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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 27

Question 260

An enterprise network designer recommends: Configure and negotiate four-octet AS number support on the BGP peer. Which situation most clearly calls for this action?

  1. A route reflector must propagate more than its single selected best path to support diverse client path choices.
  2. A transit provider operates with an autonomous system number beyond the traditional two-byte AS range.
  3. A route-reflector client receives a reflected BGP route that risks looping back through its own originator ID.
  4. A Junos speaker learns IPv4 BGP routes but an IPv6 peer must exchange inet6 unicast network prefixes.

Explanation

Correct Answer

B:

This case requires the Four-octet AS number action. The session can represent modern 32-bit AS numbers instead of truncating them.

Incorrect Answers

A:

This other case would be better matched to Enable supported BGP add-path advertisement for the chosen family and peers. Additional eligible path identifiers can be communicated rather than only the active best path.

C:

This other case would be better matched to Use BGP route-reflection originator-ID and cluster-list loop prevention behavior. Reflected paths that indicate looping are not accepted as fresh reachability.

D:

This other case would be better matched to Enable the appropriate inet6 BGP NLRI family on the configured session. The peers can advertise and receive IPv6 unicast routing information.

Question 261

An unstable external prefix flaps repeatedly and operators need a controlled mechanism to temporarily suppress the most disruptive updates. Which Junos networking action or protocol decision best addresses this requirement?

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

Explanation

Correct Answer

D:

This action addresses BGP route damping. Excessively flapping paths can be penalized temporarily while stable routes remain available.

Incorrect Answers

A:

That action targets IPv4 unicast family: The session advertises reachability in the intended IPv4 unicast address family. It does not directly resolve the stated BGP route damping requirement.

B:

That action targets BGP family compatibility: The administrator can identify and correct a negotiated-family mismatch. It does not directly resolve the stated BGP route damping requirement.

C:

That action targets BGP ECMP multipath: Eligible BGP paths can participate in multipath forwarding instead of one chosen exit. It does not directly resolve the stated BGP route damping requirement.

Question 262

A Junos network engineer takes this step: Evaluate and implement supported BGP route dampening policy with carefully chosen suppression thresholds. Which outcome most directly follows?

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

Explanation

Correct Answer

A:

This is the direct result of the BGP route damping decision: Excessively flapping paths can be penalized temporarily while stable routes remain available.

Incorrect Answers

B:

This outcome is associated with BGP family compatibility (Compare advertised and received BGP capability and family configuration on both routers.), 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 ECMP multipath (Configure supported BGP multipath and verify forwarding-table next-hop installation.), not the specified action.

Question 263

An unstable external prefix flaps repeatedly and operators need a controlled mechanism to temporarily suppress the most disruptive updates. A colleague instead suggests: Compare advertised and received BGP capability and family configuration on both routers. Which corrective approach most directly addresses the original issue?

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

Explanation

Correct Answer

B:

This corrective choice addresses BGP route damping. Excessively flapping paths can be penalized temporarily while stable routes remain available.

Incorrect Answers

A:

That alternative applies to BGP family compatibility instead. The administrator can identify and correct a negotiated-family mismatch.

C:

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

D:

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

Question 264

An enterprise network designer recommends: Evaluate and implement supported BGP route dampening policy with carefully chosen suppression thresholds. 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. A new BGP session must exchange ordinary IPv4 unicast prefixes rather than VPN or EVPN NLRI.
  3. An unstable external prefix flaps repeatedly and operators need a controlled mechanism to temporarily suppress the most disruptive updates.
  4. A BGP neighbor session is Established but the expected prefix family never activates after OPEN capability negotiation.

Explanation

Correct Answer

C:

This case requires the BGP route damping action. Excessively flapping paths can be penalized temporarily while stable routes remain available.

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 Use the inet unicast family for IPv4 unicast BGP exchange. The session advertises reachability in the intended IPv4 unicast address family.

D:

This other case would be better matched to Compare advertised and received BGP capability and family configuration on both routers. The administrator can identify and correct a negotiated-family mismatch.

Question 265

A route reflector must propagate more than its single selected best path to support diverse client path choices. Which Junos networking action or protocol decision best addresses this requirement?

  1. Enable supported BGP add-path advertisement for the chosen family and peers.
  2. Configure and negotiate four-octet AS number support on the BGP peer.
  3. Use BGP route-reflection originator-ID and cluster-list loop prevention behavior.
  4. Enable the appropriate inet6 BGP NLRI family on the configured session.

Explanation

Correct Answer

A:

This action addresses BGP additional paths. Additional eligible path identifiers can be communicated rather than only the active best path.

