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Exam Code: JN0-650

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

Certification Provider: Juniper

Corresponding Certification: JNCIP-ENT

Questions & Answers

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Juniper JN0-650 Practice Test 33

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.

Question 321

A multicast packet arrives on an interface different from the expected upstream interface toward the source. 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. Check the reverse-path-forwarding lookup against the unicast route to the source.
  4. Inspect the Junos IGMP snooping group table and subscriber interface memberships.

Explanation

Correct Answer

C:

This action addresses RPF source interface. The router can identify an incoming-interface RPF failure and avoid accepting a loop-prone path.

Incorrect Answers

A:

That action targets IGMP querier absence: Membership reports can be refreshed and unused snooping state can age correctly. It does not directly resolve the stated RPF source interface requirement.

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 RPF source interface requirement.

D:

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 RPF source interface requirement.

Question 322

A Junos network engineer takes this step: Check the reverse-path-forwarding lookup against the unicast route to the source. Which outcome most directly follows?

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

Explanation

Correct Answer

D:

This is the direct result of the RPF source interface decision: The router can identify an incoming-interface RPF failure and avoid accepting a loop-prone path.

Incorrect Answers

A:

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

B:

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 IGMP querier absence (Provide a suitable IGMP querier function on the VLAN.), not the specified action.

Question 323

A multicast packet arrives on an interface different from the expected upstream interface toward the source. A colleague instead suggests: Inspect the Junos IGMP snooping group table and subscriber interface memberships. Which corrective approach most directly addresses the original issue?

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

Explanation

Correct Answer

A:

This corrective choice addresses RPF source interface. The router can identify an incoming-interface RPF failure and avoid accepting a loop-prone path.

Incorrect Answers

B:

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

C:

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

D:

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

Question 324

An enterprise network designer recommends: Check the reverse-path-forwarding lookup against the unicast route to the source. Which situation most clearly calls for this action?

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

Explanation

Correct Answer

B:

This case requires the RPF source interface action. The router can identify an incoming-interface RPF failure and avoid accepting a loop-prone path.

Incorrect Answers

A:

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.

C:

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.

D:

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.

Question 325

Multicast packets fail their RPF check because the router's unicast table points toward the source through an incorrect next hop. Which Junos networking action or protocol decision best addresses this requirement?

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

Explanation

Correct Answer

A:

This action addresses Multicast RPF unicast reachability. The expected multicast incoming interface can match the corrected route toward the source.

Incorrect Answers

B:

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 RPF unicast reachability requirement.

C:

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 Multicast RPF unicast reachability requirement.

D:

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 RPF unicast reachability requirement.

Question 326

A Junos network engineer takes this step: Repair the unicast route used for the source RPF lookup. Which outcome most directly follows?

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

Explanation

Correct Answer

B:

This is the direct result of the Multicast RPF unicast reachability decision: The expected multicast incoming interface can match the corrected route toward the source.

Incorrect Answers

A:

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

C:

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 327

Multicast packets fail their RPF check because the router's unicast table points toward the source through an incorrect next hop. A colleague instead suggests: Inspect multicast route state and outgoing interface lists on the affected routers. Which corrective approach most directly addresses the original issue?

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

Explanation

Correct Answer

C:

This corrective choice addresses Multicast RPF unicast reachability. The expected multicast incoming interface can match the corrected route toward the source.

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

D:

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

Question 328

An enterprise network designer recommends: Repair the unicast route used for the source RPF lookup. Which situation most clearly calls for this action?

  1. A multicast flow reaches its first-hop router but downstream hosts receive nothing, and operators need per-branch forwarding evidence.
  2. A Layer 2 access switch floods multicast video frames to every port even though only some ports have joined the channel.
  3. A receiver needs to request only specific multicast sources instead of accepting all senders for a group.
  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

D:

This case requires the Multicast RPF unicast reachability action. The expected multicast incoming interface can match the corrected route toward the source.

Incorrect Answers

A:

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.

B:

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.

C:

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.

Question 329

Receivers complain about missing video after a VLAN change and the access switch may have lost learned multicast member ports. Which Junos networking action or protocol decision best addresses this requirement?

  1. Use IGMP membership reporting between the receiver and multicast router.
  2. Provide a suitable IGMP querier function on the VLAN.
  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

C:

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

Incorrect Answers

A:

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 snooping verification requirement.

B:

That action targets IGMP querier absence: Membership reports can be refreshed and unused snooping state can age correctly. It does not directly resolve the stated IGMP snooping verification 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 snooping verification requirement.

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.

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