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Exam Code: 300-420

Exam Name Designing Cisco Enterprise Networks (ENSLD)

Certification Provider: Cisco

Corresponding Certification: CCNP Enterprise

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Designing Cisco Enterprise Networks (ENSLD) (300-420) Practice Tests

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Cisco 300-420 Practice Test 18

Question 170

The design record describes this issue: A company wants to influence which of its two ISP connections receives incoming traffic without depending on the ISP honoring MED. Which technical principle BEST explains the design decision?

  1. Route reflectors reduce the need for every iBGP speaker to peer with every other speaker, while preserving iBGP route propagation rules.
  2. BGP multipath requires compatible selected paths under the platform’s path-equivalence rules; mere coexistence of peers is not enough.
  3. Route policy can prevent undesired BGP NLRI from entering the local routing system.
  4. AS-path length can influence outside-AS best-path selection but remote networks keep final policy authority.

Explanation

Correct Answer

D:

AS-path length can influence outside-AS best-path selection but remote networks keep final policy authority. The correct engineering response is: Consider controlled AS-path prepending on the less-preferred advertisement while acknowledging external policy can override it. The observable check is: External route collectors and measured ingress traffic show whether the intended path preference is achieved.

Incorrect Answers

A:

AS-path length can influence outside-AS best-path selection but remote networks keep final policy authority. The offered choice instead concerns a different principle: Route reflectors reduce the need for every iBGP speaker to peer with every other speaker, while preserving iBGP route propagation rules. Those technical conditions are not interchangeable.

B:

AS-path length can influence outside-AS best-path selection but remote networks keep final policy authority. The offered choice instead concerns a different principle: BGP multipath requires compatible selected paths under the platform’s path-equivalence rules; mere coexistence of peers is not enough. Those technical conditions are not interchangeable.

C:

AS-path length can influence outside-AS best-path selection but remote networks keep final policy authority. The offered choice instead concerns a different principle: Route policy can prevent undesired BGP NLRI from entering the local routing system. Those technical conditions are not interchangeable.

Question 171

After designing a change for the following scenario: A company wants to influence which of its two ISP connections receives incoming traffic without depending on the ISP honoring MED. Which acceptance observation BEST establishes the intended result?

  1. External route collectors and measured ingress traffic show whether the intended path preference is achieved.
  2. Routers across the AS select the intended exit for qualifying routes and fail over to the other when required.
  3. Clients receive intended reachable prefixes through both reflectors and reflector failure does not isolate the control plane.
  4. Only approved partner prefixes are accepted and excess or private prefixes are rejected and logged.

Explanation

Correct Answer

A:

External route collectors and measured ingress traffic show whether the intended path preference is achieved. AS-path length can influence outside-AS best-path selection but remote networks keep final policy authority.

Incorrect Answers

B:

BGP local preference is used within an AS to prefer an outbound path, with higher values preferred. In the case being tested, AS-path length can influence outside-AS best-path selection but remote networks keep final policy authority. The necessary acceptance evidence is: External route collectors and measured ingress traffic show whether the intended path preference is achieved.

C:

Route reflectors reduce the need for every iBGP speaker to peer with every other speaker, while preserving iBGP route propagation rules. In the case being tested, AS-path length can influence outside-AS best-path selection but remote networks keep final policy authority. The necessary acceptance evidence is: External route collectors and measured ingress traffic show whether the intended path preference is achieved.

D:

Route policy can prevent undesired BGP NLRI from entering the local routing system. In the case being tested, AS-path length can influence outside-AS best-path selection but remote networks keep final policy authority. The necessary acceptance evidence is: External route collectors and measured ingress traffic show whether the intended path preference is achieved.

Question 172

A preventive architecture review covers this situation: A company wants to influence which of its two ISP connections receives incoming traffic without depending on the ISP honoring MED. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Test route-reflector redundancy and loop-prevention identifiers before scale-out.
  2. Track advertised AS paths and validate ingress behavior with both providers after changes.
  3. Validate multipath equivalence and hashing behavior during capacity tests.
  4. Include recursive next-hop resolution in the BGP acceptance checklist.

