ccna 1 chapter 4 pdf

ccna 1 chapter 4 pdf

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Although node encryption can provide higher security for network data, its operation mode is similar to link encryption : both provide security for the transmitted message on the communication link ; both are performed at the intermediate node. The message is decrypted and then encrypted. Because all transmitted data is encrypted,ccna 1 chapter 4 pdf, the encryption process is transparent to the user. To understand digital signatures, you should start with electronic signatures. To understand what an electronic signature is, you need to start with traditional manual signatures or stamping. In traditional business activities, in order to ensure the safety and authenticity of the transaction, a written contract or official document must be signed and sealed by the parties or the person in charge, so that the parties to the transaction can identify who signed the contract and ensure that the person who signed or sealed the contract Only by recognizing the content of the contract can the contract be recognized legally. In the virtual world of e-commerce, contracts or documents are expressed and delivered in the form of electronic documents. On electronic documents, traditional handwritten signatures and stamps cannot be performed, which must be replaced by technical means. Electronic signatures that can identify the true identities of both parties in an electronic file, ensure the security, authenticity and non-repudiation of the transaction, and have the same effect as a handwritten signature or a stamp, are called electronic signatures. Legally speaking, a signature has two functions, namely, to identify the signer and to indicate the signer's approval of the content of the document.

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Latest Cisco CCNA 200-301 Dumps

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