Encryption
Applying a certain algorithm to data in order to change how it appears and render it confusing to others without access. Datagram Transport Layer Security (DTLS) keeps packets secure when data encryption is enabled for an AP. Various authentication mechanisms are used during the identification procedure. Security features like frame authentication and encryption are used to protect wireless data. The data must be encrypted on a wireless network to ensure data privacy. This is achieved by encrypting the payload of the data in each wireless frame right before transmission and decrypting it upon reception. The goal is to successfully encrypt and decrypt the data by employing an encryption technique that both the transmitter and receiver can use. All clients must associate using the same encryption method because each WLAN in wireless networks may only allow one authentication and encryption methodology. In order for the AP and a client to interpret each other’s data, they should be the only two devices that share the encryption keys. No device should be aware of the keys or be able to use them to intercept and decode the data.
Wireless Principles in CCNA
Wireless communication takes place over free space over RF (Radio Frequency), where one device (transmitter) sends a signal to another device (receiver). Two devices (transmitter and receiver) must use the same frequency (or channel) to communicate with each other. Radio frequencies can cause interference when many wireless devices communicate at the same time. As the number of devices increases, the interference increases. The following topics describe the concept of wireless principles in CCNA.