Cisco® CCNA Exam Cram Notes : Encryption

I. Networking Fundamentals

7. Describe wireless principles

7.4 Encryption

Applying a specific algorithm to data to alter the appearance of the data, making it incomprehensible to those who are not authorized to see the information. When data encryption is enabled for an AP, packets are protected with Datagram Transport Layer Security DTLS).The identification process is performed through various authentication schemes. Protecting wireless data involves security functions like encryption and frame authentication. To protect data privacy on a wireless network, the data should be encrypted. This is accomplished by encrypting the data payload in each wireless frame just prior to being transmitted, then decrypting it as it is received. The idea is to use an encryption method that the transmitter and receiver share, so the data can be encrypted and decrypted successfully. In wireless networks, each WLAN may support only one authentication and encryption scheme, so all clients must use the same encryption method when they associate. Ideally, the AP and a client are the only two devices that have the encryption keys in common so that they can understand each other’s data. No other device should know about or be able to use the same keys to eavesdrop and decrypt the data.

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