This book follows a few typographical and stylistic conventions:

  • New terms are set in italic the first time they are introduced.

  • Whenever possible, we reference the Common Vulnerabilities and Exposures (CVE) database to allow you to obtain additional information about the vulnerabilitiesfor example,

  • Commands, file locations, variables, and other "computer language" instructions are set in a monospace fontfor example, GET, AllowHosts, and access-list.

  • We also use italic to indicate the use of a placeholder in the text. For example, in the following IOS command, you should substitute "gateway IP" with an actual IP address: ip route gateway IP.

  • When a line from command, code, or log listing is too long to fit on the page, we use the code-continuation character to indicate that we wrapped the line that did not originally have a line break. Here's an example:

    [View full width]

    Jan 28 03:15:26 [] 265114: %SEC-6-IPACCESSLOGP: list 105 denied tcp 172.30.128 .12(1947) ->, 1 packet

  • We often use sidebars to describe our own experiences and to present illustrative examples. Therefore, the text in most sidebars is worded in a first person voice. Here's an example:

    At Least Lock the (Screen) Door

    I once encountered a network without a screened subnet or a DMZ. The DNS server resided on the internal network, which was a hub-based environment. When an attacker compromised the DNS server, he installed a sniffer and was able to glean internal passwords. If the DNS server had been on a switched screened subnet, the attacker's ability to sniff passwords would have been greatly inhibited.

  • Finally, within each chapter, you will encounter several Notes and Tips:


    Tips are used to highlight shortcuts, convenient techniques, or tools that can make a task easier. Tips also sometimes provide recommendations on best practices you should follow.


    Notes provide additional background information about a topic being described, beyond what is given in the chapter text. Often, notes are used to provide references to places you can find more information about a particular topic.

    Inside Network Perimeter Security
    Inside Network Perimeter Security (2nd Edition)
    ISBN: 0672327376
    EAN: 2147483647
    Year: 2005
    Pages: 230

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