Book excerpt: Designed for individuals taking the Microsoft Certified Systems Engineer (MCSE) exam, this book provides complete material for the MCSE Internetworking with Microsoft TCP/IP test and shows how to plan, create and administer TCP/IP networks on NT Server 4.0. TCP/IP (Transmission Control Protocol/Internet Protocol) is a set of communications protocols allowing computers of different types to communicate via a common language. TCP/IP forms the basis for the Internet and is increasingly used for corporate networks and internetworks.