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Figure 5.9 Firewall configuration } (3) The Trojan will open a special port so that the hacker can contact the Trojan through this port. 5.1.2 Purpose and function of network firewall (8) Be sure to back up the hard disk boot area and the main boot sector, and frequently back up important data to take precautions. (5) The validity period of the certificate. The current universal certificate generally adopts the UTC time format, and its timing range is 1950 ~ The insecurity of the operating system software itself, as well as the "vulnerabilities" left by the negligence or inadequate consideration of the system design , have left many hidden dangers to network security. 5. Easy to use and powerful interface ethernet1 auto (6) Physical protection and safety management. By formulating standards, management methods and regulations, strengthen the standardized management of physical entities and information systems, and reduce the negative impact of ineffective human management factors. The advertisement information of a new webpage is created under Explore\MenuExt , and it appears in the right-click menu of IE . Use the following methods to solve: Application layer Key (Key) : Key is the key data encryption and decryption algorithms involved. Without it, plaintext cannot become ciphertext, and ciphertext cannot become plaintext. (2) Ensure the integrity of data through digital signatures. (8) The stealth of various attack techniques is enhanced, which cannot be identified by conventional means. Common public key algorithms are listed below. 2) SET certification two -dynamic certification If the user does not have a DOS boot disk at hand , there is another way to enter the safe mode after starting the system, then search the C drive, find the Msblast.exe file, delete the file directly after finding it, and then start the computer normally again. (2) Master the configuration of the FTP service client. This is the simplest attack method. The attacker sends a large number of ICMP packets of super-large bytes to the attacked by Ping . In many operating systems ICMP packet default size is 64KB , of course, the user can also use this command to send large packets of data bytes,cisco certification quora, but sent for packets that exceed 65 535B will cause the resulting recombinant packet server memory allocation errors, A buffer overflow occurs, which may cause the server to crash and deny service in severe cases.

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