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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 6

Question 50

A Junos network engineer takes this step: Design the branch as a suitable OSPF NSSA and use its type 7 external origination behavior. Which outcome most directly follows?

  1. External routes can be introduced inside the NSSA without normal type 5 flooding within that area.
  2. Interarea announcements can be condensed to an aggregate representing covered prefixes.
  3. Flooding on the broadcast segment is coordinated through elected DR and BDR roles.
  4. Interarea exchange can traverse a continuous logical backbone as OSPF requires.

Explanation

Correct Answer

A:

This is the direct result of the NSSA external route decision: External routes can be introduced inside the NSSA without normal type 5 flooding within that area.

Incorrect Answers

B:

This outcome is associated with OSPF interarea summary (Configure a valid OSPF area range summary at the appropriate area border router.), not the specified action.

C:

This outcome is associated with OSPF designated router election (Use the OSPF designated router and backup designated router election mechanism.), not the specified action.

D:

This outcome is associated with Backbone area connectivity (Restore a valid OSPF backbone connection or properly supported virtual-link design where justified.), not the specified action.

Question 51

A branch OSPF area must avoid ordinary external type 5 LSAs but allow limited local external injection. A colleague instead suggests: Restore a valid OSPF backbone connection or properly supported virtual-link design where justified. Which corrective approach most directly addresses the original issue?

  1. Restore a valid OSPF backbone connection or properly supported virtual-link design where justified.
  2. Design the branch as a suitable OSPF NSSA and use its type 7 external origination behavior.
  3. Configure a valid OSPF area range summary at the appropriate area border router.
  4. Use the OSPF designated router and backup designated router election mechanism.

Explanation

Correct Answer

B:

This corrective choice addresses NSSA external route. External routes can be introduced inside the NSSA without normal type 5 flooding within that area.

Incorrect Answers

A:

That alternative applies to Backbone area connectivity instead. Interarea exchange can traverse a continuous logical backbone as OSPF requires.

C:

That alternative applies to OSPF interarea summary instead. Interarea announcements can be condensed to an aggregate representing covered prefixes.

D:

That alternative applies to OSPF designated router election instead. Flooding on the broadcast segment is coordinated through elected DR and BDR roles.

Question 52

An enterprise network designer recommends: Design the branch as a suitable OSPF NSSA and use its type 7 external origination behavior. Which situation most clearly calls for this action?

  1. A multiple-area OSPF topology lacks a valid area zero transit path between area border routers.
  2. A growing enterprise advertises many contiguous internal prefixes from one OSPF area to other areas through its border router.
  3. A branch OSPF area must avoid ordinary external type 5 LSAs but allow limited local external injection.
  4. Several OSPF routers share a broadcast Ethernet VLAN and require an efficient way to exchange link-state information.

Explanation

Correct Answer

C:

This case requires the NSSA external route action. External routes can be introduced inside the NSSA without normal type 5 flooding within that area.

Incorrect Answers

A:

This other case would be better matched to Restore a valid OSPF backbone connection or properly supported virtual-link design where justified. Interarea exchange can traverse a continuous logical backbone as OSPF requires.

B:

This other case would be better matched to Configure a valid OSPF area range summary at the appropriate area border router. Interarea announcements can be condensed to an aggregate representing covered prefixes.

D:

This other case would be better matched to Use the OSPF designated router and backup designated router election mechanism. Flooding on the broadcast segment is coordinated through elected DR and BDR roles.

Question 53

A route is missing from the OSPF routing table and the engineer must determine whether its LSA is present at all. Which Junos networking action or protocol decision best addresses this requirement?

  1. Allow updated link-state advertisements to flood and each router to recompute SPF.
  2. Compare the OSPF link-state database with the installed routing table.
  3. Redistribute the selected external route using a controlled OSPF export policy on an ASBR.
  4. Adjust the relevant OSPF interface cost to express the desired preferred path.

Explanation

Correct Answer

B:

This action addresses Link-state database inspection. The operator can distinguish missing topology advertisements from a later route selection issue.

Incorrect Answers

A:

That action targets OSPF topology change propagation: The routers can recalculate shortest paths from a consistent view of the changed topology. It does not directly resolve the stated Link-state database inspection requirement.

