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Juniper JN0-364 Practice Test 23

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.

Question 221

A provider network team identifies this situation: Two routes from different upstream ASes have different MED values. Which implementation or troubleshooting step is MOST APPROPRIATE here? Choose ONE best answer.

  1. Inspect policy and the route selection order before attributing the result to MED
  2. Compare inet6 route preference with actual forwarding next hops
  3. Validate next-hop reachability and TCP connectivity before modifying policy
  4. Inspect show route advertising-protocol bgp and export terms

Explanation

Correct Answer

A:

Inspect policy and the route selection order before attributing the result to MED is the best implementation and troubleshooting step 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 IPv6 RIB versus FIB verification. A lower MED can influence inbound selection under applicable comparison rules, but it is not universally compared across unrelated AS paths.

C:

Validate next-hop reachability and TCP connectivity before modifying policy is relevant to the different engineering topic "BGP TCP session and AS negotiation", but it is not the most directly supported implementation and troubleshooting step for this precise case: Two routes from different upstream ASes have different MED values. the best answer here is: Inspect policy and the route selection order before attributing the result to MED.

D:

Inspect show route advertising-protocol bgp and export terms 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: Two routes from different upstream ASes have different MED values. the best answer here is: Inspect policy and the route selection order before attributing the result to MED.

Question 222

A provider network team identifies this situation: Two routes from different upstream ASes have different MED values. What verification evidence MOST CLEARLY demonstrates the solution is working? Choose ONE best answer.

  1. The transport establishes and BGP progresses beyond Active
  2. The diagnostic report avoids unsupported cross-AS MED assumptions
  3. Endpoint traffic begins rapidly without weakening transit loop protection
  4. Route availability matches the intentional reflection or mesh architecture

Explanation

Correct Answer

B:

The diagnostic report avoids unsupported cross-AS MED assumptions is the best operational verification evidence 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

A:

The transport establishes and BGP progresses beyond Active is relevant to the different engineering topic "BGP TCP session and AS negotiation", but it is not the most directly supported operational verification evidence for this precise case: Two routes from different upstream ASes have different MED values. the best answer here is: The diagnostic report avoids unsupported cross-AS MED assumptions.

C:

That option concerns Spanning-tree troubleshooting and edge settings. 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 IBGP route propagation constraints. A lower MED can influence inbound selection under applicable comparison rules, but it is not universally compared across unrelated AS paths.

Question 223

A Junos service-provider engineer is reviewing this operational case: An iBGP peer receives an external route whose next-hop address is unreachable. Which technical approach MOST DIRECTLY addresses the issue? Select ONE best answer.

  1. Verify the BGP NEXT_HOP resolves in the correct table before expecting installation
  2. Filter and modify received BGP routes with explicit import policy terms
  3. Interpret IS-IS TLVs as typed data for advertised topology, protocol reachability and capabilities
  4. Use local preference to express preferred outbound exit within an AS

Explanation

Correct Answer

A:

Verify the BGP NEXT_HOP resolves in the correct table before expecting installation is the best technical design or decision for this Junos service-provider case: An iBGP peer receives an external route whose next-hop address is unreachable. Technical basis: BGP routes can be validly advertised yet hidden or inactive because the advertised next hop is unresolved.

Incorrect Answers

B:

That option concerns BGP inbound routing policy. BGP routes can be validly advertised yet hidden or inactive because the advertised next hop is unresolved.

C:

That option concerns IS-IS TLV reachability advertisements. BGP routes can be validly advertised yet hidden or inactive because the advertised next hop is unresolved.

D:

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: An iBGP peer receives an external route whose next-hop address is unreachable. the best answer here is: Verify the BGP NEXT_HOP resolves in the correct table before expecting installation.

Question 224

A Junos service-provider engineer is reviewing this operational case: An iBGP peer receives an external route whose next-hop address is unreachable. What specific configuration or diagnostic action BEST implements the intended response? Select ONE best answer.

  1. Inspect path attributes and identify the AS loop before accepting updates
  2. Inspect import/export policy and UPDATE advertisements
  3. Review hello counters, interface levels, NET area and authentication
  4. Inspect route detail and ensure the authorized next-hop route exists

Explanation

Correct Answer

D:

Inspect route detail and ensure the authorized next-hop route exists is the best implementation and troubleshooting step for this Junos service-provider case: An iBGP peer receives an external route whose next-hop address is unreachable. Technical basis: BGP routes can be validly advertised yet hidden or inactive because the advertised next hop is unresolved.

Incorrect Answers

A:

That option concerns BGP AS-path loop prevention. BGP routes can be validly advertised yet hidden or inactive because the advertised next hop is unresolved.

