CHAPTER 25
LOCAL AREA NETWORKS
Gary C. Kessler and N. Todd Pritsky
25.2 POLICY AND PROCEDURE ISSUES
25.4.1 Sniffers and Broadcast LANs
25.4.2 Attacks on the Physical Plant
25.4.3 Modems, Dial-up Servers, and Telephone Lines
25.5 NETWORK OPERATING SYSTEM ISSUES
25.1 INTRODUCTION.
This chapter discusses generic issues surrounding local area network (LAN) security. Securing the LAN is essential to securing the Internet because LANs are where most of the attackers, victims, clients, servers, firewalls, routers, and other devices reside. Compromised LAN systems on the Internet open other nodes on that local network to attack and put other systems at risk on the Internet as a whole. Many of the general issues mentioned herein are described in more specific terms in other chapters of this Handbook, such as Chapters 15, 22, 23, and 47 in particular.
25.2 POLICY AND PROCEDURE ISSUES.
Twenty years ago, all users had accounts on a shared mainframe or minicomputer. A single system manager was responsible for security, backup, disaster recovery, account management, policies, and all other related issues. Today all users are system managers, and, in many cases, individuals have responsibility for several systems. Since the vulnerability of a single computer can compromise the entire ...
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