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.
- Define contributing-route conditions and the intended generated route
- Confirm matching authentication parameters without exposing secret material
- Place relevant interfaces and route processing into separate configured instances
- 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.
- The cause is narrowed to advertisement, rejection or route selection
- The invalid route remains excluded or a reviewed exception is clearly scoped
- The advertised default withdraws when the required valid contribution disappears
- 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.
- Trace labeled forwarding across ingress, transit and egress before treating a customer VPN problem as BGP-only
- Use generated routes when a synthesized route should depend on contributing route information under policy
- Choose the correct Junos routing instance and interface membership to keep customer reachability independent
- 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.
- Check interface routing-instance membership and installed forwarding context
- Inspect contributing route selection and applied generation policy
- Inspect received superior BPDUs and verify the correct boundary role
- 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.
- The generated path reflects approved active contributor information
- Forwarding changes according to configured path preference rather than random distribution
- The route is either correctly rejected or reaccepted by a focused configuration fix
- 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.
- Use the IS-IS overload bit to discourage unwanted transit through a router during constrained operation
- Use a resolvable next hop for a Junos static route instead of assuming a configured route is automatically active
- Use filter-based forwarding on eligible incoming traffic to steer matching packets into the intended routing context
- 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.
- Build a precise match and a supported routing-instance action with a safe fall-through
- Set qualified-next-hop preference intentionally and verify both gateway reachabilities
- Inspect the martian list and route handling before considering a justified exception
- 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.
- The intended overlay packets appear within GRE encapsulation
- The advertised default withdraws when the required valid contribution disappears
- The invalid route remains excluded or a reviewed exception is clearly scoped
- 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.
- Advertise intended connected prefixes without forming unwanted OSPF neighbors on customer-facing interfaces
- Examine route detail and policy reasons when a valid-looking Junos route is hidden or inactive
- Check martian address policy before assuming every prefix is eligible to enter the routing table
- 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.
- Confirm the address context and any explicitly configured martian exceptions
- Evaluate supported explicit-null signaling and scheduling requirements
- Check active contributors and the aggregate route state, rather than forcing an unrelated static next hop
- 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.
- The IRB responds for its gateway address on the intended VLAN
- Only the intended prefix treatment changes while reserved ranges remain protected
- The route is either correctly rejected or reaccepted by a focused configuration fix
- 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.