C:

That action targets ASBR external injection: Eligible external prefixes can be originated as OSPF external routing information. It does not directly resolve the stated Link-state database inspection requirement.

D:

That action targets OSPF cost tuning: Shortest-path computation can select the path with the lower cumulative OSPF cost. It does not directly resolve the stated Link-state database inspection requirement.

Question 54

A Junos network engineer takes this step: Compare the OSPF link-state database with the installed routing table. Which outcome most directly follows?

  1. Shortest-path computation can select the path with the lower cumulative OSPF cost.
  2. The routers can recalculate shortest paths from a consistent view of the changed topology.
  3. The operator can distinguish missing topology advertisements from a later route selection issue.
  4. Eligible external prefixes can be originated as OSPF external routing information.

Explanation

Correct Answer

C:

This is the direct result of the Link-state database inspection decision: The operator can distinguish missing topology advertisements from a later route selection issue.

Incorrect Answers

A:

This outcome is associated with OSPF cost tuning (Adjust the relevant OSPF interface cost to express the desired preferred path.), not the specified action.

B:

This outcome is associated with OSPF topology change propagation (Allow updated link-state advertisements to flood and each router to recompute SPF.), not the specified action.

D:

This outcome is associated with ASBR external injection (Redistribute the selected external route using a controlled OSPF export policy on an ASBR.), not the specified action.

Question 55

A route is missing from the OSPF routing table and the engineer must determine whether its LSA is present at all. A colleague instead suggests: Allow updated link-state advertisements to flood and each router to recompute SPF. Which corrective approach most directly addresses the original issue?

  1. Redistribute the selected external route using a controlled OSPF export policy on an ASBR.
  2. Adjust the relevant OSPF interface cost to express the desired preferred path.
  3. Allow updated link-state advertisements to flood and each router to recompute SPF.
  4. Compare the OSPF link-state database with the installed routing table.

Explanation

Correct Answer

D:

This corrective choice addresses Link-state database inspection. The operator can distinguish missing topology advertisements from a later route selection issue.

Incorrect Answers

A:

That alternative applies to ASBR external injection instead. Eligible external prefixes can be originated as OSPF external routing information.

B:

That alternative applies to OSPF cost tuning instead. Shortest-path computation can select the path with the lower cumulative OSPF cost.

C:

That alternative applies to OSPF topology change propagation instead. The routers can recalculate shortest paths from a consistent view of the changed topology.

Question 56

An enterprise network designer recommends: Compare the OSPF link-state database with the installed routing table. Which situation most clearly calls for this action?

  1. A route is missing from the OSPF routing table and the engineer must determine whether its LSA is present at all.
  2. Two OSPF paths reach the same prefix, but the low-bandwidth path is preferred because its accumulated metric is currently lower.
  3. An OSPF domain must carry a route learned from an external protocol and identify the source as external to the OSPF area topology.
  4. A router loses a directly connected OSPF link and other area members continue forwarding on obsolete topology until they receive an update.

Explanation

Correct Answer

A:

This case requires the Link-state database inspection action. The operator can distinguish missing topology advertisements from a later route selection issue.

Incorrect Answers

B:

This other case would be better matched to Adjust the relevant OSPF interface cost to express the desired preferred path. Shortest-path computation can select the path with the lower cumulative OSPF cost.

C:

This other case would be better matched to Redistribute the selected external route using a controlled OSPF export policy on an ASBR. Eligible external prefixes can be originated as OSPF external routing information.

D:

This other case would be better matched to Allow updated link-state advertisements to flood and each router to recompute SPF. The routers can recalculate shortest paths from a consistent view of the changed topology.

Question 57

A multiple-area OSPF topology lacks a valid area zero transit path between area border routers. Which Junos networking action or protocol decision best addresses this requirement?

  1. Use the OSPF designated router and backup designated router election mechanism.
  2. Design the branch as a suitable OSPF NSSA and use its type 7 external origination behavior.
  3. Restore a valid OSPF backbone connection or properly supported virtual-link design where justified.
  4. Configure a valid OSPF area range summary at the appropriate area border router.

