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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 10

Question 90

During acceptance testing after deploy an explicit interconnection and staged traffic cutover to fabric borders., which evidence is most relevant?

  1. A map lookup resolves the endpoint identifier to its fabric-edge locator.
  2. External routes appear through the fabric border with approved reachability.
  3. Endpoint map requests succeed through the surviving control-plane node.
  4. Legacy VLAN hosts retain routes during controlled fabric border introduction.

Explanation

Correct Answer

D:

Legacy VLAN hosts retain routes during controlled fabric border introduction. This is the targeted operational evidence for the change. Avoid moving gateway ownership before legacy forwarding dependencies are ready. 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: Register endpoint identity-to-location information with the LISP control plane. LISP separates endpoint identifiers from routable locators. 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: Use a fabric border node to connect overlay and external routing domains. Border nodes provide policy-controlled connectivity beyond the fabric. 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: Provide redundant fabric control-plane nodes and verify registrations. Endpoint location availability requires resilient mapping services. 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 91

Voice packets suffer behind large bulk transfers on a congested uplink. Which action most directly addresses this situation?

  1. Preserve a consistent QoS trust boundary and mark traffic at a controlled ingress.
  2. Use CBWFQ with an explicit class bandwidth allocation.
  3. Apply LLQ priority to classified real-time voice with an appropriate bandwidth limit.
  4. Classify and remark untrusted traffic at the network edge.

Explanation

Correct Answer

C:

Strict priority reduces queue delay while policing prevents starvation. The most direct remediation is apply LLQ priority to classified real-time voice with an appropriate bandwidth limit. A practical acceptance test is queue statistics show voice in the priority queue and acceptable drops. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

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: voice packets suffer behind large bulk transfers on a congested uplink.

B:

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: voice packets suffer behind large bulk transfers on a congested uplink.

D:

This choice addresses a different situation: An ingress customer sends false EF-marked data packets. DSCP should be trusted only from approved sources. It does not specifically correct the issue here: voice packets suffer behind large bulk transfers on a congested uplink.

Question 92

An operator has applied the following change: apply LLQ priority to classified real-time voice with an appropriate bandwidth limit. Which observation best confirms it works?

  1. Egress packet captures retain intended DSCP values after classification.
  2. Queue statistics show voice in the priority queue and acceptable drops.
  3. Queue counters show the class receiving its guaranteed bandwidth when congested.
  4. Packet capture shows unauthorized EF traffic normalized at the ingress boundary.

Explanation

Correct Answer

B:

Queue statistics show voice in the priority queue and acceptable drops. This is the targeted operational evidence for the change. Strict priority reduces queue delay while policing prevents starvation. 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: 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.

D:

This observation validates another operation: Classify and remark untrusted traffic at the network edge. DSCP should be trusted only from approved sources. 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 93

A switch is classifying packets but downstream links lose their DSCP values. What is the most effective configuration or design response?

  1. Preserve a consistent QoS trust boundary and mark traffic at a controlled ingress.
  2. Apply the service policy in the direction where the desired queueing occurs.
  3. Configure an appropriate priority-queue policing bound.
  4. Use shaping where buffering to a target rate is required.

Explanation

Correct Answer

A:

Untrusted or rewritten markings can defeat downstream QoS classification. The most direct remediation is preserve a consistent QoS trust boundary and mark traffic at a controlled ingress. A practical acceptance test is egress packet captures retain intended DSCP values after classification. This distinguishes a configured intention from operational success.

Incorrect Answers

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: a switch is classifying packets but downstream links lose their DSCP values.

C:

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: a switch is classifying packets but downstream links lose their DSCP values.

D:

This choice addresses a different situation: A policy uses `police` and users expect packets to be delayed smoothly. Policing normally drops or remarks excess packets rather than smoothing them. It does not specifically correct the issue here: a switch is classifying packets but downstream links lose their DSCP values.

Question 94

After implementing preserve a consistent QoS trust boundary and mark traffic at a controlled ingress., which operational evidence should an engineer collect?

  1. The interface shows the policy attached under the intended output direction.
  2. Queue statistics show a priority cap and continuing best-effort service.
  3. Output rates are smoothed with queues instead of excess-packet drops.
  4. Egress packet captures retain intended DSCP values after classification.

Explanation

Correct Answer

D:

Egress packet captures retain intended DSCP values after classification. This is the targeted operational evidence for the change. Untrusted or rewritten markings can defeat downstream QoS classification. 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 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.

B:

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.

C:

This observation validates another operation: Use shaping where buffering to a target rate is required. Policing normally drops or remarks excess packets rather than smoothing them. 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 95

A policy map is attached to the wrong direction of a WAN link. Which change should the network engineer prioritize?

  1. Use CBWFQ with an explicit class bandwidth allocation.
  2. Classify and remark untrusted traffic at the network edge.
  3. Apply the service policy in the direction where the desired queueing occurs.
  4. Apply outbound shaping to the committed rate on the WAN parent policy.

Explanation

Correct Answer

C:

Outbound congestion management acts on packets leaving an interface. The most direct remediation is apply the service policy in the direction where the desired queueing occurs. A practical acceptance test is the interface shows the policy attached under the intended output direction. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

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 is attached to the wrong direction of a WAN link.

