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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 7

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.

Question 61

A router loses a directly connected OSPF link and other area members continue forwarding on obsolete topology until they receive an update. 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. Adjust the relevant OSPF interface cost to express the desired preferred path.
  3. Redistribute the selected external route using a controlled OSPF export policy on an ASBR.
  4. Compare the OSPF link-state database with the installed routing table.

Explanation

Correct Answer

A:

This action addresses OSPF topology change propagation. The routers can recalculate shortest paths from a consistent view of the changed topology.

Incorrect Answers

B:

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 OSPF topology change propagation 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 OSPF topology change propagation requirement.

D:

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 OSPF topology change propagation requirement.

Question 62

A Junos network engineer takes this step: Allow updated link-state advertisements to flood and each router to recompute SPF. 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

B:

This is the direct result of the OSPF topology change propagation decision: The routers can recalculate shortest paths from a consistent view of the changed topology.

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.

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

Question 63

A router loses a directly connected OSPF link and other area members continue forwarding on obsolete topology until they receive an update. A colleague instead suggests: Adjust the relevant OSPF interface cost to express the desired preferred path. 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

C:

This corrective choice addresses OSPF topology change propagation. The routers can recalculate shortest paths from a consistent view of the changed topology.

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.

D:

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

Question 64

An enterprise network designer recommends: Allow updated link-state advertisements to flood and each router to recompute SPF. 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

D:

This case requires the OSPF topology change propagation action. The routers can recalculate shortest paths from a consistent view of the changed topology.

Incorrect Answers

A:

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.

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.

Question 65

An enterprise has IPv6 interface addresses but only OSPFv2 has been enabled for the existing IPv4 routing domain. Which Junos networking action or protocol decision best addresses this requirement?

  1. Align the intended OSPFv3 interface area numbers on the adjacent routers.
  2. Use Junos OSPFv3 operational neighbor and interface inspection rather than only pinging IPv6 addresses.
  3. Configure a supported interarea IPv6 route summary for the appropriate OSPFv3 area.
  4. Configure the applicable Junos OSPFv3 process and IPv6 interfaces in the correct area.

Explanation

Correct Answer

D:

This action addresses OSPFv3 IPv6 routing. OSPFv3 can exchange supported IPv6 routing information across the configured links.

Incorrect Answers

A:

That action targets OSPFv3 area mismatch: The area-identifier mismatch no longer prevents the OSPFv3 adjacency. It does not directly resolve the stated OSPFv3 IPv6 routing requirement.

B:

That action targets OSPFv3 neighbor visibility: The engineer can see adjacency state and whether OSPFv3 runs on the expected interface. It does not directly resolve the stated OSPFv3 IPv6 routing requirement.

C:

That action targets IPv6 route summarization: Downstream routers can learn an aggregate IPv6 prefix rather than every component network. It does not directly resolve the stated OSPFv3 IPv6 routing requirement.

Question 66

A Junos network engineer takes this step: Configure the applicable Junos OSPFv3 process and IPv6 interfaces in the correct area. Which outcome most directly follows?

  1. OSPFv3 can exchange supported IPv6 routing information across the configured links.
  2. The engineer can see adjacency state and whether OSPFv3 runs on the expected interface.
  3. The area-identifier mismatch no longer prevents the OSPFv3 adjacency.
  4. Downstream routers can learn an aggregate IPv6 prefix rather than every component network.

Explanation

Correct Answer

A:

This is the direct result of the OSPFv3 IPv6 routing decision: OSPFv3 can exchange supported IPv6 routing information across the configured links.

Incorrect Answers

B:

This outcome is associated with OSPFv3 neighbor visibility (Use Junos OSPFv3 operational neighbor and interface inspection rather than only pinging IPv6 addresses.), not the specified action.

C:

This outcome is associated with OSPFv3 area mismatch (Align the intended OSPFv3 interface area numbers on the adjacent routers.), not the specified action.

D:

This outcome is associated with IPv6 route summarization (Configure a supported interarea IPv6 route summary for the appropriate OSPFv3 area.), not the specified action.

Question 67

An enterprise has IPv6 interface addresses but only OSPFv2 has been enabled for the existing IPv4 routing domain. A colleague instead suggests: Align the intended OSPFv3 interface area numbers on the adjacent routers. Which corrective approach most directly addresses the original issue?

  1. Align the intended OSPFv3 interface area numbers on the adjacent routers.
  2. Configure the applicable Junos OSPFv3 process and IPv6 interfaces in the correct area.
  3. Use Junos OSPFv3 operational neighbor and interface inspection rather than only pinging IPv6 addresses.
  4. Configure a supported interarea IPv6 route summary for the appropriate OSPFv3 area.

