Presents all the basic networking technology and terminology relevant to building and maintaining TCP/IP-based networks in a clear and easy-to-understand format. * Demonstrates open source protocol analyzers, including the operation and message sequences for all key data-link, network, and transport layer protocols. * Illustrates how to use a protocol analyzer and common IP software tools to document and troubleshoot a TCP/IP network, including basic addressing and setup, connectivity and communications, name resolution, and fundamental network services. * Discussions of network security include explanations of key vulnerabilities and solutions to potential problems. * Surveys real-time, IP-based protocols and services including Voice over IP (VoIP) and Instant Messaging (IM) applications, with an overview of the protocols, services, and common message sequences involved.