SSID
Service Set Identifier is referred to as SSID. The name of the Wi-Fi network is SSID. An SSID is a 32-character unique ID that is used to identify wireless networks. SSIDs ensure that data is routed to the proper spot when several wireless networks coexist in the same area. The network is connected to a MAC address on the AP. A service set identifier is what your clients use to connect to this network or workgroup (SSID). Therefore, the SSID on the AP is a mashup of the MAC address and network name. This MAC address may be a different MAC address created on the AP or wireless radio. A Basic Service Set Identifier is used to describe an AP that only provides service to one network (BSSID). The option to use multiple SSIDs is provided by APS. This will enable you to use the same AP while providing both a Guest Network and a Corporate Network. Multiple Basic Service Set Identifiers are used when an AP has multiple networks (MBSSID). Despite serving a number of networks, it is the same hardware. Users on one network share with users on another because the hardware and frequency range are the same, and if they communicate at the same time, they may clash.
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.