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Computer Networks 
Communication Networks (S. Hekmat) Understanding Optical Communications
Introduction to Networking and Data Communications (E. Blanchard) [Mirror]
Introduction to Networking Technologies High-Performance Networking Unleashed [Mirror]
Computer Networking: A Top-Down Approach Featuring the Internet
Computer Networks (H. Bischof) Computer Networks and Internets (D.E. Comer)
Understanding Networking Technologies The Fiber Optic Data Communications
Internetworking Multimedia (J. Crowcroft, M. Handley, I. Wakeman)
The Internet Companion - A Beginner's Guide to Global Networking [Mirror]