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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 12

Question 110

A Junos network engineer takes this step: Inspect routing-table active-route preference and competing protocol entries. Which outcome most directly follows?

  1. The engineer can distinguish protocol topology learning from forwarding-route selection by preference.
  2. The rejected prefix can be stopped before policy evaluation reaches the general acceptance rule.
  3. Local external route installation can be suppressed while the link-state database remains unchanged.
  4. Advertising external reachability can be limited to the enumerated prefixes.

Explanation

Correct Answer

A:

This is the direct result of the OSPF route visibility troubleshooting decision: The engineer can distinguish protocol topology learning from forwarding-route selection by preference.

Incorrect Answers

B:

This outcome is associated with Policy term evaluation (Move the specific reject policy term before the broad accept term.), not the specified action.

C:

This outcome is associated with OSPF external import restriction (Apply an OSPF import policy that rejects the unwanted external route for local installation.), not the specified action.

D:

This outcome is associated with OSPF selective redistribution (Use precise route-filter terms with accept and an explicit default reject in the OSPF export policy.), not the specified action.

Question 111

An OSPF LSA for a destination is present, but the installed prefix uses a static route instead. A colleague instead suggests: Apply an OSPF import policy that rejects the unwanted external route for local installation. Which corrective approach most directly addresses the original issue?

  1. Use precise route-filter terms with accept and an explicit default reject in the OSPF export policy.
  2. Inspect routing-table active-route preference and competing protocol entries.
  3. Move the specific reject policy term before the broad accept term.
  4. Apply an OSPF import policy that rejects the unwanted external route for local installation.

Explanation

Correct Answer

B:

This corrective choice addresses OSPF route visibility troubleshooting. The engineer can distinguish protocol topology learning from forwarding-route selection by preference.

Incorrect Answers

A:

That alternative applies to OSPF selective redistribution instead. Advertising external reachability can be limited to the enumerated prefixes.

C:

That alternative applies to Policy term evaluation instead. The rejected prefix can be stopped before policy evaluation reaches the general acceptance rule.

D:

That alternative applies to OSPF external import restriction instead. Local external route installation can be suppressed while the link-state database remains unchanged.

Question 112

An enterprise network designer recommends: Inspect routing-table active-route preference and competing protocol entries. Which situation most clearly calls for this action?

  1. Only two approved static application networks, not every static network, may be redistributed into enterprise OSPF.
  2. A network must prevent an unwanted OSPF external prefix from entering one Junos routing table without altering its originating LSA flood.
  3. An OSPF LSA for a destination is present, but the installed prefix uses a static route instead.
  4. A Junos routing policy has a broad accept term before a more specific deny term, so an unwanted route matches the first term.

Explanation

Correct Answer

C:

This case requires the OSPF route visibility troubleshooting action. The engineer can distinguish protocol topology learning from forwarding-route selection by preference.

Incorrect Answers

A:

This other case would be better matched to Use precise route-filter terms with accept and an explicit default reject in the OSPF export policy. Advertising external reachability can be limited to the enumerated prefixes.

B:

This other case would be better matched to Apply an OSPF import policy that rejects the unwanted external route for local installation. Local external route installation can be suppressed while the link-state database remains unchanged.

D:

This other case would be better matched to Move the specific reject policy term before the broad accept term. The rejected prefix can be stopped before policy evaluation reaches the general acceptance rule.

Question 113

A BGP speaker expects its neighbor to be in AS 64502 but the remote peer is actually configured in AS 64512. 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. Enable a suitable EBGP multihop design and ensure route reachability to the remote peering address.
  4. Inspect BGP summary, neighbor details, and session error information.

Explanation

Correct Answer

A:

This action addresses EBGP remote AS mismatch. The AS identity check need not prevent a BGP session from becoming Established.

Incorrect Answers

B:

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

C:

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 EBGP remote AS mismatch requirement.

D:

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 remote AS mismatch requirement.

Question 114

A Junos network engineer takes this step: Correct the external BGP peer AS configuration to match the real neighbor autonomous system. Which outcome most directly follows?

  1. An EBGP session is no longer limited to directly adjacent peer reachability.
  2. The AS identity check need not prevent a BGP session from becoming Established.
  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

B:

This is the direct result of the EBGP remote AS mismatch decision: The AS identity check need not prevent a BGP session from becoming Established.

Incorrect Answers

A:

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.

D:

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

Question 115

A BGP speaker expects its neighbor to be in AS 64502 but the remote peer is actually configured in AS 64512. A colleague instead suggests: Enable a suitable EBGP multihop design and ensure route reachability to the remote peering address. Which corrective approach most directly addresses the original issue?

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

Explanation

Correct Answer

C:

This corrective choice addresses EBGP remote AS mismatch. The AS identity check need not prevent a BGP session from becoming Established.

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 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 116

An enterprise network designer recommends: Correct the external BGP peer AS configuration to match the real neighbor autonomous system. Which situation most clearly calls for this action?

  1. A BGP peer remains Idle even though the routing interface is physically up, and operators need the protocol's own view.
  2. An Established BGP session repeatedly resets after hold time expires and peer keepalives are absent.
  3. Two EBGP speakers use loopback addresses and are separated by more than one routed hop.
  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

D:

This case requires the EBGP remote AS mismatch action. The AS identity check need not prevent a BGP session from becoming Established.

Incorrect Answers

A:

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.

B:

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.

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.

Question 117

BGP neighbors have matching AS numbers yet TCP port 179 cannot be reached through the intervening security filter. 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

C:

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

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 TCP reachability requirement.

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 TCP reachability 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 TCP reachability requirement.

Question 118

A Junos network engineer takes this step: Permit the required bidirectional TCP session to the BGP peer addresses through the approved filter. Which outcome most directly follows?

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

Explanation

Correct Answer

D:

This is the direct result of the BGP TCP reachability decision: The BGP transport connection can establish when other session parameters are correct.

Incorrect Answers

A:

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.

B:

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

Question 119

BGP neighbors have matching AS numbers yet TCP port 179 cannot be reached through the intervening security filter. A colleague instead suggests: Configure the supported BGP local-address to use the intended loopback source. Which corrective approach most directly addresses the original issue?

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

Explanation

Correct Answer

A:

This corrective choice addresses BGP TCP reachability. The BGP transport connection can establish when other session parameters are correct.

Incorrect Answers

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 source-address selection instead. The session's source address can match the remote router's configured neighbor.

D:

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

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.

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