No other book on the market covers Cisco firewall hardware to the extent this one does. This book deals specifically with the Cisco Secure PIX 506, 515, 520, 525 and 535 units. The authors show how to configure address translation, accounting, logging, IPSec (Virtual Private Networks–VPNs–particularly), authentication, and SNMP and DHCP services. The appendixes provide helpful references, including configuring PIX intrusion detection features, SNMP management support, and Secure Shell Protocol (SSH) connection.”]
Source: https://www.amazon.co.uk/exec/obidos/ASIN/1587050358/helpnetsecuri-21