Gilbert (4-Degree Consulting, Macon, Georgia, USA) Held 
The ABCs of TCP/IP [PDF ebook] 

Advances in networking and communications hardware based upon the TCP/IP protocol suite are opening up a new range of technologies with the potential to contribute considerably to our daily lives. The ABCs of TCP/IP is a comprehensive reference on the TCP/IP protocol suite for professionals that provides an overview of the suite and details its key components. It addresses virtual private networks, IP telephony and voice gateways, and IPSec and examines the manner by which various protocols and applications operate. Coverage also includes security techniques, routing, network design constraints, testing methods, troubleshooting, management issues, and emerging applications.