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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 34

Question 330

A Junos network engineer takes this step: Inspect the Junos IGMP snooping group table and subscriber interface memberships. Which outcome most directly follows?

  1. Membership reports can be refreshed and unused snooping state can age correctly.
  2. The router can identify an incoming-interface RPF failure and avoid accepting a loop-prone path.
  3. The local router can track interested group members on the attached network.
  4. The engineer can see which ports should receive group traffic after the VLAN change.

Explanation

Correct Answer

D:

This is the direct result of the IGMP snooping verification decision: The engineer can see which ports should receive group traffic after the VLAN change.

Incorrect Answers

A:

This outcome is associated with IGMP querier absence (Provide a suitable IGMP querier function on the VLAN.), not the specified action.

B:

This outcome is associated with RPF source interface (Check the reverse-path-forwarding lookup against the unicast route to the source.), not the specified action.

C:

This outcome is associated with IGMP local receiver join (Use IGMP membership reporting between the receiver and multicast router.), not the specified action.

Question 331

Receivers complain about missing video after a VLAN change and the access switch may have lost learned multicast member ports. A colleague instead suggests: Use IGMP membership reporting between the receiver and multicast router. Which corrective approach most directly addresses the original issue?

  1. Inspect the Junos IGMP snooping group table and subscriber interface memberships.
  2. Check the reverse-path-forwarding lookup against the unicast route to the source.
  3. Provide a suitable IGMP querier function on the VLAN.
  4. Use IGMP membership reporting between the receiver and multicast router.

Explanation

Correct Answer

A:

This corrective choice addresses IGMP snooping verification. The engineer can see which ports should receive group traffic after the VLAN change.

Incorrect Answers

B:

That alternative applies to RPF source interface instead. The router can identify an incoming-interface RPF failure and avoid accepting a loop-prone path.

C:

That alternative applies to IGMP querier absence instead. Membership reports can be refreshed and unused snooping state can age correctly.

D:

That alternative applies to IGMP local receiver join instead. The local router can track interested group members on the attached network.

Question 332

An enterprise network designer recommends: Inspect the Junos IGMP snooping group table and subscriber interface memberships. Which situation most clearly calls for this action?

  1. A multicast packet arrives on an interface different from the expected upstream interface toward the source.
  2. Receivers complain about missing video after a VLAN change and the access switch may have lost learned multicast member ports.
  3. An access VLAN has snooping enabled but stops refreshing its multicast receiver table because no active router sends queries.
  4. A desktop subscribes to an IPv4 multicast television group on its local subnet and the first-hop router needs to learn the membership.

Explanation

Correct Answer

B:

This case requires the IGMP snooping verification action. The engineer can see which ports should receive group traffic after the VLAN change.

Incorrect Answers

A:

This other case would be better matched to Check the reverse-path-forwarding lookup against the unicast route to the source. The router can identify an incoming-interface RPF failure and avoid accepting a loop-prone path.

C:

This other case would be better matched to Provide a suitable IGMP querier function on the VLAN. Membership reports can be refreshed and unused snooping state can age correctly.

D:

This other case would be better matched to Use IGMP membership reporting between the receiver and multicast router. The local router can track interested group members on the attached network.

Question 333

A multicast flow reaches its first-hop router but downstream hosts receive nothing, and operators need per-branch forwarding evidence. Which Junos networking action or protocol decision best addresses this requirement?

  1. Inspect multicast route state and outgoing interface lists on the affected routers.
  2. Repair the unicast route used for the source RPF lookup.
  3. Enable and verify IGMP snooping for the appropriate VLAN where supported.
  4. Use IGMPv3 source-filter membership signaling for the intended sources.

Explanation

Correct Answer

A:

This action addresses Multicast forwarding table. The troubleshooting path shows whether downstream forwarding branches exist for the selected group.

Incorrect Answers

B:

That action targets Multicast RPF unicast reachability: The expected multicast incoming interface can match the corrected route toward the source. It does not directly resolve the stated Multicast forwarding table requirement.

C:

That action targets IGMP snooping membership: Layer 2 replication can be restricted to interested receiver-facing ports. It does not directly resolve the stated Multicast forwarding table requirement.

D:

That action targets IGMPv3 source include: The host can communicate source-specific membership information to its first-hop router. It does not directly resolve the stated Multicast forwarding table requirement.

Question 334

A Junos network engineer takes this step: Inspect multicast route state and outgoing interface lists on the affected routers. Which outcome most directly follows?

