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Exam Code: JN0-650

Exam Name: Enterprise Routing and Switching, Professional (JNCIP-ENT)

Certification Provider: Juniper

Corresponding Certification: JNCIP-ENT

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Juniper JN0-650 Practice Test 17

Question 160

An enterprise network designer recommends: Use the BGP origin-attribute comparison in the supported path selection sequence. Which situation most clearly calls for this action?

  1. A high-local-preference route is received but its next hop cannot be resolved to an outbound interface.
  2. A router receives three BGP paths but only one is active and operators need to understand the decision.
  3. Two BGP routes have equal local preference but different numbers of AS entries in their AS paths.
  4. BGP alternatives have equal higher-priority attributes but one has IGP origin and the other has incomplete origin.

Explanation

Correct Answer

D:

This case requires the Origin type tie break action. A route with IGP origin can be preferred over an incomplete-origin path in this tie.

Incorrect Answers

A:

This other case would be better matched to Restore IP routing reachability to the route's recursive BGP next hop. The path can participate in valid best-path selection after next-hop resolution.

B:

This other case would be better matched to Inspect detailed BGP routes, attributes, next hops, and the active-path indication. The ranking evidence can identify the selection criterion behind the chosen path.

C:

This other case would be better matched to Prefer the route with the shorter AS-path length under the normal selection sequence. The fewer-AS route can win when earlier selection criteria are equal.

Question 161

Two paths tie on earlier policy and path criteria, but one is learned from EBGP and one from IBGP. Which Junos networking action or protocol decision best addresses this requirement?

  1. Use policy to assign a higher BGP local-preference value to the route via exit A.
  2. Compare Junos route preference values across protocols before changing BGP policy.
  3. Apply the normal BGP preference for an EBGP path over an otherwise comparable IBGP path.
  4. Evaluate the lower MED where the BGP comparison rules permit MED comparison.

Explanation

Correct Answer

C:

This action addresses EBGP over IBGP selection. The externally learned path can become preferred after higher priority criteria tie.

Incorrect Answers

A:

That action targets Higher local preference: Local-preference ranking can steer outbound traffic toward the preferred egress. It does not directly resolve the stated EBGP over IBGP selection requirement.

B:

That action targets BGP route preference: The operator can identify why a non-BGP route wins active-route selection. It does not directly resolve the stated EBGP over IBGP selection requirement.

D:

That action targets MED comparison: The MED attribute can influence choice among comparable ingress options from that AS. It does not directly resolve the stated EBGP over IBGP selection requirement.

Question 162

A Junos network engineer takes this step: Apply the normal BGP preference for an EBGP path over an otherwise comparable IBGP path. Which outcome most directly follows?

  1. Local-preference ranking can steer outbound traffic toward the preferred egress.
  2. The MED attribute can influence choice among comparable ingress options from that AS.
  3. The operator can identify why a non-BGP route wins active-route selection.
  4. The externally learned path can become preferred after higher priority criteria tie.

Explanation

Correct Answer

D:

This is the direct result of the EBGP over IBGP selection decision: The externally learned path can become preferred after higher priority criteria tie.

Incorrect Answers

A:

This outcome is associated with Higher local preference (Use policy to assign a higher BGP local-preference value to the route via exit A.), not the specified action.

B:

This outcome is associated with MED comparison (Evaluate the lower MED where the BGP comparison rules permit MED comparison.), not the specified action.

C:

This outcome is associated with BGP route preference (Compare Junos route preference values across protocols before changing BGP policy.), not the specified action.

Question 163

Two paths tie on earlier policy and path criteria, but one is learned from EBGP and one from IBGP. A colleague instead suggests: Compare Junos route preference values across protocols before changing BGP policy. Which corrective approach most directly addresses the original issue?

  1. Apply the normal BGP preference for an EBGP path over an otherwise comparable IBGP path.
  2. Compare Junos route preference values across protocols before changing BGP policy.
  3. Evaluate the lower MED where the BGP comparison rules permit MED comparison.
  4. Use policy to assign a higher BGP local-preference value to the route via exit A.

