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Intranet high Private network external_if_name security_level For example: the method of using random numbers only increases the difficulty of these analyses, but it seriously increases the time of encryption and decryption,ccna discount, and these analysis techniques can also decipher this method of using random numbers. When using FTP , it should be noted that whether to log in to the FTP server in PASV or PORT mode , the choice is on the FTP client. ( XM ) d = X d × M d mod n (1) Observe the basic structure of the firewall and describe the various interfaces and functions of the firewall. WWW server and E-mail server etc. ) are placed in the surrounding network, which also reduces the security risk of the internal network. The structure of this firewall is shown in Figure 5.5 . This structure is in line with the five requirements we put forward and should be the safest precaution mode. Figure 5.4 Subnet filtering firewall structure 3) Ensure data security Sometimes, because there is not enough space, a buffer overflow occurs. Artificial overflow is a certain attempt. Hackers write a string that exceeds the length of the buffer and then implant it in the buffer. Buffer overflow has become the main method of remote attacks. The reason is that buffer overflow vulnerabilities give hackers everything that hackers want: implant and execute attack code. Was implanted into the attack code has certain rights to run the program a buffer overflow vulnerability, resulting in control of the attacked host. Most of the cause of buffer overflow is that the program does not carefully check the parameters entered by the user.

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Latest Cisco CCNA 200-301 Dumps

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