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Juniper JN0-364 Practice Test 22

Question 210

A provider network team identifies this situation: A failover exit continues carrying traffic despite restoring the primary transit. What verification evidence MOST CLEARLY demonstrates the solution is working? Choose ONE best answer.

  1. The active table contains a resolvable path for authorized prefixes
  2. Each VLAN group follows its intended MSTI tree
  3. The diagnostic report avoids unsupported cross-AS MED assumptions
  4. Selected best paths reflect intended internal exit policy

Explanation

Correct Answer

D:

Selected best paths reflect intended internal exit policy is the best operational verification evidence for this Junos service-provider case: A failover exit continues carrying traffic despite restoring the primary transit. Technical basis: BGP LOCAL_PREF is exchanged internally and higher local preference is normally preferred before AS-path length.

Incorrect Answers

A:

The active table contains a resolvable path for authorized prefixes is relevant to the different engineering topic "BGP next-hop reachability", but it is not the most directly supported operational verification evidence for this precise case: A failover exit continues carrying traffic despite restoring the primary transit. the best answer here is: Selected best paths reflect intended internal exit policy.

B:

That option concerns MSTP region consistency. BGP LOCAL_PREF is exchanged internally and higher local preference is normally preferred before AS-path length.

C:

That option concerns BGP MED and peer comparison. BGP LOCAL_PREF is exchanged internally and higher local preference is normally preferred before AS-path length.

Question 211

A Junos service-provider engineer is reviewing this operational case: A downstream network receives a prefix advertisement containing its own ASN. Which technical approach MOST DIRECTLY addresses the issue? Select ONE best answer.

  1. Use local preference to express preferred outbound exit within an AS
  2. Enable permitted 802.1Q VLAN tags on a trunk only for intended tenant broadcast domains
  3. Use BGP groups to share policy and common parameters while retaining correct peer-specific settings
  4. Interpret AS_PATH as an inter-AS path and loop-prevention signal

Explanation

Correct Answer

D:

Interpret AS_PATH as an inter-AS path and loop-prevention signal is the best technical design or decision for this Junos service-provider case: A downstream network receives a prefix advertisement containing its own ASN. Technical basis: A router rejects routes containing its own AS in AS_PATH under ordinary BGP loop-prevention behavior.

Incorrect Answers

A:

Use local preference to express preferred outbound exit within an AS is relevant to the different engineering topic "BGP local preference selection", but it is not the most directly supported technical design or decision for this precise case: A downstream network receives a prefix advertisement containing its own ASN. the best answer here is: Interpret AS_PATH as an inter-AS path and loop-prevention signal.

B:

That option concerns Trunk tagging and VLAN allowlist. A router rejects routes containing its own AS in AS_PATH under ordinary BGP loop-prevention behavior.

C:

That option concerns BGP peer-group policy inheritance. A router rejects routes containing its own AS in AS_PATH under ordinary BGP loop-prevention behavior.

Question 212

A Junos service-provider engineer is reviewing this operational case: A downstream network receives a prefix advertisement containing its own ASN. What specific configuration or diagnostic action BEST implements the intended response? Select ONE best answer.

  1. Check show ospf database then show route protocol ospf
  2. Inspect path attributes and identify the AS loop before accepting updates
  3. Configure the BGP neighbor with the correct peer AS and reachable endpoint
  4. Apply explicit BGP export policy matching authorized active routes

Explanation

Correct Answer

B:

Inspect path attributes and identify the AS loop before accepting updates is the best implementation and troubleshooting step for this Junos service-provider case: A downstream network receives a prefix advertisement containing its own ASN. Technical basis: A router rejects routes containing its own AS in AS_PATH under ordinary BGP loop-prevention behavior.

Incorrect Answers

A:

That option concerns OSPF operational troubleshooting. A router rejects routes containing its own AS in AS_PATH under ordinary BGP loop-prevention behavior.

C:

That option concerns BGP TCP session and AS negotiation. A router rejects routes containing its own AS in AS_PATH under ordinary BGP loop-prevention behavior.

