chapter 9 ccna 3

chapter 9 ccna 3

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When the virus program runs for the first time, the virus will periodically detect each driver at a certain time interval (5) The sender A sends the encrypted information E and the digital envelope DE to the recipient B together . There are some special security vulnerabilities in the implementation of Java in NetScape 2.0 , such as the ability to arbitrarily execute machine instructions , the mutual competitiveness of Java applets, and the ability to establish connections with any host. SMTP design is based on the following communication model: in response to user mail requests, send SMTP , and establish a two-way transmission channel between receiving SMTP . The receiving SMTP can be the ultimate recipient or an intermediate sender. The SMTP command is issued by the sending SMTP , received by the receiving SMTP , and the response is transmitted in the reverse direction. Among the Web sites, more than 1/3 of the Web sites are protected by some form of firewall. This is the most stringent and secure way to prevent hackers . Any critical server is recommended to be placed Behind the firewall. Any off access key server must be through a proxy server, although this reduces the ability to interact with the server,chapter 9 ccna 3, but for safety, this sacrifice is worth it. China's information security research experience of the confidentiality of communications and computer data protection, two stages of development, is now entering the network believe information security research stage. Although the secure operating system and multi-level security database have been developed through learning, absorbing, and digesting the principles of TCSEC , because the system security kernel is controlled by people and foreign products are constantly updated and upgraded, the enhancement of security functions based on specific products The results are difficult to guarantee that there are no loopholes, and it is difficult to be promoted and applied.

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