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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 31

Question 300

An enterprise network designer recommends: Inspect multicast routing entries and their source/group tuple format. Which situation most clearly calls for this action?

  1. An engineer must distinguish a shared (*,G) multicast tree from a source-specific (S,G) state on a Junos router.
  2. A source serves many remote receiver sites and its ingress link must not carry one separate full stream for every subscribed branch.
  3. A sender transmits one video stream to a logical receiver group rather than maintaining a separate unicast session per viewer.
  4. A market-data receiver must subscribe only to source 192.0.2.10 for group 232.1.1.1.

Explanation

Correct Answer

A:

This case requires the Multicast route state action. The router's recorded state reveals whether forwarding is group-shared or source-specific.

Incorrect Answers

B:

This other case would be better matched to Allow multicast routers to replicate packets only at appropriate branch points. Shared upstream links can carry one stream until the paths toward receivers diverge.

C:

This other case would be better matched to Use a multicast group address and appropriate multicast routing to serve subscribers. A single source stream can be replicated only where receivers have joined the group.

D:

This other case would be better matched to Use source-specific multicast join state for the selected (S,G) channel. The multicast tree is built for the approved sender and group combination.

Question 301

A new multicast source starts sending to an ASM group but receivers have joined only the RP-centered tree. Which Junos networking action or protocol decision best addresses this requirement?

  1. Use a valid any-source multicast shared-tree design with a rendezvous point.
  2. Use the PIM-SM rendezvous-point and source registration process to connect the new source to interested receivers.
  3. Require actual receiver membership or downstream join state before forwarding a sparse-mode channel onto that branch.
  4. Identify destination addresses in the 224.0.0.0/4 multicast range as multicast groups.

Explanation

Correct Answer

B:

This action addresses ASM source discovery. The ASM shared tree can discover active sources and begin delivering their traffic.

Incorrect Answers

A:

That action targets ASM shared tree: Receivers can join the group without identifying each sender in advance. It does not directly resolve the stated ASM source discovery requirement.

C:

That action targets Multicast receiver membership: Unsubscribed sparse-mode branches do not receive unnecessary multicast traffic. It does not directly resolve the stated ASM source discovery requirement.

D:

That action targets IPv4 multicast address class: The forwarding design can distinguish group destinations from unicast IP hosts. It does not directly resolve the stated ASM source discovery requirement.

Question 302

A Junos network engineer takes this step: Use the PIM-SM rendezvous-point and source registration process to connect the new source to interested receivers. Which outcome most directly follows?

  1. Unsubscribed sparse-mode branches do not receive unnecessary multicast traffic.
  2. The forwarding design can distinguish group destinations from unicast IP hosts.
  3. The ASM shared tree can discover active sources and begin delivering their traffic.
  4. Receivers can join the group without identifying each sender in advance.

Explanation

Correct Answer

C:

This is the direct result of the ASM source discovery decision: The ASM shared tree can discover active sources and begin delivering their traffic.

Incorrect Answers

A:

This outcome is associated with Multicast receiver membership (Require actual receiver membership or downstream join state before forwarding a sparse-mode channel onto that branch.), not the specified action.

B:

This outcome is associated with IPv4 multicast address class (Identify destination addresses in the 224.0.0.0/4 multicast range as multicast groups.), not the specified action.

D:

This outcome is associated with ASM shared tree (Use a valid any-source multicast shared-tree design with a rendezvous point.), not the specified action.

Question 303

A new multicast source starts sending to an ASM group but receivers have joined only the RP-centered tree. A colleague instead suggests: Use a valid any-source multicast shared-tree design with a rendezvous point. Which corrective approach most directly addresses the original issue?

  1. Use a valid any-source multicast shared-tree design with a rendezvous point.
  2. Require actual receiver membership or downstream join state before forwarding a sparse-mode channel onto that branch.
  3. Identify destination addresses in the 224.0.0.0/4 multicast range as multicast groups.
  4. Use the PIM-SM rendezvous-point and source registration process to connect the new source to interested receivers.

Explanation

Correct Answer

D:

This corrective choice addresses ASM source discovery. The ASM shared tree can discover active sources and begin delivering their traffic.

Incorrect Answers

A:

That alternative applies to ASM shared tree instead. Receivers can join the group without identifying each sender in advance.

B:

That alternative applies to Multicast receiver membership instead. Unsubscribed sparse-mode branches do not receive unnecessary multicast traffic.

C:

That alternative applies to IPv4 multicast address class instead. The forwarding design can distinguish group destinations from unicast IP hosts.

Question 304

An enterprise network designer recommends: Use the PIM-SM rendezvous-point and source registration process to connect the new source to interested receivers. Which situation most clearly calls for this action?

  1. A new multicast source starts sending to an ASM group but receivers have joined only the RP-centered tree.
  2. Several different senders publish to the same multicast group and receivers do not specify the source address.
  3. A receiver subnet has no hosts requesting a multicast channel, yet the operator expects multicast forwarding there.
  4. A monitoring engineer confuses a normal host destination with an IPv4 multicast destination used by a streaming service.

Explanation

Correct Answer

A:

This case requires the ASM source discovery action. The ASM shared tree can discover active sources and begin delivering their traffic.

Incorrect Answers

B:

This other case would be better matched to Use a valid any-source multicast shared-tree design with a rendezvous point. Receivers can join the group without identifying each sender in advance.

C:

This other case would be better matched to Require actual receiver membership or downstream join state before forwarding a sparse-mode channel onto that branch. Unsubscribed sparse-mode branches do not receive unnecessary multicast traffic.

D:

This other case would be better matched to Identify destination addresses in the 224.0.0.0/4 multicast range as multicast groups. The forwarding design can distinguish group destinations from unicast IP hosts.

Question 305

A desktop subscribes to an IPv4 multicast television group on its local subnet and the first-hop router needs to learn the membership. Which Junos networking action or protocol decision best addresses this requirement?

  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

A:

This action addresses IGMP local receiver join. The local router can track interested group members on the attached network.

Incorrect Answers

B:

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 local receiver join requirement.

C:

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 local receiver join 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 IGMP local receiver join requirement.

Question 306

A Junos network engineer takes this step: Use IGMP membership reporting between the receiver and multicast router. Which outcome most directly follows?

  1. The engineer can see which ports should receive group traffic after the VLAN change.
  2. The local router can track interested group members on the attached network.
  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

B:

This is the direct result of the IGMP local receiver join decision: The local router can track interested group members on the attached network.

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

D:

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.

Question 307

A desktop subscribes to an IPv4 multicast television group on its local subnet and the first-hop router needs to learn the membership. A colleague instead suggests: Provide a suitable IGMP querier function on the VLAN. Which corrective approach most directly addresses the original issue?

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

Explanation

Correct Answer

C:

This corrective choice addresses IGMP local receiver join. The local router can track interested group members on the attached network.

Incorrect Answers

A:

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

B:

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

Question 308

An enterprise network designer recommends: Use IGMP membership reporting between the receiver and multicast router. 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

D:

This case requires the IGMP local receiver join action. The local router can track interested group members on the attached network.

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 Provide a suitable IGMP querier function on the VLAN. Membership reports can be refreshed and unused snooping state can age correctly.

Question 309

A Layer 2 access switch floods multicast video frames to every port even though only some ports have joined the channel. Which Junos networking action or protocol decision best addresses this requirement?

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

Explanation

Correct Answer

B:

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

Incorrect Answers

A:

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 IGMP snooping membership requirement.

C:

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 IGMP snooping membership 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 IGMP snooping membership requirement.

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.

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