A Computer network is a network of computers that are geographically distributed, but connected in a manner to enable meaningful transmission and exchange of data among them.
Basic Elements of a communication System.
Sender : - Creates and sends the message.
Medium: - Carries a message
Receiver: - Receive a message
Topology of a network refers to the way in which the network's nodes(computer or other devices that need to communicate) are linked together.
It determines the various data paths available between any pair of nodes in the network.
Choice of a topology for a computer network depends on a combination of factors, such as:
Desired Performance of the system
Reliability Of the system.
Size(Numbers of nodes and their geographical distribution) of the system).
Cost of components and services required to implement network
Availability of communication lines
Advantages Of Star topology
Star topology has minimal line cost because only "n-1" lines are required for connecting "n" nodes.
Transmission delays between two nodes do not increase by adding new nodes to network, because any two nodes are connected via two links only.
If any node other than the host node fails, remaining nodes are unaffected