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Juniper JN0-364 Practice Test 3

Question 20

A Junos service-provider engineer is reviewing this operational case: An edge router should originate a default only while a validated upstream path exists. What specific configuration or diagnostic action BEST implements the intended response? Select ONE best answer.

  1. Define contributing-route conditions and the intended generated route
  2. Confirm matching authentication parameters without exposing secret material
  3. Place relevant interfaces and route processing into separate configured instances
  4. Inspect the martian list and route handling before considering a justified exception

Explanation

Correct Answer

A:

Define contributing-route conditions and the intended generated route is the best implementation and troubleshooting step for this Junos service-provider case: An edge router should originate a default only while a validated upstream path exists. Technical basis: Generated routing can synthesize a route from active contributors while its eligibility depends on configuration and contributing route selection.

Incorrect Answers

B:

That option concerns IS-IS authentication checks. Generated routing can synthesize a route from active contributors while its eligibility depends on configuration and contributing route selection.

C:

Place relevant interfaces and route processing into separate configured instances is relevant to the different engineering topic "Routing-instance isolation", but it is not the most directly supported implementation and troubleshooting step for this precise case: An edge router should originate a default only while a validated upstream path exists. the best answer here is: Define contributing-route conditions and the intended generated route.

D:

Inspect the martian list and route handling before considering a justified exception is relevant to the different engineering topic "Martian-prefix handling", but it is not the most directly supported implementation and troubleshooting step for this precise case: An edge router should originate a default only while a validated upstream path exists. the best answer here is: Define contributing-route conditions and the intended generated route.

Question 21

A Junos service-provider engineer is reviewing this operational case: An edge router should originate a default only while a validated upstream path exists. Which observation would MOST RELIABLY verify the intended outcome? Select ONE best answer.

  1. The cause is narrowed to advertisement, rejection or route selection
  2. The invalid route remains excluded or a reviewed exception is clearly scoped
  3. The advertised default withdraws when the required valid contribution disappears
  4. Only matched traffic uses the alternate forwarding context

Explanation

Correct Answer

C:

The advertised default withdraws when the required valid contribution disappears is the best operational verification evidence for this Junos service-provider case: An edge router should originate a default only while a validated upstream path exists. Technical basis: Generated routing can synthesize a route from active contributors while its eligibility depends on configuration and contributing route selection.

Incorrect Answers

A:

That option concerns BGP route-troubleshooting CLI. Generated routing can synthesize a route from active contributors while its eligibility depends on configuration and contributing route selection.

B:

The invalid route remains excluded or a reviewed exception is clearly scoped is relevant to the different engineering topic "Martian-prefix handling", but it is not the most directly supported operational verification evidence for this precise case: An edge router should originate a default only while a validated upstream path exists. the best answer here is: The advertised default withdraws when the required valid contribution disappears.

D:

Only matched traffic uses the alternate forwarding context is relevant to the different engineering topic "Filter-based forwarding", but it is not the most directly supported operational verification evidence for this precise case: An edge router should originate a default only while a validated upstream path exists. the best answer here is: The advertised default withdraws when the required valid contribution disappears.

Question 22

A provider network team identifies this situation: A generated summary unexpectedly carries an undesirable path after a provider change. Which engineering decision BEST fits the stated requirement? Choose ONE best answer.

  1. Trace labeled forwarding across ingress, transit and egress before treating a customer VPN problem as BGP-only
  2. Use generated routes when a synthesized route should depend on contributing route information under policy
  3. Choose the correct Junos routing instance and interface membership to keep customer reachability independent
  4. Create an aggregate route only when relevant contributing more-specific active routes justify the summary

Explanation

Correct Answer

B:

Use generated routes when a synthesized route should depend on contributing route information under policy is the best technical design or decision for this Junos service-provider case: A generated summary unexpectedly carries an undesirable path after a provider change. Technical basis: Generated routing can synthesize a route from active contributors while its eligibility depends on configuration and contributing route selection.

Incorrect Answers

A:

That option concerns MPLS end-to-end troubleshooting. Generated routing can synthesize a route from active contributors while its eligibility depends on configuration and contributing route selection.

C:

Choose the correct Junos routing instance and interface membership to keep customer reachability independent is relevant to the different engineering topic "Routing-instance isolation", but it is not the most directly supported technical design or decision for this precise case: A generated summary unexpectedly carries an undesirable path after a provider change. the best answer here is: Use generated routes when a synthesized route should depend on contributing route information under policy.

