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Juniper JN0-364 Practice Test 55

Question 540

A provider network team identifies this situation: A provider core route change sends the GRE endpoint toward its own tunnel. What verification evidence MOST CLEARLY demonstrates the solution is working? Choose ONE best answer.

  1. The IPv6 service behaves correctly for expected packet sizes
  2. The underlay uses a valid physical or independently routed path
  3. The remote endpoint is reached through a valid source route
  4. The diagnosed signaling fault is corrected without changing unrelated customer routing

Explanation

Correct Answer

B:

The underlay uses a valid physical or independently routed path is the best operational verification evidence for this Junos service-provider case: A provider core route change sends the GRE endpoint toward its own tunnel. Technical basis: The route to a GRE destination must resolve through the transport network, not through the same GRE tunnel.

Incorrect Answers

A:

The IPv6 service behaves correctly for expected packet sizes is relevant to the different engineering topic "GRE MTU and encapsulation overhead", but it is not the most directly supported operational verification evidence for this precise case: A provider core route change sends the GRE endpoint toward its own tunnel. the best answer here is: The underlay uses a valid physical or independently routed path.

C:

The remote endpoint is reached through a valid source route is relevant to the different engineering topic "GRE source and destination addressing", but it is not the most directly supported operational verification evidence for this precise case: A provider core route change sends the GRE endpoint toward its own tunnel. the best answer here is: The underlay uses a valid physical or independently routed path.

D:

That option concerns RSVP LSP signaling. The route to a GRE destination must resolve through the transport network, not through the same GRE tunnel.

Question 541

A Junos service-provider engineer is reviewing this operational case: A customer asks for a transparent routed overlay with strong confidentiality. Which technical approach MOST DIRECTLY addresses the issue? Select ONE best answer.

  1. Distinguish transport routes, MPLS forwarding entries and regular IP routing when troubleshooting
  2. Match GRE tunnel source/destination endpoints to reachable transport addresses
  3. Validate security and protocol support before selecting GRE for a service-provider application
  4. Account for added GRE and outer IP header overhead when sizing tunneled traffic

Explanation

Correct Answer

C:

Validate security and protocol support before selecting GRE for a service-provider application is the best technical design or decision for this Junos service-provider case: A customer asks for a transparent routed overlay with strong confidentiality. Technical basis: GRE is a flexible encapsulation mechanism, not inherently authenticated, encrypted or guaranteed for every platform feature.

Incorrect Answers

A:

That option concerns MPLS route and forwarding tables. GRE is a flexible encapsulation mechanism, not inherently authenticated, encrypted or guaranteed for every platform feature.

B:

Match GRE tunnel source/destination endpoints to reachable transport addresses is relevant to the different engineering topic "GRE source and destination addressing", but it is not the most directly supported technical design or decision for this precise case: A customer asks for a transparent routed overlay with strong confidentiality. the best answer here is: Validate security and protocol support before selecting GRE for a service-provider application.

D:

Account for added GRE and outer IP header overhead when sizing tunneled traffic is relevant to the different engineering topic "GRE MTU and encapsulation overhead", but it is not the most directly supported technical design or decision for this precise case: A customer asks for a transparent routed overlay with strong confidentiality. the best answer here is: Validate security and protocol support before selecting GRE for a service-provider application.

Question 542

A Junos service-provider engineer is reviewing this operational case: A customer asks for a transparent routed overlay with strong confidentiality. What specific configuration or diagnostic action BEST implements the intended response? Select ONE best answer.

  1. Inspect tunnel interface, encapsulation routes and return route availability
  2. Review tunnel MTU and supported PMTUD handling
  3. Enable the supported IPv6 family and verify route policy
  4. Assess supported IPsec or other secure transport in addition to GRE if appropriate

Explanation

Correct Answer

D:

Assess supported IPsec or other secure transport in addition to GRE if appropriate is the best implementation and troubleshooting step for this Junos service-provider case: A customer asks for a transparent routed overlay with strong confidentiality. Technical basis: GRE is a flexible encapsulation mechanism, not inherently authenticated, encrypted or guaranteed for every platform feature.

Incorrect Answers

A:

Inspect tunnel interface, encapsulation routes and return route availability is relevant to the different engineering topic "GRE tunnel forwarding tests", but it is not the most directly supported implementation and troubleshooting step for this precise case: A customer asks for a transparent routed overlay with strong confidentiality. the best answer here is: Assess supported IPsec or other secure transport in addition to GRE if appropriate.