Explanation

Correct Answer

B:

This corrective choice addresses OSPFv3 IPv6 routing. OSPFv3 can exchange supported IPv6 routing information across the configured links.

Incorrect Answers

A:

That alternative applies to OSPFv3 area mismatch instead. The area-identifier mismatch no longer prevents the OSPFv3 adjacency.

C:

That alternative applies to OSPFv3 neighbor visibility instead. The engineer can see adjacency state and whether OSPFv3 runs on the expected interface.

D:

That alternative applies to IPv6 route summarization instead. Downstream routers can learn an aggregate IPv6 prefix rather than every component network.

Question 68

An enterprise network designer recommends: Configure the applicable Junos OSPFv3 process and IPv6 interfaces in the correct area. Which situation most clearly calls for this action?

  1. An IPv6 subnet has intermittent OSPFv3 forwarding and operations needs evidence of the actual neighbor FSM.
  2. Two IPv6 routers exchange OSPFv3 Hellos but one interface belongs to area 0.0.0.2 and the other to area 0.0.0.0.
  3. An enterprise has IPv6 interface addresses but only OSPFv2 has been enabled for the existing IPv4 routing domain.
  4. An OSPFv3 area border router exports many contiguous IPv6 networks into the backbone and the design requires fewer interarea entries.

Explanation

Correct Answer

C:

This case requires the OSPFv3 IPv6 routing action. OSPFv3 can exchange supported IPv6 routing information across the configured links.

Incorrect Answers

A:

This other case would be better matched to Use Junos OSPFv3 operational neighbor and interface inspection rather than only pinging IPv6 addresses. The engineer can see adjacency state and whether OSPFv3 runs on the expected interface.

B:

This other case would be better matched to Align the intended OSPFv3 interface area numbers on the adjacent routers. The area-identifier mismatch no longer prevents the OSPFv3 adjacency.

D:

This other case would be better matched to Configure a supported interarea IPv6 route summary for the appropriate OSPFv3 area. Downstream routers can learn an aggregate IPv6 prefix rather than every component network.

Question 69

An OSPFv3 peering troubleshooter assumes neighbors must use their global IPv6 addresses for all Hello exchanges. Which Junos networking action or protocol decision best addresses this requirement?

  1. Check the interface link-local IPv6 communication used by OSPFv3 neighboring.
  2. Use Junos OSPFv3 operational neighbor and interface inspection rather than only pinging IPv6 addresses.
  3. Apply an appropriate export policy to the OSPFv3 instance for the selected IPv6 route.
  4. Configure a supported interarea IPv6 route summary for the appropriate OSPFv3 area.

Explanation

Correct Answer

A:

This action addresses OSPFv3 link-local adjacency. Link-local addressing supports OSPFv3 adjacency on the same link.

Incorrect Answers

B:

That action targets OSPFv3 neighbor visibility: The engineer can see adjacency state and whether OSPFv3 runs on the expected interface. It does not directly resolve the stated OSPFv3 link-local adjacency requirement.

C:

That action targets OSPFv3 IPv6 external: Selected external IPv6 reachability can be advertised into OSPFv3 rather than leaking all static routes. It does not directly resolve the stated OSPFv3 link-local adjacency requirement.

D:

That action targets IPv6 route summarization: Downstream routers can learn an aggregate IPv6 prefix rather than every component network. It does not directly resolve the stated OSPFv3 link-local adjacency requirement.

Question 70

A Junos network engineer takes this step: Check the interface link-local IPv6 communication used by OSPFv3 neighboring. Which outcome most directly follows?

  1. Downstream routers can learn an aggregate IPv6 prefix rather than every component network.
  2. Link-local addressing supports OSPFv3 adjacency on the same link.
  3. Selected external IPv6 reachability can be advertised into OSPFv3 rather than leaking all static routes.
  4. The engineer can see adjacency state and whether OSPFv3 runs on the expected interface.

Explanation

Correct Answer

B:

This is the direct result of the OSPFv3 link-local adjacency decision: Link-local addressing supports OSPFv3 adjacency on the same link.

Incorrect Answers

A:

This outcome is associated with IPv6 route summarization (Configure a supported interarea IPv6 route summary for the appropriate OSPFv3 area.), not the specified action.

C:

This outcome is associated with OSPFv3 IPv6 external (Apply an appropriate export policy to the OSPFv3 instance for the selected IPv6 route.), not the specified action.

D:

This outcome is associated with OSPFv3 neighbor visibility (Use Junos OSPFv3 operational neighbor and interface inspection rather than only pinging IPv6 addresses.), not the specified action.

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