Glossary: TCP/IP in Depth, Part 1
DSCP (Differentiated Services Code Point)
Also written: traffic marking
The left 6 bits of the IPv4 tos byte, which mark a packet's priority class so routers know which packets to serve first. Voice packets get DSCP 46, which makes the tos byte 0xb8.
Where the book teaches it
Related terms
DSCP classestos (type of service)ECN (Explicit Congestion Notification)traffic class