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by Dinesh Thakur Category: Computer Network

The transmission technology can be categorized broadly into two types:

1. Broadcast networks and

2. Point-to-point networks.

1. Broadcast networks:

• Broadcast networks have a single communication channel that is shared or used by all the machines on the network. Short messages called packets sent by any machine are received by all the others.

• Broadcast systems generally use a special code in the address field for addressing a packet to all the concerned computers. This mode of operation is called broadcasting.

• Some broadcast systems also support transmission to a subset of the machines known as multicasting.

• Upon receiving a packet, a machine checks the address field. If the packet is addressed to it then the packet is processed, otherwise the packet is ignored.

2. Point-to-point networks:

• Point to point networks consists of many connections between individual pairs of machines. To go from the source to the destination a packet on these types of network may have to go through intermediate computers before they reach the desired computer.

• Often the packets have to follow multiple routes, of different lengths.

• Hence routing algorithms are very important in the point-to-point networks.

• An important general rule is as follows:

Small, localized networks (e.g. LAN) tend to use the broadcasting; whereas networks located over wide geographical areas (such as WAN) use point-to-point transmission.

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