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ICT Unit 2 - Study Area 1 : Network & Web Basics

Computer Networks
by

Esther Seow

on 26 August 2013

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Transcript of ICT Unit 2 - Study Area 1 : Network & Web Basics

COMPUTER NETWORKS
MUFY ICT 2
Esther Seow
esthers@sunway.edu.my

Network definition
COMMUNICATION
TYPES OF NETWORKS
LAN example
Local Area Network
LOCAL AREA NETWORK
Local Area Network
A network is a collection of 2 or more computers/devices connected together to
COMMUNICATE

and
SHARE RESOURCES
Communication (wired & wireless) via
.
....
email, Web, Internet, messaging (text,picture, video, instant), chatrooms, FTP, tele/video conferencing, etc..
LOCAL AREA NETWORK
connects computers and devices in a small geographical area (eg: a home, an office, a university)
lower setup cost compared to WANs/MANs
typically owned, controlled, and managed by a single person or an organization
In a house you could have 4 computers, 1 desktop and 3 laptops, all connected via wireless internet. A printer can be connected to the network as well, allowing all the computers, no matter where in the house they were, to print to that one printer. Office buildings often do the same thing, linking the computers in the building, or a particular floor, together and sharing one printer between them
LAN’s enable the sharing of resources such as files or hardware devices that may be needed by multiple users
speeds from 10 Mbps to 10 Gbps
requires minimal wiring (typically a cable connecting to each device)
WLAN (Wireless LAN)
WIDE AREA NETWORK
METROPOLITAN AREA NETWORK
STORAGE AREA NETWORK
PERSONAL AREA NETWORK
TYPES OF NETWORKS
LOCAL AREA NETWORK
WIDE AREA NETWORK
METROPOLITAN AREA NETWORK
STORAGE AREA NETWORK
PERSONAL AREA NETWORK
Wide Area Network
covers a large geographic area such as a city, country, or spans even intercontinental distances
using a communications channel that combines many types of media (eg telephone lines, cables, air waves)
Wide Area Network
Wide Area Network
A WAN is a geographically-dispersed collection of LANs.
A network device called a
router
connects LANs to a WAN
TYPES OF NETWORKS
LOCAL AREA NETWORK
WIDE AREA NETWORK
METROPOLITAN AREA NETWORK
STORAGE AREA NETWORK
PERSONAL AREA NETWORK
Metropolitan Area Network
spans a physical area larger than a LAN but smaller than a WAN (eg. a city)
A MAN is typically owned and operated by a single entity such as a government body or a large corporation
Metropolitan Area Network
A MAN usually interconnects a number of LANs using a high-capacity backbone technology, such as fiber-optical links, and provides up-link services to wide area networks (or WAN) and the Internet
Metropolitan Area Network
Other networks...
Storage Area Network - connects servers to data storage devices through a technology eg fibre channel
Personal Area Network - devices connected within the range of an individual person (eg, mobile phone, tablet, laptop)
Personal Area Network (PAN)
NETWORK ARCHITECTURE
defines the layout of a network
consisting of the hardware, software, connectivity, communication protocols and transmission mode (wired or wireless)
NETWORK ARCHITECTURE
1. CLIENT SERVER ARCHITECTURE

2. PEER-TO-PEER ARCHITECTURE
each computer on the network is either a client or a server
Servers are powerful computers dedicated to managing disk drives (file servers), printers (print servers), or network traffic (network servers )
Clients are PCs or workstations on which users run applications. Clients rely on servers for resources, such as files, devices, and even processing power
Client server architecture
Client server architecture
computers are connected individually in pairs (1 to 1 connection)
no dedicated server, all computers are equal, termed as peers
each computer on the network has the capability to share data and resources with other computers
PEER-TO-PEER ARCHITECTURE
Peer-to-peer architecture
January 2013
Full transcript