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This test measures a different behavior: Capture DSCP values before and after ingress policies for both phone and desktop test flows. It does not establish the target outcome. For the documented fault, the direct acceptance test is: check class-map counters rise for the voice flow and verify queue service with simultaneous bulk traffic.

This test measures a different behavior: Compare conform/exceed counters and confirm out-of-profile packets follow the documented drop or remark action. It does not establish the target outcome. For the documented fault, the direct acceptance test is: check class-map counters rise for the voice flow and verify queue service with simultaneous bulk traffic.

This test measures a different behavior: Under congestion, verify transactional class service stays above its intended share without starving other classes. It does not establish the target outcome. For the documented fault, the direct acceptance test is: check class-map counters rise for the voice flow and verify queue service with simultaneous bulk traffic.

That diagnosis is supported by a different symptom: Desktop file copies consume expedited forwarding because arbitrary endpoint DSCP markings were trusted. Here the recorded observation is: voice traffic enters the default class even though a strict-priority queue exists. The applicable cause is: the QoS class match never identified the voice packets, so the priority action was never used.

That diagnosis is supported by a different symptom: Business transactions lose throughput when the default class consumes the entire congested WAN queue. Here the recorded observation is: voice traffic enters the default class even though a strict-priority queue exists. The applicable cause is: the QoS class match never identified the voice packets, so the priority action was never used.

That diagnosis is supported by a different symptom: Guest bursts continue consuming uplink capacity despite a configured threshold in an unrelated class. Here the recorded observation is: voice traffic enters the default class even though a strict-priority queue exists. The applicable cause is: the QoS class match never identified the voice packets, so the priority action was never used.

That control reduces a separate risk: The policer does not match the guest class or is applied at the wrong traffic direction. For the described design, the recurring risk arises from: the QoS class match never identified the voice packets, so the priority action was never used. The specific required safeguard is: audit classification at trust boundaries and check marks after applications change their endpoints.

That control reduces a separate risk: Ingress marking trust was extended to an untrusted desktop instead of validated voice endpoints. For the described design, the recurring risk arises from: the QoS class match never identified the voice packets, so the priority action was never used. The specific required safeguard is: audit classification at trust boundaries and check marks after applications change their endpoints.

That control reduces a separate risk: The class has no effective bandwidth reservation or policy is not active on the egress interface. For the described design, the recurring risk arises from: the QoS class match never identified the voice packets, so the priority action was never used. The specific required safeguard is: audit classification at trust boundaries and check marks after applications change their endpoints.

Using output shaping toward the contracted rate to buffer bursts rather than relying on carrier discard would not define a defensible QoS trust boundary that accepts trusted phone marking but reclassifies untrusted host traffic.

Matching trusted voice traffic into an appropriate QoS class and applying the intended service policy at the congested interface would not define a defensible QoS trust boundary that accepts trusted phone marking but reclassifies untrusted host traffic.

Interpreting the class bandwidth share and applying suitable class-based weighted fair queuing for the intended minimum service would not define a defensible QoS trust boundary that accepts trusted phone marking but reclassifies untrusted host traffic.

This test measures a different behavior: Observe local shaping queue depth and lowered carrier drop counters under controlled offered load. It does not establish the target outcome. For the documented fault, the direct acceptance test is: capture DSCP values before and after ingress policies for both phone and desktop test flows.

This test measures a different behavior: Check class-map counters rise for the voice flow and verify queue service with simultaneous bulk traffic. It does not establish the target outcome. For the documented fault, the direct acceptance test is: capture DSCP values before and after ingress policies for both phone and desktop test flows.

This test measures a different behavior: Under congestion, verify transactional class service stays above its intended share without starving other classes. It does not establish the target outcome. For the documented fault, the direct acceptance test is: capture DSCP values before and after ingress policies for both phone and desktop test flows.

That diagnosis is supported by a different symptom: Provider discard counters increase during bursts even though average utilization appears within contract. Here the recorded observation is: desktop file copies consume expedited forwarding because arbitrary endpoint DSCP markings were trusted. The applicable cause is: ingress marking trust was extended to an untrusted desktop instead of validated voice endpoints.

That diagnosis is supported by a different symptom: Business transactions lose throughput when the default class consumes the entire congested WAN queue. Here the recorded observation is: desktop file copies consume expedited forwarding because arbitrary endpoint DSCP markings were trusted. The applicable cause is: ingress marking trust was extended to an untrusted desktop instead of validated voice endpoints.