Explanation

Correct Answer

A:

This corrective choice addresses EBGP over IBGP selection. The externally learned path can become preferred after higher priority criteria tie.

Incorrect Answers

B:

That alternative applies to BGP route preference instead. The operator can identify why a non-BGP route wins active-route selection.

C:

That alternative applies to MED comparison instead. The MED attribute can influence choice among comparable ingress options from that AS.

D:

That alternative applies to Higher local preference instead. Local-preference ranking can steer outbound traffic toward the preferred egress.

Question 164

An enterprise network designer recommends: Apply the normal BGP preference for an EBGP path over an otherwise comparable IBGP path. Which situation most clearly calls for this action?

  1. A prefix is received by BGP, yet a static route is selected as the active route in the Junos RIB.
  2. Two paths tie on earlier policy and path criteria, but one is learned from EBGP and one from IBGP.
  3. Two otherwise comparable iBGP routes reach one destination, but the operator wants all AS-internal routers to prefer exit A.
  4. A neighboring AS advertises comparable paths with different multi-exit discriminator values.

Explanation

Correct Answer

B:

This case requires the EBGP over IBGP selection action. The externally learned path can become preferred after higher priority criteria tie.

Incorrect Answers

A:

This other case would be better matched to Compare Junos route preference values across protocols before changing BGP policy. The operator can identify why a non-BGP route wins active-route selection.

C:

This other case would be better matched to Use policy to assign a higher BGP local-preference value to the route via exit A. Local-preference ranking can steer outbound traffic toward the preferred egress.

D:

This other case would be better matched to Evaluate the lower MED where the BGP comparison rules permit MED comparison. The MED attribute can influence choice among comparable ingress options from that AS.

Question 165

A high-local-preference route is received but its next hop cannot be resolved to an outbound interface. Which Junos networking action or protocol decision best addresses this requirement?

  1. Restore IP routing reachability to the route's recursive BGP next hop.
  2. Inspect detailed BGP routes, attributes, next hops, and the active-path indication.
  3. Prefer the route with the shorter AS-path length under the normal selection sequence.
  4. Use the BGP origin-attribute comparison in the supported path selection sequence.

Explanation

Correct Answer

A:

This action addresses BGP next-hop validity. The path can participate in valid best-path selection after next-hop resolution.

Incorrect Answers

B:

That action targets BGP selection evidence: The ranking evidence can identify the selection criterion behind the chosen path. It does not directly resolve the stated BGP next-hop validity requirement.

C:

That action targets Shorter AS path: The fewer-AS route can win when earlier selection criteria are equal. It does not directly resolve the stated BGP next-hop validity requirement.

D:

That action targets Origin type tie break: A route with IGP origin can be preferred over an incomplete-origin path in this tie. It does not directly resolve the stated BGP next-hop validity requirement.

Question 166

A Junos network engineer takes this step: Restore IP routing reachability to the route's recursive BGP next hop. Which outcome most directly follows?

  1. The fewer-AS route can win when earlier selection criteria are equal.
  2. The path can participate in valid best-path selection after next-hop resolution.
  3. The ranking evidence can identify the selection criterion behind the chosen path.
  4. A route with IGP origin can be preferred over an incomplete-origin path in this tie.

Explanation

Correct Answer

B:

This is the direct result of the BGP next-hop validity decision: The path can participate in valid best-path selection after next-hop resolution.

Incorrect Answers

A:

This outcome is associated with Shorter AS path (Prefer the route with the shorter AS-path length under the normal selection sequence.), not the specified action.

C:

This outcome is associated with BGP selection evidence (Inspect detailed BGP routes, attributes, next hops, and the active-path indication.), not the specified action.

D:

This outcome is associated with Origin type tie break (Use the BGP origin-attribute comparison in the supported path selection sequence.), not the specified action.

Question 167

A high-local-preference route is received but its next hop cannot be resolved to an outbound interface. A colleague instead suggests: Inspect detailed BGP routes, attributes, next hops, and the active-path indication. Which corrective approach most directly addresses the original issue?

