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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 36

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.

Question 351

An ASM domain has receivers but no valid way to identify the rendezvous point for a particular group range. A colleague instead suggests: Allow supported PIM shortest-path-tree switchover when appropriate. Which corrective approach most directly addresses the original issue?

  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

B:

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

Incorrect Answers

A:

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

C:

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.

D:

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

Question 352

An enterprise network designer recommends: Configure a supported rendezvous-point mapping for the intended ASM groups. 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 IP link has unicast reachability but PIM sparse-mode routers do not appear as neighbors.
  3. An ASM domain has receivers but no valid way to identify the rendezvous point for a particular group range.
  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 Static rendezvous point action. The shared-tree join messages can reach the correct rendezvous point.

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 Enable and verify compatible PIM operation on the expected routed interfaces. Adjacent multicast routers can exchange Hello and build control-plane neighbor 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 353

The designated router at an ASM source receives traffic for a newly active source that RP receivers must discover. Which Junos networking action or protocol decision best addresses this requirement?

  1. Run supported PIM sparse-mode and establish receiver-driven join state.
  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. Use PIM Join/Prune behavior to withdraw unneeded branch state upstream.

Explanation

Correct Answer

C:

This action addresses PIM register message. The RP learns the active source and can connect it to interested shared-tree receivers.

Incorrect Answers

A:

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

B:

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 register message requirement.

D:

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 register message requirement.

Question 354

A Junos network engineer takes this step: Allow the designated source-side router to register the source with the RP according to PIM-SM behavior. 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

D:

This is the direct result of the PIM register message decision: The RP learns the active source and can connect it to interested shared-tree receivers.

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.

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

Question 355

The designated router at an ASM source receives traffic for a newly active source that RP receivers must discover. A colleague instead suggests: Use a PIM SSM (S,G) join toward the known source. Which corrective approach most directly addresses the original issue?

  1. Allow the designated source-side router to register the source with the RP according to PIM-SM behavior.
  2. Use PIM Join/Prune behavior to withdraw unneeded branch state upstream.
  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

A:

This corrective choice addresses PIM register message. The RP learns the active source and can connect it to interested shared-tree receivers.

Incorrect Answers

B:

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

C:

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

D:

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

Question 356

An enterprise network designer recommends: Allow the designated source-side router to register the source with the RP according to PIM-SM behavior. 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. The designated router at an ASM source receives traffic for a newly active source that RP receivers must discover.
  3. A viewer stops watching a multicast group and the last local receiver disappears from a branch.
  4. A network should carry multicast streams only over branches with interested receivers rather than flooding every multicast-enabled link.

Explanation

Correct Answer

B:

This case requires the PIM register message action. The RP learns the active source and can connect it to interested shared-tree 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 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 Run supported PIM sparse-mode and establish receiver-driven join state. Routers build multicast distribution branches in response to explicit joins.

Question 357

Receivers initially get ASM traffic through a rendezvous point, but the RP transit route is not the most efficient path from the source. Which Junos networking action or protocol decision best addresses this requirement?

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

Explanation

Correct Answer

D:

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

Incorrect Answers

A:

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 Shortest-path-tree switchover 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 Shortest-path-tree switchover requirement.

C:

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 Shortest-path-tree switchover requirement.

Question 358

A Junos network engineer takes this step: Allow supported PIM shortest-path-tree switchover when appropriate. Which outcome most directly follows?

  1. A receiver-side router can join a direct source tree rather than continuing through the shared RP tree.
  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. The shared-tree join messages can reach the correct rendezvous point.

Explanation

Correct Answer

A:

This is the direct result of the Shortest-path-tree switchover decision: A receiver-side router can join a direct source tree rather than continuing through the shared RP tree.

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

Question 359

Receivers initially get ASM traffic through a rendezvous point, but the RP transit route is not the most efficient path from the source. A colleague instead suggests: Use the PIM designated-router election process for the shared LAN. Which corrective approach most directly addresses the original issue?

  1. Use the PIM designated-router election process for the shared LAN.
  2. Allow supported PIM shortest-path-tree switchover when appropriate.
  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 corrective choice addresses Shortest-path-tree switchover. A receiver-side router can join a direct source tree rather than continuing through the shared RP tree.

Incorrect Answers

A:

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

C:

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

D:

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

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.

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