B:

Inspect import/export policy and UPDATE advertisements is relevant to the different engineering topic "BGP message processing", but it is not the most directly supported implementation and troubleshooting step for this precise case: An iBGP peer receives an external route whose next-hop address is unreachable. the best answer here is: Inspect route detail and ensure the authorized next-hop route exists.

C:

That option concerns IS-IS hello adjacency negotiation. BGP routes can be validly advertised yet hidden or inactive because the advertised next hop is unresolved.

Question 225

A Junos service-provider engineer is reviewing this operational case: An iBGP peer receives an external route whose next-hop address is unreachable. Which observation would MOST RELIABLY verify the intended outcome? Select ONE best answer.

  1. Internal BGP selection prefers the configured primary when paths are otherwise valid
  2. The BGP prefix becomes eligible only when the next hop resolves
  3. Their Level-2 adjacency comes Up and the required prefixes become reachable
  4. The session is Established and intended NLRI appears in UPDATEs

Explanation

Correct Answer

B:

The BGP prefix becomes eligible only when the next hop resolves is the best operational verification evidence for this Junos service-provider case: An iBGP peer receives an external route whose next-hop address is unreachable. Technical basis: BGP routes can be validly advertised yet hidden or inactive because the advertised next hop is unresolved.

Incorrect Answers

A:

Internal BGP selection prefers the configured primary when paths are otherwise valid is relevant to the different engineering topic "BGP local preference selection", but it is not the most directly supported operational verification evidence for this precise case: An iBGP peer receives an external route whose next-hop address is unreachable. the best answer here is: The BGP prefix becomes eligible only when the next hop resolves.

C:

That option concerns IS-IS Level-1/Level-2 reachability. BGP routes can be validly advertised yet hidden or inactive because the advertised next hop is unresolved.

D:

The session is Established and intended NLRI appears in UPDATEs is relevant to the different engineering topic "BGP message processing", but it is not the most directly supported operational verification evidence for this precise case: An iBGP peer receives an external route whose next-hop address is unreachable. the best answer here is: The BGP prefix becomes eligible only when the next hop resolves.

Question 226

A provider network team identifies this situation: A provider edge changes the eBGP handoff addressing and learned prefixes disappear. Which engineering decision BEST fits the stated requirement? Choose ONE best answer.

  1. Check BPDU exchange and control-plane filtering when spanning-tree connectivity is unstable
  2. Verify the BGP NEXT_HOP resolves in the correct table before expecting installation
  3. Interpret OPEN, UPDATE, KEEPALIVE and NOTIFICATION roles during session setup and operation
  4. Use MED only where applicable to compare ingress suggestions from neighboring AS paths

Explanation

Correct Answer

B:

Verify the BGP NEXT_HOP resolves in the correct table before expecting installation is the best technical design or decision for this Junos service-provider case: A provider edge changes the eBGP handoff addressing and learned prefixes disappear. Technical basis: BGP routes can be validly advertised yet hidden or inactive because the advertised next hop is unresolved.

Incorrect Answers

A:

That option concerns BPDU visibility on trunks. BGP routes can be validly advertised yet hidden or inactive because the advertised next hop is unresolved.

C:

Interpret OPEN, UPDATE, KEEPALIVE and NOTIFICATION roles during session setup and operation is relevant to the different engineering topic "BGP message processing", but it is not the most directly supported technical design or decision for this precise case: A provider edge changes the eBGP handoff addressing and learned prefixes disappear. the best answer here is: Verify the BGP NEXT_HOP resolves in the correct table before expecting installation.

D:

That option concerns BGP MED and peer comparison. BGP routes can be validly advertised yet hidden or inactive because the advertised next hop is unresolved.

Question 227

A provider network team identifies this situation: A provider edge changes the eBGP handoff addressing and learned prefixes disappear. Which implementation or troubleshooting step is MOST APPROPRIATE here? Choose ONE best answer.

  1. Inspect inherited group settings and peer overrides
  2. Inspect advertised and received label mappings for the target FEC
  3. Check next-hop attributes and IGP reachability
  4. Inspect local preference and candidate route attributes in the local AS

Explanation

Correct Answer

C:

Check next-hop attributes and IGP reachability is the best implementation and troubleshooting step for this Junos service-provider case: A provider edge changes the eBGP handoff addressing and learned prefixes disappear. Technical basis: BGP routes can be validly advertised yet hidden or inactive because the advertised next hop is unresolved.

