4.1. Monitoring the Network

The basics of network monitoring were introduced earlier (in Chapter 2). This chapter picks up that topic and examines more of the specifics and details of network monitoring.

Your network is vulnerable to all sorts of attacks and penetration efforts. Network-monitoring techniques help you track what is happening in your network. Monitoring can occur in real time (for example, when using a network sniffer) or by following events using log files and security systems (a task made simpler by using an intrusion detection system [IDS]).

More than likely, the building you occupy has a perimeter security system. This system might not keep a determined burglar from breaking in, but it will keep out most people. Most office ...

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