ccna 1 chapter 8 pdf

ccna 1 chapter 8 pdf

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(9) Use the Ping command to verify the correctness of the access. If this command fails, it means that the network can not access the service unit. You should check the network connection and make sure that the network connection is normal and you can access the server before proceeding to the next step. Manufacturer: Shenyang Dongda Alpine Software Co., Ltd. 5.5.6 Do audit work well (1) Harmless type: In addition to reducing the available space of the disk during infection, it has no other impact on the system. (3) End-to-end encryption is an encryption method for data from one end to the other. The data is encrypted at the sending end and decrypted at the receiving end. The intermediate node does not appear in plaintext. End-to-end encryption is done at the application layer. In end-to-end encryption, all messages except the header in the data transmission unit run through the entire transmission process in the form of ciphertext. Only at the sending end and the receiving end are there encryption and decryption equipment, and any node in the middle of the message No decryption. Therefore, there is no need for cryptographic equipment, and compared with link encryption,ccna 1 chapter 8 pdf, the number of cryptographic equipment can be reduced. On the other hand, the data transmission unit is composed of a header and a message . The message is a collection of data to be transmitted, and the header is routing information, etc. ( because routing is involved in end-to-end transmission ) . In link encryption, both the message and the header must be encrypted. In end-to-end encryption, although each intermediate node on the path does not decrypt the message, in order to transmit the message to the destination, routing information must be checked. Therefore, only the message can be encrypted, but the header cannot be encrypted. In this way, it is easy to be discovered by some communication analysis, and some sensitive information can be obtained from it. Link encryption is easier for users and uses fewer keys, while end-to-end encryption is more flexible and visible to users. End-to-end encryption can also be used when the security status of each node in the link encryption is not assured.

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