D:

Apply explicit BGP export policy matching authorized active routes is relevant to the different engineering topic "BGP outbound advertisement policy", but it is not the most directly supported implementation and troubleshooting step for this precise case: A downstream network receives a prefix advertisement containing its own ASN. the best answer here is: Inspect path attributes and identify the AS loop before accepting updates.

Question 213

A Junos service-provider engineer is reviewing this operational case: A downstream network receives a prefix advertisement containing its own ASN. Which observation would MOST RELIABLY verify the intended outcome? Select ONE best answer.

  1. The preferred route follows actual ordered policy rules
  2. The looping path is rejected while valid alternatives remain eligible
  3. Only approved customer networks enter BGP candidate routing
  4. Relevant protocol state persists across a controlled failover

Explanation

Correct Answer

B:

The looping path is rejected while valid alternatives remain eligible is the best operational verification evidence for this Junos service-provider case: A downstream network receives a prefix advertisement containing its own ASN. Technical basis: A router rejects routes containing its own AS in AS_PATH under ordinary BGP loop-prevention behavior.

Incorrect Answers

A:

The preferred route follows actual ordered policy rules is relevant to the different engineering topic "BGP best-path selection order", but it is not the most directly supported operational verification evidence for this precise case: A downstream network receives a prefix advertisement containing its own ASN. the best answer here is: The looping path is rejected while valid alternatives remain eligible.

C:

Only approved customer networks enter BGP candidate routing is relevant to the different engineering topic "BGP inbound routing policy", but it is not the most directly supported operational verification evidence for this precise case: A downstream network receives a prefix advertisement containing its own ASN. the best answer here is: The looping path is rejected while valid alternatives remain eligible.

D:

That option concerns Nonstop active routing NSR. A router rejects routes containing its own AS in AS_PATH under ordinary BGP loop-prevention behavior.

Question 214

A provider network team identifies this situation: A transit operator needs to understand why one advertised prefix is not selected. Which engineering decision BEST fits the stated requirement? Choose ONE best answer.

  1. Check correct edge designation and port roles before overriding an STP blocking decision
  2. Control BGP route advertisements with explicit export policy and eligibility checks
  3. Apply BGP's ordered path-selection criteria rather than selecting routes by one attribute in isolation
  4. Interpret AS_PATH as an inter-AS path and loop-prevention signal

Explanation

Correct Answer

D:

Interpret AS_PATH as an inter-AS path and loop-prevention signal is the best technical design or decision for this Junos service-provider case: A transit operator needs to understand why one advertised prefix is not selected. Technical basis: A router rejects routes containing its own AS in AS_PATH under ordinary BGP loop-prevention behavior.

Incorrect Answers

A:

That option concerns Spanning-tree troubleshooting and edge settings. A router rejects routes containing its own AS in AS_PATH under ordinary BGP loop-prevention behavior.

B:

Control BGP route advertisements with explicit export policy and eligibility checks is relevant to the different engineering topic "BGP outbound advertisement policy", but it is not the most directly supported technical design or decision for this precise case: A transit operator needs to understand why one advertised prefix is not selected. the best answer here is: Interpret AS_PATH as an inter-AS path and loop-prevention signal.

C:

Apply BGP's ordered path-selection criteria rather than selecting routes by one attribute in isolation is relevant to the different engineering topic "BGP best-path selection order", but it is not the most directly supported technical design or decision for this precise case: A transit operator needs to understand why one advertised prefix is not selected. the best answer here is: Interpret AS_PATH as an inter-AS path and loop-prevention signal.

Question 215

A provider network team identifies this situation: A transit operator needs to understand why one advertised prefix is not selected. Which implementation or troubleshooting step is MOST APPROPRIATE here? Choose ONE best answer.

  1. Review higher-priority path attributes before any late tie-breakers
  2. Inspect contributing route selection and applied generation policy
  3. Inspect local preference and candidate route attributes in the local AS
  4. Compare AS_PATH sequence and local preferences of candidate routes

Explanation

Correct Answer

D:

Compare AS_PATH sequence and local preferences of candidate routes is the best implementation and troubleshooting step for this Junos service-provider case: A transit operator needs to understand why one advertised prefix is not selected. Technical basis: A router rejects routes containing its own AS in AS_PATH under ordinary BGP loop-prevention behavior.

