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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 19

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.

Question 181

A BGP route may circulate inside the receiving AS but must not be advertised beyond it via ordinary eBGP propagation. Which Junos networking action or protocol decision best addresses this requirement?

  1. Use a properly designed BGP route-reflector topology with client sessions.
  2. Advertise an appropriate MED value on the relevant route toward that neighboring AS.
  3. Use a supported next-hop-self behavior at the iBGP advertisement point.
  4. Apply the well-known NO_EXPORT community to the selected advertisement.

Explanation

Correct Answer

D:

This action addresses NO_EXPORT community. BGP speakers honoring the community avoid advertising the route to external AS peers.

Incorrect Answers

A:

That action targets Route reflector signaling: Reflector clients can receive eligible iBGP routes without a full direct mesh among all clients. It does not directly resolve the stated NO_EXPORT community requirement.

B:

That action targets BGP MED export: The neighboring AS can use the metric when comparing eligible routes according to its policy. It does not directly resolve the stated NO_EXPORT community requirement.

C:

That action targets IBGP next-hop self: Clients can resolve the advertised next hop through the advertising router when designed properly. It does not directly resolve the stated NO_EXPORT community requirement.

Question 182

A Junos network engineer takes this step: Apply the well-known NO_EXPORT community to the selected advertisement. Which outcome most directly follows?

  1. BGP speakers honoring the community avoid advertising the route to external AS peers.
  2. Clients can resolve the advertised next hop through the advertising router when designed properly.
  3. Reflector clients can receive eligible iBGP routes without a full direct mesh among all clients.
  4. The neighboring AS can use the metric when comparing eligible routes according to its policy.

Explanation

Correct Answer

A:

This is the direct result of the NO_EXPORT community decision: BGP speakers honoring the community avoid advertising the route to external AS peers.

Incorrect Answers

B:

This outcome is associated with IBGP next-hop self (Use a supported next-hop-self behavior at the iBGP advertisement point.), not the specified action.

C:

This outcome is associated with Route reflector signaling (Use a properly designed BGP route-reflector topology with client sessions.), not the specified action.

D:

This outcome is associated with BGP MED export (Advertise an appropriate MED value on the relevant route toward that neighboring AS.), not the specified action.

Question 183

A BGP route may circulate inside the receiving AS but must not be advertised beyond it via ordinary eBGP propagation. A colleague instead suggests: Use a supported next-hop-self behavior at the iBGP advertisement point. Which corrective approach most directly addresses the original issue?

  1. Use a properly designed BGP route-reflector topology with client sessions.
  2. Apply the well-known NO_EXPORT community to the selected advertisement.
  3. Use a supported next-hop-self behavior at the iBGP advertisement point.
  4. Advertise an appropriate MED value on the relevant route toward that neighboring AS.

Explanation

Correct Answer

B:

This corrective choice addresses NO_EXPORT community. BGP speakers honoring the community avoid advertising the route to external AS peers.

Incorrect Answers

A:

That alternative applies to Route reflector signaling instead. Reflector clients can receive eligible iBGP routes without a full direct mesh among all clients.

C:

That alternative applies to IBGP next-hop self instead. Clients can resolve the advertised next hop through the advertising router when designed properly.

D:

That alternative applies to BGP MED export instead. The neighboring AS can use the metric when comparing eligible routes according to its policy.

Question 184

An enterprise network designer recommends: Apply the well-known NO_EXPORT community to the selected advertisement. Which situation most clearly calls for this action?

  1. A full mesh of iBGP speakers is operationally expensive in a large routing domain.
  2. An iBGP router receives external routes whose original next hops are unreachable to other iBGP clients.
  3. A BGP route may circulate inside the receiving AS but must not be advertised beyond it via ordinary eBGP propagation.
  4. An organization has two interconnects to the same upstream AS and wants to signal a preferred ingress link.

Explanation

Correct Answer

C:

This case requires the NO_EXPORT community action. BGP speakers honoring the community avoid advertising the route to external AS peers.

Incorrect Answers

A:

This other case would be better matched to Use a properly designed BGP route-reflector topology with client sessions. Reflector clients can receive eligible iBGP routes without a full direct mesh among all clients.

B:

This other case would be better matched to Use a supported next-hop-self behavior at the iBGP advertisement point. Clients can resolve the advertised next hop through the advertising router when designed properly.

