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  • 4. Destructive (3) Class B security level: Class B security level is divided into three categories : B1 , B2 , and B3 . Class B system has a mandatory protection function, which means that if the user is not connected to the security level, the system will not allow the user to access the object. After the data is encrypted, the transmitted information can still be obtained through monitoring, but the display is garbled. The disadvantage of using encryption technology is that it affects the data transmission speed and using a weak encryption technology is easier to break. System administrators and users need to make a compromise between network speed and security. When encrypting information m , first divide m into equal-length data blocks m 1 , m 2 , ...,ccna license, m i , block length s , where 2 s ≤ n , s E-mail is probably one of the most common way in which information is the Internet, e-mail and security issues are also more increasingly important. In order to ensure the security of important and confidential emails, it is best to encrypt some important emails. Take Foxmail as an example, you can use the software's built-in encryption and digital signature to achieve the goal. *.exe) . Windows and other operating systems cause damage. For example: In the early stage of the virus, there is a Denzuk virus 360KB work well on a disk, it will not cause any damage, but later in the high-density floppy disk was able to cause a large number of data loss. Each layer of NDIS drivers and the relationship between them are shown in Figure 3.1 . In the free storage object space of the trusted computing base of the computer output information system, all authorizations for the information contained in the object are revoked before an object is initially designated and allocated. When the subject gains access to a released object, the current subject cannot obtain any information generated by the original subject’s activities. Encryption system: composed of algorithms and all possible plaintext, ciphertext and keys. By making the address space of the data segment of the attacked program non-executable, it is impossible for hackers to execute the code of the attacked program's input buffer. This technique is called non-execution buffer technology. (7) Authenticator : It is another part sent with the ticket when the client authenticates to the server . Its function is to prove that the user who sent the ticket is the user who owns the ticket , that is, to prevent replay attacks. Its main content is a timestamp ( the time when the client sends the Ticket ) , which has its complete ASN.1 definition in rfc 1510 . (1) When the virus is running, it will copy itself to the Window directory and name it Msblast.exe . 2) Identification (3) Access control. Access control characterizes the ability of the subject to operate with the specified authority over the object. The content of access control includes: personnel restrictions, access authority settings, data identification, control types and risk analysis, etc. It is an important aspect of internal network information security. Cryptography is one of the most effective technologies for network security. Encrypted network can not only prevent unauthorized users from eavesdropping and accessing the network, but also one of the effective methods to deal with malicious software. (1) propagate through a non-removable computer hardware device ( i.e., using a dedicated ASIC chip and hard disk transfer multicast ) . Although this virus is very rare, it is extremely destructive, and there is currently no better detection method. If the certificate is lost due to virus, computer reinstallation, etc., you can restore the backed-up client certificate ( note that you must enter the backup password when importing ) , which can be divided into the following two situations. In Netscape Communicator in the recovery method is complex certificate: Click the "Security" button, select "certificate" in the "your" item, click "Enter Certificate" button; in Internet Explorer 6.0 way to restore the certificate is: execution The " Internet Options " command under the "Tools" menu , open the "Content" tab in the pop-up dialog box , click the "Certificate" button, the "Certificate" dialog box pops up, open the "Personal" tab, click "Import "Button. But the safest way is to terminate the online banking service and reopen the account.

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Exam Code: 200-301

Certification Provider: Cisco

Certification Exam Name:Cisco CCNA

Update Date: Feb 28,2021

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