B:

Review tunnel MTU and supported PMTUD handling is relevant to the different engineering topic "GRE MTU and encapsulation overhead", but it is not the most directly supported implementation and troubleshooting step for this precise case: A customer asks for a transparent routed overlay with strong confidentiality. the best answer here is: Assess supported IPsec or other secure transport in addition to GRE if appropriate.

C:

That option concerns BGP IPv6 unicast family. GRE is a flexible encapsulation mechanism, not inherently authenticated, encrypted or guaranteed for every platform feature.

Question 543

A Junos service-provider engineer is reviewing this operational case: A customer asks for a transparent routed overlay with strong confidentiality. Which observation would MOST RELIABLY verify the intended outcome? Select ONE best answer.

  1. The tunnel stays operational without recursive next-hop resolution
  2. Flooding decreases once the destination MAC is learned
  3. The design meets both reachability and confidentiality requirements
  4. Encapsulated packets arrive at the intended peer

Explanation

Correct Answer

C:

The design meets both reachability and confidentiality requirements is the best operational verification evidence for this Junos service-provider case: A customer asks for a transparent routed overlay with strong confidentiality. Technical basis: GRE is a flexible encapsulation mechanism, not inherently authenticated, encrypted or guaranteed for every platform feature.

Incorrect Answers

A:

That option concerns GRE underlay route recursion. GRE is a flexible encapsulation mechanism, not inherently authenticated, encrypted or guaranteed for every platform feature.

B:

That option concerns Unknown unicast and flooding. GRE is a flexible encapsulation mechanism, not inherently authenticated, encrypted or guaranteed for every platform feature.

D:

Encapsulated packets arrive at the intended peer is relevant to the different engineering topic "GRE source and destination addressing", but it is not the most directly supported operational verification evidence for this precise case: A customer asks for a transparent routed overlay with strong confidentiality. the best answer here is: The design meets both reachability and confidentiality requirements.

Question 544

A provider network team identifies this situation: A firewall begins dropping GRE after a policy change. Which engineering decision BEST fits the stated requirement? Choose ONE best answer.

  1. Test both overlay reachability and underlay encapsulated packet delivery during troubleshooting
  2. Match GRE tunnel source/destination endpoints to reachable transport addresses
  3. Validate security and protocol support before selecting GRE for a service-provider application
  4. Check correct edge designation and port roles before overriding an STP blocking decision

Explanation

Correct Answer

C:

Validate security and protocol support before selecting GRE for a service-provider application is the best technical design or decision for this Junos service-provider case: A firewall begins dropping GRE after a policy change. Technical basis: GRE is a flexible encapsulation mechanism, not inherently authenticated, encrypted or guaranteed for every platform feature.

Incorrect Answers

A:

Test both overlay reachability and underlay encapsulated packet delivery during troubleshooting is relevant to the different engineering topic "GRE tunnel forwarding tests", but it is not the most directly supported technical design or decision for this precise case: A firewall begins dropping GRE after a policy change. the best answer here is: Validate security and protocol support before selecting GRE for a service-provider application.

B:

Match GRE tunnel source/destination endpoints to reachable transport addresses is relevant to the different engineering topic "GRE source and destination addressing", but it is not the most directly supported technical design or decision for this precise case: A firewall begins dropping GRE after a policy change. the best answer here is: Validate security and protocol support before selecting GRE for a service-provider application.

D:

That option concerns Spanning-tree troubleshooting and edge settings. GRE is a flexible encapsulation mechanism, not inherently authenticated, encrypted or guaranteed for every platform feature.

Question 545

A provider network team identifies this situation: A firewall begins dropping GRE after a policy change. Which implementation or troubleshooting step is MOST APPROPRIATE here? Choose ONE best answer.

  1. Verify IP protocol handling and security policy rather than changing only TCP port rules
  2. Review reverse underlay reachability and filter policy at both ends
  3. Check show ospf interface and link/IP state first
  4. Compare encapsulation overhead and effective tunnel MTU

Explanation

Correct Answer

A:

Verify IP protocol handling and security policy rather than changing only TCP port rules is the best implementation and troubleshooting step for this Junos service-provider case: A firewall begins dropping GRE after a policy change. Technical basis: GRE is a flexible encapsulation mechanism, not inherently authenticated, encrypted or guaranteed for every platform feature.

