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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 2

Question 10

A Junos network engineer takes this step: Make the LAN-facing OSPF interface passive while preserving its prefix advertisement. Which outcome most directly follows?

  1. The peers can proceed toward an adjacency when their area identifiers match.
  2. The prefix can be included in OSPF without sending Hello packets to end hosts on that segment.
  3. OSPF neighbor compatibility checks can pass the timer parameters.
  4. OSPF processing can start on the specified link and discover eligible neighbors.

Explanation

Correct Answer

B:

This is the direct result of the Passive OSPF interface decision: The prefix can be included in OSPF without sending Hello packets to end hosts on that segment.

Incorrect Answers

A:

This outcome is associated with OSPF area mismatch (Place both peering interfaces in the same intended OSPF area.), not the specified action.

C:

This outcome is associated with OSPF timer mismatch (Configure compatible Hello and dead intervals on both connected OSPF interfaces.), not the specified action.

D:

This outcome is associated with Missing OSPF interface (Add the correct routed interface under the appropriate Junos OSPF area configuration.), not the specified action.

Question 11

An Ethernet segment must be advertised as connected infrastructure but no routing adjacency should form toward attached workstations. A colleague instead suggests: Configure compatible Hello and dead intervals on both connected OSPF interfaces. Which corrective approach most directly addresses the original issue?

  1. Place both peering interfaces in the same intended OSPF area.
  2. Configure compatible Hello and dead intervals on both connected OSPF interfaces.
  3. Make the LAN-facing OSPF interface passive while preserving its prefix advertisement.
  4. Add the correct routed interface under the appropriate Junos OSPF area configuration.

Explanation

Correct Answer

C:

This corrective choice addresses Passive OSPF interface. The prefix can be included in OSPF without sending Hello packets to end hosts on that segment.

Incorrect Answers

A:

That alternative applies to OSPF area mismatch instead. The peers can proceed toward an adjacency when their area identifiers match.

B:

That alternative applies to OSPF timer mismatch instead. OSPF neighbor compatibility checks can pass the timer parameters.

D:

That alternative applies to Missing OSPF interface instead. OSPF processing can start on the specified link and discover eligible neighbors.

Question 12

An enterprise network designer recommends: Make the LAN-facing OSPF interface passive while preserving its prefix advertisement. Which situation most clearly calls for this action?

  1. Two directly connected Junos routers never become OSPF neighbors because one interface is assigned to area 0 and the other to area 1.
  2. The Junos interface has IPv4 reachability but never sends OSPF Hellos because it was omitted from the intended OSPF area.
  3. A packet capture shows OSPF Hellos on a connected link but a neighbor adjacency never forms because Hello and dead timer settings differ.
  4. An Ethernet segment must be advertised as connected infrastructure but no routing adjacency should form toward attached workstations.

Explanation

Correct Answer

D:

This case requires the Passive OSPF interface action. The prefix can be included in OSPF without sending Hello packets to end hosts on that segment.

Incorrect Answers

A:

This other case would be better matched to Place both peering interfaces in the same intended OSPF area. The peers can proceed toward an adjacency when their area identifiers match.

B:

This other case would be better matched to Add the correct routed interface under the appropriate Junos OSPF area configuration. OSPF processing can start on the specified link and discover eligible neighbors.

C:

This other case would be better matched to Configure compatible Hello and dead intervals on both connected OSPF interfaces. OSPF neighbor compatibility checks can pass the timer parameters.

Question 13

Two OSPF routers reach ExStart and fail to finish database description negotiation over a link with unequal MTUs. Which Junos networking action or protocol decision best addresses this requirement?

  1. Inspect OSPF neighbor status and interface details with operational show commands.
  2. Assign a unique stable router ID to each OSPF speaker.
  3. Correct the interface MTU mismatch on the two ends before attempting full database synchronization.
  4. Align the supported OSPF authentication method and credentials across the link.

Explanation

Correct Answer

C:

This action addresses OSPF MTU disagreement. Compatible MTUs remove a common cause of OSPF database-description exchange failures.

Incorrect Answers

A:

That action targets OSPF adjacency diagnostics: The operator can distinguish Down, Init, ExStart, Exchange, and Full adjacency states. It does not directly resolve the stated OSPF MTU disagreement requirement.

