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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 13

Question 120

An enterprise network designer recommends: Permit the required bidirectional TCP session to the BGP peer addresses through the approved filter. Which situation most clearly calls for this action?

  1. Two established BGP routers need to advertise IPv6 unicast prefixes, but only IPv4 unicast family has been enabled.
  2. BGP neighbors have matching AS numbers yet TCP port 179 cannot be reached through the intervening security filter.
  3. A BGP peer advertises an IPv4 prefix with a next-hop address absent from the local routing table.
  4. An iBGP session is meant to use stable loopbacks but packets originate from a transit interface address the remote peer does not expect.

Explanation

Correct Answer

B:

This case requires the BGP TCP reachability action. The BGP transport connection can establish when other session parameters are correct.

Incorrect Answers

A:

This other case would be better matched to Configure and negotiate the required BGP inet6 unicast family on both peers. Supported IPv6 unicast NLRI can be exchanged through the BGP session.

C:

This other case would be better matched to Restore recursive reachability to the advertised next-hop before relying on the BGP route. The received BGP path can become eligible for installation when its next hop resolves.

D:

This other case would be better matched to Configure the supported BGP local-address to use the intended loopback source. The session's source address can match the remote router's configured neighbor.

Question 121

Two EBGP speakers use loopback addresses and are separated by more than one routed hop. Which Junos networking action or protocol decision best addresses this requirement?

  1. Inspect BGP summary, neighbor details, and session error information.
  2. Enable a suitable EBGP multihop design and ensure route reachability to the remote peering address.
  3. Investigate transport loss and negotiate compatible keepalive and hold timers on the BGP peers.
  4. Correct the external BGP peer AS configuration to match the real neighbor autonomous system.

Explanation

Correct Answer

B:

This action addresses EBGP multihop adjacency. An EBGP session is no longer limited to directly adjacent peer reachability.

Incorrect Answers

A:

That action targets BGP Idle state debugging: The engineer can identify a configuration or transport reason for the non-Established state. It does not directly resolve the stated EBGP multihop adjacency requirement.

C:

That action targets BGP hold timer expiry: Reliable keepalive exchange can prevent unintended hold-timer expiration. It does not directly resolve the stated EBGP multihop adjacency requirement.

D:

That action targets EBGP remote AS mismatch: The AS identity check need not prevent a BGP session from becoming Established. It does not directly resolve the stated EBGP multihop adjacency requirement.

Question 122

A Junos network engineer takes this step: Enable a suitable EBGP multihop design and ensure route reachability to the remote peering address. Which outcome most directly follows?

  1. The AS identity check need not prevent a BGP session from becoming Established.
  2. Reliable keepalive exchange can prevent unintended hold-timer expiration.
  3. An EBGP session is no longer limited to directly adjacent peer reachability.
  4. The engineer can identify a configuration or transport reason for the non-Established state.

Explanation

Correct Answer

C:

This is the direct result of the EBGP multihop adjacency decision: An EBGP session is no longer limited to directly adjacent peer reachability.

Incorrect Answers

A:

This outcome is associated with EBGP remote AS mismatch (Correct the external BGP peer AS configuration to match the real neighbor autonomous system.), not the specified action.

B:

This outcome is associated with BGP hold timer expiry (Investigate transport loss and negotiate compatible keepalive and hold timers on the BGP peers.), not the specified action.

D:

This outcome is associated with BGP Idle state debugging (Inspect BGP summary, neighbor details, and session error information.), not the specified action.

Question 123

Two EBGP speakers use loopback addresses and are separated by more than one routed hop. A colleague instead suggests: Investigate transport loss and negotiate compatible keepalive and hold timers on the BGP peers. Which corrective approach most directly addresses the original issue?

  1. Inspect BGP summary, neighbor details, and session error information.
  2. Correct the external BGP peer AS configuration to match the real neighbor autonomous system.
  3. Investigate transport loss and negotiate compatible keepalive and hold timers on the BGP peers.
  4. Enable a suitable EBGP multihop design and ensure route reachability to the remote peering address.

Explanation

Correct Answer

D:

This corrective choice addresses EBGP multihop adjacency. An EBGP session is no longer limited to directly adjacent peer reachability.

