ccna demo question paper

ccna demo question paper

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(3) The electronic document received by the recipient has not been tampered with during transmission,ccna demo question paper, maintaining the integrity of the data, because any changes to the electronic signature after signing can be discovered. 1.7 Network information security mechanism According to the principle of the TCP/IP protocol, when the client wants to communicate with the server, it will be contacted by request / confirmation. For example, when a user logs on to the server, the user first sends information and asks the server for confirmation, and the server responds. Code implantation and buffer overflow do not have to be completed in one action. The attacker can put code in a buffer, and cannot overflow the buffer. Then the attacker transfers the pointer of the program by overflowing another buffer. This method is generally used to solve the problem that the buffer available for overflow is not large enough ( cannot put all the code ) . If an attacker tries to use already resident code instead of implanting code from outside, they usually have to pass the code as a parameter. For example , part of the code segment in the library function will execute xexc(something) , where something is the parameter. An attacker using a buffer overflow parameter change program and make the program with another pointer to a buffer overflow libc specific sections of code in.

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