Incorrect Answers

A:

Review higher-priority path attributes before any late tie-breakers is relevant to the different engineering topic "BGP best-path selection order", but it is not the most directly supported implementation and troubleshooting step for this precise case: A transit operator needs to understand why one advertised prefix is not selected. the best answer here is: Compare AS_PATH sequence and local preferences of candidate routes.

B:

That option concerns Generated-route dependencies. A router rejects routes containing its own AS in AS_PATH under ordinary BGP loop-prevention behavior.

C:

Inspect local preference and candidate route attributes in the local AS is relevant to the different engineering topic "BGP local preference selection", but it is not the most directly supported implementation and troubleshooting step for this precise case: A transit operator needs to understand why one advertised prefix is not selected. the best answer here is: Compare AS_PATH sequence and local preferences of candidate routes.

Question 216

A provider network team identifies this situation: A transit operator needs to understand why one advertised prefix is not selected. What verification evidence MOST CLEARLY demonstrates the solution is working? Choose ONE best answer.

  1. Outbound advertisement matches the intended prefix policy
  2. The approved /24 is accepted without opening broad unintended acceptance
  3. The path selection matches the documented ordered criteria
  4. The IRB responds for its gateway address on the intended VLAN

Explanation

Correct Answer

C:

The path selection matches the documented ordered criteria is the best operational verification evidence for this Junos service-provider case: A transit operator needs to understand why one advertised prefix is not selected. Technical basis: A router rejects routes containing its own AS in AS_PATH under ordinary BGP loop-prevention behavior.

Incorrect Answers

A:

Outbound advertisement matches the intended prefix policy is relevant to the different engineering topic "BGP route-troubleshooting CLI", but it is not the most directly supported operational verification evidence for this precise case: A transit operator needs to understand why one advertised prefix is not selected. the best answer here is: The path selection matches the documented ordered criteria.

B:

The approved /24 is accepted without opening broad unintended acceptance is relevant to the different engineering topic "BGP inbound routing policy", but it is not the most directly supported operational verification evidence for this precise case: A transit operator needs to understand why one advertised prefix is not selected. the best answer here is: The path selection matches the documented ordered criteria.

D:

That option concerns Integrated routing and bridging. A router rejects routes containing its own AS in AS_PATH under ordinary BGP loop-prevention behavior.

Question 217

A Junos service-provider engineer is reviewing this operational case: A customer advertises the same prefix on two links to the same provider. Which technical approach MOST DIRECTLY addresses the issue? Select ONE best answer.

  1. Use MED only where applicable to compare ingress suggestions from neighboring AS paths
  2. Use show bgp neighbor and show route protocol/receive/advertising views to separate session, policy and RIB problems
  3. Use MPLS and RSVP configuration together to create a supported signaled label-switched path
  4. Interpret OPEN, UPDATE, KEEPALIVE and NOTIFICATION roles during session setup and operation

Explanation

Correct Answer

A:

Use MED only where applicable to compare ingress suggestions from neighboring AS paths is the best technical design or decision for this Junos service-provider case: A customer advertises the same prefix on two links to the same provider. Technical basis: A lower MED can influence inbound selection under applicable comparison rules, but it is not universally compared across unrelated AS paths.

Incorrect Answers

B:

That option concerns BGP route-troubleshooting CLI. A lower MED can influence inbound selection under applicable comparison rules, but it is not universally compared across unrelated AS paths.

C:

That option concerns RSVP LSP signaling. A lower MED can influence inbound selection under applicable comparison rules, but it is not universally compared across unrelated AS paths.

D:

That option concerns BGP message processing. A lower MED can influence inbound selection under applicable comparison rules, but it is not universally compared across unrelated AS paths.

Question 218

A Junos service-provider engineer is reviewing this operational case: A customer advertises the same prefix on two links to the same provider. What specific configuration or diagnostic action BEST implements the intended response? Select ONE best answer.

