What is the maximum number of forwarding subclasses a forwarding class can have?

Question

Options

• A3
• B64
• C72
• D16
• E56

• A
  8% (2)
• D
  4% (1)
• E
  88% (21)

Explanation

In Juniper Networks Class of Service (CoS), a single forwarding class can have a maximum of 56 forwarding subclasses, allowing granular traffic differentiation within a single class. Option E is correct because this limit stems from the CoS architecture's internal queue and scheduling constraints on supported platforms.

The distractors reflect common CoS values that are easy to confuse: 16 (D) is the maximum number of forwarding classes you can configure - a related but distinct limit; 64 (B) is the total number of DSCP codepoint values, not subclasses per class; 72 (C) has no standard significance in Juniper CoS and serves as a pure distractor; 3 (A) may evoke the three loss-priority levels (low, medium-low, high), which is a different concept entirely.

Memory tip: Think "56 subclasses, 16 classes" - the subclass limit (56) is larger than the class limit (16), just as subdivisions outnumber the groups they belong to. If you remember 16 as the class ceiling, 56 is the next distinct number in Juniper CoS that anchors the subclass ceiling.

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