indicated by One tenant receives another tenant's IPTV stream on a shared access segment. It would leave the observed problem (Multicast stream briefly loops and then disappears even though source route remains in RIB) unresolved. Address it with reconcile multicast reverse-path policy with approved source reachability.

Question 554

A PE with multicast RPF routing policy changes its selected upstream neighbor. Observed: Multicast stream briefly loops and then disappears even though source route remains in RIB. After the correction, which result would most convincingly show that this fault is resolved?

  1. Both receiver routers pass RPF checks and forward the intended source tree.
  2. Receivers obtain only their authorized groups and cross-tenant traffic ceases.
  3. The RPF interface and incoming packets agree with no continuing loop or drop.
  4. The PE maps the local membership into forwarding toward the receiver.

Explanation

Correct Answer

C:

After reconcile multicast reverse-path policy with approved source reachability, inspect whether the RPF interface and incoming packets agree with no continuing loop or drop. This closes the loop between the reported observation (Multicast stream briefly loops and then disappears even though source route remains in RIB) and the underlying issue (RPF-specific policy chooses an unintended interface relative to actual source arrival).

Incorrect Answers

A:

That observation would verify a separate fault involving reverse-path routing to the source differs across area boundaries. Its symptom is One receiver never sees the stream although the other is healthy. For this case the actual issue is rpf-specific policy chooses an unintended interface relative to actual source arrival, and the relevant success signal is The RPF interface and incoming packets agree with no continuing loop or drop.

B:

This result is useful in another case with evidence One tenant receives another tenant's IPTV stream on a shared access segment. It does not test recovery from multicast stream briefly loops and then disappears even though source route remains in rib. Check instead whether the RPF interface and incoming packets agree with no continuing loop or drop.

D:

It confirms an unrelated service correction: IGMP membership reporting or the IGMP-to-PIM boundary is misconfigured. The present case reports Multicast stream briefly loops and then disappears even though source route remains in RIB. Its completion test is The RPF interface and incoming packets agree with no continuing loop or drop.

Question 555

A PE with multicast RPF routing policy changes its selected upstream neighbor. Observed: Multicast stream briefly loops and then disappears even though source route remains in RIB. Which root cause is most consistent with this symptom?

  1. RPF-specific policy chooses an unintended interface relative to actual source arrival.
  2. Reverse-path routing to the source differs across area boundaries.
  3. IGMP membership reporting or the IGMP-to-PIM boundary is misconfigured.
  4. Multicast group isolation and IGMP membership controls are not scoped by tenant.

Explanation

Correct Answer

A:

The reported evidence—Multicast stream briefly loops and then disappears even though source route remains in RIB—supports rpf-specific policy chooses an unintended interface relative to actual source arrival. The appropriate intervention is to reconcile multicast reverse-path policy with approved source reachability, with confirmation from the RPF interface and incoming packets agree with no continuing loop or drop. Other causes require actual device-state verification.

Incorrect Answers

B:

The stated cause is possible elsewhere but explains one receiver never sees the stream although the other is healthy, not multicast stream briefly loops and then disappears even though source route remains in rib. This incident is better attributed to rpf-specific policy chooses an unintended interface relative to actual source arrival.

C:

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

D:

That explanation fits another condition: One tenant receives another tenant's IPTV stream on a shared access segment. The evidence here is Multicast stream briefly loops and then disappears even though source route remains in RIB. Its closer root cause is RPF-specific policy chooses an unintended interface relative to actual source arrival.

Question 556

A PE with multicast RPF routing policy changes its selected upstream neighbor. Observed: Multicast stream briefly loops and then disappears even though source route remains in RIB. Which change-acceptance control is most relevant to preventing this exact failure?

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

Explanation

Correct Answer

C:

The control is specific to the initial failure. It requires the result The RPF interface and incoming packets agree with no continuing loop or drop. and treats Multicast stream briefly loops and then disappears even though source route remains in RIB. as a failure signal. The causal concern is rpf-specific policy chooses an unintended interface relative to actual source arrival.

Incorrect Answers

A:

It is valid for another service scenario but checks one tenant receives another tenant's iptv stream on a shared access segment. This case instead needs a gate for multicast stream briefly loops and then disappears even though source route remains in rib and evidence that the RPF interface and incoming packets agree with no continuing loop or drop.

B:

The proposed control is tied to reverse-path routing to the source differs across area boundaries, typically observed when one receiver never sees the stream although the other is healthy. Here the target is rpf-specific policy chooses an unintended interface relative to actual source arrival; monitor the RPF interface and incoming packets agree with no continuing loop or drop.

D:

This gate monitors a different failure, the upstream pe never adds the receiver interface to its forwarding state. It would not detect the current problem: Multicast stream briefly loops and then disappears even though source route remains in RIB. The appropriate check requires the RPF interface and incoming packets agree with no continuing loop or drop.

Question 557

An ISP allocates several multicast group ranges for different tenants. Observed: One tenant receives another tenant's IPTV stream on a shared access segment. What should the routing engineer change first to address this particular symptom?

  1. Correct unicast source routing or relocate the source ingress to the expected RPF interface.
  2. Synchronize the intended group-to-RP mapping and confirm source registration.
  3. Configure consistent reachable RP discovery or static RP for authorized ASM groups.
  4. Apply tenant-specific group authorization and forwarding-instance separation.

