ccna security exam 5

ccna security exam 5

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Because IP addresses can be set to change, users often illegal tampering, theft of other people's IP address and MAC address, to reach to hide its illegal purpose of the visit. You can use the ARP command of PIX Firewall to compare the IP address of the internal host with it (1) Link encryption means that the transmitted data is only encrypted at the data link layer on the physical layer, regardless of the source and sink. It is used to protect data between communication nodes. The receiver is each node machine on the transmission path, and the data must be decrypted and re-encrypted in each node machine , in turn, until it reaches the destination. The Sendmail program does the job. After the email arrives at the mail host, it is read to the host by the user via the receiving agent POP protocol . 5.5.3 Establish the order of rules Click the link virus can be divided into source-type virus, intrusion viruses, operating system type virus, the virus shell type 4 species. The source code virus mainly attacks the source program written in high-level language. It inserts itself into the source program of the system,ccna security exam 5, compiles and links with the source program into an executable file, causing the executable file just generated to be directly infected. This virus is relatively rare and difficult to write; intrusive viruses are those viruses that replace some modules or stack areas in normal programs with themselves. They only attack certain specific programs and are highly targeted. Under normal circumstances, they are also difficult to detect. It is also difficult to clean up; operating system viruses use their own parts to add or replace part of the operating system's functions, which is more harmful; shell viruses mainly attach themselves to the beginning or end of normal programs, which is equivalent to adding to normal programs. With a shell, most file viruses fall into this category.

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Latest Cisco CCNA 200-301 Dumps

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