Whois queries are used to determine the IP address ranges associated with clients. A whois query can be run on most UNIX environments. In a Windows environment, the tools such as WsPingPro and Sam Spade can be used to perform whois queries. Whois queries can also be executed over the Web from www.arin.net and www.networksolutions.com.

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The various modes of system security testing are as follows: 1. Remote network: This mode attempts to simulate an attack launched over the Internet. The primary defenses that must be

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