Lan Network Ethernet

Types of Network - ethernet, tokenring and arcnet

Types of Network

There are three types of networks that are commonly heard about. They are ethernet, token-ring, and ARCnet.

Ethernet - The network interface cards share a common cable. This cable structure does not need to form a structure, but must be essentially common to all cards on the network. Before a card transmits, it listens for a break in traffic. The cards have collision detection, and if the card detects a collision while trying to transmit, it will retry after some random time interval.Visit this site to get more information about network.

Token Ring - Token ring networks form a complete electrical loop, or ring. Around the ring are computers, called stations. The cards, using their built in serial numbers, negotiate to determine what card will be the master interface card. This card will create what is called a token, that will allow other cards to send data. Essentially, when a card with data to send, receives a token, it sends its data to the next station up the ring to be relayed. The master interface will then create a new token and the process begins again.

ARCnet - ARCnet networks designate a master card. The master card keeps a table of active cards, polling each one sequentially with transmit permission. The LAN server continuously circulates empty message frames on a bus. When a device wants to send a message, it inserts a "token" in an empty frame in which it also inserts the message. The scheme is very efficient when traffic increases since all devices are afforded the same opportunity to use the shared network.

 

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