Topic 2

1. Networks Class 76 Andries
Topic 2: Types of Networks

2. Networks Class 76 Andries
Network Categories:
Network Categories are determined
by the network size?

3. Networks Class 76 Andries
Network Categories:
What are the three main network
categories?
LAN
Local Area Network
WAN
Wide Area Network
MAN
Metropolitan Area Network

4. Networks Class 76 Andries
Network Categories:
Local Area Network (LAN).
The most common type of data network
Installed in Industrial Plants, Offices Buildings, Campuses and
similar
LAN is usually privately owned
Links devices in a single office
Is controlled by one administrative authority
Assumes other users of the LAN are trusted

5. Networks Class 76 Andries
Network Categories:
Local Area Network.

6. Networks Class 76 Andries
Network Categories:
Wide Area Network (WAN).
Covers a large geographical area
Can cover country, a continent, or even the whole world
Uses communications circuits to connect the intermediate
nodes
Provides long distance transmission of data
Often implemented in the form of virtual private network
(VPN)

7. Networks Class 76 Andries
Network Categories:
Wide Area Network.

8. Networks Class 76 Andries
Network Categories:
Metropolitan Area Network (MAN).
Network with a size between a LAN and a WAN
Normally covers the area inside a town or a city
Covers an area of between 5 and 50 km diameter
Not generally owned by a single organization
Allows sharing of regional resources

9. Networks Class 76 Andries
Network Categories:
Metropolitan Area Network (MAN).

10. Networks Class 76 Andries
Network Categories:
Value Added Network (VAN).
Private network provider
Hired by a company to facilitate electronic data interchange
(EDI)

11. Networks Class 76 Andries
Network Categories:
Value Added Network (VAN).

12. Networks Class 76 Andries
Network Categories:
Internet
A worldwide network of computer networks
Interconnection of large and small networks around the
globe

13. Networks Class 76 Andries
Network Categories:
Internet

14. Networks Class 76 Andries
Network Categories:
Intranet
Set of clients/computers belonging to the same group
Communication is internal
Another definition of an intranet would be that an IP based
network of nodes behind a firewall

15. Networks Class 76 Andries
Network Categories:
Intranet

16. Networks Class 76 Andries
Network Categories:
Extranet
Defined as a business-to-business-intranet
Allows limited, control secure access between a company’s
intranet and users from remote locations
Intranet that allows controlled access by authenticated
parties

17. Networks Class 76 Andries
Network Categories:
Extranet

18. Networks Class 76 Andries
The Internet:
Internet Service Providers (ISP).
International ISP
They are at the top of the hierarchy
They connect nations together
National ISP
They are backbone networks created and maintained by
specialized companies
Regional ISP
They are at the third level of the hierarchy
They are connected to one or more national ISPs

19. Networks Class 76 Andries
The Internet:
Internet Service Providers (ISP).
Local ISP
They provide direct service to the end users.
They can be connected to regional ISPs or directly to national
ISPs.