What is WLAN and how it works?

It is a pretty broad question and I am assuming we are talking about WiFi (the most common WLAN technology). So, in pretty high level terms =

There is a WiFi access point. This consists of a radio transmitter / receiver that is connected to an ethernet switch - usually there is a router attached to that switch also - and frequently that router is connected to the internet.

There is a WiFi interface on the ‘user device’ (laptop, phone, etc). This consists of an radio transmitter / receiver that is connected to an ethernet switch inside the device which is connected to the TCP/IP stack on the ‘user device’.

So … there is a protocol between the two radios for connecting them to one another … usually this starts with the Access Point broadcasting its presence, and the User Device selecting it to connect. Once the User does this, the protocol goes through several more steps for establishing & maintaining the connection. This is where any authentication & encryption might occur.

Once the connection is established, it appears to the ethernet switches on either end that they are connected to each other (which they are via the radio connection).

Everything after this is pretty much like normal Local Area Network / Ethernet / IP operations.

WLANs utilize radio, infrared and microwave transmission to transmit information starting with one point then onto the next without links. Hence, WLAN offers an approach to assemble a Local Area Network without links. This WLAN would then be able to be appended to an already existing bigger network, the web for instance.

A remote LAN comprises of hubs and access-points. A hub is a PC or a fringe, (for example, a printer) that has a system connector, in WLANs case with a reception antenna. Access-points work as transmitters and collectors between the hubs themselves or between the hubs and another system. WLAN – Wireless Local Area Network is a remote system that takes a shot at two recurrence groups – 2.4 GHz and 5 GHz. A progressively well-known name for the WLAN is WiFi.

The frequency, speed of information move and scope of the remote system rely upon which WLAN sign is connected.