Incorrect Answers

A:

That alternative applies to BGP Idle state debugging instead. The engineer can identify a configuration or transport reason for the non-Established state.

B:

That alternative applies to EBGP remote AS mismatch instead. The AS identity check need not prevent a BGP session from becoming Established.

C:

That alternative applies to BGP hold timer expiry instead. Reliable keepalive exchange can prevent unintended hold-timer expiration.

Question 124

An enterprise network designer recommends: Enable a suitable EBGP multihop design and ensure route reachability to the remote peering address. Which situation most clearly calls for this action?

  1. Two EBGP speakers use loopback addresses and are separated by more than one routed hop.
  2. A BGP peer remains Idle even though the routing interface is physically up, and operators need the protocol's own view.
  3. An Established BGP session repeatedly resets after hold time expires and peer keepalives are absent.
  4. A BGP speaker expects its neighbor to be in AS 64502 but the remote peer is actually configured in AS 64512.

Explanation

Correct Answer

A:

This case requires the EBGP multihop adjacency action. An EBGP session is no longer limited to directly adjacent peer reachability.

Incorrect Answers

B:

This other case would be better matched to Inspect BGP summary, neighbor details, and session error information. The engineer can identify a configuration or transport reason for the non-Established state.

C:

This other case would be better matched to Investigate transport loss and negotiate compatible keepalive and hold timers on the BGP peers. Reliable keepalive exchange can prevent unintended hold-timer expiration.

D:

This other case would be better matched to Correct the external BGP peer AS configuration to match the real neighbor autonomous system. The AS identity check need not prevent a BGP session from becoming Established.

Question 125

An iBGP session is meant to use stable loopbacks but packets originate from a transit interface address the remote peer does not expect. Which Junos networking action or protocol decision best addresses this requirement?

  1. Configure and negotiate the required BGP inet6 unicast family on both peers.
  2. Configure the supported BGP local-address to use the intended loopback source.
  3. Permit the required bidirectional TCP session to the BGP peer addresses through the approved filter.
  4. Restore recursive reachability to the advertised next-hop before relying on the BGP route.

Explanation

Correct Answer

B:

This action addresses BGP source-address selection. The session's source address can match the remote router's configured neighbor.

Incorrect Answers

A:

That action targets BGP IPv6 family negotiation: Supported IPv6 unicast NLRI can be exchanged through the BGP session. It does not directly resolve the stated BGP source-address selection requirement.

C:

That action targets BGP TCP reachability: The BGP transport connection can establish when other session parameters are correct. It does not directly resolve the stated BGP source-address selection requirement.

D:

That action targets BGP source next-hop reachability: The received BGP path can become eligible for installation when its next hop resolves. It does not directly resolve the stated BGP source-address selection requirement.

Question 126

A Junos network engineer takes this step: Configure the supported BGP local-address to use the intended loopback source. Which outcome most directly follows?

  1. The BGP transport connection can establish when other session parameters are correct.
  2. Supported IPv6 unicast NLRI can be exchanged through the BGP session.
  3. The session's source address can match the remote router's configured neighbor.
  4. The received BGP path can become eligible for installation when its next hop resolves.

Explanation

Correct Answer

C:

This is the direct result of the BGP source-address selection decision: The session's source address can match the remote router's configured neighbor.

Incorrect Answers

A:

This outcome is associated with BGP TCP reachability (Permit the required bidirectional TCP session to the BGP peer addresses through the approved filter.), not the specified action.

B:

This outcome is associated with BGP IPv6 family negotiation (Configure and negotiate the required BGP inet6 unicast family on both peers.), not the specified action.

D:

This outcome is associated with BGP source next-hop reachability (Restore recursive reachability to the advertised next-hop before relying on the BGP route.), not the specified action.

Question 127

An iBGP session is meant to use stable loopbacks but packets originate from a transit interface address the remote peer does not expect. A colleague instead suggests: Configure and negotiate the required BGP inet6 unicast family on both peers. Which corrective approach most directly addresses the original issue?

