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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 29

Question 280

An enterprise network designer recommends: Use a valid any-source multicast shared-tree design with a rendezvous point. Which situation most clearly calls for this action?

  1. Several different senders publish to the same multicast group and receivers do not specify the source address.
  2. A receiver subnet has no hosts requesting a multicast channel, yet the operator expects multicast forwarding there.
  3. A new multicast source starts sending to an ASM group but receivers have joined only the RP-centered tree.
  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 shared tree action. Receivers can join the group without identifying each sender in advance.

Incorrect Answers

B:

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.

C:

This other case would be better matched to Use the PIM-SM rendezvous-point and source registration process to connect the new source to interested receivers. The ASM shared tree can discover active sources and begin delivering their 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 281

A market-data receiver must subscribe only to source 192.0.2.10 for group 232.1.1.1. Which Junos networking action or protocol decision best addresses this requirement?

  1. Allow multicast routers to replicate packets only at appropriate branch points.
  2. Use source-specific multicast join state for the selected (S,G) channel.
  3. Inspect multicast routing entries and their source/group tuple format.
  4. Use a multicast group address and appropriate multicast routing to serve subscribers.

Explanation

Correct Answer

B:

This action addresses SSM designated source. The multicast tree is built for the approved sender and group combination.

Incorrect Answers

A:

That action targets Multicast branch replication: Shared upstream links can carry one stream until the paths toward receivers diverge. It does not directly resolve the stated SSM designated source requirement.

C:

That action targets Multicast route state: The router's recorded state reveals whether forwarding is group-shared or source-specific. It does not directly resolve the stated SSM designated source requirement.

D:

That action targets Multicast group addressing: A single source stream can be replicated only where receivers have joined the group. It does not directly resolve the stated SSM designated source requirement.

Question 282

A Junos network engineer takes this step: Use source-specific multicast join state for the selected (S,G) channel. Which outcome most directly follows?

  1. The router's recorded state reveals whether forwarding is group-shared or source-specific.
  2. A single source stream can be replicated only where receivers have joined the group.
  3. The multicast tree is built for the approved sender and group combination.
  4. Shared upstream links can carry one stream until the paths toward receivers diverge.

Explanation

Correct Answer

C:

This is the direct result of the SSM designated source decision: The multicast tree is built for the approved sender and group combination.

Incorrect Answers

A:

This outcome is associated with Multicast route state (Inspect multicast routing entries and their source/group tuple format.), not the specified action.

B:

This outcome is associated with Multicast group addressing (Use a multicast group address and appropriate multicast routing to serve subscribers.), not the specified action.

D:

This outcome is associated with Multicast branch replication (Allow multicast routers to replicate packets only at appropriate branch points.), not the specified action.

Question 283

A market-data receiver must subscribe only to source 192.0.2.10 for group 232.1.1.1. A colleague instead suggests: Allow multicast routers to replicate packets only at appropriate branch points. Which corrective approach most directly addresses the original issue?

  1. Use a multicast group address and appropriate multicast routing to serve subscribers.
  2. Inspect multicast routing entries and their source/group tuple format.
  3. Allow multicast routers to replicate packets only at appropriate branch points.
  4. Use source-specific multicast join state for the selected (S,G) channel.

Explanation

Correct Answer

D:

This corrective choice addresses SSM designated source. The multicast tree is built for the approved sender and group combination.

Incorrect Answers

A:

That alternative applies to Multicast group addressing instead. A single source stream can be replicated only where receivers have joined the group.

B:

That alternative applies to Multicast route state instead. The router's recorded state reveals whether forwarding is group-shared or source-specific.

C:

That alternative applies to Multicast branch replication instead. Shared upstream links can carry one stream until the paths toward receivers diverge.

Question 284

An enterprise network designer recommends: Use source-specific multicast join state for the selected (S,G) channel. Which situation most clearly calls for this action?

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

Explanation

Correct Answer

A:

This case requires the SSM designated source action. The multicast tree is built for the approved sender and group combination.

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 Inspect multicast routing entries and their source/group tuple format. The router's recorded state reveals whether forwarding is group-shared or source-specific.

D:

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.

Question 285

A monitoring engineer confuses a normal host destination with an IPv4 multicast destination used by a streaming service. Which Junos networking action or protocol decision best addresses this requirement?

