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There are several ways of spreading: General Trojan horse programs include two programs, a client and a server. The client is used by the attacker to remotely control the machine where the Trojan is implanted, and the server program is the Trojan. The attacker will use Trojan horses to attack the user's system and implant the program into the user's computer. Take out the message from the mailbox Table . 5 - . 7 interface command description hardware_speed (ttypl) login system information. Then the hacker will check its open ports for service analysis to see if there are any services that can be used. Most hosts on the Internet provide daily network services such as WWW , E-mail , FTP , Telnet, etc. Normally, the port of Telnet service is 23, etc., the port of WWW service is 80 , and the port of FTP service is 23 . (3) Store and forward 1) Static translation and pipeline commands lOBaseT - Set 10Mb / s Ethernet half-duplex communication \MenuExt , find the right-click menu " Send this picture with QQ MMS " under the key value , as shown in Figure 8.2 . Universal CA runs in the Windows environment, shields various complex operations in the background, the front-end interface is simple, and supports batch operations of requests and certificates, and can automatically revoke expired certificates. (5) the system directory Load.exe file (57 344 bytes ) and the Windows root directory of the Mmc.exe file pieces completely removed, to look at the root of each logical drive Admin.dll file,ccna uk cost, if there is Delete these virus files, and find the file named Readme.eml , and delete it. 1.2 Analysis of the status quo of network security 4.1.1 Principle of Digital Signature (3) The receipt is not repudable, so that every link in sending the receipt cannot shirk its responsibilities. Traditional virus detection and killing are done on the client. However, this method has a fatal disadvantage. If a virus is found on a computer, it means that the virus has infected almost all computers in the organization. An anti-virus gateway should be installed at the connection between the internal computer network and the Internet.

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