Explanation

Correct Answer

B:

Track advertised AS paths and validate ingress behavior with both providers after changes. This control targets the underlying design risk. AS-path length can influence outside-AS best-path selection but remote networks keep final policy authority. The follow-up acceptance check remains: External route collectors and measured ingress traffic show whether the intended path preference is achieved.

Incorrect Answers

A:

Route reflectors reduce the need for every iBGP speaker to peer with every other speaker, while preserving iBGP route propagation rules. The repeat risk here is different: AS-path length can influence outside-AS best-path selection but remote networks keep final policy authority. A directly relevant preventive control is: Track advertised AS paths and validate ingress behavior with both providers after changes.

C:

BGP multipath requires compatible selected paths under the platform’s path-equivalence rules; mere coexistence of peers is not enough. The repeat risk here is different: AS-path length can influence outside-AS best-path selection but remote networks keep final policy authority. A directly relevant preventive control is: Track advertised AS paths and validate ingress behavior with both providers after changes.

D:

BGP paths require a reachable next hop in the forwarding plane; distributing the prefix alone is not sufficient. The repeat risk here is different: AS-path length can influence outside-AS best-path selection but remote networks keep final policy authority. A directly relevant preventive control is: Track advertised AS paths and validate ingress behavior with both providers after changes.

Question 173

A new campus or WAN review presents this constraint: During a predeployment review for a logistics division, the team discovers this design gap: a company wants to influence which of its two ISP connections receives incoming traffic without depending on the ISP honoring MED. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Ensure next-hop reachability through the IGP or apply next-hop-self at an appropriate border as designed.
  2. Set higher BGP local preference for the desired exit within the local AS.
  3. Allocate at least a /25 for the present host count and separately reserve adjacent space for growth.
  4. Consider controlled AS-path prepending on the less-preferred advertisement while acknowledging external policy can override it.

Explanation

Correct Answer

D:

Consider controlled AS-path prepending on the less-preferred advertisement while acknowledging external policy can override it. This action addresses the stated design problem. AS-path length can influence outside-AS best-path selection but remote networks keep final policy authority. A practical confirmation is: External route collectors and measured ingress traffic show whether the intended path preference is achieved. The logistics division acceptance record also captures this result.

Incorrect Answers

A:

BGP paths require a reachable next hop in the forwarding plane; distributing the prefix alone is not sufficient. The actual fault is governed by a different mechanism: AS-path length can influence outside-AS best-path selection but remote networks keep final policy authority. The needed response is: Consider controlled AS-path prepending on the less-preferred advertisement while acknowledging external policy can override it.

B:

BGP local preference is used within an AS to prefer an outbound path, with higher values preferred. The actual fault is governed by a different mechanism: AS-path length can influence outside-AS best-path selection but remote networks keep final policy authority. The needed response is: Consider controlled AS-path prepending on the less-preferred advertisement while acknowledging external policy can override it.

C:

A /26 offers 62 usable conventional host addresses; a /25 offers 126, so /26 cannot accommodate 108 endpoints. The actual fault is governed by a different mechanism: AS-path length can influence outside-AS best-path selection but remote networks keep final policy authority. The needed response is: Consider controlled AS-path prepending on the less-preferred advertisement while acknowledging external policy can override it.

Question 174

For this Cisco ENSLD design case: During a predeployment review for a logistics division, the team discovers this design gap: a company wants to influence which of its two ISP connections receives incoming traffic without depending on the ISP honoring MED. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. AS-path length can influence outside-AS best-path selection but remote networks keep final policy authority.
  2. BGP local preference is used within an AS to prefer an outbound path, with higher values preferred.
  3. Route policy can prevent undesired BGP NLRI from entering the local routing system.
  4. BGP paths require a reachable next hop in the forwarding plane; distributing the prefix alone is not sufficient.

Explanation

Correct Answer

A:

AS-path length can influence outside-AS best-path selection but remote networks keep final policy authority. The correct engineering response is: Consider controlled AS-path prepending on the less-preferred advertisement while acknowledging external policy can override it. The observable check is: External route collectors and measured ingress traffic show whether the intended path preference is achieved. The logistics division acceptance record also captures this result.

