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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 25

Question 240

An enterprise network designer recommends: Apply the correct policy to the intended BGP group or neighbor export statement. Which situation most clearly calls for this action?

  1. Only a specified enterprise public aggregate should be advertised to the ISP, not internal interface or lab prefixes.
  2. A border router has private lab routes that must never be propagated to an external BGP neighbor.
  3. An export policy is defined under policy-options but no BGP group or neighbor references it.
  4. Two BGP export policies are chained, but an early accept stops evaluation before the intended security reject.

Explanation

Correct Answer

C:

This case requires the BGP policy placement action. The BGP advertisement decision begins using the configured routing policy.

Incorrect Answers

A:

This other case would be better matched to Configure an export policy that explicitly accepts the approved aggregate and rejects all other routes. BGP advertisements to the ISP are constrained to the permitted external prefix.

B:

This other case would be better matched to Add an explicit export reject for the prohibited internal prefix range before a broad allow rule. The external peer does not receive the prohibited internal networks from that policy.

D:

This other case would be better matched to Place the critical reject policy before the permissive acceptance rule or refactor matching. Evaluation reaches the security restriction before a terminating accept action.

Question 241

A Junos speaker learns IPv4 BGP routes but an IPv6 peer must exchange inet6 unicast network prefixes. Which Junos networking action or protocol decision best addresses this requirement?

  1. Configure and negotiate four-octet AS number support on the BGP peer.
  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. Enable the appropriate inet6 BGP NLRI family on the configured session.

Explanation

Correct Answer

D:

This action addresses IPv6 BGP NLRI family. The peers can advertise and receive IPv6 unicast routing information.

Incorrect Answers

A:

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 IPv6 BGP NLRI family requirement.

B:

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 IPv6 BGP NLRI family requirement.

C:

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 IPv6 BGP NLRI family requirement.

Question 242

A Junos network engineer takes this step: Enable the appropriate inet6 BGP NLRI family on the configured session. 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

A:

This is the direct result of the IPv6 BGP NLRI family decision: The peers can advertise and receive IPv6 unicast routing information.

Incorrect Answers

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.

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 243

A Junos speaker learns IPv4 BGP routes but an IPv6 peer must exchange inet6 unicast network prefixes. A colleague instead suggests: Use BGP route-reflection originator-ID and cluster-list loop prevention behavior. 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. Use BGP route-reflection originator-ID and cluster-list loop prevention behavior.
  4. Configure and negotiate four-octet AS number support on the BGP peer.

Explanation

Correct Answer

B:

This corrective choice addresses IPv6 BGP NLRI family. The peers can advertise and receive IPv6 unicast routing information.

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.

C:

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 244

An enterprise network designer recommends: Enable the appropriate inet6 BGP NLRI family on the configured session. 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 transit provider operates with an autonomous system number beyond the traditional two-byte AS range.
  3. A Junos speaker learns IPv4 BGP routes but an IPv6 peer must exchange inet6 unicast network prefixes.
  4. A route reflector must propagate more than its single selected best path to support diverse client path choices.

Explanation

Correct Answer

C:

This case requires the IPv6 BGP NLRI family action. The peers can advertise and receive IPv6 unicast routing information.

Incorrect Answers

A:

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.

B:

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.

D:

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.

Question 245

A router receives two eligible equal-cost BGP paths and should forward traffic across both supported next hops. Which Junos networking action or protocol decision best addresses this requirement?

  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. Compare advertised and received BGP capability and family configuration on both routers.
  4. Use the inet unicast family for IPv4 unicast BGP exchange.

Explanation

Correct Answer

B:

This action addresses BGP ECMP multipath. Eligible BGP paths can participate in multipath forwarding instead of one chosen exit.

Incorrect Answers

A:

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 ECMP multipath requirement.

C:

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

D:

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 ECMP multipath requirement.

Question 246

A Junos network engineer takes this step: Configure supported BGP multipath and verify forwarding-table next-hop installation. Which outcome most directly follows?

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

Explanation

Correct Answer

C:

This is the direct result of the BGP ECMP multipath decision: Eligible BGP paths can participate in multipath forwarding instead of one chosen exit.

Incorrect Answers

A:

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.

B:

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

Question 247

A router receives two eligible equal-cost BGP paths and should forward traffic across both supported next hops. A colleague instead suggests: Use the inet unicast family for IPv4 unicast BGP exchange. Which corrective approach most directly addresses the original issue?

  1. Evaluate and implement supported BGP route dampening policy with carefully chosen suppression thresholds.
  2. Compare advertised and received BGP capability and family configuration on both routers.
  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

D:

This corrective choice addresses BGP ECMP multipath. Eligible BGP paths can participate in multipath forwarding instead of one chosen exit.

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 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.

Question 248

An enterprise network designer recommends: Configure supported BGP multipath and verify forwarding-table next-hop installation. 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

A:

This case requires the BGP ECMP multipath action. Eligible BGP paths can participate in multipath forwarding instead of one chosen exit.

Incorrect Answers

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.

C:

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.

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 249

A route-reflector client receives a reflected BGP route that risks looping back through its own originator ID. Which Junos networking action or protocol decision best addresses this requirement?

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

Explanation

Correct Answer

B:

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

Incorrect Answers

A:

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 Route-reflector loop control requirement.

C:

That action targets IPv6 BGP NLRI family: The peers can advertise and receive IPv6 unicast routing information. It does not directly resolve the stated Route-reflector loop control requirement.

D:

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 Route-reflector loop control requirement.

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.

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