D:

This other case would be better matched to Advertise an appropriate MED value on the relevant route toward that neighboring AS. The neighboring AS can use the metric when comparing eligible routes according to its policy.

Question 185

A dual-homed enterprise wants to make one inbound provider path less attractive as a backup route. 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. Use a BGP large community in the supported community policy design.
  3. Attach a standard BGP community to selected routes using routing policy.
  4. Use local preference for iBGP-internal egress policy rather than assuming EBGP carries LOCAL_PREF.

Explanation

Correct Answer

A:

This action addresses AS path prepend. Remote networks may see a longer AS path and prefer the other ingress when other factors tie.

Incorrect Answers

B:

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 AS path prepend requirement.

C:

That action targets BGP standard community: Multiple peers can classify routes by the shared community tag without matching every prefix. It does not directly resolve the stated AS path prepend 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 AS path prepend requirement.

Question 186

A Junos network engineer takes this step: Use a permitted BGP export policy to prepend its own AS number to the backup announcement. Which outcome most directly follows?

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

Explanation

Correct Answer

B:

This is the direct result of the AS path prepend decision: Remote networks may see a longer AS path and prefer the other ingress when other factors tie.

Incorrect Answers

A:

This outcome is associated with BGP standard community (Attach a standard BGP community to selected routes using routing policy.), not the specified action.

C:

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 BGP large community (Use a BGP large community in the supported community policy design.), not the specified action.

Question 187

A dual-homed enterprise wants to make one inbound provider path less attractive as a backup route. A colleague instead suggests: Use local preference for iBGP-internal egress policy rather than assuming EBGP carries LOCAL_PREF. Which corrective approach most directly addresses the original issue?

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

Explanation

Correct Answer

C:

This corrective choice addresses AS path prepend. Remote networks may see a longer AS path and prefer the other ingress when other factors tie.

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

D:

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

Question 188

An enterprise network designer recommends: Use a permitted BGP export policy to prepend its own AS number to the backup announcement. Which situation most clearly calls for this action?

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

Explanation

Correct Answer

D:

This case requires the AS path prepend action. Remote networks may see a longer AS path and prefer the other ingress when other factors tie.

Incorrect Answers

A:

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.

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 Attach a standard BGP community to selected routes using routing policy. Multiple peers can classify routes by the shared community tag without matching every prefix.

Question 189

An iBGP router receives external routes whose original next hops are unreachable to other iBGP clients. Which Junos networking action or protocol decision best addresses this requirement?

  1. Use a properly designed BGP route-reflector topology with client sessions.
  2. Use a supported next-hop-self behavior at the iBGP advertisement point.
  3. Apply the well-known NO_EXPORT community to the selected advertisement.
  4. Advertise an appropriate MED value on the relevant route toward that neighboring AS.

Explanation

Correct Answer

B:

This action addresses IBGP next-hop self. Clients can resolve the advertised next hop through the advertising router when designed properly.

Incorrect Answers

A:

That action targets Route reflector signaling: Reflector clients can receive eligible iBGP routes without a full direct mesh among all clients. It does not directly resolve the stated IBGP next-hop self requirement.

C:

That action targets NO_EXPORT community: BGP speakers honoring the community avoid advertising the route to external AS peers. It does not directly resolve the stated IBGP next-hop self requirement.

D:

That action targets BGP MED export: The neighboring AS can use the metric when comparing eligible routes according to its policy. It does not directly resolve the stated IBGP next-hop self requirement.

Question 190

A Junos network engineer takes this step: Use a supported next-hop-self behavior at the iBGP advertisement point. Which outcome most directly follows?

  1. The neighboring AS can use the metric when comparing eligible routes according to its policy.
  2. Reflector clients can receive eligible iBGP routes without a full direct mesh among all clients.
  3. Clients can resolve the advertised next hop through the advertising router when designed properly.
  4. BGP speakers honoring the community avoid advertising the route to external AS peers.

Explanation

Correct Answer

C:

This is the direct result of the IBGP next-hop self decision: Clients can resolve the advertised next hop through the advertising router when designed properly.

Incorrect Answers

A:

This outcome is associated with BGP MED export (Advertise an appropriate MED value on the relevant route toward that neighboring AS.), not the specified action.

B:

This outcome is associated with Route reflector signaling (Use a properly designed BGP route-reflector topology with client sessions.), not the specified action.

D:

This outcome is associated with NO_EXPORT community (Apply the well-known NO_EXPORT community to the selected advertisement.), not the specified action.

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