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Exam Code: JN0-650

Exam Name: Enterprise Routing and Switching, Professional (JNCIP-ENT)

Certification Provider: Juniper

Corresponding Certification: JNCIP-ENT

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Juniper JN0-650 Practice Test 37

Question 360

An enterprise network designer recommends: Allow supported PIM shortest-path-tree switchover when appropriate. Which situation most clearly calls for this action?

  1. Two PIM routers serve the same receiver VLAN and a designated router must originate appropriate upstream joins.
  2. An ASM domain has receivers but no valid way to identify the rendezvous point for a particular group range.
  3. Receivers initially get ASM traffic through a rendezvous point, but the RP transit route is not the most efficient path from the source.
  4. An IP link has unicast reachability but PIM sparse-mode routers do not appear as neighbors.

Explanation

Correct Answer

C:

This case requires the Shortest-path-tree switchover action. A receiver-side router can join a direct source tree rather than continuing through the shared RP tree.

Incorrect Answers

A:

This other case would be better matched to Use the PIM designated-router election process for the shared LAN. A selected PIM router acts on the LAN's receiver interest to build upstream state.

B:

This other case would be better matched to Configure a supported rendezvous-point mapping for the intended ASM groups. The shared-tree join messages can reach the correct rendezvous point.

D:

This other case would be better matched to Enable and verify compatible PIM operation on the expected routed interfaces. Adjacent multicast routers can exchange Hello and build control-plane neighbor state.

Question 361

A source-specific multicast deployment has no RP by design and joins must target an identified transmitter. Which Junos networking action or protocol decision best addresses this requirement?

  1. Use a PIM SSM (S,G) join toward the known source.
  2. Run supported PIM sparse-mode and establish receiver-driven join state.
  3. Use PIM Join/Prune behavior to withdraw unneeded branch state upstream.
  4. Allow the designated source-side router to register the source with the RP according to PIM-SM behavior.

Explanation

Correct Answer

A:

This action addresses PIM SSM join state. Multicast forwarding can follow the source tree without an ASM rendezvous point.

Incorrect Answers

B:

That action targets Sparse-mode joins: Routers build multicast distribution branches in response to explicit joins. It does not directly resolve the stated PIM SSM join state requirement.

C:

That action targets PIM join-prune control: Upstream routers can stop sending traffic to a branch with no interested receivers. It does not directly resolve the stated PIM SSM join state requirement.

D:

That action targets PIM register message: The RP learns the active source and can connect it to interested shared-tree receivers. It does not directly resolve the stated PIM SSM join state requirement.

Question 362

A Junos network engineer takes this step: Use a PIM SSM (S,G) join toward the known source. Which outcome most directly follows?

  1. Upstream routers can stop sending traffic to a branch with no interested receivers.
  2. Multicast forwarding can follow the source tree without an ASM rendezvous point.
  3. Routers build multicast distribution branches in response to explicit joins.
  4. The RP learns the active source and can connect it to interested shared-tree receivers.

Explanation

Correct Answer

B:

This is the direct result of the PIM SSM join state decision: Multicast forwarding can follow the source tree without an ASM rendezvous point.

Incorrect Answers

A:

This outcome is associated with PIM join-prune control (Use PIM Join/Prune behavior to withdraw unneeded branch state upstream.), not the specified action.

C:

This outcome is associated with Sparse-mode joins (Run supported PIM sparse-mode and establish receiver-driven join state.), not the specified action.

D:

This outcome is associated with PIM register message (Allow the designated source-side router to register the source with the RP according to PIM-SM behavior.), not the specified action.

Question 363

A source-specific multicast deployment has no RP by design and joins must target an identified transmitter. A colleague instead suggests: Run supported PIM sparse-mode and establish receiver-driven join state. Which corrective approach most directly addresses the original issue?

  1. Use PIM Join/Prune behavior to withdraw unneeded branch state upstream.
  2. Allow the designated source-side router to register the source with the RP according to PIM-SM behavior.
  3. Use a PIM SSM (S,G) join toward the known source.
  4. Run supported PIM sparse-mode and establish receiver-driven join state.

