So now we have seen how this network all started and what it has went through. Mentioned above are the few important dates where we have more to come on the way. Let us now proceed with the talks and to start with we have the two types of transmission technology that are in use, namely:
Broadcast networks have a single communication channel that is shared by all the machines on the network. Packets (short messages or fundamental unit of message carriages) are sent by a machine and received by all others. There is an address field in the packet and when the machines on the network receive the packets it checks for the address field. If the packet is for the intended machine the packet is processed or else ignored. This kind of system generally gives a possibility to the packet that all the machines on the network can address it by use of a special code in the address field. When such a packet is received all the machines in the network process it. This is called as “Broadcasting”.
Note: Broadcasting is not supported by all computer networks; for example, neither X.25 nor frame relay supply a broadcast capability, nor is any form of Internet-wide broadcast. Broadcasting is largely confined to local area network (LAN) technologies, most notably Ethernet and Token Ring, where the performance impact of broadcasting is not as large as it would be in a wide area network.
The second type of technique called point to point network actually consist of many connections between the individual pairs of machines. For moving from source to destination, a packet on such a network may has first to visit one or more intermidiary machine. In such a network it is possible to have many different routes for reaching out the destination with different leangth. So finding a good path is a necessity in such a network. A pont to point transmission where there is only one sender and one receiver is said to be “Unicasting”.
Now when we have seen about the most widespread transmission technology on the networks we need to discuss about the classification of the network. Basically the networks are classified on their physical sizes (distances). Here are some classifications
Distances Area(sq. meter) Type
1m Square Meter Personnel Area Network
10m-1km Building, Campus, Room Local Area Network
10km City Metropolitan Area Network
100km-1000km Country,Continent Wide Area Network
10000Km Planet The Internet
We can now start our discussion based on the classification on the networks
- Broadcast Links
- Point-to-Point Links
Broadcast networks have a single communication channel that is shared by all the machines on the network. Packets (short messages or fundamental unit of message carriages) are sent by a machine and received by all others. There is an address field in the packet and when the machines on the network receive the packets it checks for the address field. If the packet is for the intended machine the packet is processed or else ignored. This kind of system generally gives a possibility to the packet that all the machines on the network can address it by use of a special code in the address field. When such a packet is received all the machines in the network process it. This is called as “Broadcasting”.
Note: Broadcasting is not supported by all computer networks; for example, neither X.25 nor frame relay supply a broadcast capability, nor is any form of Internet-wide broadcast. Broadcasting is largely confined to local area network (LAN) technologies, most notably Ethernet and Token Ring, where the performance impact of broadcasting is not as large as it would be in a wide area network.
The second type of technique called point to point network actually consist of many connections between the individual pairs of machines. For moving from source to destination, a packet on such a network may has first to visit one or more intermidiary machine. In such a network it is possible to have many different routes for reaching out the destination with different leangth. So finding a good path is a necessity in such a network. A pont to point transmission where there is only one sender and one receiver is said to be “Unicasting”.
Now when we have seen about the most widespread transmission technology on the networks we need to discuss about the classification of the network. Basically the networks are classified on their physical sizes (distances). Here are some classifications
Distances Area(sq. meter) Type
1m Square Meter Personnel Area Network
10m-1km Building, Campus, Room Local Area Network
10km City Metropolitan Area Network
100km-1000km Country,Continent Wide Area Network
10000Km Planet The Internet
We can now start our discussion based on the classification on the networks
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