Type of Service

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The TOS byte in the IPv4 header has had various purposes over the years, and has been defined in different ways by five different RFCs. (RFC 791, RFC 1122, RFC 1349, RFC 2474, and RFC 3168.) The modern definition of the TOS byte is a six-bit Differentiated Services Code Point and a two-bit Explicit Congestion Notification field. For a full history of the TOS byte, see section 22 of RFC 3168.

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