Description: opened by the server port is a potential communication channel, which is a channel invasion. The target computer port scan be useful information for a port scan many ways, it can be manually scan also use port scanning software. Through the use of scanners remote TCP/IP ports of different services, and to record the answers given by the target, this method can collect a lot of the target host of useful information, such as whether the remote system support anonymous landing, and whether there can write the FTP directory, whether to open the TELNET services and HTTPD services.
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