  1. Use the BGP origin-attribute comparison in the supported path selection sequence.
  2. Prefer the route with the shorter AS-path length under the normal selection sequence.
  3. Restore IP routing reachability to the route's recursive BGP next hop.
  4. Inspect detailed BGP routes, attributes, next hops, and the active-path indication.

Explanation

Correct Answer

C:

This corrective choice addresses BGP next-hop validity. The path can participate in valid best-path selection after next-hop resolution.

Incorrect Answers

A:

That alternative applies to Origin type tie break instead. A route with IGP origin can be preferred over an incomplete-origin path in this tie.

B:

That alternative applies to Shorter AS path instead. The fewer-AS route can win when earlier selection criteria are equal.

D:

That alternative applies to BGP selection evidence instead. The ranking evidence can identify the selection criterion behind the chosen path.

Question 168

An enterprise network designer recommends: Restore IP routing reachability to the route's recursive BGP next hop. Which situation most clearly calls for this action?

  1. Two BGP routes have equal local preference but different numbers of AS entries in their AS paths.
  2. BGP alternatives have equal higher-priority attributes but one has IGP origin and the other has incomplete origin.
  3. A router receives three BGP paths but only one is active and operators need to understand the decision.
  4. A high-local-preference route is received but its next hop cannot be resolved to an outbound interface.

Explanation

Correct Answer

D:

This case requires the BGP next-hop validity action. The path can participate in valid best-path selection after next-hop resolution.

Incorrect Answers

A:

This other case would be better matched to Prefer the route with the shorter AS-path length under the normal selection sequence. The fewer-AS route can win when earlier selection criteria are equal.

B:

This other case would be better matched to Use the BGP origin-attribute comparison in the supported path selection sequence. A route with IGP origin can be preferred over an incomplete-origin path in this tie.

C:

This other case would be better matched to Inspect detailed BGP routes, attributes, next hops, and the active-path indication. The ranking evidence can identify the selection criterion behind the chosen path.

Question 169

A prefix is received by BGP, yet a static route is selected as the active route in the Junos RIB. Which Junos networking action or protocol decision best addresses this requirement?

  1. Compare Junos route preference values across protocols before changing BGP policy.
  2. Apply the normal BGP preference for an EBGP path over an otherwise comparable IBGP path.
  3. Evaluate the lower MED where the BGP comparison rules permit MED comparison.
  4. Use policy to assign a higher BGP local-preference value to the route via exit A.

Explanation

Correct Answer

A:

This action addresses BGP route preference. The operator can identify why a non-BGP route wins active-route selection.

Incorrect Answers

B:

That action targets EBGP over IBGP selection: The externally learned path can become preferred after higher priority criteria tie. It does not directly resolve the stated BGP route preference requirement.

C:

That action targets MED comparison: The MED attribute can influence choice among comparable ingress options from that AS. It does not directly resolve the stated BGP route preference requirement.

D:

That action targets Higher local preference: Local-preference ranking can steer outbound traffic toward the preferred egress. It does not directly resolve the stated BGP route preference requirement.

Question 170

A Junos network engineer takes this step: Compare Junos route preference values across protocols before changing BGP policy. Which outcome most directly follows?

  1. Local-preference ranking can steer outbound traffic toward the preferred egress.
  2. The operator can identify why a non-BGP route wins active-route selection.
  3. The externally learned path can become preferred after higher priority criteria tie.
  4. The MED attribute can influence choice among comparable ingress options from that AS.

Explanation

Correct Answer

B:

This is the direct result of the BGP route preference decision: The operator can identify why a non-BGP route wins active-route selection.

Incorrect Answers

A:

This outcome is associated with Higher local preference (Use policy to assign a higher BGP local-preference value to the route via exit A.), not the specified action.

C:

This outcome is associated with EBGP over IBGP selection (Apply the normal BGP preference for an EBGP path over an otherwise comparable IBGP path.), not the specified action.

D:

This outcome is associated with MED comparison (Evaluate the lower MED where the BGP comparison rules permit MED comparison.), not the specified action.

Enterprise Routing and Switching, Professional (JNCIP-ENT) (JN0-650) Practice Tests