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HP HPE7-A08 Practice Test 41

Question 400

A routed campus uses a six-bit value in the IP differentiated services header. What is being read?

  1. Trust DSCP at authorized boundary
  2. DSCP field and IP precedence
  3. 802.1p PCP and CoS interpretation
  4. Queue-profile mapping

Explanation

Correct Answer

B:

DSCP encodes IP-layer per-hop class information. The IP header DSCP identifies differentiated services handling across Layer 3 hops.

Incorrect Answers

A:

Only approved sources should have their IP DSCP markings accepted as trustworthy. But this does not address the case requirement to identify the Layer 3 QoS marker.

C:

PCP in the VLAN tag carries Layer 2 class-of-service markings. But this does not address the case requirement to identify the Layer 3 QoS marker.

D:

QoS maps local priorities or marked classes to actual egress queues. But this does not address the case requirement to identify the Layer 3 QoS marker.

Question 401

Voice packets are correctly marked but share best-effort egress scheduling. What mapping must be checked?

  1. 802.1p PCP and CoS interpretation
  2. Classify and remark untrusted traffic
  3. Queue-profile mapping
  4. Verify active QoS classification

Explanation

Correct Answer

C:

Queue profiles associate priority classes with actual egress queues. QoS maps local priorities or marked classes to actual egress queues.

Incorrect Answers

A:

PCP in the VLAN tag carries Layer 2 class-of-service markings. But this does not address the case requirement to place marked voice traffic in the correct queue.

B:

Re-marking based on policy prevents clients from arbitrarily claiming high priority. But this does not address the case requirement to place marked voice traffic in the correct queue.

D:

Applied maps and counters show whether packets receive intended treatment. But this does not address the case requirement to place marked voice traffic in the correct queue.

Question 402

An operator suspects interface 1/1/1 ignores global DSCP trust. What should be inspected?

  1. Classify and remark untrusted traffic
  2. 802.1p PCP and CoS interpretation
  3. Trust DSCP at authorized boundary
  4. Verify active QoS classification

Explanation

Correct Answer

D:

Applied QoS trust and classification counters reveal effective behavior. Applied maps and counters show whether packets receive intended treatment.

Incorrect Answers

A:

Re-marking based on policy prevents clients from arbitrarily claiming high priority. But this does not address the case requirement to verify switch treatment of marked packets.

B:

PCP in the VLAN tag carries Layer 2 class-of-service markings. But this does not address the case requirement to verify switch treatment of marked packets.

C:

Only approved sources should have their IP DSCP markings accepted as trustworthy. But this does not address the case requirement to verify switch treatment of marked packets.

Question 403

A laptop changes its DSCP bits to expedited forwarding but is not a trusted source. What edge policy should override it?

  1. Queue-profile mapping
  2. Classify and remark untrusted traffic
  3. 802.1p PCP and CoS interpretation
  4. Trust DSCP at authorized boundary

Explanation

Correct Answer

B:

Re-marking protects priority treatment from abuse. Re-marking based on policy prevents clients from arbitrarily claiming high priority.

Incorrect Answers

A:

QoS maps local priorities or marked classes to actual egress queues. But this does not address the case requirement to enforce classification independent of client claims.

C:

PCP in the VLAN tag carries Layer 2 class-of-service markings. But this does not address the case requirement to enforce classification independent of client claims.

D:

Only approved sources should have their IP DSCP markings accepted as trustworthy. But this does not address the case requirement to enforce classification independent of client claims.

Question 404

Packets match voice DSCP but enter the wrong egress queue. What setting is most likely missing?

  1. 802.1p PCP and CoS interpretation
  2. Trust DSCP at authorized boundary
  3. Queue-profile mapping
  4. DSCP field and IP precedence

Explanation

Correct Answer

C:

DSCP-to-local-priority and queue mapping must align. QoS maps local priorities or marked classes to actual egress queues.

Incorrect Answers

A:

PCP in the VLAN tag carries Layer 2 class-of-service markings. But this does not address the case requirement to map the marked class to intended forwarding treatment.

B:

Only approved sources should have their IP DSCP markings accepted as trustworthy. But this does not address the case requirement to map the marked class to intended forwarding treatment.

D:

The IP header DSCP identifies differentiated services handling across Layer 3 hops. But this does not address the case requirement to map the marked class to intended forwarding treatment.

Question 405

An analyst confuses CoS 5 in a VLAN tag with DSCP 46 in IP. Which field carries CoS?

  1. 802.1p PCP and CoS interpretation
  2. Classify and remark untrusted traffic
  3. Verify active QoS classification
  4. Queue-profile mapping

Explanation

Correct Answer

A:

802.1Q priority code point is the Layer 2 carrier. PCP in the VLAN tag carries Layer 2 class-of-service markings.

