Bruce Davie works at Cisco Systems, Inc., where he is a Cisco Fellow. He leads a group working on the development of MPLS and QoS capabilities for IP networks. He is the author of numerous journal articles and RFCs and two prior books on computer networks. Yakov Rekhter also works at Cisco Systems, Inc., where he is a Cisco Fellow. He is one of the leading designers of Tag Switching, BGP/MPLS VPNs, and MPLS traffic engineering. He is also one of the leading designers of Border Gateway Protocol (BGP). He is the author of many RFCs, as well as numerous presentations and articles on TCP/IP and the Internet.