com and in the Cisco security
products documentation.
The book is divided into five parts, mapping Cisco security technologies and solutions into five key elements.
Part I, "Perimeter Security": This element provides the means to control access to critical network
applications, data, and services so that only legitimate users and information can pass through the network.
Part I includes the following chapters:
Chapter 1, "Overview of Network Security," introduces principles of network security, security models, and
a basic overview of security standards, policies, and the network security framework.
Chapter 2, "Access Control," describes the capability to perform traffic filtering using access control lists
(ACL). It covers numerous types of ACL, such as standard and extended ACL, Lock-and-key, Reflexive,
Time-based, Receive ACL, Infrastructure ACL, and Transit ACL. The chapter addresses traffic filtering
based on RFC standards and best common practices.
Chapter 3, "Device Security," covers some of the most common techniques used for device hardening and
securing management access for routers, firewall appliances, and the intrusion prevention system (IPS)
appliance.
Chapter 4, "Security Features on Switches," provides a comprehensive set of security features available on
the switches.
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