• Fully Associated Network :-
It is a network system where all nodes are directly connected to each other. Thus it is a completely connected network with a separate physical link for connecting each node to other node. The control is distributed with each computer deciding its communication priorities. In this mode cost is high because more wires are needed to connect nodes but chances of failure are very less.
Merits:
1. Very Reliable.
2. Each node of network need not have individual routing capability.
3. Communication is very easy between nodes.
Demerits:
1. Most Expensive network.
2. Adding more nodes will increase cost manifolds.
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• Multidrop Network :-
In this Topology all nodes are connected via a single link, i.e. Single transmission medium is shared by all nodes. Whenever a message is transmitted, sender and destination address are attached as Tag and message floats on single available line. Receiver receives it and send back acknowledgement message which again floats on same line. There may be many messages floating at a time, that is why named multidrop configuration. It is also called broadcasting network. Very good for LANs!
Merit:
1. Reduction in total physical lines.
2. Reliability is high.
3. Addition, of new nodes is easy.
Demerits:
1. If line fails, entire system breaks down.
2. Each node must have good & quick decision making. In addition to this Hybrid-structure and Mesh technologies are also used.
A LAN's basic building blocks are its computer, servers, printers, and disk drives and interface, cables, connectors, that link together to make LAN. It is very difficult to construct a LAN with physical components all made by a single manufacturer. Managers must pick & choose carefully among a list of different sources.
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