Incorrect Answers

B:

AS-path length can influence outside-AS best-path selection but remote networks keep final policy authority. The offered choice instead concerns a different principle: BGP local preference is used within an AS to prefer an outbound path, with higher values preferred. Those technical conditions are not interchangeable.

C:

AS-path length can influence outside-AS best-path selection but remote networks keep final policy authority. The offered choice instead concerns a different principle: Route policy can prevent undesired BGP NLRI from entering the local routing system. Those technical conditions are not interchangeable.

D:

AS-path length can influence outside-AS best-path selection but remote networks keep final policy authority. The offered choice instead concerns a different principle: BGP paths require a reachable next hop in the forwarding plane; distributing the prefix alone is not sufficient. Those technical conditions are not interchangeable.

Question 175

During acceptance testing for this network design: During a predeployment review for a logistics division, the team discovers this design gap: a company wants to influence which of its two ISP connections receives incoming traffic without depending on the ISP honoring MED. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. Clients resolve the advertised BGP next hop and forward through the intended border router.
  2. External route collectors and measured ingress traffic show whether the intended path preference is achieved. The logistics division acceptance record also captures this result.
  3. Routers across the AS select the intended exit for qualifying routes and fail over to the other when required.
  4. Clients receive intended reachable prefixes through both reflectors and reflector failure does not isolate the control plane.

Explanation

Correct Answer

B:

External route collectors and measured ingress traffic show whether the intended path preference is achieved. The logistics division acceptance record also captures this result. AS-path length can influence outside-AS best-path selection but remote networks keep final policy authority.

Incorrect Answers

A:

BGP paths require a reachable next hop in the forwarding plane; distributing the prefix alone is not sufficient. In the case being tested, AS-path length can influence outside-AS best-path selection but remote networks keep final policy authority. The necessary acceptance evidence is: External route collectors and measured ingress traffic show whether the intended path preference is achieved. The logistics division acceptance record also captures this result.

C:

BGP local preference is used within an AS to prefer an outbound path, with higher values preferred. In the case being tested, AS-path length can influence outside-AS best-path selection but remote networks keep final policy authority. The necessary acceptance evidence is: External route collectors and measured ingress traffic show whether the intended path preference is achieved. The logistics division acceptance record also captures this result.

D:

Route reflectors reduce the need for every iBGP speaker to peer with every other speaker, while preserving iBGP route propagation rules. In the case being tested, AS-path length can influence outside-AS best-path selection but remote networks keep final policy authority. The necessary acceptance evidence is: External route collectors and measured ingress traffic show whether the intended path preference is achieved. The logistics division acceptance record also captures this result.

Question 176

Operations wants to avoid recurrence of this design flaw: During a predeployment review for a logistics division, the team discovers this design gap: a company wants to influence which of its two ISP connections receives incoming traffic without depending on the ISP honoring MED. An approval gate requires both a measurable acceptance check and a durable prevention control. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Test route-reflector redundancy and loop-prevention identifiers before scale-out.
  2. Maintain peer-specific prefix inventories and review BGP filters before provider changes.
  3. Track advertised AS paths and validate ingress behavior with both providers after changes. Apply the same control to the logistics division rollout checklist.
  4. Validate multipath equivalence and hashing behavior during capacity tests.

Explanation

Correct Answer

C:

Track advertised AS paths and validate ingress behavior with both providers after changes. Apply the same control to the logistics division rollout checklist. This control targets the underlying design risk. AS-path length can influence outside-AS best-path selection but remote networks keep final policy authority. The follow-up acceptance check remains: External route collectors and measured ingress traffic show whether the intended path preference is achieved. The logistics division acceptance record also captures this result.

Incorrect Answers

A:

Route reflectors reduce the need for every iBGP speaker to peer with every other speaker, while preserving iBGP route propagation rules. The repeat risk here is different: AS-path length can influence outside-AS best-path selection but remote networks keep final policy authority. A directly relevant preventive control is: Track advertised AS paths and validate ingress behavior with both providers after changes. Apply the same control to the logistics division rollout checklist.

