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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 18

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.

Question 171

A prefix is received by BGP, yet a static route is selected as the active route in the Junos RIB. A colleague instead suggests: Use policy to assign a higher BGP local-preference value to the route via exit A. Which corrective approach most directly addresses the original issue?

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

Explanation

Correct Answer

C:

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

Incorrect Answers

A:

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

B:

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

D:

That alternative applies to EBGP over IBGP selection instead. The externally learned path can become preferred after higher priority criteria tie.

Question 172

An enterprise network designer recommends: Compare Junos route preference values across protocols before changing BGP policy. Which situation most clearly calls for this action?

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

Explanation

Correct Answer

D:

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

Incorrect Answers

A:

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.

B:

This other case would be better matched to Apply the normal BGP preference for an EBGP path over an otherwise comparable IBGP path. The externally learned path can become preferred after higher priority criteria tie.

C:

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 173

A router receives three BGP paths but only one is active and operators need to understand the decision. Which Junos networking action or protocol decision best addresses this requirement?

  1. Use the BGP origin-attribute comparison in the supported path selection sequence.
  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. Restore IP routing reachability to the route's recursive BGP next hop.

Explanation

Correct Answer

B:

This action addresses BGP selection evidence. The ranking evidence can identify the selection criterion behind the chosen path.

Incorrect Answers

A:

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 selection evidence 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 selection evidence requirement.

D:

That action targets BGP next-hop validity: The path can participate in valid best-path selection after next-hop resolution. It does not directly resolve the stated BGP selection evidence requirement.

Question 174

A Junos network engineer takes this step: Inspect detailed BGP routes, attributes, next hops, and the active-path indication. Which outcome most directly follows?

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

Explanation

Correct Answer

C:

This is the direct result of the BGP selection evidence decision: The ranking evidence can identify the selection criterion behind the chosen path.

Incorrect Answers

A:

This outcome is associated with BGP next-hop validity (Restore IP routing reachability to the route's recursive BGP next hop.), not the specified action.

B:

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.

D:

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.

Question 175

A router receives three BGP paths but only one is active and operators need to understand the decision. A colleague instead suggests: Prefer the route with the shorter AS-path length under the normal selection sequence. Which corrective approach most directly addresses the original issue?

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

Explanation

Correct Answer

D:

This corrective choice addresses BGP selection evidence. The ranking evidence can identify the selection criterion behind the chosen path.

Incorrect Answers

A:

That alternative applies to BGP next-hop validity instead. The path can participate in valid best-path selection after next-hop resolution.

B:

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

C:

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.

Question 176

An enterprise network designer recommends: Inspect detailed BGP routes, attributes, next hops, and the active-path indication. Which situation most clearly calls for this action?

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

Explanation

Correct Answer

A:

This case requires the BGP selection evidence action. The ranking evidence can identify the selection criterion behind the chosen path.

Incorrect Answers

B:

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.

C:

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.

D:

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 177

An operator needs to label routes so several downstream policies can match them consistently. Which Junos networking action or protocol decision best addresses this requirement?

  1. Use a permitted BGP export policy to prepend its own AS number to the backup announcement.
  2. Attach a standard BGP community to selected routes using routing policy.
  3. Use a BGP large community in the supported community policy design.
  4. Use local preference for iBGP-internal egress policy rather than assuming EBGP carries LOCAL_PREF.

Explanation

Correct Answer

B:

This action addresses BGP standard community. Multiple peers can classify routes by the shared community tag without matching every prefix.

Incorrect Answers

A:

That action targets AS path prepend: Remote networks may see a longer AS path and prefer the other ingress when other factors tie. It does not directly resolve the stated BGP standard community requirement.

C:

That action targets BGP large community: Extended tagging can carry structured 32-bit components without relying on legacy 16-bit community fields. It does not directly resolve the stated BGP standard community requirement.

D:

That action targets LOCAL_PREF scope: Outbound path preference can be coordinated inside the AS without relying on external propagation. It does not directly resolve the stated BGP standard community requirement.

Question 178

A Junos network engineer takes this step: Attach a standard BGP community to selected routes using routing policy. Which outcome most directly follows?

  1. Extended tagging can carry structured 32-bit components without relying on legacy 16-bit community fields.
  2. Outbound path preference can be coordinated inside the AS without relying on external propagation.
  3. Multiple peers can classify routes by the shared community tag without matching every prefix.
  4. Remote networks may see a longer AS path and prefer the other ingress when other factors tie.

Explanation

Correct Answer

C:

This is the direct result of the BGP standard community decision: Multiple peers can classify routes by the shared community tag without matching every prefix.

Incorrect Answers

A:

This outcome is associated with BGP large community (Use a BGP large community in the supported community policy design.), not the specified action.

B:

This outcome is associated with LOCAL_PREF scope (Use local preference for iBGP-internal egress policy rather than assuming EBGP carries LOCAL_PREF.), not the specified action.

D:

This outcome is associated with AS path prepend (Use a permitted BGP export policy to prepend its own AS number to the backup announcement.), not the specified action.

Question 179

An operator needs to label routes so several downstream policies can match them consistently. A colleague instead suggests: Use a permitted BGP export policy to prepend its own AS number to the backup announcement. Which corrective approach most directly addresses the original issue?

  1. Use a BGP large community in the supported community policy design.
  2. Use a permitted BGP export policy to prepend its own AS number to the backup announcement.
  3. Use local preference for iBGP-internal egress policy rather than assuming EBGP carries LOCAL_PREF.
  4. Attach a standard BGP community to selected routes using routing policy.

Explanation

Correct Answer

D:

This corrective choice addresses BGP standard community. Multiple peers can classify routes by the shared community tag without matching every prefix.

Incorrect Answers

A:

That alternative applies to BGP large community instead. Extended tagging can carry structured 32-bit components without relying on legacy 16-bit community fields.

B:

That alternative applies to AS path prepend instead. Remote networks may see a longer AS path and prefer the other ingress when other factors tie.

C:

That alternative applies to LOCAL_PREF scope instead. Outbound path preference can be coordinated inside the AS without relying on external propagation.

Question 180

An enterprise network designer recommends: Attach a standard BGP community to selected routes using routing policy. Which situation most clearly calls for this action?

  1. An operator needs to label routes so several downstream policies can match them consistently.
  2. A team expects an externally connected BGP peer to receive an AS-internal LOCAL_PREF policy value as an advertised attribute.
  3. A dual-homed enterprise wants to make one inbound provider path less attractive as a backup route.
  4. A provider needs a route tag with a global-admin field and two additional 32-bit values for fine-grained policy semantics.

Explanation

Correct Answer

A:

This case requires the BGP standard community action. Multiple peers can classify routes by the shared community tag without matching every prefix.

Incorrect Answers

B:

This other case would be better matched to Use local preference for iBGP-internal egress policy rather than assuming EBGP carries LOCAL_PREF. Outbound path preference can be coordinated inside the AS without relying on external propagation.

C:

This other case would be better matched to Use a permitted BGP export policy to prepend its own AS number to the backup announcement. Remote networks may see a longer AS path and prefer the other ingress when other factors tie.

D:

This other case would be better matched to Use a BGP large community in the supported community policy design. Extended tagging can carry structured 32-bit components without relying on legacy 16-bit community fields.

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