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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 5

Question 40

An enterprise network designer recommends: Adjust the relevant OSPF interface cost to express the desired preferred path. Which situation most clearly calls for this action?

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

Explanation

Correct Answer

A:

This case requires the OSPF cost tuning action. Shortest-path computation can select the path with the lower cumulative OSPF cost.

Incorrect Answers

B:

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.

C:

This other case would be better matched to Compare the OSPF link-state database with the installed routing table. The operator can distinguish missing topology advertisements from a later route selection issue.

D:

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.

Question 41

A growing enterprise advertises many contiguous internal prefixes from one OSPF area to other areas through its border router. Which Junos networking action or protocol decision best addresses this requirement?

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

Explanation

Correct Answer

A:

This action addresses OSPF interarea summary. Interarea announcements can be condensed to an aggregate representing covered prefixes.

Incorrect Answers

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 OSPF interarea summary requirement.

C:

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 OSPF interarea summary requirement.

D:

That action targets Backbone area connectivity: Interarea exchange can traverse a continuous logical backbone as OSPF requires. It does not directly resolve the stated OSPF interarea summary requirement.

Question 42

A Junos network engineer takes this step: Configure a valid OSPF area range summary at the appropriate area border router. 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. Interarea exchange can traverse a continuous logical backbone as OSPF requires.
  4. Flooding on the broadcast segment is coordinated through elected DR and BDR roles.

Explanation

Correct Answer

B:

This is the direct result of the OSPF interarea summary decision: Interarea announcements can be condensed to an aggregate representing covered prefixes.

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.

C:

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.

D:

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

Question 43

A growing enterprise advertises many contiguous internal prefixes from one OSPF area to other areas through its border router. A colleague instead suggests: Design the branch as a suitable OSPF NSSA and use its type 7 external origination behavior. 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. Use the OSPF designated router and backup designated router election mechanism.
  3. Configure a valid OSPF area range summary at the appropriate area border router.
  4. Design the branch as a suitable OSPF NSSA and use its type 7 external origination behavior.

Explanation

Correct Answer

C:

This corrective choice addresses OSPF interarea summary. Interarea announcements can be condensed to an aggregate representing covered prefixes.

Incorrect Answers

A:

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

B:

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

D:

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

Question 44

An enterprise network designer recommends: Configure a valid OSPF area range summary at the appropriate area border router. Which situation most clearly calls for this action?

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

Explanation

Correct Answer

D:

This case requires the OSPF interarea summary action. Interarea announcements can be condensed to an aggregate representing covered prefixes.

Incorrect Answers

A:

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.

B:

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 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.

Question 45

An OSPF domain must carry a route learned from an external protocol and identify the source as external to the OSPF area topology. 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. Adjust the relevant OSPF interface cost to express the desired preferred path.
  4. Redistribute the selected external route using a controlled OSPF export policy on an ASBR.

Explanation

Correct Answer

D:

This action addresses ASBR external injection. Eligible external prefixes can be originated as OSPF external routing information.

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 ASBR external injection requirement.

B:

That action targets Link-state database inspection: The operator can distinguish missing topology advertisements from a later route selection issue. It does not directly resolve the stated ASBR external injection requirement.

C:

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 ASBR external injection requirement.

Question 46

A Junos network engineer takes this step: Redistribute the selected external route using a controlled OSPF export policy on an ASBR. Which outcome most directly follows?

  1. Eligible external prefixes can be originated as OSPF external routing information.
  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. Shortest-path computation can select the path with the lower cumulative OSPF cost.

Explanation

Correct Answer

A:

This is the direct result of the ASBR external injection decision: Eligible external prefixes can be originated as OSPF external routing information.

Incorrect Answers

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.

C:

This outcome is associated with Link-state database inspection (Compare the OSPF link-state database with the installed routing table.), not the specified action.

D:

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

Question 47

An OSPF domain must carry a route learned from an external protocol and identify the source as external to the OSPF area topology. A colleague instead suggests: Compare the OSPF link-state database with the installed routing table. Which corrective approach most directly addresses the original issue?

  1. Adjust the relevant OSPF interface cost to express the desired preferred path.
  2. Redistribute the selected external route using a controlled OSPF export policy on an ASBR.
  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

B:

This corrective choice addresses ASBR external injection. Eligible external prefixes can be originated as OSPF external routing information.

Incorrect Answers

A:

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.

D:

That alternative applies to Link-state database inspection instead. The operator can distinguish missing topology advertisements from a later route selection issue.

Question 48

An enterprise network designer recommends: Redistribute the selected external route using a controlled OSPF export policy on an ASBR. Which situation most clearly calls for this action?

  1. A router loses a directly connected OSPF link and other area members continue forwarding on obsolete topology until they receive an update.
  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 route is missing from the OSPF routing table and the engineer must determine whether its LSA is present at all.

Explanation

Correct Answer

C:

This case requires the ASBR external injection action. Eligible external prefixes can be originated as OSPF external routing information.

Incorrect Answers

A:

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.

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.

D:

This other case would be better matched to Compare the OSPF link-state database with the installed routing table. The operator can distinguish missing topology advertisements from a later route selection issue.

Question 49

A branch OSPF area must avoid ordinary external type 5 LSAs but allow limited local external injection. Which Junos networking action or protocol decision best addresses this requirement?

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

Explanation

Correct Answer

D:

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

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 NSSA external route requirement.

B:

That action targets Backbone area connectivity: Interarea exchange can traverse a continuous logical backbone as OSPF requires. It does not directly resolve the stated NSSA external route requirement.

C:

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

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.

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