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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 26

Question 250

A Junos network engineer takes this step: Use BGP route-reflection originator-ID and cluster-list loop prevention behavior. Which outcome most directly follows?

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

Explanation

Correct Answer

C:

This is the direct result of the Route-reflector loop control decision: Reflected paths that indicate looping are not accepted as fresh reachability.

Incorrect Answers

A:

This outcome is associated with BGP additional paths (Enable supported BGP add-path advertisement for the chosen family and peers.), not the specified action.

B:

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

D:

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.

Question 251

A route-reflector client receives a reflected BGP route that risks looping back through its own originator ID. A colleague instead suggests: Configure and negotiate four-octet AS number support on the BGP peer. Which corrective approach most directly addresses the original issue?

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

Explanation

Correct Answer

D:

This corrective choice addresses Route-reflector loop control. Reflected paths that indicate looping are not accepted as fresh reachability.

Incorrect Answers

A:

That alternative applies to BGP additional paths instead. Additional eligible path identifiers can be communicated rather than only the active best path.

B:

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

C:

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

Question 252

An enterprise network designer recommends: Use BGP route-reflection originator-ID and cluster-list loop prevention behavior. Which situation most clearly calls for this action?

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

Explanation

Correct Answer

A:

This case requires the Route-reflector loop control action. Reflected paths that indicate looping are not accepted as fresh reachability.

Incorrect Answers

B:

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.

C:

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.

D:

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 253

A new BGP session must exchange ordinary IPv4 unicast prefixes rather than VPN or EVPN NLRI. Which Junos networking action or protocol decision best addresses this requirement?

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

Explanation

Correct Answer

A:

This action addresses IPv4 unicast family. The session advertises reachability in the intended IPv4 unicast address family.

Incorrect Answers

B:

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 IPv4 unicast family requirement.

C:

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 IPv4 unicast family requirement.

D:

That action targets BGP family compatibility: The administrator can identify and correct a negotiated-family mismatch. It does not directly resolve the stated IPv4 unicast family requirement.

Question 254

A Junos network engineer takes this step: Use the inet unicast family for IPv4 unicast BGP exchange. Which outcome most directly follows?

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

Explanation

Correct Answer

B:

This is the direct result of the IPv4 unicast family decision: The session advertises reachability in the intended IPv4 unicast address family.

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

D:

This outcome is associated with BGP family compatibility (Compare advertised and received BGP capability and family configuration on both routers.), not the specified action.

Question 255

A new BGP session must exchange ordinary IPv4 unicast prefixes rather than VPN or EVPN NLRI. A colleague instead suggests: Evaluate and implement supported BGP route dampening policy with carefully chosen suppression thresholds. Which corrective approach most directly addresses the original issue?

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

Explanation

Correct Answer

C:

This corrective choice addresses IPv4 unicast family. The session advertises reachability in the intended IPv4 unicast address family.

Incorrect Answers

A:

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

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 family compatibility instead. The administrator can identify and correct a negotiated-family mismatch.

Question 256

An enterprise network designer recommends: Use the inet unicast family for IPv4 unicast BGP exchange. Which situation most clearly calls for this action?

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

Explanation

Correct Answer

D:

This case requires the IPv4 unicast family action. The session advertises reachability in the intended IPv4 unicast address family.

Incorrect Answers

A:

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.

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 Configure supported BGP multipath and verify forwarding-table next-hop installation. Eligible BGP paths can participate in multipath forwarding instead of one chosen exit.

Question 257

A transit provider operates with an autonomous system number beyond the traditional two-byte AS range. Which Junos networking action or protocol decision best addresses this requirement?

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

Explanation

Correct Answer

C:

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

Incorrect Answers

A:

That action targets IPv6 BGP NLRI family: The peers can advertise and receive IPv6 unicast routing information. It does not directly resolve the stated Four-octet AS number requirement.

B:

That action targets BGP additional paths: Additional eligible path identifiers can be communicated rather than only the active best path. It does not directly resolve the stated Four-octet AS number requirement.

D:

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 Four-octet AS number requirement.

Question 258

A Junos network engineer takes this step: Configure and negotiate four-octet AS number support on the BGP peer. 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. Reflected paths that indicate looping are not accepted as fresh reachability.
  4. The session can represent modern 32-bit AS numbers instead of truncating them.

Explanation

Correct Answer

D:

This is the direct result of the Four-octet AS number decision: The session can represent modern 32-bit AS numbers instead of truncating them.

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.

B:

This outcome is associated with BGP additional paths (Enable supported BGP add-path advertisement for the chosen family and peers.), not the specified action.

C:

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 259

A transit provider operates with an autonomous system number beyond the traditional two-byte AS range. A colleague instead suggests: Enable supported BGP add-path advertisement for the chosen family and peers. Which corrective approach most directly addresses the original issue?

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

Explanation

Correct Answer

A:

This corrective choice addresses Four-octet AS number. The session can represent modern 32-bit AS numbers instead of truncating them.

Incorrect Answers

B:

That alternative applies to BGP additional paths instead. Additional eligible path identifiers can be communicated rather than only the active best path.

C:

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

D:

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

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.

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