Explanation

Correct Answer

C:

This corrective choice addresses PIM SSM join state. Multicast forwarding can follow the source tree without an ASM rendezvous point.

Incorrect Answers

A:

That alternative applies to PIM join-prune control instead. Upstream routers can stop sending traffic to a branch with no interested receivers.

B:

That alternative applies to PIM register message instead. The RP learns the active source and can connect it to interested shared-tree receivers.

D:

That alternative applies to Sparse-mode joins instead. Routers build multicast distribution branches in response to explicit joins.

Question 364

An enterprise network designer recommends: Use a PIM SSM (S,G) join toward the known source. Which situation most clearly calls for this action?

  1. A viewer stops watching a multicast group and the last local receiver disappears from a branch.
  2. The designated router at an ASM source receives traffic for a newly active source that RP receivers must discover.
  3. A network should carry multicast streams only over branches with interested receivers rather than flooding every multicast-enabled link.
  4. A source-specific multicast deployment has no RP by design and joins must target an identified transmitter.

Explanation

Correct Answer

D:

This case requires the PIM SSM join state action. Multicast forwarding can follow the source tree without an ASM rendezvous point.

Incorrect Answers

A:

This other case would be better matched to Use PIM Join/Prune behavior to withdraw unneeded branch state upstream. Upstream routers can stop sending traffic to a branch with no interested receivers.

B:

This other case would be better matched to Allow the designated source-side router to register the source with the RP according to PIM-SM behavior. The RP learns the active source and can connect it to interested shared-tree receivers.

C:

This other case would be better matched to Run supported PIM sparse-mode and establish receiver-driven join state. Routers build multicast distribution branches in response to explicit joins.

Question 365

Two PIM routers serve the same receiver VLAN and a designated router must originate appropriate upstream joins. Which Junos networking action or protocol decision best addresses this requirement?

  1. Allow supported PIM shortest-path-tree switchover when appropriate.
  2. Use the PIM designated-router election process for the shared LAN.
  3. Enable and verify compatible PIM operation on the expected routed interfaces.
  4. Configure a supported rendezvous-point mapping for the intended ASM groups.

Explanation

Correct Answer

B:

This action addresses PIM designated router. A selected PIM router acts on the LAN's receiver interest to build upstream state.

Incorrect Answers

A:

That action targets Shortest-path-tree switchover: A receiver-side router can join a direct source tree rather than continuing through the shared RP tree. It does not directly resolve the stated PIM designated router requirement.

C:

That action targets PIM neighbor discovery: Adjacent multicast routers can exchange Hello and build control-plane neighbor state. It does not directly resolve the stated PIM designated router requirement.

D:

That action targets Static rendezvous point: The shared-tree join messages can reach the correct rendezvous point. It does not directly resolve the stated PIM designated router requirement.

Question 366

A Junos network engineer takes this step: Use the PIM designated-router election process for the shared LAN. Which outcome most directly follows?

  1. The shared-tree join messages can reach the correct rendezvous point.
  2. A receiver-side router can join a direct source tree rather than continuing through the shared RP tree.
  3. A selected PIM router acts on the LAN's receiver interest to build upstream state.
  4. Adjacent multicast routers can exchange Hello and build control-plane neighbor state.

Explanation

Correct Answer

C:

This is the direct result of the PIM designated router decision: A selected PIM router acts on the LAN's receiver interest to build upstream state.

Incorrect Answers

A:

This outcome is associated with Static rendezvous point (Configure a supported rendezvous-point mapping for the intended ASM groups.), not the specified action.

B:

This outcome is associated with Shortest-path-tree switchover (Allow supported PIM shortest-path-tree switchover when appropriate.), not the specified action.

D:

This outcome is associated with PIM neighbor discovery (Enable and verify compatible PIM operation on the expected routed interfaces.), not the specified action.

Question 367

Two PIM routers serve the same receiver VLAN and a designated router must originate appropriate upstream joins. A colleague instead suggests: Enable and verify compatible PIM operation on the expected routed interfaces. Which corrective approach most directly addresses the original issue?

  1. Configure a supported rendezvous-point mapping for the intended ASM groups.
  2. Allow supported PIM shortest-path-tree switchover when appropriate.
  3. Enable and verify compatible PIM operation on the expected routed interfaces.
  4. Use the PIM designated-router election process for the shared LAN.