  1. The host can communicate source-specific membership information to its first-hop router.
  2. The troubleshooting path shows whether downstream forwarding branches exist for the selected group.
  3. Layer 2 replication can be restricted to interested receiver-facing ports.
  4. The expected multicast incoming interface can match the corrected route toward the source.

Explanation

Correct Answer

B:

This is the direct result of the Multicast forwarding table decision: The troubleshooting path shows whether downstream forwarding branches exist for the selected group.

Incorrect Answers

A:

This outcome is associated with IGMPv3 source include (Use IGMPv3 source-filter membership signaling for the intended sources.), not the specified action.

C:

This outcome is associated with IGMP snooping membership (Enable and verify IGMP snooping for the appropriate VLAN where supported.), not the specified action.

D:

This outcome is associated with Multicast RPF unicast reachability (Repair the unicast route used for the source RPF lookup.), not the specified action.

Question 335

A multicast flow reaches its first-hop router but downstream hosts receive nothing, and operators need per-branch forwarding evidence. A colleague instead suggests: Enable and verify IGMP snooping for the appropriate VLAN where supported. Which corrective approach most directly addresses the original issue?

  1. Use IGMPv3 source-filter membership signaling for the intended sources.
  2. Enable and verify IGMP snooping for the appropriate VLAN where supported.
  3. Inspect multicast route state and outgoing interface lists on the affected routers.
  4. Repair the unicast route used for the source RPF lookup.

Explanation

Correct Answer

C:

This corrective choice addresses Multicast forwarding table. The troubleshooting path shows whether downstream forwarding branches exist for the selected group.

Incorrect Answers

A:

That alternative applies to IGMPv3 source include instead. The host can communicate source-specific membership information to its first-hop router.

B:

That alternative applies to IGMP snooping membership instead. Layer 2 replication can be restricted to interested receiver-facing ports.

D:

That alternative applies to Multicast RPF unicast reachability instead. The expected multicast incoming interface can match the corrected route toward the source.

Question 336

An enterprise network designer recommends: Inspect multicast route state and outgoing interface lists on the affected routers. Which situation most clearly calls for this action?

  1. A receiver needs to request only specific multicast sources instead of accepting all senders for a group.
  2. Multicast packets fail their RPF check because the router's unicast table points toward the source through an incorrect next hop.
  3. A Layer 2 access switch floods multicast video frames to every port even though only some ports have joined the channel.
  4. A multicast flow reaches its first-hop router but downstream hosts receive nothing, and operators need per-branch forwarding evidence.

Explanation

Correct Answer

D:

This case requires the Multicast forwarding table action. The troubleshooting path shows whether downstream forwarding branches exist for the selected group.

Incorrect Answers

A:

This other case would be better matched to Use IGMPv3 source-filter membership signaling for the intended sources. The host can communicate source-specific membership information to its first-hop router.

B:

This other case would be better matched to Repair the unicast route used for the source RPF lookup. The expected multicast incoming interface can match the corrected route toward the source.

C:

This other case would be better matched to Enable and verify IGMP snooping for the appropriate VLAN where supported. Layer 2 replication can be restricted to interested receiver-facing ports.

Question 337

A network should carry multicast streams only over branches with interested receivers rather than flooding every multicast-enabled link. 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. Use PIM Join/Prune behavior to withdraw unneeded branch state upstream.
  3. Run supported PIM sparse-mode and establish receiver-driven join state.
  4. Use a PIM SSM (S,G) join toward the known source.

Explanation

Correct Answer

C:

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

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 Sparse-mode joins requirement.

B:

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 Sparse-mode joins 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 Sparse-mode joins requirement.

Question 338

A Junos network engineer takes this step: Run supported PIM sparse-mode and establish receiver-driven join state. Which outcome most directly follows?

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

Explanation

Correct Answer

D:

This is the direct result of the Sparse-mode joins decision: Routers build multicast distribution branches in response to explicit joins.

Incorrect Answers

A:

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.

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

Question 339

A network should carry multicast streams only over branches with interested receivers rather than flooding every multicast-enabled link. A colleague instead suggests: Use PIM Join/Prune behavior to withdraw unneeded branch state upstream. Which corrective approach most directly addresses the original issue?

  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. 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 corrective choice addresses Sparse-mode joins. Routers build multicast distribution branches in response to explicit joins.

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

D:

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

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.

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