Managing Cisco Network Security, Second Edition
A completely updated sourcebook on Cisco Security Management.
TABLE OF CONTENTS Managing Cisco Network Security, Second Edition
Chapter 1: Introduction to IP Network Security
Introduction
This book is intended to help people implement IP network security in a Cisco environment. It will provide the language, architectural framework, technical insight, technical configuration, and practical advice to ensure best practice security implementation. Successfully digesting the material presented in this book will allow you to protect your environment and client services using a wide array of Cisco security technologies and equipment.
What Role Does Security Play in a Network?
This book is about IP network security. Though you probably already know something about networking, we'll go over some of the language to be sure we are all working from the same concepts. Let's begin by discussing what we are trying to accomplish with IP network security.
Goals
The goals of security usually boil down to three things, represented by the acronym CIA:
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Confidentiality Confidentiality protects sensitive information from unauthorized disclosure or intelligible interception. Information should only be seen by the intended parties in a conversation, not by eavesdroppers.
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Integrity Integrity ensures that information or software is complete, accurate, and authentic (in other words, it isn't altered without authorization). We want to ensure mechanisms are in place to protect against accidental or malicious changes, and may wish to produce documented trails of which communications have occurred.
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Availability Availability ensures that information and services are accessible and functional when needed and authorized. There is a related concept of trust. The formal definition of trust concerns the extent to which someone who relies...
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