Explanation

Correct Answer

D:

This corrective choice addresses PIM designated router. A selected PIM router acts on the LAN's receiver interest to build upstream state.

Incorrect Answers

A:

That alternative applies to Static rendezvous point instead. The shared-tree join messages can reach the correct rendezvous point.

B:

That alternative applies to Shortest-path-tree switchover instead. A receiver-side router can join a direct source tree rather than continuing through the shared RP tree.

C:

That alternative applies to PIM neighbor discovery instead. Adjacent multicast routers can exchange Hello and build control-plane neighbor state.

Question 368

An enterprise network designer recommends: Use the PIM designated-router election process for the shared LAN. Which situation most clearly calls for this action?

  1. Two PIM routers serve the same receiver VLAN and a designated router must originate appropriate upstream joins.
  2. An ASM domain has receivers but no valid way to identify the rendezvous point for a particular group range.
  3. Receivers initially get ASM traffic through a rendezvous point, but the RP transit route is not the most efficient path from the source.
  4. An IP link has unicast reachability but PIM sparse-mode routers do not appear as neighbors.

Explanation

Correct Answer

A:

This case requires the PIM designated router action. A selected PIM router acts on the LAN's receiver interest to build upstream state.

Incorrect Answers

B:

This other case would be better matched to Configure a supported rendezvous-point mapping for the intended ASM groups. The shared-tree join messages can reach the correct rendezvous point.

C:

This other case would be better matched to Allow supported PIM shortest-path-tree switchover when appropriate. A receiver-side router can join a direct source tree rather than continuing through the shared RP tree.

D:

This other case would be better matched to Enable and verify compatible PIM operation on the expected routed interfaces. Adjacent multicast routers can exchange Hello and build control-plane neighbor state.

Question 369

An ASM service needs resilient RP access from different sites while clients use a single logical RP address. Which Junos networking action or protocol decision best addresses this requirement?

  1. Deploy a supported anycast rendezvous-point design across redundant RP nodes.
  2. Configure and apply supported multicast scoping or group filters for the allowed ranges.
  3. Use an appropriate Multicast Source Discovery Protocol peering design where supported.
  4. Apply a carefully scoped multicast policy or boundary to the prohibited group range.

Explanation

Correct Answer

A:

This action addresses Anycast RP resiliency. Receivers can use one RP identity while multiple physical routers offer resilient RP service.

Incorrect Answers

B:

That action targets Multicast import policy: Unauthorized groups can be excluded from crossing the controlled boundary. It does not directly resolve the stated Anycast RP resiliency requirement.

C:

That action targets MSDP source coordination: Source-active information can be shared between participating RP nodes. It does not directly resolve the stated Anycast RP resiliency requirement.

D:

That action targets Multicast group scoping: Multicast control or data exchange for the protected groups can be contained within the intended domain. It does not directly resolve the stated Anycast RP resiliency requirement.

Question 370

A Junos network engineer takes this step: Deploy a supported anycast rendezvous-point design across redundant RP nodes. Which outcome most directly follows?

  1. Source-active information can be shared between participating RP nodes.
  2. Receivers can use one RP identity while multiple physical routers offer resilient RP service.
  3. Multicast control or data exchange for the protected groups can be contained within the intended domain.
  4. Unauthorized groups can be excluded from crossing the controlled boundary.

Explanation

Correct Answer

B:

This is the direct result of the Anycast RP resiliency decision: Receivers can use one RP identity while multiple physical routers offer resilient RP service.

Incorrect Answers

A:

This outcome is associated with MSDP source coordination (Use an appropriate Multicast Source Discovery Protocol peering design where supported.), not the specified action.

C:

This outcome is associated with Multicast group scoping (Apply a carefully scoped multicast policy or boundary to the prohibited group range.), not the specified action.

D:

This outcome is associated with Multicast import policy (Configure and apply supported multicast scoping or group filters for the allowed ranges.), not the specified action.

Enterprise Routing and Switching, Professional (JNCIP-ENT) (JN0-650) Practice Tests