B:

This choice addresses a different situation: An ingress customer sends false EF-marked data packets. DSCP should be trusted only from approved sources. It does not specifically correct the issue here: a policy map is attached to the wrong direction of a WAN link.

D:

This choice addresses a different situation: A router sends beyond a provider contracted rate in bursts. Shaping buffers bursts rather than relying on provider ingress discards. It does not specifically correct the issue here: a policy map is attached to the wrong direction of a WAN link.

Question 96

The change request says: apply the service policy in the direction where the desired queueing occurs. Which verification result is most decisive?

  1. Queue counters show the class receiving its guaranteed bandwidth when congested.
  2. The interface shows the policy attached under the intended output direction.
  3. Packet capture shows unauthorized EF traffic normalized at the ingress boundary.
  4. Measured outbound average matches the service contract with queue occupancy.

Explanation

Correct Answer

B:

The interface shows the policy attached under the intended output direction. This is the targeted operational evidence for the change. Outbound congestion management acts on packets leaving an interface. 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 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.

C:

This observation validates another operation: Classify and remark untrusted traffic at the network edge. DSCP should be trusted only from approved sources. 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 outbound shaping to the committed rate on the WAN parent policy. Shaping buffers bursts rather than relying on provider ingress discards. 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 97

Bulk backup flows must receive a guaranteed minimum rate under congestion. Which remediation best resolves the described symptom?

  1. Use CBWFQ with an explicit class bandwidth allocation.
  2. Configure an appropriate priority-queue policing bound.
  3. Use shaping where buffering to a target rate is required.
  4. Verify class-map `match-all` versus `match-any` semantics.

Explanation

Correct Answer

A:

Class-based bandwidth reserves service during congestion without making the class strict priority. The most direct remediation is use CBWFQ with an explicit class bandwidth allocation. A practical acceptance test is queue counters show the class receiving its guaranteed bandwidth when congested. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

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: bulk backup flows must receive a guaranteed minimum rate under congestion.

C:

This choice addresses a different situation: A policy uses `police` and users expect packets to be delayed smoothly. Policing normally drops or remarks excess packets rather than smoothing them. It does not specifically correct the issue here: bulk backup flows must receive a guaranteed minimum rate under congestion.

D:

This choice addresses a different situation: Traffic is being matched by access group but does not enter the chosen class. All conditions are required for match-all whereas any one satisfies match-any. It does not specifically correct the issue here: bulk backup flows must receive a guaranteed minimum rate under congestion.

Question 98

A post-change test follows this action: use CBWFQ with an explicit class bandwidth allocation. Which result demonstrates success?

  1. Queue statistics show a priority cap and continuing best-effort service.
  2. Output rates are smoothed with queues instead of excess-packet drops.
  3. Class counters increment only for packets matching the selected logic.
  4. Queue counters show the class receiving its guaranteed bandwidth when congested.

Explanation

Correct Answer

D:

Queue counters show the class receiving its guaranteed bandwidth when congested. This is the targeted operational evidence for the change. Class-based bandwidth reserves service during congestion without making the class 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: 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.

B:

This observation validates another operation: Use shaping where buffering to a target rate is required. Policing normally drops or remarks excess packets rather than smoothing them. 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: Verify class-map `match-all` versus `match-any` semantics. All conditions are required for match-all whereas any one satisfies match-any. 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 99

Best-effort packets are starving while a priority queue dominates. How should the team implement the required behavior?

  1. Classify and remark untrusted traffic at the network edge.
  2. Apply outbound shaping to the committed rate on the WAN parent policy.
  3. Configure an appropriate priority-queue policing bound.
  4. Correct the specific class match statements before relying on class-default.

Explanation

Correct Answer

C:

An unbounded strict priority class can monopolize the output scheduler. The most direct remediation is configure an appropriate priority-queue policing bound. A practical acceptance test is queue statistics show a priority cap and continuing best-effort service. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: An ingress customer sends false EF-marked data packets. DSCP should be trusted only from approved sources. It does not specifically correct the issue here: best-effort packets are starving while a priority queue dominates.

B:

This choice addresses a different situation: A router sends beyond a provider contracted rate in bursts. Shaping buffers bursts rather than relying on provider ingress discards. It does not specifically correct the issue here: best-effort packets are starving while a priority queue dominates.

D:

This choice addresses a different situation: The policy-map class default is unexpectedly catching voice traffic. Class-default matches traffic not classified by previous policy classes. It does not specifically correct the issue here: best-effort packets are starving while a priority queue dominates.

Question 100

During acceptance testing after configure an appropriate priority-queue policing bound., which evidence is most relevant?

  1. Packet capture shows unauthorized EF traffic normalized at the ingress boundary.
  2. Queue statistics show a priority cap and continuing best-effort service.
  3. Measured outbound average matches the service contract with queue occupancy.
  4. Voice packets appear under their intended named class rather than class-default.

Explanation

Correct Answer

B:

Queue statistics show a priority cap and continuing best-effort service. This is the targeted operational evidence for the change. An unbounded strict priority class can monopolize the output scheduler. 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: Classify and remark untrusted traffic at the network edge. DSCP should be trusted only from approved sources. 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 outbound shaping to the committed rate on the WAN parent policy. Shaping buffers bursts rather than relying on provider ingress discards. 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: Correct the specific class match statements before relying on class-default. Class-default matches traffic not classified by previous policy classes. 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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