That diagnosis is supported by a different symptom: Voice traffic enters the default class even though a strict-priority queue exists. Here the recorded observation is: desktop file copies consume expedited forwarding because arbitrary endpoint DSCP markings were trusted. The applicable cause is: ingress marking trust was extended to an untrusted desktop instead of validated voice endpoints.

That control reduces a separate risk: Unshaped output bursts exceed the provider's committed service rate. For the described design, the recurring risk arises from: ingress marking trust was extended to an untrusted desktop instead of validated voice endpoints. The specific required safeguard is: periodically test QoS markings from untrusted access devices and enforce managed phone classification.

That control reduces a separate risk: The class has no effective bandwidth reservation or policy is not active on the egress interface. For the described design, the recurring risk arises from: ingress marking trust was extended to an untrusted desktop instead of validated voice endpoints. The specific required safeguard is: periodically test QoS markings from untrusted access devices and enforce managed phone classification.

That control reduces a separate risk: The QoS class match never identified the voice packets, so the priority action was never used. For the described design, the recurring risk arises from: ingress marking trust was extended to an untrusted desktop instead of validated voice endpoints. The specific required safeguard is: periodically test QoS markings from untrusted access devices and enforce managed phone classification.

The needed correction is to use output shaping toward the contracted rate to buffer bursts rather than relying on carrier discard.

Applying a suitable policer with explicit conform/exceed actions to the guest class at the intended interface would not meet the need for output shaping toward the contracted rate to buffer bursts rather than relying on carrier discard.

Interpreting the class bandwidth share and applying suitable class-based weighted fair queuing for the intended minimum service would not meet the need for output shaping toward the contracted rate to buffer bursts rather than relying on carrier discard.

This test measures a different behavior: Under congestion, verify transactional class service stays above its intended share without starving other classes. It does not establish the target outcome. For the documented fault, the direct acceptance test is: observe local shaping queue depth and lowered carrier drop counters under controlled offered load.

This test measures a different behavior: Check queue-specific early-drop counters and congestion response while maintaining the required priority voice treatment. It does not establish the target outcome. For the documented fault, the direct acceptance test is: observe local shaping queue depth and lowered carrier drop counters under controlled offered load.

This test measures a different behavior: Compare conform/exceed counters and confirm out-of-profile packets follow the documented drop or remark action. It does not establish the target outcome. For the documented fault, the direct acceptance test is: observe local shaping queue depth and lowered carrier drop counters under controlled offered load.

That diagnosis is supported by a different symptom: Bulk TCP sessions synchronize large retransmission bursts after the queue fills entirely. Here the recorded observation is: provider discard counters increase during bursts even though average utilization appears within contract. The applicable cause is: unshaped output bursts exceed the provider's committed service rate.

That diagnosis is supported by a different symptom: Business transactions lose throughput when the default class consumes the entire congested WAN queue. Here the recorded observation is: provider discard counters increase during bursts even though average utilization appears within contract. The applicable cause is: unshaped output bursts exceed the provider's committed service rate.

That diagnosis is supported by a different symptom: Guest bursts continue consuming uplink capacity despite a configured threshold in an unrelated class. Here the recorded observation is: provider discard counters increase during bursts even though average utilization appears within contract. The applicable cause is: unshaped output bursts exceed the provider's committed service rate.

That control reduces a separate risk: The class has no effective bandwidth reservation or policy is not active on the egress interface. For the described design, the recurring risk arises from: unshaped output bursts exceed the provider's committed service rate. The specific required safeguard is: review shaper bandwidth when circuits or classes change, using queue delay and drop evidence.

That control reduces a separate risk: The queue uses only full-buffer tail dropping, not the planned early congestion signal. For the described design, the recurring risk arises from: unshaped output bursts exceed the provider's committed service rate. The specific required safeguard is: review shaper bandwidth when circuits or classes change, using queue delay and drop evidence.

That control reduces a separate risk: The policer does not match the guest class or is applied at the wrong traffic direction. For the described design, the recurring risk arises from: unshaped output bursts exceed the provider's committed service rate. The specific required safeguard is: review shaper bandwidth when circuits or classes change, using queue delay and drop evidence.