Incorrect Answers

B:

Re-marking based on policy prevents clients from arbitrarily claiming high priority. But this does not address the case requirement to locate the Ethernet priority bits.

C:

Applied maps and counters show whether packets receive intended treatment. But this does not address the case requirement to locate the Ethernet priority bits.

D:

QoS maps local priorities or marked classes to actual egress queues. But this does not address the case requirement to locate the Ethernet priority bits.

Question 406

A low-latency control stream needs expedited service over large bulk transfers on a congested uplink. Which queue behavior should be evaluated?

  1. Traffic policing
  2. Strict-priority queue treatment
  3. End-to-end QoS trust consistency
  4. Queue drop and utilization monitoring

Explanation

Correct Answer

B:

Strict priority can reduce queuing delay for the selected class. Strict scheduling services a preferred queue ahead of lower priorities and must be sized to avoid starvation.

Incorrect Answers

A:

Policing enforces a traffic rate and can drop or remark nonconforming packets. But this does not address the case requirement to serve a sensitive class promptly under contention.

C:

QoS treatment must remain coherent across transit devices and trust boundaries. But this does not address the case requirement to serve a sensitive class promptly under contention.

D:

Queue counters reveal congestion, egress drops and classes experiencing loss. But this does not address the case requirement to serve a sensitive class promptly under contention.

Question 407

Data classes need defined fair shares rather than one class monopolizing egress. Which scheduling model helps?

  1. Traffic policing
  2. Weighted deficit round robin
  3. Strict-priority queue treatment
  4. Traffic shaping

Explanation

Correct Answer

B:

Weighted round robin or deficit variants divide bandwidth. Weighted scheduling distributes egress service among classes according to configured weights.

Incorrect Answers

A:

Policing enforces a traffic rate and can drop or remark nonconforming packets. But this does not address the case requirement to allocate service fairly among multiple queues.

C:

Strict scheduling services a preferred queue ahead of lower priorities and must be sized to avoid starvation. But this does not address the case requirement to allocate service fairly among multiple queues.

D:

Shaping buffers and smooths traffic toward a configured rate rather than simply dropping every excess burst. But this does not address the case requirement to allocate service fairly among multiple queues.

Question 408

A sender must smooth outbound bursts below a WAN contract limit while buffering when feasible. Which mechanism fits?

  1. Weighted deficit round robin
  2. Strict-priority queue treatment
  3. Traffic shaping
  4. Queue drop and utilization monitoring

Explanation

Correct Answer

C:

Shaping regulates departure rate using queueing. Shaping buffers and smooths traffic toward a configured rate rather than simply dropping every excess burst.

Incorrect Answers

A:

Weighted scheduling distributes egress service among classes according to configured weights. But this does not address the case requirement to smooth traffic rather than immediately discard every burst.

B:

Strict scheduling services a preferred queue ahead of lower priorities and must be sized to avoid starvation. But this does not address the case requirement to smooth traffic rather than immediately discard every burst.

D:

Queue counters reveal congestion, egress drops and classes experiencing loss. But this does not address the case requirement to smooth traffic rather than immediately discard every burst.

Question 409

A backup application must have its excess traffic dropped when it exceeds an enforced rate. Which mechanism applies?

  1. Traffic shaping
  2. Weighted deficit round robin
  3. Strict-priority queue treatment
  4. Traffic policing

Explanation

Correct Answer

D:

Policing enforces a traffic profile and penalizes excess. Policing enforces a traffic rate and can drop or remark nonconforming packets.

Incorrect Answers

A:

Shaping buffers and smooths traffic toward a configured rate rather than simply dropping every excess burst. But this does not address the case requirement to cap an uncontrolled bandwidth consumer.

B:

Weighted scheduling distributes egress service among classes according to configured weights. But this does not address the case requirement to cap an uncontrolled bandwidth consumer.

C:

Strict scheduling services a preferred queue ahead of lower priorities and must be sized to avoid starvation. But this does not address the case requirement to cap an uncontrolled bandwidth consumer.

Question 410

Users report jitter although link utilization appears moderate, and one egress queue shows rising discards. What should be monitored?

  1. End-to-end QoS trust consistency
  2. Queue drop and utilization monitoring
  3. Weighted deficit round robin
  4. Traffic policing

Explanation

Correct Answer

B:

Per-queue drops can identify congestion hidden by interface averages. Queue counters reveal congestion, egress drops and classes experiencing loss.

Incorrect Answers

A:

QoS treatment must remain coherent across transit devices and trust boundaries. But this does not address the case requirement to find the class experiencing packet loss.

C:

Weighted scheduling distributes egress service among classes according to configured weights. But this does not address the case requirement to find the class experiencing packet loss.

D:

Policing enforces a traffic rate and can drop or remark nonconforming packets. But this does not address the case requirement to find the class experiencing packet loss.

HPE Network Switching Professional (HPE7-A08) Practice Tests

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