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In short The Type Of Service bits are a set of four-bit flags in the IP header.

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Posted by HamidAliKhan

Priority is encoded into the IP field of the packet. Includes a precedence number from 0 to 7 plus bits for Low Delay, High Reliability, and High Throughput requirements. Because this is set by the sender, the chance for abuse and nonstandard precedence selection is high.

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Posted by yogendra

he Type Of Service (TOS) bits are a set of four-bit flags in the IP header. When any one of these bit flags is set, routers may handle the datagram differently than datagrams with no TOS bits set. Each of the four bits has a different purpose and only one of the TOS bits may be set at any time, so combinations are not allowed. The bit flags are called Type of Service bits because they enable the application transmitting the data to tell the network the type of network service it requires.

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Posted by sagitraz