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ccna q&a pdf

    ccna q&a pdf

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  • 1) Destructive Trojan Horse (3) The Trojan will open a special port so that the hacker can contact the Trojan through this port. Use neq and a port to allow or deny access to all ports except the specified end. For example, using neq 10 to allow or deny ports 1 ~ 9 and 11 ~ 65 535 access: Conduit the deny TCP Host 10 Host 192.168.1.1 NEQ NEQ 42 is 209.165.201.2 . ① When the above phenomenon occurs in user poisoning, use the DOS system startup disk to boot into the DOS environment and enter C This function independently records the log of the audit security system and tests the information security response of the control system. 5) Audit Figure 3.2 Block diagram of link layer encryption scheme design Different types of viruses have their own different characteristics, some of them to the infected file based, some with infected systems lead guide area-based. Most viruses are just a small joke, but a few viruses are extremely harmful ( such as the notorious CIH virus ) , which requires us to use appropriate methods to classify viruses to further meet the needs of daily operations. (3) Using online dynamic authorization (Authority) and authentication check (Certificate) to ensure the safety and reliability of the transaction process. Grouping, processing one group at a time. (2) Certificate information and object format. For the interior of the E-mail , the WWW , the FTP and other server can use the pipe (Conduit) such that external access thereof, but must restrict access to them, which prohibits other E-mail , the WWW , the FTP all services except for maximum The configuration method is as follows. (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. ① Run regedit . RSET The encryption key ( public key ) and decryption key ( private key ) used by the public key encryption system are different. Since the encryption key is public, the distribution and management of the key is very simple. For example, for a network with n users, only 2 n keys are needed . The public key encryption system can also easily implement digital signatures. Therefore,ccna q&a pdf, it is most suitable for the needs of e-commerce applications. In practical applications, the public-key encryption system has not completely replaced the symmetric-key encryption system. This is because the public-key encryption system is based on cutting-edge mathematical problems, the calculations are very complex, and its security is higher, but its realization The speed is far behind the symmetric key encryption system. In practical applications, the respective advantages of both can be used, a symmetric encryption system encrypted file, encrypted using the public key encryption system "encrypted file" key ( session key ) , which is a hybrid encryption system, which solves This solves the problem of computing speed and key distribution management. Therefore, public key cryptosystems are usually used to encrypt critical and core confidential data, while symmetric cryptosystems are usually used to encrypt large amounts of data.

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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: Mar 28,2024

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