The TOS field in the IP header has meant different things at different times. You have to understand that IP was designed a long time ago and the concept of QoS that we have today is a lot different to what was envisaged at that time.
The original TOS field in IP incorporated two things:
- precedence values
- indication of requested delay, throughput and reliability
More recently, the first 6 bits of the TOS field were re-assigned to DiffServ Code Points.
The terminology CoS is typically used in data link layer headers e.g. the 802.1p field and the CoS field in the ISL header.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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