  1. Restore recursive reachability to the advertised next-hop before relying on the BGP route.
  2. Configure and negotiate the required BGP inet6 unicast family on both peers.
  3. Permit the required bidirectional TCP session to the BGP peer addresses through the approved filter.
  4. Configure the supported BGP local-address to use the intended loopback source.

Explanation

Correct Answer

D:

This corrective choice addresses BGP source-address selection. The session's source address can match the remote router's configured neighbor.

Incorrect Answers

A:

That alternative applies to BGP source next-hop reachability instead. The received BGP path can become eligible for installation when its next hop resolves.

B:

That alternative applies to BGP IPv6 family negotiation instead. Supported IPv6 unicast NLRI can be exchanged through the BGP session.

C:

That alternative applies to BGP TCP reachability instead. The BGP transport connection can establish when other session parameters are correct.

Question 128

An enterprise network designer recommends: Configure the supported BGP local-address to use the intended loopback source. Which situation most clearly calls for this action?

  1. An iBGP session is meant to use stable loopbacks but packets originate from a transit interface address the remote peer does not expect.
  2. BGP neighbors have matching AS numbers yet TCP port 179 cannot be reached through the intervening security filter.
  3. A BGP peer advertises an IPv4 prefix with a next-hop address absent from the local routing table.
  4. Two established BGP routers need to advertise IPv6 unicast prefixes, but only IPv4 unicast family has been enabled.

Explanation

Correct Answer

A:

This case requires the BGP source-address selection action. The session's source address can match the remote router's configured neighbor.

Incorrect Answers

B:

This other case would be better matched to Permit the required bidirectional TCP session to the BGP peer addresses through the approved filter. The BGP transport connection can establish when other session parameters are correct.

C:

This other case would be better matched to Restore recursive reachability to the advertised next-hop before relying on the BGP route. The received BGP path can become eligible for installation when its next hop resolves.

D:

This other case would be better matched to Configure and negotiate the required BGP inet6 unicast family on both peers. Supported IPv6 unicast NLRI can be exchanged through the BGP session.

Question 129

An Established BGP session repeatedly resets after hold time expires and peer keepalives are absent. Which Junos networking action or protocol decision best addresses this requirement?

  1. Investigate transport loss and negotiate compatible keepalive and hold timers on the BGP peers.
  2. Correct the external BGP peer AS configuration to match the real neighbor autonomous system.
  3. Inspect BGP summary, neighbor details, and session error information.
  4. Enable a suitable EBGP multihop design and ensure route reachability to the remote peering address.

Explanation

Correct Answer

A:

This action addresses BGP hold timer expiry. Reliable keepalive exchange can prevent unintended hold-timer expiration.

Incorrect Answers

B:

That action targets EBGP remote AS mismatch: The AS identity check need not prevent a BGP session from becoming Established. It does not directly resolve the stated BGP hold timer expiry requirement.

C:

That action targets BGP Idle state debugging: The engineer can identify a configuration or transport reason for the non-Established state. It does not directly resolve the stated BGP hold timer expiry requirement.

D:

That action targets EBGP multihop adjacency: An EBGP session is no longer limited to directly adjacent peer reachability. It does not directly resolve the stated BGP hold timer expiry requirement.

Question 130

A Junos network engineer takes this step: Investigate transport loss and negotiate compatible keepalive and hold timers on the BGP peers. Which outcome most directly follows?

  1. The engineer can identify a configuration or transport reason for the non-Established state.
  2. Reliable keepalive exchange can prevent unintended hold-timer expiration.
  3. The AS identity check need not prevent a BGP session from becoming Established.
  4. An EBGP session is no longer limited to directly adjacent peer reachability.

Explanation

Correct Answer

B:

This is the direct result of the BGP hold timer expiry decision: Reliable keepalive exchange can prevent unintended hold-timer expiration.

Incorrect Answers

A:

This outcome is associated with BGP Idle state debugging (Inspect BGP summary, neighbor details, and session error information.), not the specified action.

C:

This outcome is associated with EBGP remote AS mismatch (Correct the external BGP peer AS configuration to match the real neighbor autonomous system.), not the specified action.

D:

This outcome is associated with EBGP multihop adjacency (Enable a suitable EBGP multihop design and ensure route reachability to the remote peering address.), not the specified action.

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