Incorrect Answers

B:

Review reverse underlay reachability and filter policy at both ends is relevant to the different engineering topic "GRE tunnel forwarding tests", but it is not the most directly supported implementation and troubleshooting step for this precise case: A firewall begins dropping GRE after a policy change. the best answer here is: Verify IP protocol handling and security policy rather than changing only TCP port rules.

C:

That option concerns OSPF operational troubleshooting. GRE is a flexible encapsulation mechanism, not inherently authenticated, encrypted or guaranteed for every platform feature.

D:

Compare encapsulation overhead and effective tunnel MTU is relevant to the different engineering topic "GRE MTU and encapsulation overhead", but it is not the most directly supported implementation and troubleshooting step for this precise case: A firewall begins dropping GRE after a policy change. the best answer here is: Verify IP protocol handling and security policy rather than changing only TCP port rules.

Question 546

A provider network team identifies this situation: A firewall begins dropping GRE after a policy change. What verification evidence MOST CLEARLY demonstrates the solution is working? Choose ONE best answer.

  1. Normal spanning-tree recovery follows correction of the control path
  2. The required permitted GRE protocol traffic traverses the underlay
  3. Bidirectional overlay packets are forwarded correctly
  4. The IPv6 service behaves correctly for expected packet sizes

Explanation

Correct Answer

B:

The required permitted GRE protocol traffic traverses the underlay is the best operational verification evidence for this Junos service-provider case: A firewall begins dropping GRE after a policy change. Technical basis: GRE is a flexible encapsulation mechanism, not inherently authenticated, encrypted or guaranteed for every platform feature.

Incorrect Answers

A:

That option concerns Loop protection when BPDUs vanish. GRE is a flexible encapsulation mechanism, not inherently authenticated, encrypted or guaranteed for every platform feature.

C:

Bidirectional overlay packets are forwarded correctly is relevant to the different engineering topic "GRE tunnel forwarding tests", but it is not the most directly supported operational verification evidence for this precise case: A firewall begins dropping GRE after a policy change. the best answer here is: The required permitted GRE protocol traffic traverses the underlay.

D:

The IPv6 service behaves correctly for expected packet sizes is relevant to the different engineering topic "GRE MTU and encapsulation overhead", but it is not the most directly supported operational verification evidence for this precise case: A firewall begins dropping GRE after a policy change. the best answer here is: The required permitted GRE protocol traffic traverses the underlay.

Question 547

A Junos service-provider engineer is reviewing this operational case: A GRE overlay ping fails while the outer endpoint can be reached via underlay. Which technical approach MOST DIRECTLY addresses the issue? Select ONE best answer.

  1. Use nonstop bridging with its platform-specific GRES dependency when L2 state continuity matters
  2. Match GRE tunnel source/destination endpoints to reachable transport addresses
  3. Test both overlay reachability and underlay encapsulated packet delivery during troubleshooting
  4. Keep GRE underlay reachability independent of overlay routes to avoid recursive routing loops

Explanation

Correct Answer

C:

Test both overlay reachability and underlay encapsulated packet delivery during troubleshooting is the best technical design or decision for this Junos service-provider case: A GRE overlay ping fails while the outer endpoint can be reached via underlay. Technical basis: A GRE interface can be configured yet fail to forward because routes, filters or endpoints are incorrect.

Incorrect Answers

A:

That option concerns Nonstop bridging during RE switchover. A GRE interface can be configured yet fail to forward because routes, filters or endpoints are incorrect.

B:

Match GRE tunnel source/destination endpoints to reachable transport addresses is relevant to the different engineering topic "GRE source and destination addressing", but it is not the most directly supported technical design or decision for this precise case: A GRE overlay ping fails while the outer endpoint can be reached via underlay. the best answer here is: Test both overlay reachability and underlay encapsulated packet delivery during troubleshooting.

D:

Keep GRE underlay reachability independent of overlay routes to avoid recursive routing loops is relevant to the different engineering topic "GRE underlay route recursion", but it is not the most directly supported technical design or decision for this precise case: A GRE overlay ping fails while the outer endpoint can be reached via underlay. the best answer here is: Test both overlay reachability and underlay encapsulated packet delivery during troubleshooting.

Question 548

A Junos service-provider engineer is reviewing this operational case: A GRE overlay ping fails while the outer endpoint can be reached via underlay. What specific configuration or diagnostic action BEST implements the intended response? Select ONE best answer.