  1. Require actual receiver membership or downstream join state before forwarding a sparse-mode channel onto that branch.
  2. Use a valid any-source multicast shared-tree design with a rendezvous point.
  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

C:

This action addresses IPv4 multicast address class. The forwarding design can distinguish group destinations from unicast IP hosts.

Incorrect Answers

A:

That action targets Multicast receiver membership: Unsubscribed sparse-mode branches do not receive unnecessary multicast traffic. It does not directly resolve the stated IPv4 multicast address class requirement.

B:

That action targets ASM shared tree: Receivers can join the group without identifying each sender in advance. It does not directly resolve the stated IPv4 multicast address class requirement.

D:

That action targets ASM source discovery: The ASM shared tree can discover active sources and begin delivering their traffic. It does not directly resolve the stated IPv4 multicast address class requirement.

Question 286

A Junos network engineer takes this step: Identify destination addresses in the 224.0.0.0/4 multicast range as multicast groups. Which outcome most directly follows?

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

Explanation

Correct Answer

D:

This is the direct result of the IPv4 multicast address class decision: The forwarding design can distinguish group destinations from unicast IP hosts.

Incorrect Answers

A:

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.

B:

This outcome is associated with ASM source discovery (Use the PIM-SM rendezvous-point and source registration process to connect the new source to interested receivers.), not the specified action.

C:

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.

Question 287

A monitoring engineer confuses a normal host destination with an IPv4 multicast destination used by a streaming service. A colleague instead suggests: Require actual receiver membership or downstream join state before forwarding a sparse-mode channel onto that branch. Which corrective approach most directly addresses the original issue?

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

Explanation

Correct Answer

A:

This corrective choice addresses IPv4 multicast address class. The forwarding design can distinguish group destinations from unicast IP hosts.

Incorrect Answers

B:

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

C:

That alternative applies to ASM source discovery instead. The ASM shared tree can discover active sources and begin delivering their traffic.

D:

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

Question 288

An enterprise network designer recommends: Identify destination addresses in the 224.0.0.0/4 multicast range as multicast groups. Which situation most clearly calls for this action?

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

Explanation

Correct Answer

B:

This case requires the IPv4 multicast address class action. The forwarding design can distinguish group destinations from unicast IP hosts.

Incorrect Answers

A:

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.

C:

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.

D:

This other case would be better matched to Use the PIM-SM rendezvous-point and source registration process to connect the new source to interested receivers. The ASM shared tree can discover active sources and begin delivering their traffic.

Question 289

A source serves many remote receiver sites and its ingress link must not carry one separate full stream for every subscribed branch. Which Junos networking action or protocol decision best addresses this requirement?

  1. Use a multicast group address and appropriate multicast routing to serve subscribers.
  2. Allow multicast routers to replicate packets only at appropriate branch points.
  3. Use source-specific multicast join state for the selected (S,G) channel.
  4. Inspect multicast routing entries and their source/group tuple format.

Explanation

Correct Answer

B:

This action addresses Multicast branch replication. Shared upstream links can carry one stream until the paths toward receivers diverge.

Incorrect Answers

A:

That action targets Multicast group addressing: A single source stream can be replicated only where receivers have joined the group. It does not directly resolve the stated Multicast branch replication requirement.

C:

That action targets SSM designated source: The multicast tree is built for the approved sender and group combination. It does not directly resolve the stated Multicast branch replication requirement.

D:

That action targets Multicast route state: The router's recorded state reveals whether forwarding is group-shared or source-specific. It does not directly resolve the stated Multicast branch replication requirement.

Question 290

A Junos network engineer takes this step: Allow multicast routers to replicate packets only at appropriate branch points. Which outcome most directly follows?

  1. A single source stream can be replicated only where receivers have joined the group.
  2. The multicast tree is built for the approved sender and group combination.
  3. Shared upstream links can carry one stream until the paths toward receivers diverge.
  4. The router's recorded state reveals whether forwarding is group-shared or source-specific.

Explanation

Correct Answer

C:

This is the direct result of the Multicast branch replication decision: Shared upstream links can carry one stream until the paths toward receivers diverge.

Incorrect Answers

A:

This outcome is associated with Multicast group addressing (Use a multicast group address and appropriate multicast routing to serve subscribers.), not the specified action.

B:

This outcome is associated with SSM designated source (Use source-specific multicast join state for the selected (S,G) channel.), not the specified action.

D:

This outcome is associated with Multicast route state (Inspect multicast routing entries and their source/group tuple format.), not the specified action.

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