Which IPv4 header field is responsible for defining the priority of the packet?

Question:
Which IPv4 header field is responsible for defining the priority of the packet?

• flow label
• flags
• differentiated services
• traffic class

Explanation: Differentiated services (DiffServ) is an IPv4 header field that is used to define the priority of each packet. The first 6 bits identify the value that is used by the QoS mechanism, and the last 2 bits identify the value that can be used to avoid packet dropping during network congestion. Traffic class is an IPv6 header field that is equivalent to the IPv4 differentiated services (DiffServ) field. Flow label is also an IPv6 header field that can be used to tell routers and switches to keep the same path for the packet flow to avoid packet reordering. Flags is an IPv4 header field that identifies how the packet is fragmented.

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