ccna ipsec

ccna ipsec

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Unprivileged mode To ensure information security, the most fundamental thing is to ensure that the basic features of information security play a role. Therefore, the following first introduces the five major characteristics of information security . shutdown The difference with ordinary letters is that ordinary letters must choose the closest route, while emails always choose the most empty (3) Protocol Driver (Protocol the Drivers) . It can be said that almost all operating systems are not perfect, and there are always security vulnerabilities. For example in Windows (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. 2.1.1 Operating system security concept Nowadays, there are more and more traps on the Internet. If you are not careful, you may be "ambushed". As the most popular browser software, IE has also become a part of the Internet trap. (6) Various foreign intelligence and spy personnel will increasingly collect intelligence and steal information through information network channels. According to the ability of the virus to destroy it can be divided into the following categories. (2) Password cracking of FTP service. (4) Capture screen: view the screen of the monitored terminal ( equivalent to executing "control commands" → "capture screen " → " view screen " command in the command console ) . (2) E-mail system (2) It can effectively isolate multiple network segments in the network and prevent the problem of one network segment from spreading to another network segment. G_Client.exe : Monitoring terminal execution program, used to monitor remote computers and configure server programs. (4) very dangerous type: this type of virus removal programs, destroy data,ccna ipsec, clear the system memory area and operating systems weight information wanted. (3) Store and forward In 1976 , in order to solve the key management problem , Dittie and Hellman proposed a key exchange protocol in their foundational work " New Directions in Cryptography ", which allows the two parties to exchange information on insecure media. , The secret key is transmitted securely. On the basis of this new idea, asymmetric key cryptosystem, namely public key cryptosystem, soon appeared. In the public key system, the encryption key is different from the decryption key. The encryption key is made public and anyone can use it; the decryption key is only known by the decryptor. They are called public key and secret key respectively. In so far all public key cryptography, the RS A system is best known, the most used one.

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