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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 30

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.

Question 291

A source serves many remote receiver sites and its ingress link must not carry one separate full stream for every subscribed branch. A colleague instead suggests: Inspect multicast routing entries and their source/group tuple format. 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. Use source-specific multicast join state for the selected (S,G) channel.
  4. Allow multicast routers to replicate packets only at appropriate branch points.

Explanation

Correct Answer

D:

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

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

Question 292

An enterprise network designer recommends: Allow multicast routers to replicate packets only at appropriate branch points. Which situation most clearly calls for this action?

  1. A source serves many remote receiver sites and its ingress link must not carry one separate full stream for every subscribed branch.
  2. An engineer must distinguish a shared (*,G) multicast tree from a source-specific (S,G) state on a Junos router.
  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 branch replication action. Shared upstream links can carry one stream until the paths toward receivers diverge.

Incorrect Answers

B:

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.

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 293

A receiver subnet has no hosts requesting a multicast channel, yet the operator expects multicast forwarding there. 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

A:

This action addresses Multicast receiver membership. Unsubscribed sparse-mode branches do not receive unnecessary multicast traffic.

Incorrect Answers

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 Multicast receiver membership requirement.

C:

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 Multicast receiver membership 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 Multicast receiver membership requirement.

Question 294

A Junos network engineer takes this step: Require actual receiver membership or downstream join state before forwarding a sparse-mode channel onto that branch. Which outcome most directly follows?

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

Explanation

Correct Answer

B:

This is the direct result of the Multicast receiver membership decision: Unsubscribed sparse-mode branches do not receive unnecessary multicast traffic.

Incorrect Answers

A:

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.

C:

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.

D:

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.

Question 295

A receiver subnet has no hosts requesting a multicast channel, yet the operator expects multicast forwarding there. A colleague instead suggests: Use the PIM-SM rendezvous-point and source registration process to connect the new source to interested receivers. Which corrective approach most directly addresses the original issue?

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

Explanation

Correct Answer

C:

This corrective choice addresses Multicast receiver membership. Unsubscribed sparse-mode branches do not receive unnecessary multicast 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 IPv4 multicast address class instead. The forwarding design can distinguish group destinations from unicast IP hosts.

D:

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

Question 296

An enterprise network designer recommends: Require actual receiver membership or downstream join state before forwarding a sparse-mode channel onto that branch. 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 monitoring engineer confuses a normal host destination with an IPv4 multicast destination used by a streaming service.
  3. A new multicast source starts sending to an ASM group but receivers have joined only the RP-centered tree.
  4. A receiver subnet has no hosts requesting a multicast channel, yet the operator expects multicast forwarding there.

Explanation

Correct Answer

D:

This case requires the Multicast receiver membership action. Unsubscribed sparse-mode branches do not receive unnecessary multicast traffic.

Incorrect Answers

A:

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.

B:

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.

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.

Question 297

An engineer must distinguish a shared (*,G) multicast tree from a source-specific (S,G) state on a Junos router. 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. Inspect multicast routing entries and their source/group tuple format.
  3. Use source-specific multicast join state for the selected (S,G) channel.
  4. Allow multicast routers to replicate packets only at appropriate branch points.

Explanation

Correct Answer

B:

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

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 route state 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 route state requirement.

D:

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 Multicast route state requirement.

Question 298

A Junos network engineer takes this step: Inspect multicast routing entries and their source/group tuple format. Which outcome most directly follows?

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

Explanation

Correct Answer

C:

This is the direct result of the Multicast route state decision: The router's recorded state reveals whether forwarding is group-shared or source-specific.

Incorrect Answers

A:

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

B:

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

D:

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

Question 299

An engineer must distinguish a shared (*,G) multicast tree from a source-specific (S,G) state on a Junos router. A colleague instead suggests: Use a multicast group address and appropriate multicast routing to serve subscribers. Which corrective approach most directly addresses the original issue?

  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. Use a multicast group address and appropriate multicast routing to serve subscribers.
  4. Inspect multicast routing entries and their source/group tuple format.

Explanation

Correct Answer

D:

This corrective choice addresses Multicast route state. The router's recorded state reveals whether forwarding is group-shared or source-specific.

Incorrect Answers

A:

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

B:

That alternative applies to SSM designated source instead. The multicast tree is built for the approved sender and group combination.

C:

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

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.

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