Brian Komar 
Sams Teach Yourself TCP/IP Networking in 21 Days [EPUB ebook] 

This thorough, step-by-step guide to TCP/IP walks network administrators through the core principles and common practices associated with TCP/IP. The book begins by explaining basic networking concepts such as the OSI model and IP addressing and quickly moves toward more complex subjects, such as encryption, subnetting, and IPv6. This edition is updated to include the latest implementation trends and administration methods. Each chapter concludes with a Test Your Knowledge quiz and numerous exercises so that readers can verify that they understand the topics discussed before progressing to more complex topics.