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Computer Communication

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Section 1 Introduction

1.1 COMMUNICATIONS

Computer communications is the process of sharing data, programs, and information between two or more computers. We have discussed numerous applications that depend on communication systems, including: • E-mail – Provides a fast, efficient alternative to traditional mail by sending and receiving electronic documents. • Instant messaging – Supports direct, “live” electronic communication between two or more friends or buddies. • Internet telephone – provides a very low cost alternative to long-distance telephone calls using electronic voice delivery. • Electronic commerce – buying and selling goods electronically
In this chapter, we will focus on the communication systems …show more content…

LANs are widely used by colleges, universities and other types of organizations to link microcomputers and to share printers and other resources.

The LAN represented is a typical arrangement and provides two benefits are
Economy and flexibility. People can share costly equipment. For instance, the four micro computers share the laser printer and the file server, which are expensive pieces of hardware, Other equipment or nods may also be added to the LAN – for instance, more microcomputers a mainframe computer or optical disk storage devices. Additional t he network gateway is a device that allows one LAN to be linked to other LANs or to a larger network. For example, the LAN of one office group may be connected to the LAN of another office group.
There are a variety of different standards or ways in which nodes can be connected to one another and ways in which their communications are controlled in a LAN. The most common standard is known as Ethernet. LANs using this standard are sometimes referred to as Ethernet LANs

HOME NETWORKS

While LANs have been widely used within organizations for years, they are now being commonly used by individuals in their homes and apartments. These LANs called home networks allow different computers to share resources including a common Internet connection. Computers can be connected in a variety of ways including electrical wiring, telephone wiring and special cables. One of the simplest ways however is

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