B:

That action targets Duplicate router IDs: Every router is identified unambiguously in the link-state topology database. It does not directly resolve the stated OSPF MTU disagreement requirement.

D:

That action targets OSPF authentication mismatch: Matching authentication lets correctly authenticated protocol packets participate in adjacency establishment. It does not directly resolve the stated OSPF MTU disagreement requirement.

Question 14

A Junos network engineer takes this step: Correct the interface MTU mismatch on the two ends before attempting full database synchronization. Which outcome most directly follows?

  1. The operator can distinguish Down, Init, ExStart, Exchange, and Full adjacency states.
  2. Matching authentication lets correctly authenticated protocol packets participate in adjacency establishment.
  3. Every router is identified unambiguously in the link-state topology database.
  4. Compatible MTUs remove a common cause of OSPF database-description exchange failures.

Explanation

Correct Answer

D:

This is the direct result of the OSPF MTU disagreement decision: Compatible MTUs remove a common cause of OSPF database-description exchange failures.

Incorrect Answers

A:

This outcome is associated with OSPF adjacency diagnostics (Inspect OSPF neighbor status and interface details with operational show commands.), not the specified action.

B:

This outcome is associated with OSPF authentication mismatch (Align the supported OSPF authentication method and credentials across the link.), not the specified action.

C:

This outcome is associated with Duplicate router IDs (Assign a unique stable router ID to each OSPF speaker.), not the specified action.

Question 15

Two OSPF routers reach ExStart and fail to finish database description negotiation over a link with unequal MTUs. A colleague instead suggests: Assign a unique stable router ID to each OSPF speaker. Which corrective approach most directly addresses the original issue?

  1. Correct the interface MTU mismatch on the two ends before attempting full database synchronization.
  2. Assign a unique stable router ID to each OSPF speaker.
  3. Align the supported OSPF authentication method and credentials across the link.
  4. Inspect OSPF neighbor status and interface details with operational show commands.

Explanation

Correct Answer

A:

This corrective choice addresses OSPF MTU disagreement. Compatible MTUs remove a common cause of OSPF database-description exchange failures.

Incorrect Answers

B:

That alternative applies to Duplicate router IDs instead. Every router is identified unambiguously in the link-state topology database.

C:

That alternative applies to OSPF authentication mismatch instead. Matching authentication lets correctly authenticated protocol packets participate in adjacency establishment.

D:

That alternative applies to OSPF adjacency diagnostics instead. The operator can distinguish Down, Init, ExStart, Exchange, and Full adjacency states.

Question 16

An enterprise network designer recommends: Correct the interface MTU mismatch on the two ends before attempting full database synchronization. Which situation most clearly calls for this action?

  1. A newly connected router reports no OSPF neighbors despite good interface and IP status, and the operator needs protocol-level evidence.
  2. Two OSPF routers reach ExStart and fail to finish database description negotiation over a link with unequal MTUs.
  3. OSPF Hello packets arrive but neighboring interfaces use different authentication settings and no adjacency forms.
  4. Separate Junos routers in the same OSPF domain accidentally use an identical router ID and display unstable LSDB topology.

Explanation

Correct Answer

B:

This case requires the OSPF MTU disagreement action. Compatible MTUs remove a common cause of OSPF database-description exchange failures.

Incorrect Answers

A:

This other case would be better matched to Inspect OSPF neighbor status and interface details with operational show commands. The operator can distinguish Down, Init, ExStart, Exchange, and Full adjacency states.

C:

This other case would be better matched to Align the supported OSPF authentication method and credentials across the link. Matching authentication lets correctly authenticated protocol packets participate in adjacency establishment.

D:

This other case would be better matched to Assign a unique stable router ID to each OSPF speaker. Every router is identified unambiguously in the link-state topology database.

Question 17

A packet capture shows OSPF Hellos on a connected link but a neighbor adjacency never forms because Hello and dead timer settings differ. Which Junos networking action or protocol decision best addresses this requirement?

  1. Add the correct routed interface under the appropriate Junos OSPF area configuration.
  2. Configure compatible Hello and dead intervals on both connected OSPF interfaces.
  3. Make the LAN-facing OSPF interface passive while preserving its prefix advertisement.
  4. Place both peering interfaces in the same intended OSPF area.

