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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 32

Question 310

A Junos network engineer takes this step: Enable and verify IGMP snooping for the appropriate VLAN where supported. Which outcome most directly follows?

  1. The expected multicast incoming interface can match the corrected route toward the source.
  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 host can communicate source-specific membership information to its first-hop router.

Explanation

Correct Answer

C:

This is the direct result of the IGMP snooping membership decision: Layer 2 replication can be restricted to interested receiver-facing ports.

Incorrect Answers

A:

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

B:

This outcome is associated with Multicast forwarding table (Inspect multicast route state and outgoing interface lists on the affected routers.), not the specified action.

D:

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

Question 311

A Layer 2 access switch floods multicast video frames to every port even though only some ports have joined the channel. A colleague instead suggests: Use IGMPv3 source-filter membership signaling for the intended sources. Which corrective approach most directly addresses the original issue?

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

Explanation

Correct Answer

D:

This corrective choice addresses IGMP snooping membership. Layer 2 replication can be restricted to interested receiver-facing ports.

Incorrect Answers

A:

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

B:

That alternative applies to Multicast forwarding table instead. The troubleshooting path shows whether downstream forwarding branches exist for the selected group.

C:

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

Question 312

An enterprise network designer recommends: Enable and verify IGMP snooping for the appropriate VLAN where supported. Which situation most clearly calls for this action?

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

Explanation

Correct Answer

A:

This case requires the IGMP snooping membership action. Layer 2 replication can be restricted to interested receiver-facing ports.

Incorrect Answers

B:

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.

C:

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.

D:

This other case would be better matched to Inspect multicast route state and outgoing interface lists on the affected routers. The troubleshooting path shows whether downstream forwarding branches exist for the selected group.

Question 313

An access VLAN has snooping enabled but stops refreshing its multicast receiver table because no active router sends queries. Which Junos networking action or protocol decision best addresses this requirement?

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

Explanation

Correct Answer

A:

This action addresses IGMP querier absence. Membership reports can be refreshed and unused snooping state can age correctly.

Incorrect Answers

B:

That action targets IGMP local receiver join: The local router can track interested group members on the attached network. It does not directly resolve the stated IGMP querier absence requirement.

C:

That action targets IGMP snooping verification: The engineer can see which ports should receive group traffic after the VLAN change. It does not directly resolve the stated IGMP querier absence requirement.

D:

That action targets RPF source interface: The router can identify an incoming-interface RPF failure and avoid accepting a loop-prone path. It does not directly resolve the stated IGMP querier absence requirement.

Question 314

A Junos network engineer takes this step: Provide a suitable IGMP querier function on the VLAN. Which outcome most directly follows?

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

Explanation

Correct Answer

B:

This is the direct result of the IGMP querier absence decision: Membership reports can be refreshed and unused snooping state can age correctly.

Incorrect Answers

A:

This outcome is associated with IGMP snooping verification (Inspect the Junos IGMP snooping group table and subscriber interface memberships.), not the specified action.

C:

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.

D:

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

Question 315

An access VLAN has snooping enabled but stops refreshing its multicast receiver table because no active router sends queries. A colleague instead suggests: Check the reverse-path-forwarding lookup against the unicast route to the source. Which corrective approach most directly addresses the original issue?

  1. Use IGMP membership reporting between the receiver and multicast router.
  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. Inspect the Junos IGMP snooping group table and subscriber interface memberships.

Explanation

Correct Answer

C:

This corrective choice addresses IGMP querier absence. Membership reports can be refreshed and unused snooping state can age correctly.

Incorrect Answers

A:

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

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.

D:

That alternative applies to IGMP snooping verification instead. The engineer can see which ports should receive group traffic after the VLAN change.

Question 316

An enterprise network designer recommends: Provide a suitable IGMP querier function on the VLAN. 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. A desktop subscribes to an IPv4 multicast television group on its local subnet and the first-hop router needs to learn the membership.
  4. An access VLAN has snooping enabled but stops refreshing its multicast receiver table because no active router sends queries.

Explanation

Correct Answer

D:

This case requires the IGMP querier absence action. Membership reports can be refreshed and unused snooping state can age correctly.

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.

B:

This other case would be better matched to Inspect the Junos IGMP snooping group table and subscriber interface memberships. The engineer can see which ports should receive group traffic after the VLAN change.

C:

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 317

A receiver needs to request only specific multicast sources instead of accepting all senders for a group. Which Junos networking action or protocol decision best addresses this requirement?

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

Explanation

Correct Answer

B:

This action addresses IGMPv3 source include. The host can communicate source-specific membership information to its first-hop router.

Incorrect Answers

A:

That action targets IGMP snooping membership: Layer 2 replication can be restricted to interested receiver-facing ports. It does not directly resolve the stated IGMPv3 source include requirement.

C:

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 IGMPv3 source include requirement.

D:

That action targets Multicast forwarding table: The troubleshooting path shows whether downstream forwarding branches exist for the selected group. It does not directly resolve the stated IGMPv3 source include requirement.

Question 318

A Junos network engineer takes this step: Use IGMPv3 source-filter membership signaling for the intended sources. Which outcome most directly follows?

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

Explanation

Correct Answer

C:

This is the direct result of the IGMPv3 source include decision: The host can communicate source-specific membership information to its first-hop router.

Incorrect Answers

A:

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

B:

This outcome is associated with Multicast forwarding table (Inspect multicast route state and outgoing interface lists on the affected routers.), not the specified action.

D:

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

Question 319

A receiver needs to request only specific multicast sources instead of accepting all senders for a group. A colleague instead suggests: Repair the unicast route used for the source RPF lookup. Which corrective approach most directly addresses the original issue?

  1. Repair the unicast route used for the source RPF lookup.
  2. Inspect multicast route state and outgoing interface lists on the affected routers.
  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

D:

This corrective choice addresses IGMPv3 source include. The host can communicate source-specific membership information to its first-hop router.

Incorrect Answers

A:

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

B:

That alternative applies to Multicast forwarding table instead. The troubleshooting path shows whether downstream forwarding branches exist for the selected group.

C:

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

Question 320

An enterprise network designer recommends: Use IGMPv3 source-filter membership signaling for the intended sources. 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. A multicast flow reaches its first-hop router but downstream hosts receive nothing, and operators need per-branch forwarding evidence.
  3. A Layer 2 access switch floods multicast video frames to every port even though only some ports have joined the channel.
  4. Multicast packets fail their RPF check because the router's unicast table points toward the source through an incorrect next hop.

Explanation

Correct Answer

A:

This case requires the IGMPv3 source include action. The host can communicate source-specific membership information to its first-hop router.

Incorrect Answers

B:

This other case would be better matched to Inspect multicast route state and outgoing interface lists on the affected routers. The troubleshooting path shows whether downstream forwarding branches exist for the selected group.

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.

D:

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.

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