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When a Trojan infects the system, it typically opens _________ port.
a high-numbered
the telnet
the FTP
a low-numbered
Commercial software is thorough and gets updated frequently, and it can help keep systems clean. However, freely available tools may prove to be malicious themselves. There are a lot of such fake software on the Internet. Deleting infected files is not enough: registry entries, programs installed by the Trojan, and closing certain ports may be also required.
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