Explanation

Correct Answer

D:

The decisive evidence is that One tenant receives another tenant's IPTV stream on a shared access segment. This follows from multicast group isolation and igmp membership controls are not scoped by tenant. The focused remedy is to apply tenant-specific group authorization and forwarding-instance separation. Confirm improvement when receivers obtain only their authorized groups and cross-tenant traffic ceases. Validate on an approved lab or change window before touching production.

Incorrect Answers

A:

The option may be useful when pIM RPF discards increase when routing chooses the other uplink, but that is not the current evidence. Here, one tenant receives another tenant's IPTV stream on a shared access segment, indicating multicast group isolation and igmp membership controls are not scoped by tenant. The targeted action is Apply tenant-specific group authorization and forwarding-instance separation.

B:

This remediates the rp mapping is inconsistent across source and receiver routers, normally indicated by Source registers continue to reach the old RP while receivers use the new RP. It would leave the observed problem (One tenant receives another tenant's IPTV stream on a shared access segment) unresolved. Address it with apply tenant-specific group authorization and forwarding-instance separation.

C:

This change belongs to a different IP Multicast issue: Sources transmit packets but receivers see none until a static join is added. That issue involves the rendezvous point address is missing or unreachable for the asm group. The current symptom is One tenant receives another tenant's IPTV stream on a shared access segment. It instead requires apply tenant-specific group authorization and forwarding-instance separation.

Question 558

An ISP allocates several multicast group ranges for different tenants. Observed: One tenant receives another tenant's IPTV stream on a shared access segment. Which acceptance observation best confirms that the proposed change worked?

  1. Receivers obtain only their authorized groups and cross-tenant traffic ceases.
  2. RPF counter increments stop and stream continuity returns.
  3. Source registration and receiver joins converge on the same live RP.
  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 One tenant receives another tenant's IPTV stream on a shared access segment. The correction addresses multicast group isolation and igmp membership controls are not scoped by tenant; success requires receivers obtain only their authorized groups and cross-tenant traffic ceases.

Incorrect Answers

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 multicast group isolation and igmp membership controls are not scoped by tenant, and the relevant success signal is Receivers obtain only their authorized groups and cross-tenant traffic ceases.

C:

This result is useful in another case with evidence Source registers continue to reach the old RP while receivers use the new RP. It does not test recovery from one tenant receives another tenant's iptv stream on a shared access segment. Check instead whether receivers obtain only their authorized groups and cross-tenant traffic ceases.

D:

It confirms an unrelated service correction: The rendezvous point address is missing or unreachable for the ASM group. The present case reports One tenant receives another tenant's IPTV stream on a shared access segment. Its completion test is Receivers obtain only their authorized groups and cross-tenant traffic ceases.

Question 559

An ISP allocates several multicast group ranges for different tenants. Observed: One tenant receives another tenant's IPTV stream on a shared access segment. What is the most likely source of the observed routing or service failure?

  1. The incoming interface differs from the preferred unicast reverse path to the source.
  2. The rendezvous point address is missing or unreachable for the ASM group.
  3. Multicast group isolation and IGMP membership controls are not scoped by tenant.
  4. The RP mapping is inconsistent across source and receiver routers.

Explanation

Correct Answer

C:

This explanation is the closest match to the observed symptom: One tenant receives another tenant's IPTV stream on a shared access segment. The specified root issue is Multicast group isolation and IGMP membership controls are not scoped by tenant. Repair it through apply tenant-specific group authorization and forwarding-instance separation, then check receivers obtain only their authorized groups and cross-tenant traffic ceases.

Incorrect Answers

A:

The stated cause is possible elsewhere but explains pim rpf discards increase when routing chooses the other uplink, not one tenant receives another tenant's iptv stream on a shared access segment. This incident is better attributed to multicast group isolation and igmp membership controls are not scoped by tenant.

B:

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: One tenant receives another tenant's IPTV stream on a shared access segment. The likely cause is Multicast group isolation and IGMP membership controls are not scoped by tenant.

D:

That explanation fits another condition: Source registers continue to reach the old RP while receivers use the new RP. The evidence here is One tenant receives another tenant's IPTV stream on a shared access segment. Its closer root cause is Multicast group isolation and IGMP membership controls are not scoped by tenant.

Question 560

An ISP allocates several multicast group ranges for different tenants. Observed: One tenant receives another tenant's IPTV stream on a shared access segment. What operational check best guards against this problem returning?

  1. 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.
  2. 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.
  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 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.

Explanation

Correct Answer

B:

This control asks for the same recovery evidence (Receivers obtain only their authorized groups and cross-tenant traffic ceases) and flags recurrence of the same failure (One tenant receives another tenant's IPTV stream on a shared access segment). It targets the underlying issue, multicast group isolation and igmp membership controls are not scoped by tenant, rather than a different service problem. The exact cadence must be agreed with operations.

Incorrect Answers

A:

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 multicast group isolation and igmp membership controls are not scoped by tenant; monitor receivers obtain only their authorized groups and cross-tenant traffic ceases.

C:

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: One tenant receives another tenant's IPTV stream on a shared access segment. The appropriate check requires receivers obtain only their authorized groups and cross-tenant traffic ceases.

D:

It is valid for another service scenario but checks source registers continue to reach the old rp while receivers use the new rp. This case instead needs a gate for one tenant receives another tenant's iptv stream on a shared access segment and evidence that receivers obtain only their authorized groups and cross-tenant traffic ceases.

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