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COMPUTER NETWORKS Lecture Notes

COMPUTER NETWORKS . Lecture Notes DEPARTMENT OF COMPUTER SCIENCE & ENGINEERING. SHRI VISHNU ENGINEERING COLLEGE FOR WOMEN. (Approved by AICTE, Accredited by NBA, Affiliated to JNTU Kakinada). BHIMAVARAM 534 202. 0. UNIT -I. Introduction to COMPUTER NETWORKS Data Communication:When we communicate, we are sharing information. This sharing can be local or remote. Between individuals, local communication usually occurs face to face, while remote communication takes place over distance. Components: A data communications system has five components. 1. Message. The message is the information (data) to be communicated. Popular forms of information include text, numbers, pictures, audio, and video. 2. Sender. The sender is the device that sends the data message.

The topology of a network is the geometric representation of the relationship of all the links and linking devices (usually called nodes) to one another. There are four basic topologies possible: mesh, star, bus, and ring Mesh: In a mesh topology, every device has a dedicated point-to-point link to every other device.

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