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Exam Code: 350-401
Exam Name: Implementing Cisco Enterprise Network Core Technologies (ENCOR)
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Implementing Cisco Enterprise Network Core Technologies (ENCOR) 350-401 Practice Test 12

Question 110

During acceptance testing after correct the specific class match statements before relying on class-default., which evidence is most relevant?

  1. Drops correlate with queue depth and rate under a controlled traffic test.
  2. Queue output shows control class separate from voice LLQ.
  3. Per-class queue utilization changes on the actual congested egress.
  4. Voice packets appear under their intended named class rather than class-default.

Explanation

Correct Answer

D:

Voice packets appear under their intended named class rather than class-default. This is the targeted operational evidence for the change. Class-default matches traffic not classified by previous policy classes. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Use queue-limit or buffering diagnostics to assess burst behavior. Guaranteed bandwidth does not eliminate queue overflow during short bursts. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

B:

This observation validates another operation: Allocate a separate bandwidth class with suitable queuing treatment. Not every control or interactive flow needs strict priority. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Place shaping at the effective bottleneck or tunnel egress as appropriate. QoS must be enforced where serialization or service rate constrains traffic. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

Question 111

A video queue is full even though the class has bandwidth configured. How should the team implement the required behavior?

  1. Translate or trust the appropriate CoS/DSCP markings at the switch boundary.
  2. Attach the policy with `service-policy` to the correct interface and direction.
  3. Use queue-limit or buffering diagnostics to assess burst behavior.
  4. Apply LLQ priority to classified real-time voice with an appropriate bandwidth limit.

Explanation

Correct Answer

C:

Guaranteed bandwidth does not eliminate queue overflow during short bursts. The most direct remediation is use queue-limit or buffering diagnostics to assess burst behavior. A practical acceptance test is drops correlate with queue depth and rate under a controlled traffic test. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: A branch is honoring DSCP but not Layer-2 class-of-service. 802.1p CoS and IP DSCP belong to different encapsulation fields. It does not specifically correct the issue here: a video queue is full even though the class has bandwidth configured.

B:

This choice addresses a different situation: A policy map shows zero counters after being configured. Defining a map without binding it does not affect forwarding. It does not specifically correct the issue here: a video queue is full even though the class has bandwidth configured.

D:

This choice addresses a different situation: Voice packets suffer behind large bulk transfers on a congested uplink. Strict priority reduces queue delay while policing prevents starvation. It does not specifically correct the issue here: a video queue is full even though the class has bandwidth configured.

Question 112

An operator has applied the following change: use queue-limit or buffering diagnostics to assess burst behavior. Which observation best confirms it works?

  1. Marked 802.1Q frames and IP headers reflect the intended mapping.
  2. Drops correlate with queue depth and rate under a controlled traffic test.
  3. `show policy-map interface` displays the service policy and increasing counters.
  4. Queue statistics show voice in the priority queue and acceptable drops.

Explanation

Correct Answer

B:

Drops correlate with queue depth and rate under a controlled traffic test. This is the targeted operational evidence for the change. Guaranteed bandwidth does not eliminate queue overflow during short bursts. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Translate or trust the appropriate CoS/DSCP markings at the switch boundary. 802.1p CoS and IP DSCP belong to different encapsulation fields. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Attach the policy with `service-policy` to the correct interface and direction. Defining a map without binding it does not affect forwarding. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

D:

This observation validates another operation: Apply LLQ priority to classified real-time voice with an appropriate bandwidth limit. Strict priority reduces queue delay while policing prevents starvation. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

Question 113

A branch is honoring DSCP but not Layer-2 class-of-service. What is the most appropriate corrective measure?

  1. Translate or trust the appropriate CoS/DSCP markings at the switch boundary.
  2. Allocate a separate bandwidth class with suitable queuing treatment.
  3. Place shaping at the effective bottleneck or tunnel egress as appropriate.
  4. Preserve a consistent QoS trust boundary and mark traffic at a controlled ingress.

Explanation

Correct Answer

A:

802.1p CoS and IP DSCP belong to different encapsulation fields. The most direct remediation is translate or trust the appropriate CoS/DSCP markings at the switch boundary. A practical acceptance test is marked 802.1Q frames and IP headers reflect the intended mapping. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: A small control flow needs low-latency service but should not use the voice queue. Not every control or interactive flow needs strict priority. It does not specifically correct the issue here: a branch is honoring DSCP but not Layer-2 class-of-service.

