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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 35

Question 340

An enterprise network designer recommends: Run supported PIM sparse-mode and establish receiver-driven join state. Which situation most clearly calls for this action?

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

Explanation

Correct Answer

B:

This case requires the Sparse-mode joins action. Routers build multicast distribution branches in response to explicit joins.

Incorrect Answers

A:

This other case would be better matched to Use a PIM SSM (S,G) join toward the known source. Multicast forwarding can follow the source tree without an ASM rendezvous point.

C:

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.

D:

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.

Question 341

An IP link has unicast reachability but PIM sparse-mode routers do not appear as neighbors. Which Junos networking action or protocol decision best addresses this requirement?

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

Explanation

Correct Answer

D:

This action addresses PIM neighbor discovery. Adjacent multicast routers can exchange Hello and build control-plane neighbor state.

Incorrect Answers

A:

That action targets PIM designated router: A selected PIM router acts on the LAN's receiver interest to build upstream state. It does not directly resolve the stated PIM neighbor discovery requirement.

B:

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 neighbor discovery requirement.

C:

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 neighbor discovery requirement.

Question 342

A Junos network engineer takes this step: Enable and verify compatible PIM operation on the expected routed interfaces. Which outcome most directly follows?

  1. Adjacent multicast routers can exchange Hello and build control-plane neighbor state.
  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. The shared-tree join messages can reach the correct rendezvous point.

Explanation

Correct Answer

A:

This is the direct result of the PIM neighbor discovery decision: Adjacent multicast routers can exchange Hello and build control-plane neighbor state.

Incorrect Answers

B:

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

C:

This outcome is associated with PIM designated router (Use the PIM designated-router election process for the shared LAN.), not the specified action.

D:

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

Question 343

An IP link has unicast reachability but PIM sparse-mode routers do not appear as neighbors. A colleague instead suggests: Configure a supported rendezvous-point mapping for the intended ASM groups. Which corrective approach most directly addresses the original issue?

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

Explanation

Correct Answer

B:

This corrective choice addresses PIM neighbor discovery. Adjacent multicast routers can exchange Hello and build control-plane neighbor state.

Incorrect Answers

A:

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 Static rendezvous point instead. The shared-tree join messages can reach the correct rendezvous point.

D:

That alternative applies to PIM designated router instead. A selected PIM router acts on the LAN's receiver interest to build upstream state.

Question 344

An enterprise network designer recommends: Enable and verify compatible PIM operation on the expected routed interfaces. Which situation most clearly calls for this action?

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

Explanation

Correct Answer

C:

This case requires the PIM neighbor discovery action. Adjacent multicast routers can exchange Hello and build control-plane neighbor state.

Incorrect Answers

A:

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.

B:

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.

D:

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.

Question 345

A viewer stops watching a multicast group and the last local receiver disappears from a branch. Which Junos networking action or protocol decision best addresses this requirement?

  1. Allow the designated source-side router to register the source with the RP according to PIM-SM behavior.
  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. Use a PIM SSM (S,G) join toward the known source.

Explanation

Correct Answer

C:

This action addresses PIM join-prune control. Upstream routers can stop sending traffic to a branch with no interested receivers.

Incorrect Answers

A:

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 join-prune control requirement.

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 join-prune control requirement.

D:

That action targets PIM SSM join state: Multicast forwarding can follow the source tree without an ASM rendezvous point. It does not directly resolve the stated PIM join-prune control requirement.

Question 346

A Junos network engineer takes this step: Use PIM Join/Prune behavior to withdraw unneeded branch state upstream. Which outcome most directly follows?

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

Explanation

Correct Answer

D:

This is the direct result of the PIM join-prune control decision: Upstream routers can stop sending traffic to a branch with no interested receivers.

Incorrect Answers

A:

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

B:

This outcome is associated with PIM SSM join state (Use a PIM SSM (S,G) join toward the known source.), not the specified action.

C:

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 347

A viewer stops watching a multicast group and the last local receiver disappears from a branch. A colleague instead suggests: Allow the designated source-side router to register the source with the RP according to PIM-SM behavior. Which corrective approach most directly addresses the original issue?

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

Explanation

Correct Answer

A:

This corrective choice addresses PIM join-prune control. Upstream routers can stop sending traffic to a branch with no interested receivers.

Incorrect Answers

B:

That alternative applies to PIM SSM join state instead. Multicast forwarding can follow the source tree without an ASM rendezvous point.

C:

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 348

An enterprise network designer recommends: Use PIM Join/Prune behavior to withdraw unneeded branch state upstream. Which situation most clearly calls for this action?

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

Explanation

Correct Answer

B:

This case requires the PIM join-prune control action. Upstream routers can stop sending traffic to a branch with no interested receivers.

Incorrect Answers

A:

This other case would be better matched to Use a PIM SSM (S,G) join toward the known source. Multicast forwarding can follow the source tree without an ASM rendezvous point.

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.

D:

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.

Question 349

An ASM domain has receivers but no valid way to identify the rendezvous point for a particular group range. 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

D:

This action addresses Static rendezvous point. The shared-tree join messages can reach the correct rendezvous point.

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 Static rendezvous point requirement.

B:

That action targets PIM designated router: A selected PIM router acts on the LAN's receiver interest to build upstream state. It does not directly resolve the stated Static rendezvous point 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 Static rendezvous point requirement.

Question 350

A Junos network engineer takes this step: Configure a supported rendezvous-point mapping for the intended ASM groups. Which outcome most directly follows?

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

Explanation

Correct Answer

A:

This is the direct result of the Static rendezvous point decision: The shared-tree join messages can reach the correct rendezvous point.

Incorrect Answers

B:

This outcome is associated with PIM designated router (Use the PIM designated-router election process for the shared LAN.), not the specified action.

C:

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

D:

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

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