B:

Route policy can prevent undesired BGP NLRI from entering the local routing system. The repeat risk here is different: AS-path length can influence outside-AS best-path selection but remote networks keep final policy authority. A directly relevant preventive control is: Track advertised AS paths and validate ingress behavior with both providers after changes. Apply the same control to the logistics division rollout checklist.

D:

BGP multipath requires compatible selected paths under the platform’s path-equivalence rules; mere coexistence of peers is not enough. The repeat risk here is different: AS-path length can influence outside-AS best-path selection but remote networks keep final policy authority. A directly relevant preventive control is: Track advertised AS paths and validate ingress behavior with both providers after changes. Apply the same control to the logistics division rollout checklist.

Question 177

A Cisco enterprise designer reviews the following scenario: A full-mesh iBGP design grows from 8 to 70 routers, producing an impractical number of peering sessions. Which action MOST DIRECTLY meets the stated design requirement?

  1. Design a redundant BGP route-reflector topology and planned cluster/client relationships.
  2. Set higher BGP local preference for the desired exit within the local AS.
  3. Apply explicit BGP inbound prefix filtering and route limits to the partner adjacency.
  4. Ensure next-hop reachability through the IGP or apply next-hop-self at an appropriate border as designed.

Explanation

Correct Answer

A:

Design a redundant BGP route-reflector topology and planned cluster/client relationships. This action addresses the stated design problem. Route reflectors reduce the need for every iBGP speaker to peer with every other speaker, while preserving iBGP route propagation rules. A practical confirmation is: Clients receive intended reachable prefixes through both reflectors and reflector failure does not isolate the control plane.

Incorrect Answers

B:

BGP local preference is used within an AS to prefer an outbound path, with higher values preferred. The actual fault is governed by a different mechanism: Route reflectors reduce the need for every iBGP speaker to peer with every other speaker, while preserving iBGP route propagation rules. The needed response is: Design a redundant BGP route-reflector topology and planned cluster/client relationships.

C:

Route policy can prevent undesired BGP NLRI from entering the local routing system. The actual fault is governed by a different mechanism: Route reflectors reduce the need for every iBGP speaker to peer with every other speaker, while preserving iBGP route propagation rules. The needed response is: Design a redundant BGP route-reflector topology and planned cluster/client relationships.

D:

BGP paths require a reachable next hop in the forwarding plane; distributing the prefix alone is not sufficient. The actual fault is governed by a different mechanism: Route reflectors reduce the need for every iBGP speaker to peer with every other speaker, while preserving iBGP route propagation rules. The needed response is: Design a redundant BGP route-reflector topology and planned cluster/client relationships.

Question 178

The network architecture board discusses the following: A full-mesh iBGP design grows from 8 to 70 routers, producing an impractical number of peering sessions. Which technical principle BEST explains the design decision?

  1. BGP paths require a reachable next hop in the forwarding plane; distributing the prefix alone is not sufficient.
  2. Route reflectors reduce the need for every iBGP speaker to peer with every other speaker, while preserving iBGP route propagation rules.
  3. Route policy can prevent undesired BGP NLRI from entering the local routing system.
  4. A feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup.

Explanation

Correct Answer

B:

Route reflectors reduce the need for every iBGP speaker to peer with every other speaker, while preserving iBGP route propagation rules. The correct engineering response is: Design a redundant BGP route-reflector topology and planned cluster/client relationships. The observable check is: Clients receive intended reachable prefixes through both reflectors and reflector failure does not isolate the control plane.

Incorrect Answers

A:

Route reflectors reduce the need for every iBGP speaker to peer with every other speaker, while preserving iBGP route propagation rules. The offered choice instead concerns a different principle: BGP paths require a reachable next hop in the forwarding plane; distributing the prefix alone is not sufficient. Those technical conditions are not interchangeable.

C:

Route reflectors reduce the need for every iBGP speaker to peer with every other speaker, while preserving iBGP route propagation rules. The offered choice instead concerns a different principle: Route policy can prevent undesired BGP NLRI from entering the local routing system. Those technical conditions are not interchangeable.

