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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 28

Question 270

A Junos network engineer takes this step: Compare advertised and received BGP capability and family configuration on both routers. Which outcome most directly follows?

  1. Eligible BGP paths can participate in multipath forwarding instead of one chosen exit.
  2. The administrator can identify and correct a negotiated-family mismatch.
  3. The session advertises reachability in the intended IPv4 unicast address family.
  4. Excessively flapping paths can be penalized temporarily while stable routes remain available.

Explanation

Correct Answer

B:

This is the direct result of the BGP family compatibility decision: The administrator can identify and correct a negotiated-family mismatch.

Incorrect Answers

A:

This outcome is associated with BGP ECMP multipath (Configure supported BGP multipath and verify forwarding-table next-hop installation.), not the specified action.

C:

This outcome is associated with IPv4 unicast family (Use the inet unicast family for IPv4 unicast BGP exchange.), not the specified action.

D:

This outcome is associated with BGP route damping (Evaluate and implement supported BGP route dampening policy with carefully chosen suppression thresholds.), not the specified action.

Question 271

A BGP neighbor session is Established but the expected prefix family never activates after OPEN capability negotiation. A colleague instead suggests: Configure supported BGP multipath and verify forwarding-table next-hop installation. Which corrective approach most directly addresses the original issue?

  1. Use the inet unicast family for IPv4 unicast BGP exchange.
  2. Configure supported BGP multipath and verify forwarding-table next-hop installation.
  3. Compare advertised and received BGP capability and family configuration on both routers.
  4. Evaluate and implement supported BGP route dampening policy with carefully chosen suppression thresholds.

Explanation

Correct Answer

C:

This corrective choice addresses BGP family compatibility. The administrator can identify and correct a negotiated-family mismatch.

Incorrect Answers

A:

That alternative applies to IPv4 unicast family instead. The session advertises reachability in the intended IPv4 unicast address family.

B:

That alternative applies to BGP ECMP multipath instead. Eligible BGP paths can participate in multipath forwarding instead of one chosen exit.

D:

That alternative applies to BGP route damping instead. Excessively flapping paths can be penalized temporarily while stable routes remain available.

Question 272

An enterprise network designer recommends: Compare advertised and received BGP capability and family configuration on both routers. Which situation most clearly calls for this action?

  1. A router receives two eligible equal-cost BGP paths and should forward traffic across both supported next hops.
  2. An unstable external prefix flaps repeatedly and operators need a controlled mechanism to temporarily suppress the most disruptive updates.
  3. A new BGP session must exchange ordinary IPv4 unicast prefixes rather than VPN or EVPN NLRI.
  4. A BGP neighbor session is Established but the expected prefix family never activates after OPEN capability negotiation.

Explanation

Correct Answer

D:

This case requires the BGP family compatibility action. The administrator can identify and correct a negotiated-family mismatch.

Incorrect Answers

A:

This other case would be better matched to Configure supported BGP multipath and verify forwarding-table next-hop installation. Eligible BGP paths can participate in multipath forwarding instead of one chosen exit.

B:

This other case would be better matched to Evaluate and implement supported BGP route dampening policy with carefully chosen suppression thresholds. Excessively flapping paths can be penalized temporarily while stable routes remain available.

C:

This other case would be better matched to Use the inet unicast family for IPv4 unicast BGP exchange. The session advertises reachability in the intended IPv4 unicast address family.

Question 273

A sender transmits one video stream to a logical receiver group rather than maintaining a separate unicast session per viewer. Which Junos networking action or protocol decision best addresses this requirement?

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

Explanation

Correct Answer

C:

This action addresses Multicast group addressing. A single source stream can be replicated only where receivers have joined the group.

Incorrect Answers

A:

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 group addressing requirement.

B:

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 group addressing requirement.

D:

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 group addressing requirement.

Question 274

A Junos network engineer takes this step: Use a multicast group address and appropriate multicast routing to serve subscribers. Which outcome most directly follows?

  1. The router's recorded state reveals whether forwarding is group-shared or source-specific.
  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. A single source stream can be replicated only where receivers have joined the group.

Explanation

Correct Answer

D:

This is the direct result of the Multicast group addressing decision: A single source stream can be replicated only where receivers have joined the group.

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

C:

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

Question 275

A sender transmits one video stream to a logical receiver group rather than maintaining a separate unicast session per viewer. A colleague instead suggests: Use source-specific multicast join state for the selected (S,G) channel. 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

A:

This corrective choice addresses Multicast group addressing. A single source stream can be replicated only where receivers have joined the group.

Incorrect Answers

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.

D:

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

Question 276

An enterprise network designer recommends: Use a multicast group address and appropriate multicast routing to serve subscribers. 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 sender transmits one video stream to a logical receiver group rather than maintaining a separate unicast session per viewer.
  3. A market-data receiver must subscribe only to source 192.0.2.10 for group 232.1.1.1.
  4. A source serves many remote receiver sites and its ingress link must not carry one separate full stream for every subscribed branch.

Explanation

Correct Answer

B:

This case requires the Multicast group addressing action. A single source stream can be replicated only where receivers have joined the group.

Incorrect Answers

A:

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 source-specific multicast join state for the selected (S,G) channel. The multicast tree is built for the approved sender and group combination.

D:

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.

Question 277

Several different senders publish to the same multicast group and receivers do not specify the source address. 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

B:

This action addresses ASM shared tree. Receivers can join the group without identifying each sender in advance.

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 ASM shared tree 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 ASM shared tree 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 ASM shared tree requirement.

Question 278

A Junos network engineer takes this step: Use a valid any-source multicast shared-tree design with a rendezvous point. Which outcome most directly follows?

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

Explanation

Correct Answer

C:

This is the direct result of the ASM shared tree decision: Receivers can join the group without identifying each sender in advance.

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 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.

D:

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.

Question 279

Several different senders publish to the same multicast group and receivers do not specify the source address. A colleague instead suggests: Identify destination addresses in the 224.0.0.0/4 multicast range as multicast groups. Which corrective approach most directly addresses the original issue?

  1. Use the PIM-SM rendezvous-point and source registration process to connect the new source to interested receivers.
  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 a valid any-source multicast shared-tree design with a rendezvous point.

Explanation

Correct Answer

D:

This corrective choice addresses ASM shared tree. Receivers can join the group without identifying each sender in advance.

Incorrect Answers

A:

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

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 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.

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