  1. Inspect tunnel interface, encapsulation routes and return route availability
  2. Inspect route detail and ensure the authorized next-hop route exists
  3. Assess supported IPsec or other secure transport in addition to GRE if appropriate
  4. Review tunnel MTU and supported PMTUD handling

Explanation

Correct Answer

A:

Inspect tunnel interface, encapsulation routes and return route availability is the best implementation and troubleshooting step for this Junos service-provider case: A GRE overlay ping fails while the outer endpoint can be reached via underlay. Technical basis: A GRE interface can be configured yet fail to forward because routes, filters or endpoints are incorrect.

Incorrect Answers

B:

That option concerns BGP next-hop reachability. A GRE interface can be configured yet fail to forward because routes, filters or endpoints are incorrect.

C:

Assess supported IPsec or other secure transport in addition to GRE if appropriate is relevant to the different engineering topic "GRE protocol and security limitations", but it is not the most directly supported implementation and troubleshooting step for this precise case: A GRE overlay ping fails while the outer endpoint can be reached via underlay. the best answer here is: Inspect tunnel interface, encapsulation routes and return route availability.

D:

Review tunnel MTU and supported PMTUD handling is relevant to the different engineering topic "GRE MTU and encapsulation overhead", but it is not the most directly supported implementation and troubleshooting step for this precise case: A GRE overlay ping fails while the outer endpoint can be reached via underlay. the best answer here is: Inspect tunnel interface, encapsulation routes and return route availability.

Question 549

A Junos service-provider engineer is reviewing this operational case: A GRE overlay ping fails while the outer endpoint can be reached via underlay. Which observation would MOST RELIABLY verify the intended outcome? Select ONE best answer.

  1. The route is active and forwards IPv6 packets to the intended gateway
  2. The intended overlay packets appear within GRE encapsulation
  3. The overlay path works after repairing the correct layer
  4. Encapsulated packets arrive at the intended peer

Explanation

Correct Answer

C:

The overlay path works after repairing the correct layer is the best operational verification evidence for this Junos service-provider case: A GRE overlay ping fails while the outer endpoint can be reached via underlay. Technical basis: A GRE interface can be configured yet fail to forward because routes, filters or endpoints are incorrect.

Incorrect Answers

A:

That option concerns IPv6 static route next hop. A GRE interface can be configured yet fail to forward because routes, filters or endpoints are incorrect.

B:

The intended overlay packets appear within GRE encapsulation is relevant to the different engineering topic "GRE encapsulation purpose", but it is not the most directly supported operational verification evidence for this precise case: A GRE overlay ping fails while the outer endpoint can be reached via underlay. the best answer here is: The overlay path works after repairing the correct layer.

D:

Encapsulated packets arrive at the intended peer is relevant to the different engineering topic "GRE source and destination addressing", but it is not the most directly supported operational verification evidence for this precise case: A GRE overlay ping fails while the outer endpoint can be reached via underlay. the best answer here is: The overlay path works after repairing the correct layer.

Question 550

A provider network team identifies this situation: A tunnel carries pings one way but not return packets. Which engineering decision BEST fits the stated requirement? Choose ONE best answer.

  1. Account for added GRE and outer IP header overhead when sizing tunneled traffic
  2. Match GRE tunnel source/destination endpoints to reachable transport addresses
  3. Test both overlay reachability and underlay encapsulated packet delivery during troubleshooting
  4. Use BPDU protection at true edge ports to react to unexpected switches

Explanation

Correct Answer

C:

Test both overlay reachability and underlay encapsulated packet delivery during troubleshooting is the best technical design or decision for this Junos service-provider case: A tunnel carries pings one way but not return packets. Technical basis: A GRE interface can be configured yet fail to forward because routes, filters or endpoints are incorrect.

Incorrect Answers

A:

Account for added GRE and outer IP header overhead when sizing tunneled traffic is relevant to the different engineering topic "GRE MTU and encapsulation overhead", but it is not the most directly supported technical design or decision for this precise case: A tunnel carries pings one way but not return packets. the best answer here is: Test both overlay reachability and underlay encapsulated packet delivery during troubleshooting.

B:

Match GRE tunnel source/destination endpoints to reachable transport addresses is relevant to the different engineering topic "GRE source and destination addressing", but it is not the most directly supported technical design or decision for this precise case: A tunnel carries pings one way but not return packets. the best answer here is: Test both overlay reachability and underlay encapsulated packet delivery during troubleshooting.

D:

That option concerns BPDU protection for edge ports. A GRE interface can be configured yet fail to forward because routes, filters or endpoints are incorrect.

Service Provider Routing and Switching, Specialist (JNCIS-SP) (JN0-364) Practice Tests