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Advantages of using a network include: • facilitating communications• sharing hardware• sharing data and information• sharing software• transferring funds.
3.1.2 Classification of network
3.1.2 Classification of network
The main differentiation among these classifications is their area of coverage.
LAN, MAN and WAN compared
3.1.2 Classification of network
3.1.2 Classification of network
A local area network (LAN) is a network that connects computers and devices in a limited geographical area.
Example such as a home, school computer laboratory, office building or closely positioned group of buildings.
3.1.2 Classification of network
The simplest form of LAN is to connect two computers together.
COMPUTER2
COMPUTER1
3.1.2 Classification of network
Switch /hub
A network which consists of less than 500 interconnected devices across several buildings, is still recognized as a LAN.
3.1.2 Classification of network
3.1.2 Classification of network
A personal area network (PAN) is a computer network used for communication among computer and different information technological devices close to one person.
Headphone
PDA
PrinterMouse
Laptop
Smartphone
3.1.2 Classification of network
Examples of devices that are used in a PAN are:◦ Personal computers◦ Printers◦ Fax machines◦ Telephones◦ PDAs◦ Scanners◦ Video game consoles.
3.1.2 Classification of network
A wired PAN is usually constructed with USB and Fire wire connections.
3.1.2 Classification of network
Technologies such as Bluetooth and infrared communication typically form a wireless PAN.
3.1.2 Classification of network
A home area network (HAN) is a residential LAN which is used for communication between digital devices typically deployed in the home, usually a small number of personal computers and accessories, such as printers and mobile computing devices.
3.1.2 Classification of network
3.1.2 Classification of network
An important function is the sharing of Internet access, often a broadband service through a Digital Subscriber Line (DSL) provider.
3.1.2 Classification of network
• Easy to share devices (printers, scanners, external drives)
• Easy to share data (homework, pictures)
• Cost of LAN Setup is low.
3.1.2 Classification of network
•Power - a good LAN is required to be on all the times. •Security - each computer and device become another point of entry for undesirables.
• if all computers running at once, can reduce speed for each.
• Area covered is limited
3.1.2 Classification of network
A metropolitan area network (MAN) is a high-speed network that connects local area networks in a metropolitan area
Example such as a city or town and handles the bulk of communications activity across that region.
3.1.2 Classification of network
3.1.2 Classification of network
A campus network is a computer network made up of an interconnection of local area networks (LAN's) within a limited geographical area.
3.1.2 Classification of network
In the case of a university campus-based campus network, the network is likely to link a variety of campus buildings including; academic departments, the university library and student residence halls.
3.1.2 Classification of network
Academic Departments
University Library Student
Residence Halls.
3.1.2 Classification of network
• Efficiency and shared access.
• All the computer-owning residents of the area have equal ability to go on line.
3.1.2 Classification of network
• It can be costly (hardware, software, support, etc.)• Security problems • As the network consists of many
computers over the span of a city, the connection can lag or become quite slow.
3.1.2 Classification of network
A wide area network (WAN) is a network that covers a large geographic area (such as a city, country, or the world) using a communications channel that combines many types of media such as telephone lines, cables, and radio waves.
3.1.2 Classification of network
The Internet is the world’s largest WAN.
3.1.2 Classification of network
3.1.2 Classification of network
An enterprise private network is a network build by an enterprise to interconnect various company sites, e.g., production sites, head offices, remote offices, shops, in order to share computer resources.
Production site Head offices Frequency
Band
3.1.2 Classification of network
Production site Head offices
Frequency Band
3.1.2 Classification of network
A virtual private network (VPN) is a computer network in which some of the links between nodes are carried by open connections or virtual circuits in some larger network (e.g., the Internet) instead of by physical wires.
3.1.2 Classification of network
VPNserver
3.1.2 Classification of network
• Increased efficiency
• Ease of communication
• Lowered costs.
3.1.2 Classification of network
• Security problems
• Training costs
•Maintenance problems. Large enterprises will dedicate personnel to maintaining their WAN.
3.1.2 Classification of network
CostNetwork Size
SpeedNumber
of computer
Low Small Fastest Smallest
High Larger Slower Large
Higher Largest Slowest Largest
3.1.2 Classification of network
LAN
MAN
WAN
3.1.2 Classification of network
What is a network? What are three advantages of using a
network? Give two types of LAN configuration. Give two types of WAN configuration. List down two of WAN disadvantages. Give two types of network communication
standard in wired category. Give three types of network
communication standard in wireless category.
