A byte in the IP header that defines the Type of Service that should be given to that packet. Two types are implemented: IP Precedence bits (mostly in Cisco equipment) or DiffServ (IETF standard). When used for IP Precedence, utilizes bits 0-2 to signify 8 priority values 0-7. When used as DiffServ Code Point Description (DSCP), utilizes only 6 out of the 8 bits. IP Precedence and DiffServ are prioritizing methods for IP traffic going through the network. By setting the Type of Service (ToS) bits in accordance with network policy, end‑to‑end QoS can be achieved in a heterogeneous environment.