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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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"Enterprise Routing and Switching, Professional (JNCIP-ENT) Exam", also known as JN0-650 exam, is a Juniper certification exam.

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Juniper JN0-650 Practice Test 1

Question 1

Two directly connected Junos routers never become OSPF neighbors because one interface is assigned to area 0 and the other to area 1. Which Junos networking action or protocol decision best addresses this requirement?

  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. Configure compatible Hello and dead intervals on both connected OSPF interfaces.
  4. Place both peering interfaces in the same intended OSPF area.

Explanation

Correct Answer

D:

This action addresses OSPF area mismatch. The peers can proceed toward an adjacency when their area identifiers match.

Incorrect Answers

A:

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 area mismatch requirement.

B:

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 area mismatch requirement.

C:

That action targets OSPF timer mismatch: OSPF neighbor compatibility checks can pass the timer parameters. It does not directly resolve the stated OSPF area mismatch requirement.

Question 2

A Junos network engineer takes this step: Place both peering interfaces in the same intended OSPF area. 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 processing can start on the specified link and discover eligible neighbors.
  4. OSPF neighbor compatibility checks can pass the timer parameters.

Explanation

Correct Answer

A:

This is the direct result of the OSPF area mismatch decision: The peers can proceed toward an adjacency when their area identifiers match.

Incorrect Answers

B:

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

C:

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

D:

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

Question 3

Two directly connected Junos routers never become OSPF neighbors because one interface is assigned to area 0 and the other to area 1. A colleague instead suggests: Make the LAN-facing OSPF interface passive while preserving its prefix advertisement. Which corrective approach most directly addresses the original issue?

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

Explanation

Correct Answer

B:

This corrective choice addresses OSPF area mismatch. The peers can proceed toward an adjacency when their area identifiers match.

Incorrect Answers

A:

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 timer mismatch instead. OSPF neighbor compatibility checks can pass the timer parameters.

D:

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.

Question 4

An enterprise network designer recommends: Place both peering interfaces in the same intended OSPF area. Which situation most clearly calls for this action?

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

Explanation

Correct Answer

C:

This case requires the OSPF area mismatch action. The peers can proceed toward an adjacency when their area identifiers match.

Incorrect Answers

A:

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.

B:

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 Configure compatible Hello and dead intervals on both connected OSPF interfaces. OSPF neighbor compatibility checks can pass the timer parameters.

Question 5

OSPF Hello packets arrive but neighboring interfaces use different authentication settings and no adjacency forms. Which Junos networking action or protocol decision best addresses this requirement?

  1. Assign a unique stable router ID to each OSPF speaker.
  2. Inspect OSPF neighbor status and interface details with operational show commands.
  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

D:

This action addresses OSPF authentication mismatch. Matching authentication lets correctly authenticated protocol packets participate in adjacency establishment.

Incorrect Answers

A:

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 authentication mismatch requirement.

B:

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 authentication mismatch requirement.

C:

That action targets OSPF MTU disagreement: Compatible MTUs remove a common cause of OSPF database-description exchange failures. It does not directly resolve the stated OSPF authentication mismatch requirement.

Question 6

A Junos network engineer takes this step: Align the supported OSPF authentication method and credentials across the link. Which outcome most directly follows?

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

Explanation

Correct Answer

A:

This is the direct result of the OSPF authentication mismatch decision: Matching authentication lets correctly authenticated protocol packets participate in adjacency establishment.

Incorrect Answers

B:

This outcome is associated with OSPF MTU disagreement (Correct the interface MTU mismatch on the two ends before attempting full database synchronization.), not the specified action.

C:

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

D:

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

Question 7

OSPF Hello packets arrive but neighboring interfaces use different authentication settings and no adjacency forms. A colleague instead suggests: Correct the interface MTU mismatch on the two ends before attempting full database synchronization. Which corrective approach most directly addresses the original issue?

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

Explanation

Correct Answer

B:

This corrective choice addresses OSPF authentication mismatch. Matching authentication lets correctly authenticated protocol packets participate in adjacency establishment.

Incorrect Answers

A:

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

C:

That alternative applies to OSPF MTU disagreement instead. Compatible MTUs remove a common cause of OSPF database-description exchange failures.

D:

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

Question 8

An enterprise network designer recommends: Align the supported OSPF authentication method and credentials across the link. Which situation most clearly calls for this action?

  1. Separate Junos routers in the same OSPF domain accidentally use an identical router ID and display unstable LSDB topology.
  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. A newly connected router reports no OSPF neighbors despite good interface and IP status, and the operator needs protocol-level evidence.

Explanation

Correct Answer

C:

This case requires the OSPF authentication mismatch action. Matching authentication lets correctly authenticated protocol packets participate in adjacency establishment.

Incorrect Answers

A:

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.

B:

This other case would be better matched to Correct the interface MTU mismatch on the two ends before attempting full database synchronization. Compatible MTUs remove a common cause of OSPF database-description exchange failures.

D:

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.

Question 9

An Ethernet segment must be advertised as connected infrastructure but no routing adjacency should form toward attached workstations. Which Junos networking action or protocol decision best addresses this requirement?

  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. Configure compatible Hello and dead intervals on both connected OSPF interfaces.
  4. Place both peering interfaces in the same intended OSPF area.

Explanation

Correct Answer

A:

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

Incorrect Answers

B:

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 Passive OSPF interface requirement.

C:

That action targets OSPF timer mismatch: OSPF neighbor compatibility checks can pass the timer parameters. It does not directly resolve the stated Passive OSPF interface 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 Passive OSPF interface requirement.

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.

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