Securing Networks Cisco.

This book is an official course on Cisco Network Security Management (MSNS). Its purpose is to teach users how to properly install, configure, operate, manage, and test products designed to protect Cisco networks, in particular the security features offered by Cisco IOS software. It mainly covers issues related to ensuring network protection at the IP level.
The discussion of the practical implementation of security measures is based on the example of real security problems faced by a hypothetical company creating a system to protect its network from scratch. The book will be useful for both network security professionals and anyone interested in this topic.