D:

Create an aggregate route only when relevant contributing more-specific active routes justify the summary is relevant to the different engineering topic "Aggregate-route contributor activation", but it is not the most directly supported technical design or decision for this precise case: A generated summary unexpectedly carries an undesirable path after a provider change. the best answer here is: Use generated routes when a synthesized route should depend on contributing route information under policy.

Question 23

A provider network team identifies this situation: A generated summary unexpectedly carries an undesirable path after a provider change. Which implementation or troubleshooting step is MOST APPROPRIATE here? Choose ONE best answer.

  1. Check interface routing-instance membership and installed forwarding context
  2. Inspect contributing route selection and applied generation policy
  3. Inspect received superior BPDUs and verify the correct boundary role
  4. Check active contributors and the aggregate route state, rather than forcing an unrelated static next hop

Explanation

Correct Answer

B:

Inspect contributing route selection and applied generation policy is the best implementation and troubleshooting step for this Junos service-provider case: A generated summary unexpectedly carries an undesirable path after a provider change. Technical basis: Generated routing can synthesize a route from active contributors while its eligibility depends on configuration and contributing route selection.

Incorrect Answers

A:

Check interface routing-instance membership and installed forwarding context is relevant to the different engineering topic "Routing-instance isolation", but it is not the most directly supported implementation and troubleshooting step for this precise case: A generated summary unexpectedly carries an undesirable path after a provider change. the best answer here is: Inspect contributing route selection and applied generation policy.

C:

That option concerns Root protection policy. Generated routing can synthesize a route from active contributors while its eligibility depends on configuration and contributing route selection.

D:

Check active contributors and the aggregate route state, rather than forcing an unrelated static next hop is relevant to the different engineering topic "Aggregate-route contributor activation", but it is not the most directly supported implementation and troubleshooting step for this precise case: A generated summary unexpectedly carries an undesirable path after a provider change. the best answer here is: Inspect contributing route selection and applied generation policy.

Question 24

A provider network team identifies this situation: A generated summary unexpectedly carries an undesirable path after a provider change. What verification evidence MOST CLEARLY demonstrates the solution is working? Choose ONE best answer.

  1. The generated path reflects approved active contributor information
  2. Forwarding changes according to configured path preference rather than random distribution
  3. The route is either correctly rejected or reaccepted by a focused configuration fix
  4. The required permitted GRE protocol traffic traverses the underlay

Explanation

Correct Answer

A:

The generated path reflects approved active contributor information is the best operational verification evidence for this Junos service-provider case: A generated summary unexpectedly carries an undesirable path after a provider change. Technical basis: Generated routing can synthesize a route from active contributors while its eligibility depends on configuration and contributing route selection.

Incorrect Answers

B:

That option concerns Qualified-next-hop selection. Generated routing can synthesize a route from active contributors while its eligibility depends on configuration and contributing route selection.

C:

That option concerns Active-route versus hidden-route triage. Generated routing can synthesize a route from active contributors while its eligibility depends on configuration and contributing route selection.

D:

That option concerns GRE protocol and security limitations. Generated routing can synthesize a route from active contributors while its eligibility depends on configuration and contributing route selection.

Question 25

A Junos service-provider engineer is reviewing this operational case: An upstream test advertises a network that Junos classifies as martian. Which technical approach MOST DIRECTLY addresses the issue? Select ONE best answer.

  1. Use the IS-IS overload bit to discourage unwanted transit through a router during constrained operation
  2. Use a resolvable next hop for a Junos static route instead of assuming a configured route is automatically active
  3. Use filter-based forwarding on eligible incoming traffic to steer matching packets into the intended routing context
  4. Check martian address policy before assuming every prefix is eligible to enter the routing table

Explanation

Correct Answer

D:

Check martian address policy before assuming every prefix is eligible to enter the routing table is the best technical design or decision for this Junos service-provider case: An upstream test advertises a network that Junos classifies as martian. Technical basis: Martian routes classify prohibited or exceptional destination prefixes and can affect route acceptance or installation.

Incorrect Answers

A:

That option concerns IS-IS overload bit maintenance. Martian routes classify prohibited or exceptional destination prefixes and can affect route acceptance or installation.

