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  • (2) All access that is not prohibited is allowed. Based on this criterion, the firewall opens all information flows and then blocks harmful services one by one. This method constitutes a flexible application environment, but it is difficult to provide reliable security protection, especially when the protected network range increases. When encrypting information m ,is ccna certification hard, first divide m into equal-length data blocks m 1 , m 2 , ..., m i , block length s , where 2 s ≤ n , s ( Easy to expand ) 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. The first 5 chapters firewall technology and configuration Table . 5 - 14 Conduit Command Description (6) Use Proxy : Use a proxy to prevent others from discovering your real IP . If you want to use a proxy, select the check box, click the Define button, and set the proxy's IP and port. If you want a user name and password, enter it, otherwise don't enter it. No proxy is used here. (5) Packet filtering: The device selectively controls and operates data flows ( packets ) entering and leaving the network . It is usually to filter packets from the external network to the internal network. Users can set a series of rules to specify which types of data packets are allowed ( or denied ) to flow into ( or flow out ) the internal network. The data encryption process is the process of transforming the original digital data ( plaintext ) into digital data ( ciphertext ) completely different from the plaintext according to the encryption algorithm through the encryption system . The main advantages of symmetric encryption algorithm are fast encryption and decryption speed, high encryption strength, and open algorithm, but its biggest disadvantage is that it is difficult to realize the secret distribution of keys. Key management is complicated and impossible to complete when there are a large number of users. Functions such as identity authentication are not convenient for application in an open network environment. The keys and procedures for encryption and decryption are exactly the same, the difference is that the sequence of subkey sequences used for encryption and decryption is exactly the opposite. The security of the DES cryptosystem should not depend on the confidentiality of the algorithm, and its security is only based on the confidentiality of the encryption key.

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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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