Key Point

While examining documentation about the existing network and discussing it with users, administration staff, and other stakeholders is important, you should also do an audit of the network. The audit can identify items such as the protocols that are running (both those that are known to be running and those that have not been reported), the devices installed and their configurations, the utilization of these devices, and the bandwidth on key WANs).

Many operating systems include commands that display information about device hardware and software. For example, the show version command in the Cisco Internet Operating System (IOS) displays information related to the version of the software and the amount of memory available. Additional tools, such as protocol analyzers, might be necessary to gather other information.

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