C:

This choice addresses a different situation: An upstream interface is uncongested while a slow tunnel is overloaded. QoS must be enforced where serialization or service rate constrains traffic. It does not specifically correct the issue here: a branch is honoring DSCP but not Layer-2 class-of-service.

D:

This choice addresses a different situation: A switch is classifying packets but downstream links lose their DSCP values. Untrusted or rewritten markings can defeat downstream QoS classification. It does not specifically correct the issue here: a branch is honoring DSCP but not Layer-2 class-of-service.

Question 114

After implementing translate or trust the appropriate CoS/DSCP markings at the switch boundary., which operational evidence should an engineer collect?

  1. Queue output shows control class separate from voice LLQ.
  2. Per-class queue utilization changes on the actual congested egress.
  3. Egress packet captures retain intended DSCP values after classification.
  4. Marked 802.1Q frames and IP headers reflect the intended mapping.

Explanation

Correct Answer

D:

Marked 802.1Q frames and IP headers reflect the intended mapping. This is the targeted operational evidence for the change. 802.1p CoS and IP DSCP belong to different encapsulation fields. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Allocate a separate bandwidth class with suitable queuing treatment. Not every control or interactive flow needs strict priority. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

B:

This observation validates another operation: Place shaping at the effective bottleneck or tunnel egress as appropriate. QoS must be enforced where serialization or service rate constrains traffic. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Preserve a consistent QoS trust boundary and mark traffic at a controlled ingress. Untrusted or rewritten markings can defeat downstream QoS classification. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

Question 115

A small control flow needs low-latency service but should not use the voice queue. Which action most directly addresses this situation?

  1. Attach the policy with `service-policy` to the correct interface and direction.
  2. Apply LLQ priority to classified real-time voice with an appropriate bandwidth limit.
  3. Allocate a separate bandwidth class with suitable queuing treatment.
  4. Apply the service policy in the direction where the desired queueing occurs.

Explanation

Correct Answer

C:

Not every control or interactive flow needs strict priority. The most direct remediation is allocate a separate bandwidth class with suitable queuing treatment. A practical acceptance test is queue output shows control class separate from voice LLQ. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: A policy map shows zero counters after being configured. Defining a map without binding it does not affect forwarding. It does not specifically correct the issue here: a small control flow needs low-latency service but should not use the voice queue.

B:

This choice addresses a different situation: Voice packets suffer behind large bulk transfers on a congested uplink. Strict priority reduces queue delay while policing prevents starvation. It does not specifically correct the issue here: a small control flow needs low-latency service but should not use the voice queue.

D:

This choice addresses a different situation: A policy map is attached to the wrong direction of a WAN link. Outbound congestion management acts on packets leaving an interface. It does not specifically correct the issue here: a small control flow needs low-latency service but should not use the voice queue.

Question 116

The change request says: allocate a separate bandwidth class with suitable queuing treatment. Which verification result is most decisive?

  1. `show policy-map interface` displays the service policy and increasing counters.
  2. Queue output shows control class separate from voice LLQ.
  3. Queue statistics show voice in the priority queue and acceptable drops.
  4. The interface shows the policy attached under the intended output direction.

Explanation

Correct Answer

B:

Queue output shows control class separate from voice LLQ. This is the targeted operational evidence for the change. Not every control or interactive flow needs strict priority. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Attach the policy with `service-policy` to the correct interface and direction. Defining a map without binding it does not affect forwarding. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Apply LLQ priority to classified real-time voice with an appropriate bandwidth limit. Strict priority reduces queue delay while policing prevents starvation. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

D:

This observation validates another operation: Apply the service policy in the direction where the desired queueing occurs. Outbound congestion management acts on packets leaving an interface. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

Question 117

A policy map shows zero counters after being configured. What is the most effective configuration or design response?

  1. Attach the policy with `service-policy` to the correct interface and direction.
  2. Place shaping at the effective bottleneck or tunnel egress as appropriate.
  3. Preserve a consistent QoS trust boundary and mark traffic at a controlled ingress.
  4. Use CBWFQ with an explicit class bandwidth allocation.

