Image gallery: Reader favorites -- 10 great free network tools

From sniffing to mapping to monitoring, these utilities perform surprisingly sophisticated tasks

A Nessus test scan on a 24-bit IP subnet with five hosts (a standard home network) took about a half-hour from a wireless machine -- not bad for 20,000-plus tests. The vulnerability report is simple and informative, with a summary section and details available by clicking on the IP address of the desired machine.

A Nessus test scan on a 24-bit IP subnet with five hosts (a standard home network) took about a half-hour from a wireless machine -- not bad for 20,000-plus tests. The vulnerability report is simple and informative, with a summary section and details available by clicking on the IP address of the desired machine.

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