  1. Use a targeted import policy to reject the unauthorized prefix
  2. Inspect current route candidates and identify the first decisive comparison
  3. Compare supported hello and dead intervals and interface state
  4. Review acceptable MED policy and path comparison behavior

Explanation

Correct Answer

D:

Review acceptable MED policy and path comparison behavior is the best implementation and troubleshooting step for this Junos service-provider case: A customer advertises the same prefix on two links to the same provider. Technical basis: A lower MED can influence inbound selection under applicable comparison rules, but it is not universally compared across unrelated AS paths.

Incorrect Answers

A:

Use a targeted import policy to reject the unauthorized prefix is relevant to the different engineering topic "BGP inbound routing policy", but it is not the most directly supported implementation and troubleshooting step for this precise case: A customer advertises the same prefix on two links to the same provider. the best answer here is: Review acceptable MED policy and path comparison behavior.

B:

That option concerns BGP best-path selection order. A lower MED can influence inbound selection under applicable comparison rules, but it is not universally compared across unrelated AS paths.

C:

That option concerns OSPF hello/dead agreement. A lower MED can influence inbound selection under applicable comparison rules, but it is not universally compared across unrelated AS paths.

Question 219

A Junos service-provider engineer is reviewing this operational case: A customer advertises the same prefix on two links to the same provider. Which observation would MOST RELIABLY verify the intended outcome? Select ONE best answer.

  1. Ingress path selection reflects policy where MED is eligible for comparison
  2. The intended IPv6 route information is present and eligible for SPF
  3. Peers share the approved policy but retain valid independent sessions
  4. Only approved customer networks enter BGP candidate routing

Explanation

Correct Answer

A:

Ingress path selection reflects policy where MED is eligible for comparison is the best operational verification evidence for this Junos service-provider case: A customer advertises the same prefix on two links to the same provider. Technical basis: A lower MED can influence inbound selection under applicable comparison rules, but it is not universally compared across unrelated AS paths.

Incorrect Answers

B:

That option concerns IS-IS TLV reachability advertisements. A lower MED can influence inbound selection under applicable comparison rules, but it is not universally compared across unrelated AS paths.

C:

That option concerns BGP peer-group policy inheritance. A lower MED can influence inbound selection under applicable comparison rules, but it is not universally compared across unrelated AS paths.

D:

Only approved customer networks enter BGP candidate routing is relevant to the different engineering topic "BGP inbound routing policy", but it is not the most directly supported operational verification evidence for this precise case: A customer advertises the same prefix on two links to the same provider. the best answer here is: Ingress path selection reflects policy where MED is eligible for comparison.

Question 220

A provider network team identifies this situation: Two routes from different upstream ASes have different MED values. Which engineering decision BEST fits the stated requirement? Choose ONE best answer.

  1. Use MED only where applicable to compare ingress suggestions from neighboring AS paths
  2. Interpret the 2Way and Full states according to OSPF network type and DR roles
  3. Interpret AS_PATH as an inter-AS path and loop-prevention signal
  4. Control BGP route advertisements with explicit export policy and eligibility checks

Explanation

Correct Answer

A:

Use MED only where applicable to compare ingress suggestions from neighboring AS paths is the best technical design or decision for this Junos service-provider case: Two routes from different upstream ASes have different MED values. Technical basis: A lower MED can influence inbound selection under applicable comparison rules, but it is not universally compared across unrelated AS paths.

Incorrect Answers

B:

That option concerns OSPF two-way versus full neighbors. A lower MED can influence inbound selection under applicable comparison rules, but it is not universally compared across unrelated AS paths.

C:

That option concerns BGP AS-path loop prevention. A lower MED can influence inbound selection under applicable comparison rules, but it is not universally compared across unrelated AS paths.

D:

Control BGP route advertisements with explicit export policy and eligibility checks is relevant to the different engineering topic "BGP outbound advertisement policy", but it is not the most directly supported technical design or decision for this precise case: Two routes from different upstream ASes have different MED values. the best answer here is: Use MED only where applicable to compare ingress suggestions from neighboring AS paths.

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