D:

Route reflectors reduce the need for every iBGP speaker to peer with every other speaker, while preserving iBGP route propagation rules. The offered choice instead concerns a different principle: a feasible successor must meet DUAL’s feasibility condition to provide a loop-free immediate backup. Those technical conditions are not interchangeable.

Question 179

The infrastructure team must validate this situation: A full-mesh iBGP design grows from 8 to 70 routers, producing an impractical number of peering sessions. Which acceptance observation BEST establishes the intended result?

  1. External route collectors and measured ingress traffic show whether the intended path preference is achieved.
  2. Routers across the AS select the intended exit for qualifying routes and fail over to the other when required.
  3. Clients receive intended reachable prefixes through both reflectors and reflector failure does not isolate the control plane.
  4. Clients resolve the advertised BGP next hop and forward through the intended border router.

Explanation

Correct Answer

C:

Clients receive intended reachable prefixes through both reflectors and reflector failure does not isolate the control plane. Route reflectors reduce the need for every iBGP speaker to peer with every other speaker, while preserving iBGP route propagation rules.

Incorrect Answers

A:

AS-path length can influence outside-AS best-path selection but remote networks keep final policy authority. In the case being tested, Route reflectors reduce the need for every iBGP speaker to peer with every other speaker, while preserving iBGP route propagation rules. The necessary acceptance evidence is: Clients receive intended reachable prefixes through both reflectors and reflector failure does not isolate the control plane.

B:

BGP local preference is used within an AS to prefer an outbound path, with higher values preferred. In the case being tested, Route reflectors reduce the need for every iBGP speaker to peer with every other speaker, while preserving iBGP route propagation rules. The necessary acceptance evidence is: Clients receive intended reachable prefixes through both reflectors and reflector failure does not isolate the control plane.

D:

BGP paths require a reachable next hop in the forwarding plane; distributing the prefix alone is not sufficient. In the case being tested, Route reflectors reduce the need for every iBGP speaker to peer with every other speaker, while preserving iBGP route propagation rules. The necessary acceptance evidence is: Clients receive intended reachable prefixes through both reflectors and reflector failure does not isolate the control plane.

Question 180

A post-incident design review discusses the following: A full-mesh iBGP design grows from 8 to 70 routers, producing an impractical number of peering sessions. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Validate multipath equivalence and hashing behavior during capacity tests.
  2. Track advertised AS paths and validate ingress behavior with both providers after changes.
  3. Document and audit local preference policy consistently at ingress border peers.
  4. Test route-reflector redundancy and loop-prevention identifiers before scale-out.

Explanation

Correct Answer

D:

Test route-reflector redundancy and loop-prevention identifiers before scale-out. This control targets the underlying design risk. Route reflectors reduce the need for every iBGP speaker to peer with every other speaker, while preserving iBGP route propagation rules. The follow-up acceptance check remains: Clients receive intended reachable prefixes through both reflectors and reflector failure does not isolate the control plane.

Incorrect Answers

A:

BGP multipath requires compatible selected paths under the platform’s path-equivalence rules; mere coexistence of peers is not enough. The repeat risk here is different: Route reflectors reduce the need for every iBGP speaker to peer with every other speaker, while preserving iBGP route propagation rules. A directly relevant preventive control is: Test route-reflector redundancy and loop-prevention identifiers before scale-out.

B:

AS-path length can influence outside-AS best-path selection but remote networks keep final policy authority. The repeat risk here is different: Route reflectors reduce the need for every iBGP speaker to peer with every other speaker, while preserving iBGP route propagation rules. A directly relevant preventive control is: Test route-reflector redundancy and loop-prevention identifiers before scale-out.

C:

BGP local preference is used within an AS to prefer an outbound path, with higher values preferred. The repeat risk here is different: Route reflectors reduce the need for every iBGP speaker to peer with every other speaker, while preserving iBGP route propagation rules. A directly relevant preventive control is: Test route-reflector redundancy and loop-prevention identifiers before scale-out.