1. Network Media, models and number systems
Term1
Network Media, models and number systems

2. Network Models ( peer to peer and client server) models
Unit2 Objectives:
Network Models ( peer to peer and client server) models
Convert between binary, denary and hexadecimal numbers
Convert Binary to Denary

3. Network Models

4. Clients and Servers
Powerful computer (servers) provides resources to small computers called clients.
Servers have software installed that enable them to provide information and services, like or web pages, to other hosts on the network. Each service requires separate server software.

5. Types of servers File Server Web Server Database Server Game Server
Gives clients space to save and get files
Stores and gives clients access to webpages
Gives access to a database to store and get data
Application servers gives clients access to gaming service

6. Clients and Servers Clients (hosts)
are computer that have software to request and display the information obtained from the server.
An example of client software is a web browser, such as Internet Explorer, Safari, Mozilla Firefox or Chrome.

7. Clients and Servers Model
Advantages
Easy to manage (one administrator)
High security
All files backed up.
Clients can get programs from server
Easy to add more computers
Disadvantages
Costly
If server is down no work can be done
Not easy to set up

8. Peer to Peer Network Model
All computers are equal.
All computers can act as clients and servers.
Example : sending pictures by Bluetooth from your phone to laptop

9. Peer to Peer Network Model
Advantages
Easy to setup
Less complex
Cheaper
Can be used for simple tasks, ( transferring files and sharing printers)
Disadvantages
No centralized administration
Not secured
Can not add more computers
Network is slow because all devices may act as both clients and servers

10. Book Activity – P67

11. Binary and hexadecimal
Denary System
The number system we use every day, based on 10 digits (0,1,2,3,4,5,6,7,8,9)

12. Binary and hexadecimal
Binary System
The number system that uses 0s and 1s to represent each bit. This base two numbering system

13. Converting Denary to Binary
Convert 5 from denary to binary
Remainder

14. Converting Denary to Binary
Book Activity P-69 2 3
1101

15. Converting Denary to Binary
Book Activity P-70 22 5 1 1 1
10110

16. Book Activities
Book Activity P-71-72
Home Work Assignment

17. Converting Denary to Binary
One Minute Activity
Converting Denary to Binary
Convert the number 220 to binary number and be the Winner

18. Converting Binary to Denary
To convert a number from binary to denary let’s follow this method
128 64 32 16 8 4 2 1
1+4+8 =13 x2 x2 x2 x2 x2 x2 x2 4 15

19. Book Activities
Book Activity P-74