Which of the following is not a QoS PHB?
- Best Effort (BE)
- Class Selector (CS)
- Default Forwarding (DF)
- Assured Forwarding (AF)
- Expedited Forwarding (EF)
Explanation: Four PHBs have been defined and characterized for general use:
- Class Selector (CS) PHB: The first 3 bits of the DSCP field are used as CS bits; the class selector bits make DSCP backward compatible with IP Precedence because IP Precedence uses the same 3 bits to determine class.
- Default Forwarding (DF) PHB: Used for best-effort service.
- Assured Forwarding (AF) PHB: Used for guaranteed bandwidth service.
- Expedited Forwarding (EF) PHB: Used for low-delay service.
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