All types of LAN & Purpose of Use,

 LAN or local area network is a type of connection for devices located in a specific geographic area. It is classified into four types according to the distribution method used on the Managed Lan Services. They are called "Ethernet" for a local area network, where the network is created as a wired, "Token Ring" to connect devices in a circular ring with a token that is passed through the network to allow the connection, "Token Bus "to connect devices using coaxial cables and tokens. , "FDDI or Fiber Distributed Data Interface" for faster network connectivity using fiber and copper cables.

1) Ethernet

• It is a network protocol that controls the transmission of data over a local area network.
• In this type of LAN, the user can transfer data at a speed of more than 10 megabits per second.
• First, the system checks the medium used for data transfer, if the medium is available, then only data transfer takes place.
• It is used in wired local area networks.
• When a machine or machines want to communicate with each other on a network, they discover a backbone that connects all the devices that will be used to transmit data. If the main cable, called the middle cable, is available and free, which means that no other machine on the network is transmitting data, the sending machine starts sending data packets over the network.

2. Token Ring

• This is a type of local area network in which all devices are connected in a ring.
• All devices are connected in a circle and receive a token according to their requirements. The token continues to rotate in a circular ring.
• The token is used to avoid data conflicts. It is 3 bytes long and continues to travel around the ring of servers or workstations.

3. Symbolic bus

• It is also a type of local area network developed by IBM.
• The Token Bus standard uses coaxial copper cables to connect various devices to large computers or workstations. The coaxial cable acts as a common communication bus.
• This protocol also creates an access control token for communication.
• Any computer that stores the token can transmit data. The token is released when the station finishes transmitting data or when a device with a higher priority needs to transmit (for example, a central computer).
• Due to the token release mechanism, there is no collision, that is, two or more devices can easily transmit information on the bus at the same time, and the transmitted data is also protected against destruction.
• This is similar to a Token-Ring network, but the difference is that the ends of the network do not meet each other to form a ring. But the network is disrupted at both ends.

4. Fiber Distributed Data Interface (FDDI)

• It is a LAN standard used to transfer data through optical media.
• Used in long distance communication networks.
• It uses fiber optic and copper cable.
• It provides communication over fiber optic cables at a distance of up to 200 kilometers at a speed of 100 Mbit / s.
• FDDI has two token rings, primary and secondary communication rings. One ring is intended for backup in case of failure of the main.

Conclusion: LAN types:

All types of LAN have their own importance and purpose of use, but they also have their limitations and problems. As in the token ring, if the station goes down, the data packets continue to circulate, which is known as the lost packet problem, then data corruption is also present, etc. - because of the high cost. Token Ring product prices are more expensive than Ethernet at similar speeds, so it is very important to take note of all the details before using any type of LAN.