Explanation

Correct Answer

B:

This action addresses OSPF timer mismatch. OSPF neighbor compatibility checks can pass the timer parameters.

Incorrect Answers

A:

That action targets Missing OSPF interface: OSPF processing can start on the specified link and discover eligible neighbors. It does not directly resolve the stated OSPF timer mismatch requirement.

C:

That action targets Passive OSPF interface: The prefix can be included in OSPF without sending Hello packets to end hosts on that segment. It does not directly resolve the stated OSPF timer mismatch requirement.

D:

That action targets OSPF area mismatch: The peers can proceed toward an adjacency when their area identifiers match. It does not directly resolve the stated OSPF timer mismatch requirement.

Question 18

A Junos network engineer takes this step: Configure compatible Hello and dead intervals on both connected OSPF interfaces. Which outcome most directly follows?

  1. The prefix can be included in OSPF without sending Hello packets to end hosts on that segment.
  2. The peers can proceed toward an adjacency when their area identifiers match.
  3. OSPF neighbor compatibility checks can pass the timer parameters.
  4. OSPF processing can start on the specified link and discover eligible neighbors.

Explanation

Correct Answer

C:

This is the direct result of the OSPF timer mismatch decision: OSPF neighbor compatibility checks can pass the timer parameters.

Incorrect Answers

A:

This outcome is associated with Passive OSPF interface (Make the LAN-facing OSPF interface passive while preserving its prefix advertisement.), not the specified action.

B:

This outcome is associated with OSPF area mismatch (Place both peering interfaces in the same intended OSPF area.), not the specified action.

D:

This outcome is associated with Missing OSPF interface (Add the correct routed interface under the appropriate Junos OSPF area configuration.), not the specified action.

Question 19

A packet capture shows OSPF Hellos on a connected link but a neighbor adjacency never forms because Hello and dead timer settings differ. A colleague instead suggests: Add the correct routed interface under the appropriate Junos OSPF area configuration. Which corrective approach most directly addresses the original issue?

  1. Make the LAN-facing OSPF interface passive while preserving its prefix advertisement.
  2. Add the correct routed interface under the appropriate Junos OSPF area configuration.
  3. Place both peering interfaces in the same intended OSPF area.
  4. Configure compatible Hello and dead intervals on both connected OSPF interfaces.

Explanation

Correct Answer

D:

This corrective choice addresses OSPF timer mismatch. OSPF neighbor compatibility checks can pass the timer parameters.

Incorrect Answers

A:

That alternative applies to Passive OSPF interface instead. The prefix can be included in OSPF without sending Hello packets to end hosts on that segment.

B:

That alternative applies to Missing OSPF interface instead. OSPF processing can start on the specified link and discover eligible neighbors.

C:

That alternative applies to OSPF area mismatch instead. The peers can proceed toward an adjacency when their area identifiers match.

Question 20

An enterprise network designer recommends: Configure compatible Hello and dead intervals on both connected OSPF interfaces. Which situation most clearly calls for this action?

  1. A packet capture shows OSPF Hellos on a connected link but a neighbor adjacency never forms because Hello and dead timer settings differ.
  2. Two directly connected Junos routers never become OSPF neighbors because one interface is assigned to area 0 and the other to area 1.
  3. An Ethernet segment must be advertised as connected infrastructure but no routing adjacency should form toward attached workstations.
  4. The Junos interface has IPv4 reachability but never sends OSPF Hellos because it was omitted from the intended OSPF area.

Explanation

Correct Answer

A:

This case requires the OSPF timer mismatch action. OSPF neighbor compatibility checks can pass the timer parameters.

Incorrect Answers

B:

This other case would be better matched to Place both peering interfaces in the same intended OSPF area. The peers can proceed toward an adjacency when their area identifiers match.

C:

This other case would be better matched to Make the LAN-facing OSPF interface passive while preserving its prefix advertisement. The prefix can be included in OSPF without sending Hello packets to end hosts on that segment.

D:

This other case would be better matched to Add the correct routed interface under the appropriate Junos OSPF area configuration. OSPF processing can start on the specified link and discover eligible neighbors.

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