B:

That option concerns Static-route next-hop resolution. Martian routes classify prohibited or exceptional destination prefixes and can affect route acceptance or installation.

C:

Use filter-based forwarding on eligible incoming traffic to steer matching packets into the intended routing context is relevant to the different engineering topic "Filter-based forwarding", but it is not the most directly supported technical design or decision for this precise case: An upstream test advertises a network that Junos classifies as martian. the best answer here is: Check martian address policy before assuming every prefix is eligible to enter the routing table.

Question 26

A Junos service-provider engineer is reviewing this operational case: An upstream test advertises a network that Junos classifies as martian. What specific configuration or diagnostic action BEST implements the intended response? Select ONE best answer.

  1. Build a precise match and a supported routing-instance action with a safe fall-through
  2. Set qualified-next-hop preference intentionally and verify both gateway reachabilities
  3. Inspect the martian list and route handling before considering a justified exception
  4. Compare region name, revision and VLAN mapping

Explanation

Correct Answer

C:

Inspect the martian list and route handling before considering a justified exception is the best implementation and troubleshooting step for this Junos service-provider case: An upstream test advertises a network that Junos classifies as martian. Technical basis: Martian routes classify prohibited or exceptional destination prefixes and can affect route acceptance or installation.

Incorrect Answers

A:

Build a precise match and a supported routing-instance action with a safe fall-through is relevant to the different engineering topic "Filter-based forwarding", but it is not the most directly supported implementation and troubleshooting step for this precise case: An upstream test advertises a network that Junos classifies as martian. the best answer here is: Inspect the martian list and route handling before considering a justified exception.

B:

Set qualified-next-hop preference intentionally and verify both gateway reachabilities is relevant to the different engineering topic "Qualified-next-hop selection", but it is not the most directly supported implementation and troubleshooting step for this precise case: An upstream test advertises a network that Junos classifies as martian. the best answer here is: Inspect the martian list and route handling before considering a justified exception.

D:

That option concerns MSTP region consistency. Martian routes classify prohibited or exceptional destination prefixes and can affect route acceptance or installation.

Question 27

A Junos service-provider engineer is reviewing this operational case: An upstream test advertises a network that Junos classifies as martian. Which observation would MOST RELIABLY verify the intended outcome? Select ONE best answer.

  1. The intended overlay packets appear within GRE encapsulation
  2. The advertised default withdraws when the required valid contribution disappears
  3. The invalid route remains excluded or a reviewed exception is clearly scoped
  4. Each customer's route is present in its intended table without unintended leakage

Explanation

Correct Answer

C:

The invalid route remains excluded or a reviewed exception is clearly scoped is the best operational verification evidence for this Junos service-provider case: An upstream test advertises a network that Junos classifies as martian. Technical basis: Martian routes classify prohibited or exceptional destination prefixes and can affect route acceptance or installation.

Incorrect Answers

A:

That option concerns GRE encapsulation purpose. Martian routes classify prohibited or exceptional destination prefixes and can affect route acceptance or installation.

B:

The advertised default withdraws when the required valid contribution disappears is relevant to the different engineering topic "Generated-route dependencies", but it is not the most directly supported operational verification evidence for this precise case: An upstream test advertises a network that Junos classifies as martian. the best answer here is: The invalid route remains excluded or a reviewed exception is clearly scoped.

D:

Each customer's route is present in its intended table without unintended leakage is relevant to the different engineering topic "Routing-instance isolation", but it is not the most directly supported operational verification evidence for this precise case: An upstream test advertises a network that Junos classifies as martian. the best answer here is: The invalid route remains excluded or a reviewed exception is clearly scoped.

Question 28

A provider network team identifies this situation: A valid internal laboratory prefix is unexpectedly suppressed by an address-classification rule. Which engineering decision BEST fits the stated requirement? Choose ONE best answer.

  1. Advertise intended connected prefixes without forming unwanted OSPF neighbors on customer-facing interfaces
  2. Examine route detail and policy reasons when a valid-looking Junos route is hidden or inactive
  3. Check martian address policy before assuming every prefix is eligible to enter the routing table
  4. Use generated routes when a synthesized route should depend on contributing route information under policy

Explanation

Correct Answer

C:

Check martian address policy before assuming every prefix is eligible to enter the routing table is the best technical design or decision for this Junos service-provider case: A valid internal laboratory prefix is unexpectedly suppressed by an address-classification rule. Technical basis: Martian routes classify prohibited or exceptional destination prefixes and can affect route acceptance or installation.