Incorrect Answers

A:

That option concerns BGP peer-group policy inheritance. BGP routes can be validly advertised yet hidden or inactive because the advertised next hop is unresolved.

B:

That option concerns MPLS label binding and retention. BGP routes can be validly advertised yet hidden or inactive because the advertised next hop is unresolved.

D:

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 provider edge changes the eBGP handoff addressing and learned prefixes disappear. the best answer here is: Check next-hop attributes and IGP reachability.

Question 228

A provider network team identifies this situation: A provider edge changes the eBGP handoff addressing and learned prefixes disappear. What verification evidence MOST CLEARLY demonstrates the solution is working? Choose ONE best answer.

  1. The transport establishes and BGP progresses beyond Active
  2. The IRB responds for its gateway address on the intended VLAN
  3. The active table contains a resolvable path for authorized prefixes
  4. Route availability matches the intentional reflection or mesh architecture

Explanation

Correct Answer

C:

The active table contains a resolvable path for authorized prefixes is the best operational verification evidence for this Junos service-provider case: A provider edge changes the eBGP handoff addressing and learned prefixes disappear. Technical basis: BGP routes can be validly advertised yet hidden or inactive because the advertised next hop is unresolved.

Incorrect Answers

A:

That option concerns BGP TCP session and AS negotiation. BGP routes can be validly advertised yet hidden or inactive because the advertised next hop is unresolved.

B:

That option concerns Integrated routing and bridging. BGP routes can be validly advertised yet hidden or inactive because the advertised next hop is unresolved.

D:

That option concerns IBGP route propagation constraints. BGP routes can be validly advertised yet hidden or inactive because the advertised next hop is unresolved.

Question 229

A Junos service-provider engineer is reviewing this operational case: Two peers advertise one customer prefix with different local preference and AS path lengths. Which technical approach MOST DIRECTLY addresses the issue? Select ONE best answer.

  1. Control BGP route advertisements with explicit export policy and eligibility checks
  2. Apply BGP's ordered path-selection criteria rather than selecting routes by one attribute in isolation
  3. Configure an eBGP or iBGP peer with the correct peer AS and reachable TCP endpoint
  4. Verify LSP origination and flooding before assuming an IS-IS prefix is eligible for SPF

Explanation

Correct Answer

B:

Apply BGP's ordered path-selection criteria rather than selecting routes by one attribute in isolation is the best technical design or decision for this Junos service-provider case: Two peers advertise one customer prefix with different local preference and AS path lengths. Technical basis: BGP compares route preference, policy attributes and other path criteria in a defined sequence.

Incorrect Answers

A:

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 peers advertise one customer prefix with different local preference and AS path lengths. the best answer here is: Apply BGP's ordered path-selection criteria rather than selecting routes by one attribute in isolation.

C:

Configure an eBGP or iBGP peer with the correct peer AS and reachable TCP endpoint is relevant to the different engineering topic "BGP TCP session and AS negotiation", but it is not the most directly supported technical design or decision for this precise case: Two peers advertise one customer prefix with different local preference and AS path lengths. the best answer here is: Apply BGP's ordered path-selection criteria rather than selecting routes by one attribute in isolation.

D:

That option concerns IS-IS link-state database. BGP compares route preference, policy attributes and other path criteria in a defined sequence.

Question 230

A Junos service-provider engineer is reviewing this operational case: Two peers advertise one customer prefix with different local preference and AS path lengths. What specific configuration or diagnostic action BEST implements the intended response? Select ONE best answer.

  1. Inspect roles and path costs across both uplinks
  2. Inspect path attributes and identify the AS loop before accepting updates
  3. Apply explicit BGP export policy matching authorized active routes
  4. Inspect current route candidates and identify the first decisive comparison

Explanation

Correct Answer

D:

Inspect current route candidates and identify the first decisive comparison is the best implementation and troubleshooting step for this Junos service-provider case: Two peers advertise one customer prefix with different local preference and AS path lengths. Technical basis: BGP compares route preference, policy attributes and other path criteria in a defined sequence.

Incorrect Answers

A:

That option concerns STP root and designated port roles. BGP compares route preference, policy attributes and other path criteria in a defined sequence.

B:

Inspect path attributes and identify the AS loop before accepting updates is relevant to the different engineering topic "BGP AS-path loop prevention", but it is not the most directly supported implementation and troubleshooting step for this precise case: Two peers advertise one customer prefix with different local preference and AS path lengths. the best answer here is: Inspect current route candidates and identify the first decisive comparison.

C:

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: Two peers advertise one customer prefix with different local preference and AS path lengths. the best answer here is: Inspect current route candidates and identify the first decisive comparison.

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