Explanation

Correct Answer

A:

Defining a map without binding it does not affect forwarding. The most direct remediation is attach the policy with `service-policy` to the correct interface and direction. A practical acceptance test is `show policy-map interface` displays the service policy and increasing counters. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: An upstream interface is uncongested while a slow tunnel is overloaded. QoS must be enforced where serialization or service rate constrains traffic. It does not specifically correct the issue here: a policy map shows zero counters after being configured.

C:

This choice addresses a different situation: A switch is classifying packets but downstream links lose their DSCP values. Untrusted or rewritten markings can defeat downstream QoS classification. It does not specifically correct the issue here: a policy map shows zero counters after being configured.

D:

This choice addresses a different situation: Bulk backup flows must receive a guaranteed minimum rate under congestion. Class-based bandwidth reserves service during congestion without making the class strict priority. It does not specifically correct the issue here: a policy map shows zero counters after being configured.

Question 118

A post-change test follows this action: attach the policy with `service-policy` to the correct interface and direction. Which result demonstrates success?

  1. Per-class queue utilization changes on the actual congested egress.
  2. Egress packet captures retain intended DSCP values after classification.
  3. Queue counters show the class receiving its guaranteed bandwidth when congested.
  4. `show policy-map interface` displays the service policy and increasing counters.

Explanation

Correct Answer

D:

`show policy-map interface` displays the service policy and increasing counters. This is the targeted operational evidence for the change. Defining a map without binding it does not affect forwarding. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Place shaping at the effective bottleneck or tunnel egress as appropriate. QoS must be enforced where serialization or service rate constrains traffic. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

B:

This observation validates another operation: Preserve a consistent QoS trust boundary and mark traffic at a controlled ingress. Untrusted or rewritten markings can defeat downstream QoS classification. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Use CBWFQ with an explicit class bandwidth allocation. Class-based bandwidth reserves service during congestion without making the class strict priority. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

Question 119

An upstream interface is uncongested while a slow tunnel is overloaded. Which change should the network engineer prioritize?

  1. Apply LLQ priority to classified real-time voice with an appropriate bandwidth limit.
  2. Apply the service policy in the direction where the desired queueing occurs.
  3. Place shaping at the effective bottleneck or tunnel egress as appropriate.
  4. Configure an appropriate priority-queue policing bound.

Explanation

Correct Answer

C:

QoS must be enforced where serialization or service rate constrains traffic. The most direct remediation is place shaping at the effective bottleneck or tunnel egress as appropriate. A practical acceptance test is per-class queue utilization changes on the actual congested egress. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: Voice packets suffer behind large bulk transfers on a congested uplink. Strict priority reduces queue delay while policing prevents starvation. It does not specifically correct the issue here: an upstream interface is uncongested while a slow tunnel is overloaded.

B:

This choice addresses a different situation: A policy map is attached to the wrong direction of a WAN link. Outbound congestion management acts on packets leaving an interface. It does not specifically correct the issue here: an upstream interface is uncongested while a slow tunnel is overloaded.

D:

This choice addresses a different situation: Best-effort packets are starving while a priority queue dominates. An unbounded strict priority class can monopolize the output scheduler. It does not specifically correct the issue here: an upstream interface is uncongested while a slow tunnel is overloaded.

Question 120

During acceptance testing after place shaping at the effective bottleneck or tunnel egress as appropriate., which evidence is most relevant?

  1. Queue statistics show voice in the priority queue and acceptable drops.
  2. Per-class queue utilization changes on the actual congested egress.
  3. The interface shows the policy attached under the intended output direction.
  4. Queue statistics show a priority cap and continuing best-effort service.

Explanation

Correct Answer

B:

Per-class queue utilization changes on the actual congested egress. This is the targeted operational evidence for the change. QoS must be enforced where serialization or service rate constrains traffic. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Apply LLQ priority to classified real-time voice with an appropriate bandwidth limit. Strict priority reduces queue delay while policing prevents starvation. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Apply the service policy in the direction where the desired queueing occurs. Outbound congestion management acts on packets leaving an interface. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

D:

This observation validates another operation: Configure an appropriate priority-queue policing bound. An unbounded strict priority class can monopolize the output scheduler. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

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