Incorrect Answers

A:

That option concerns OSPF passive-interface and export policy. Martian routes classify prohibited or exceptional destination prefixes and can affect route acceptance or installation.

B:

Examine route detail and policy reasons when a valid-looking Junos route is hidden or inactive is relevant to the different engineering topic "Active-route versus hidden-route triage", but it is not the most directly supported technical design or decision for this precise case: A valid internal laboratory prefix is unexpectedly suppressed by an address-classification rule. the best answer here is: Check martian address policy before assuming every prefix is eligible to enter the routing table.

D:

Use generated routes when a synthesized route should depend on contributing route information under policy is relevant to the different engineering topic "Generated-route dependencies", but it is not the most directly supported technical design or decision for this precise case: A valid internal laboratory prefix is unexpectedly suppressed by an address-classification rule. the best answer here is: Check martian address policy before assuming every prefix is eligible to enter the routing table.

Question 29

A provider network team identifies this situation: A valid internal laboratory prefix is unexpectedly suppressed by an address-classification rule. Which implementation or troubleshooting step is MOST APPROPRIATE here? Choose ONE best answer.

  1. Confirm the address context and any explicitly configured martian exceptions
  2. Evaluate supported explicit-null signaling and scheduling requirements
  3. Check active contributors and the aggregate route state, rather than forcing an unrelated static next hop
  4. Check interface routing-instance membership and installed forwarding context

Explanation

Correct Answer

A:

Confirm the address context and any explicitly configured martian exceptions is the best implementation and troubleshooting step for this Junos service-provider case: A valid internal laboratory prefix is unexpectedly suppressed by an address-classification rule. Technical basis: Martian routes classify prohibited or exceptional destination prefixes and can affect route acceptance or installation.

Incorrect Answers

B:

That option concerns Penultimate-hop popping. Martian routes classify prohibited or exceptional destination prefixes and can affect route acceptance or installation.

C:

That option concerns Aggregate-route contributor activation. Martian routes classify prohibited or exceptional destination prefixes and can affect route acceptance or installation.

D:

Check interface routing-instance membership and installed forwarding context is relevant to the different engineering topic "Routing-instance isolation", but it is not the most directly supported implementation and troubleshooting step for this precise case: A valid internal laboratory prefix is unexpectedly suppressed by an address-classification rule. the best answer here is: Confirm the address context and any explicitly configured martian exceptions.

Question 30

A provider network team identifies this situation: A valid internal laboratory prefix is unexpectedly suppressed by an address-classification rule. What verification evidence MOST CLEARLY demonstrates the solution is working? Choose ONE best answer.

  1. The IRB responds for its gateway address on the intended VLAN
  2. Only the intended prefix treatment changes while reserved ranges remain protected
  3. The route is either correctly rejected or reaccepted by a focused configuration fix
  4. Forwarding changes according to configured path preference rather than random distribution

Explanation

Correct Answer

B:

Only the intended prefix treatment changes while reserved ranges remain protected is the best operational verification evidence for this Junos service-provider case: A valid internal laboratory prefix is unexpectedly suppressed by an address-classification rule. Technical basis: Martian routes classify prohibited or exceptional destination prefixes and can affect route acceptance or installation.

Incorrect Answers

A:

That option concerns Integrated routing and bridging. Martian routes classify prohibited or exceptional destination prefixes and can affect route acceptance or installation.

C:

The route is either correctly rejected or reaccepted by a focused configuration fix is relevant to the different engineering topic "Active-route versus hidden-route triage", but it is not the most directly supported operational verification evidence for this precise case: A valid internal laboratory prefix is unexpectedly suppressed by an address-classification rule. the best answer here is: Only the intended prefix treatment changes while reserved ranges remain protected.

D:

Forwarding changes according to configured path preference rather than random distribution is relevant to the different engineering topic "Qualified-next-hop selection", but it is not the most directly supported operational verification evidence for this precise case: A valid internal laboratory prefix is unexpectedly suppressed by an address-classification rule. the best answer here is: Only the intended prefix treatment changes while reserved ranges remain protected.

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