24 ĐỀ THAM KHẢO KÌ THI TUYỂN SINH VÀO LỚP 10 MÔN TIẾNG ANH SỞ GIÁO DỤC HẢI DƯ...
3.1.2 classification of network
1.
2. 3.1.2 Classification of network
What Is a Network?
A network is a collection of
computers and devices connected
together via communications devices
and transmission media
3. 3.1.2 Classification of network
Advantages of using a network include:
• facilitating communications
• sharing hardware
• sharing data and information
• sharing software
• transferring funds.
7. 3.1.2 Classification of network
a) LOCAL AREA NETWORK
Definition
Types of LAN:
Personal area network (PAN)
Home area network (HAN)
Advantages and Disadvantages of LAN
b) METROPOLITAN AREA NETWORK
Definition
Type of MAN
Campus network
Advantages and Disadvantages of MAN
c) WIDE AREA NETWORK
Definition
Types of WAN
Enterprise private network
Virtual private network
Advantages and Disadvantages of WAN
8.
9.
10. 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.
11. 3.1.2 Classification of network
The simplest form of LAN is to connect two
computers together.
COMPUTER COMPUTER
1 2
Switch /
hub
12. 3.1.2 Classification of network
A network which consists of less than 500
interconnected devices across several buildings,
is still recognized as a LAN.
14. 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
Smartphone
Laptop PDA
Mouse Printer
15. 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.
16. 3.1.2 Classification of network
A wired PAN is usually constructed with USB and
Fire wire connections.
17. 3.1.2 Classification of network
Technologies such as Bluetooth and infrared
communication typically form a wireless PAN.
18. 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.
20. 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.
21. 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.
22. 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
23.
24.
25. 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.
27. 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.
28. 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.
29. 3.1.2 Classification of network
Academic
Departments
University
Student
Library
Residence
Halls.
30. 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.
31. 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.
32.
33. 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.
37. 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.
Frequency
Production site Band Head offices
39. 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.
41. 3.1.2 Classification of network
• Increased efficiency
• Ease of communication
• Lowered costs.
42. 3.1.2 Classification of network
• Security problems
• Training costs
• Maintenance problems. Large
enterprises will dedicate personnel to
maintaining their WAN.
43. 3.1.2 Classification of network
Network Number of
Cost Speed
Size computer
Fastest Smallest
LAN Low Small
MAN High Larger Slower Large
Higher Largest Slowest Largest
WAN
45. 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.
Editor's Notes
Advantages Of WAN -Messages can be sent very quickly to anyone else on the network. These messages can have pictures, sounds, or data included with them (called attachments). -Expensive things (such as printers or phone lines to the internet) can be shared by all the computers on the network without having to buy a different peripheral for each computer. -Everyone on the network can use the same data. This avoids problems where some users may have older information than others. -Share information/files over a larger area Disadvantages Of WAN -Setting up a network can be an expensive and complicated experience. The bigger the network the more expensive it is. -Security is a real issue when many different people have the ability to use information from other computers. Protection against hackers and viruses adds more complexity and expense. -Once set up, maintaining a network is a full-time job which requires network supervisors and technicians to be employed. -Information may not meet local needs or interests -Vulnerable to hackers or other outside threats
Advantages Of WAN -Messages can be sent very quickly to anyone else on the network. These messages can have pictures, sounds, or data included with them (called attachments). -Expensive things (such as printers or phone lines to the internet) can be shared by all the computers on the network without having to buy a different peripheral for each computer. -Everyone on the network can use the same data. This avoids problems where some users may have older information than others. -Share information/files over a larger area Disadvantages Of WAN -Setting up a network can be an expensive and complicated experience. The bigger the network the more expensive it is. -Security is a real issue when many different people have the ability to use information from other computers. Protection against hackers and viruses adds more complexity and expense. -Once set up, maintaining a network is a full-time job which requires network supervisors and technicians to be employed. -Information may not meet local needs or interests -Vulnerable to hackers or other outside threats
Advantages Of WAN -Messages can be sent very quickly to anyone else on the network. These messages can have pictures, sounds, or data included with them (called attachments). -Expensive things (such as printers or phone lines to the internet) can be shared by all the computers on the network without having to buy a different peripheral for each computer. -Everyone on the network can use the same data. This avoids problems where some users may have older information than others. -Share information/files over a larger area Disadvantages Of WAN -Setting up a network can be an expensive and complicated experience. The bigger the network the more expensive it is. -Security is a real issue when many different people have the ability to use information from other computers. Protection against hackers and viruses adds more complexity and expense. -Once set up, maintaining a network is a full-time job which requires network supervisors and technicians to be employed. -Information may not meet local needs or interests -Vulnerable to hackers or other outside threats
Advantages Of WAN -Messages can be sent very quickly to anyone else on the network. These messages can have pictures, sounds, or data included with them (called attachments). -Expensive things (such as printers or phone lines to the internet) can be shared by all the computers on the network without having to buy a different peripheral for each computer. -Everyone on the network can use the same data. This avoids problems where some users may have older information than others. -Share information/files over a larger area Disadvantages Of WAN -Setting up a network can be an expensive and complicated experience. The bigger the network the more expensive it is. -Security is a real issue when many different people have the ability to use information from other computers. Protection against hackers and viruses adds more complexity and expense. -Once set up, maintaining a network is a full-time job which requires network supervisors and technicians to be employed. -Information may not meet local needs or interests -Vulnerable to hackers or other outside threats
