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    which cisco certification is best

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  • (5) Discard and not record. Usually a large number of communication calls discarded and recorded by the firewall on the network will quickly fill up the log. Create a rule to discard or reject this call without recording it. At present, for dynamically transmitted information,which cisco certification is best, most of the methods used by many protocols to ensure the integrity of the information are the methods of receiving errors and retransmitting and discarding subsequent packets. However, hacker attacks can change the contents of the information packets, so effective measures should be taken to complete the information. Sexual control. The RSA algorithm can be used for both data encryption and digital signature. The theoretical basis of RSA is that it is relatively simple to find two large prime numbers, but the process of unraveling their multiplication and integration is extremely difficult. In the RSA algorithm, it contains two keys, The weakness of the DES algorithm is that it cannot provide sufficient security because its key capacity is only 56 bits. For this reason, later proposed triple DES or 3DES system, three different key data block three ( or two ) plus dense, three times faster than the ordinary method of encryption. Its strength is about the same as the strength of a 112 -bit key. Example: Choose p = 3 , q = 11 , then n = 33 , φ ( n ) = ( p - 1) × ( q - 1) = 20 . Choose d = 13 ( a number greater than p and q , and less than φ ( n ) , and relatively prime to φ ( n ) , that is, the greatest common divisor is 1) , through e × 13 = 1 mod 20 , calculate e = 17 ( large in p and q, And φ ( n ) are relatively prime ) . This virus reduces system resources and may eventually cause the system to slow down and finally crash; it changes security settings, shares the hard disk of the infected machine in the network, and causes leaks; it continuously sends poisonous emails. Unlike the red code and the blue code, the virus not only targets the server, but also infects and destroys the Windows 9X system. permit Traditional cryptanalysis techniques are mainly based on exhaustive search. It takes several people / years to decipher DES . Network layer or application layer CIH virus infects Windows executable files (EXE) , it does not infect Word and Excel documents. CIH infection (1) Master the use and management of software. That is, the handwritten signature or seal is used as an image, scanned by light and stored in the database after photoelectric conversion. When verifying the person’s handwritten signature or stamp, it is also input by light scanning, and the corresponding image in the original database is called out. Use the mathematical calculation method of pattern recognition to compare the two to confirm the authenticity of the signature or seal. This method has been used in bank accounting counters, but due to the need for large-capacity database storage and the difference of each handwritten signature and stamp, it proves to be impractical, and this method is not suitable for transmission on the Internet.

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Latest Cisco CCNA 200-301 Dumps

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Latest Cisco CCNA 200-301 Exam Information

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Exam Code: 200-301

Certification Provider: Cisco

Certification Exam Name:Cisco CCNA

Update Date: Apr 20,2021

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