Forwarding subclasses are only relevant to, and are therefore applied within the context of, a _____________policy.

Question

Options

• Anetwork
• Bscheduling
• Cslope
• DSAP-ingress
• Enetwork-queue

• A
  3% (1)
• B
  3% (1)
• D
  93% (37)
• E
  3% (1)

Explanation

SAP-ingress is correct because, in Nokia SR OS QoS architecture, forwarding subclasses are a feature exclusively available within SAP-ingress policies, where they allow granular sub-classification of traffic within a forwarding class to direct flows to specific queues at the customer-facing service access point.

Why the distractors are wrong:

• A. Network - Network policies govern traffic on network-facing (router-to-router) interfaces and do not support the forwarding subclass construct.
• B. Scheduling - Scheduling policies control how queues are serviced (priority, weights, rates) but do not classify traffic into subclasses.
• C. Slope - Slope policies configure WRED (Weighted Random Early Detection) congestion avoidance parameters, unrelated to traffic sub-classification.
• E. Network-queue - Network-queue policies manage queuing behavior on network interfaces, not SAP-level ingress classification.

Memory tip: Associate "subclass" with "SAP" - both start with S, and subclasses exist because the SAP is where customer traffic first enters the service, requiring the most granular classification before queuing decisions are made.

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