Explanation

Correct Answer

C:

This action addresses Backbone area connectivity. Interarea exchange can traverse a continuous logical backbone as OSPF requires.

Incorrect Answers

A:

That action targets OSPF designated router election: Flooding on the broadcast segment is coordinated through elected DR and BDR roles. It does not directly resolve the stated Backbone area connectivity requirement.

B:

That action targets NSSA external route: External routes can be introduced inside the NSSA without normal type 5 flooding within that area. It does not directly resolve the stated Backbone area connectivity requirement.

D:

That action targets OSPF interarea summary: Interarea announcements can be condensed to an aggregate representing covered prefixes. It does not directly resolve the stated Backbone area connectivity requirement.

Question 58

A Junos network engineer takes this step: Restore a valid OSPF backbone connection or properly supported virtual-link design where justified. Which outcome most directly follows?

  1. External routes can be introduced inside the NSSA without normal type 5 flooding within that area.
  2. Flooding on the broadcast segment is coordinated through elected DR and BDR roles.
  3. Interarea announcements can be condensed to an aggregate representing covered prefixes.
  4. Interarea exchange can traverse a continuous logical backbone as OSPF requires.

Explanation

Correct Answer

D:

This is the direct result of the Backbone area connectivity decision: Interarea exchange can traverse a continuous logical backbone as OSPF requires.

Incorrect Answers

A:

This outcome is associated with NSSA external route (Design the branch as a suitable OSPF NSSA and use its type 7 external origination behavior.), not the specified action.

B:

This outcome is associated with OSPF designated router election (Use the OSPF designated router and backup designated router election mechanism.), not the specified action.

C:

This outcome is associated with OSPF interarea summary (Configure a valid OSPF area range summary at the appropriate area border router.), not the specified action.

Question 59

A multiple-area OSPF topology lacks a valid area zero transit path between area border routers. A colleague instead suggests: Use the OSPF designated router and backup designated router election mechanism. Which corrective approach most directly addresses the original issue?

  1. Restore a valid OSPF backbone connection or properly supported virtual-link design where justified.
  2. Design the branch as a suitable OSPF NSSA and use its type 7 external origination behavior.
  3. Configure a valid OSPF area range summary at the appropriate area border router.
  4. Use the OSPF designated router and backup designated router election mechanism.

Explanation

Correct Answer

A:

This corrective choice addresses Backbone area connectivity. Interarea exchange can traverse a continuous logical backbone as OSPF requires.

Incorrect Answers

B:

That alternative applies to NSSA external route instead. External routes can be introduced inside the NSSA without normal type 5 flooding within that area.

C:

That alternative applies to OSPF interarea summary instead. Interarea announcements can be condensed to an aggregate representing covered prefixes.

D:

That alternative applies to OSPF designated router election instead. Flooding on the broadcast segment is coordinated through elected DR and BDR roles.

Question 60

An enterprise network designer recommends: Restore a valid OSPF backbone connection or properly supported virtual-link design where justified. Which situation most clearly calls for this action?

  1. A branch OSPF area must avoid ordinary external type 5 LSAs but allow limited local external injection.
  2. A multiple-area OSPF topology lacks a valid area zero transit path between area border routers.
  3. A growing enterprise advertises many contiguous internal prefixes from one OSPF area to other areas through its border router.
  4. Several OSPF routers share a broadcast Ethernet VLAN and require an efficient way to exchange link-state information.

Explanation

Correct Answer

B:

This case requires the Backbone area connectivity action. Interarea exchange can traverse a continuous logical backbone as OSPF requires.

Incorrect Answers

A:

This other case would be better matched to Design the branch as a suitable OSPF NSSA and use its type 7 external origination behavior. External routes can be introduced inside the NSSA without normal type 5 flooding within that area.

C:

This other case would be better matched to Configure a valid OSPF area range summary at the appropriate area border router. Interarea announcements can be condensed to an aggregate representing covered prefixes.

D:

This other case would be better matched to Use the OSPF designated router and backup designated router election mechanism. Flooding on the broadcast segment is coordinated through elected DR and BDR roles.

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