Incorrect Answers

B:

That action targets Four-octet AS number: The session can represent modern 32-bit AS numbers instead of truncating them. It does not directly resolve the stated BGP additional paths requirement.

C:

That action targets Route-reflector loop control: Reflected paths that indicate looping are not accepted as fresh reachability. It does not directly resolve the stated BGP additional paths requirement.

D:

That action targets IPv6 BGP NLRI family: The peers can advertise and receive IPv6 unicast routing information. It does not directly resolve the stated BGP additional paths requirement.

Question 266

A Junos network engineer takes this step: Enable supported BGP add-path advertisement for the chosen family and peers. Which outcome most directly follows?

  1. The peers can advertise and receive IPv6 unicast routing information.
  2. Additional eligible path identifiers can be communicated rather than only the active best path.
  3. The session can represent modern 32-bit AS numbers instead of truncating them.
  4. Reflected paths that indicate looping are not accepted as fresh reachability.

Explanation

Correct Answer

B:

This is the direct result of the BGP additional paths decision: Additional eligible path identifiers can be communicated rather than only the active best path.

Incorrect Answers

A:

This outcome is associated with IPv6 BGP NLRI family (Enable the appropriate inet6 BGP NLRI family on the configured session.), not the specified action.

C:

This outcome is associated with Four-octet AS number (Configure and negotiate four-octet AS number support on the BGP peer.), not the specified action.

D:

This outcome is associated with Route-reflector loop control (Use BGP route-reflection originator-ID and cluster-list loop prevention behavior.), not the specified action.

Question 267

A route reflector must propagate more than its single selected best path to support diverse client path choices. A colleague instead suggests: Enable the appropriate inet6 BGP NLRI family on the configured session. Which corrective approach most directly addresses the original issue?

  1. Enable the appropriate inet6 BGP NLRI family on the configured session.
  2. Use BGP route-reflection originator-ID and cluster-list loop prevention behavior.
  3. Enable supported BGP add-path advertisement for the chosen family and peers.
  4. Configure and negotiate four-octet AS number support on the BGP peer.

Explanation

Correct Answer

C:

This corrective choice addresses BGP additional paths. Additional eligible path identifiers can be communicated rather than only the active best path.

Incorrect Answers

A:

That alternative applies to IPv6 BGP NLRI family instead. The peers can advertise and receive IPv6 unicast routing information.

B:

That alternative applies to Route-reflector loop control instead. Reflected paths that indicate looping are not accepted as fresh reachability.

D:

That alternative applies to Four-octet AS number instead. The session can represent modern 32-bit AS numbers instead of truncating them.

Question 268

An enterprise network designer recommends: Enable supported BGP add-path advertisement for the chosen family and peers. Which situation most clearly calls for this action?

  1. A Junos speaker learns IPv4 BGP routes but an IPv6 peer must exchange inet6 unicast network prefixes.
  2. A route-reflector client receives a reflected BGP route that risks looping back through its own originator ID.
  3. A transit provider operates with an autonomous system number beyond the traditional two-byte AS range.
  4. A route reflector must propagate more than its single selected best path to support diverse client path choices.

Explanation

Correct Answer

D:

This case requires the BGP additional paths action. Additional eligible path identifiers can be communicated rather than only the active best path.

Incorrect Answers

A:

This other case would be better matched to Enable the appropriate inet6 BGP NLRI family on the configured session. The peers can advertise and receive IPv6 unicast routing information.

B:

This other case would be better matched to Use BGP route-reflection originator-ID and cluster-list loop prevention behavior. Reflected paths that indicate looping are not accepted as fresh reachability.

C:

This other case would be better matched to Configure and negotiate four-octet AS number support on the BGP peer. The session can represent modern 32-bit AS numbers instead of truncating them.

Question 269

A BGP neighbor session is Established but the expected prefix family never activates after OPEN capability negotiation. Which Junos networking action or protocol decision best addresses this requirement?

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

Explanation

Correct Answer

A:

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

Incorrect Answers

B:

That action targets IPv4 unicast family: The session advertises reachability in the intended IPv4 unicast address family. It does not directly resolve the stated BGP family compatibility requirement.

C:

That action targets BGP ECMP multipath: Eligible BGP paths can participate in multipath forwarding instead of one chosen exit. It does not directly resolve the stated BGP family compatibility requirement.

D:

That action targets BGP route damping: Excessively flapping paths can be penalized temporarily while stable routes remain available. It does not directly resolve the stated BGP family compatibility requirement.

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.

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