Books:
Computer Networking: A Top-Down Approach Featuring the Internet
Authors: James F.Kurose, Keith W.Ross
Publisher: Addison Wesley
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Communication Networking: An Analytical Approach
Authors: Anurag Kumar, D. Manjunath, Joy Kuri
Publisher: Morgan Kaufmann
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CISCO: Designing Network Security
Author: Merike Kaeo
Publisher: Cisco Press
Certified Wireless Network Administrator
Aurthors: Tom carpenter, Joel Barrett
Publisher: McGraw Hill
Understanding LINUX Network Internals
Author: Christain Benvenuti
Publisher: O'Reilly Media, Inc.
Cisco Router Configuration
Author: Allan Leinwand, Bruce Pinsky, Mark Culpepper