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
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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
4)LAN (Local Area Network)-A LAN is a group of computers or devices connected together through a local network.LAN connections are usually very inexpensive.They are also usually very fast.LAN connections are usually within the same building.
A: LAN: LAN stands for Local Area Network. LAN is a network which cover a small area like colleges, schools or buildings.
In the early years of the internet, large scaled groups of computer were a bit of an issue, it was a pain to manage computers in respects to the communication between all the clients inside that group. Not only was it inevitable that businesses would require many more computers in their offices but it was also inevitable that the demand for this was going to increase both in and out of the work place. Initially the main driving at the time for Local area networking was so that people in the same
A LAN is a ‘Local Area Network’. It is a small network of computers most often
When setting up a LAN the architecture that you decide to choose is important. There are several factors that are decided when choosing said architecture, some of these being network speeds, types of cables, and access control mechanisms like collision detection (Team, 2011). The most common on in today’s LANs is Ethernet. These can be either wireless, wired, or a hybrid of both.
It is generally limited to a geographic area such as a writing lab, school, or building. Rarely are LAN computers more than a mile apart. In a typical LAN configuration, one computer is designated as the file server. It stores all of the software that controls the network, as well as the software that can be shared by the computers attached to the network. Computers connected to the file server are called workstations. The workstations can be less powerful than the file server, and they may have additional software on their hard drives. On many LANs, cables are used to connect the network interface cards in each computer; other LANs may be wireless.
Ethernet is typically the technology that is used to allow computers locally to communicate with one another. Computers that are close to each other they are connected by Ethernet.
LAN stands for Local Area Network. LAN is a type of network that interconnects computers and devices either wired or wireless and covers a greater distance. LAN is mainly used in private organisations such as college or university. More or less everyone uses wireless router at home these days and the user is able to connect between 5-10 devices wirelessly. The user can share the broadband or the connection with ADSL by using Ethernet cables. Smaller LANs can connect at least
Task 1: Describe the data communication types used historically and the developments that have led to modern day Local Area Networks (LANs). Detail any emerging technologies and where you think data communications are likely to be in ten year’s time.
LANs standards and protocols are Ethernet, IEEE 802.2 [IEEE 802.3, 100BaseT, Token Ring/IEEE 802.5 and FDDI.
For example, the Sales and Marketing Division has a desktop computer for each of the account representatives. All of these computers are connected to a small local area network (LAN) that serves only the Sales and Marketing Division. The
Ideally, each local office would integrate its computers with a LAN, so that all employees would be able to share information, and resources such as printers. In case there are multiple buildings in an office (like in the corporate office), each building would have its own LAN, and the LANs could be connected by a Backbone Network.
When the first computers were made, they couldn’t talk to each other if they weren’t the same type. But now with the standardising of components, it is now easier than ever for different computers to connect to each other in a LAN (Local Area Network).
Advancements in the information technology sector have brought many benefits to the people all around the world. Today with computer networking, we can chat, speak and see each other over a long distance. Data communication refers to the transmission of the digital signals over a communication channel between the transmitter and receiver computers. Communication is possible only with wired and wireless connectivity of the computers with each other.
As correspondence and data ventures speedier and quicker, the world appears more diminutive and littler, and this has vast suggestions for the way we lead business. Putting away vital in records on a workstation instead of in drawers, for example, has made data effortlessly open. Utilizing email permits organizations to convey and send these documents rapidly to remote areas outside of an office.