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1. Introduction Of Networking
sadiqkhalif
Introduction Of Networking
Ilays National University
Las-anod Sool Somalia

2. What is a “Network”?
A network consists of two or more entities or objects sharing resources
and information.
Computers on a network can act as a client or a server.
A client is a computer that requests for resources.
A server is a computer that controls and provides access to resources.

3. Need for Networks
 Enhance communication.
 Share resources
 Share hardware
 Share software
 Share information
 Facilitate centralized management

4. Classification of Networks
Networks are frequently classified according to the geographical
boundaries spanned by the network it self.
LAN, WAN, and MAN are the basic types of classification, of which LAN
and WAN are frequently used.

5. Local area network (LAN)
A LAN covers a relatively small area such as a classroom, school, or a single
building.
LANs are inexpensive to install and also provide higher speeds.

6. Local area network

7. Metropolitan area network
(MAN)
A MAN spans the distance of a typical metropolitan city.
The cost of installation and operation is higher.
MANs use high-speed connections such as fiber optics to achieve higher speeds.

8. Metropolitan area network

9. Wide area network (WAN)
WANs span a larger area than a single city.
These use long distance telecommunication networks for connection, thereby
increasing the cost.
The Internet is a good example of a WAN.

10. Wide area network

11. COMMUNICATION MEDIA
To transfer data from one computer to another requires some type of link through
which the data can be transmitted. This link is known as the communication
channel.
To send data through the channel requires some type of transmission media which
may be either physical or wireless.

13. Network Communication Protocols
A protocol is simply an agreed-on set of rules and procedures for
transmitting data between two or more devices.

14. Protocol concepts
Protocols are sets of rules.
 What do you want to do? (Application)
 Where are you going? (Addressing)
 How do you get there? (Media types)
 Did you get there? (Acknowledgments, Error checking)