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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 14

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.

Question 131

An Established BGP session repeatedly resets after hold time expires and peer keepalives are absent. A colleague instead suggests: Inspect BGP summary, neighbor details, and session error information. Which corrective approach most directly addresses the original issue?

  1. Enable a suitable EBGP multihop design and ensure route reachability to the remote peering address.
  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. Inspect BGP summary, neighbor details, and session error information.

Explanation

Correct Answer

C:

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

Incorrect Answers

A:

That alternative applies to EBGP multihop adjacency instead. An EBGP session is no longer limited to directly adjacent peer reachability.

B:

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

D:

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

Question 132

An enterprise network designer recommends: Investigate transport loss and negotiate compatible keepalive and hold timers on the BGP peers. 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. A BGP speaker expects its neighbor to be in AS 64502 but the remote peer is actually configured in AS 64512.
  4. An Established BGP session repeatedly resets after hold time expires and peer keepalives are absent.

Explanation

Correct Answer

D:

This case requires the BGP hold timer expiry action. Reliable keepalive exchange can prevent unintended hold-timer expiration.

Incorrect Answers

A:

This other case would be better matched to Enable a suitable EBGP multihop design and ensure route reachability to the remote peering address. An EBGP session is no longer limited to directly adjacent peer reachability.

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 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 133

Two established BGP routers need to advertise IPv6 unicast prefixes, but only IPv4 unicast family has been enabled. 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. Restore recursive reachability to the advertised next-hop before relying on the BGP route.
  4. Permit the required bidirectional TCP session to the BGP peer addresses through the approved filter.

Explanation

Correct Answer

A:

This action addresses BGP IPv6 family negotiation. Supported IPv6 unicast NLRI can be exchanged through the BGP session.

Incorrect Answers

B:

That action targets BGP source-address selection: The session's source address can match the remote router's configured neighbor. It does not directly resolve the stated BGP IPv6 family negotiation requirement.

C:

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 IPv6 family negotiation requirement.

D:

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 IPv6 family negotiation requirement.

Question 134

A Junos network engineer takes this step: Configure and negotiate the required BGP inet6 unicast family on both peers. Which outcome most directly follows?

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

Explanation

Correct Answer

B:

This is the direct result of the BGP IPv6 family negotiation decision: Supported IPv6 unicast NLRI can be exchanged through the BGP session.

Incorrect Answers

A:

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.

C:

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.

D:

This outcome is associated with BGP source-address selection (Configure the supported BGP local-address to use the intended loopback source.), not the specified action.

Question 135

Two established BGP routers need to advertise IPv6 unicast prefixes, but only IPv4 unicast family has been enabled. A colleague instead suggests: Restore recursive reachability to the advertised next-hop before relying on the BGP route. 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. Permit the required bidirectional TCP session to the BGP peer addresses through the approved filter.
  3. Configure and negotiate the required BGP inet6 unicast family on both peers.
  4. Configure the supported BGP local-address to use the intended loopback source.

Explanation

Correct Answer

C:

This corrective choice addresses BGP IPv6 family negotiation. Supported IPv6 unicast NLRI can be exchanged through the BGP session.

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

D:

That alternative applies to BGP source-address selection instead. The session's source address can match the remote router's configured neighbor.

Question 136

An enterprise network designer recommends: Configure and negotiate the required BGP inet6 unicast family on both peers. Which situation most clearly calls for this action?

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

Explanation

Correct Answer

D:

This case requires the BGP IPv6 family negotiation action. Supported IPv6 unicast NLRI can be exchanged through the BGP session.

Incorrect Answers

A:

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.

B:

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.

C:

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.

Question 137

A BGP peer remains Idle even though the routing interface is physically up, and operators need the protocol's own view. Which Junos networking action or protocol decision best addresses this requirement?

  1. Correct the external BGP peer AS configuration to match the real neighbor autonomous system.
  2. Investigate transport loss and negotiate compatible keepalive and hold timers on the BGP peers.
  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

C:

This action addresses BGP Idle state debugging. The engineer can identify a configuration or transport reason for the non-Established state.

Incorrect Answers

A:

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 Idle state debugging requirement.

B:

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

Question 138

A Junos network engineer takes this step: Inspect BGP summary, neighbor details, and session error information. Which outcome most directly follows?

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

Explanation

Correct Answer

D:

This is the direct result of the BGP Idle state debugging decision: The engineer can identify a configuration or transport reason for the non-Established state.

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

C:

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.

Question 139

A BGP peer remains Idle even though the routing interface is physically up, and operators need the protocol's own view. A colleague instead suggests: Correct the external BGP peer AS configuration to match the real neighbor autonomous system. 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. Enable a suitable EBGP multihop design and ensure route reachability to the remote peering address.
  4. Investigate transport loss and negotiate compatible keepalive and hold timers on the BGP peers.

Explanation

Correct Answer

A:

This corrective choice addresses BGP Idle state debugging. The engineer can identify a configuration or transport reason for the non-Established state.

Incorrect Answers

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 EBGP multihop adjacency instead. An EBGP session is no longer limited to directly adjacent peer reachability.

D:

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

Question 140

An enterprise network designer recommends: Inspect BGP summary, neighbor details, and session error information. Which situation most clearly calls for this action?

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

Explanation

Correct Answer

B:

This case requires the BGP Idle state debugging action. The engineer can identify a configuration or transport reason for the non-Established state.

Incorrect Answers

A:

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.

C:

This other case would be better matched to Enable a suitable EBGP multihop design and ensure route reachability to the remote peering address. An EBGP session is no longer limited to directly adjacent peer reachability.

D:

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.

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