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Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) · Cisco
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In networking, Quality of Service (QoS) packet classification is commonly performed using the Type of Service (TOS) field in the Layer 3 header of an IP packet. The TOS field includes the Differentiated Services Code Point (DSCP) value, which is used to indicate the priority level or the type of service the packet should receive. This helps network devices to apply appropriate traffic handling policies such as prioritization, bandwidth allocation, and traffic shaping.
"C" is the correct answer: ToS is an eight bit field, comprising of 3-bit IP Precedence (IPP) used for marking and the rest bits unused. This filed has been redefined as 8-bits Differentiated Service (DiffServ) for both IPv4 and IPv6 class fields for backward compatible with IPP
C is correct