1. Network Models, Hardware, Protocols and number systems
Term1
Network Models, Hardware, Protocols and number systems

2. Startup Exercise Start your Packet tracer program:
Draw a Star topology network including the following (switch 2960 , A server , 3 desktop computers) – connect between them using copper straight cable )

3. Network Models ( peer to peer and client server) models
Unit2 Objectives:
Network Models ( peer to peer and client server) models
Types of servers
Network Hardware and components

4. Network Models

5. Network Models
Network Models: is network’s physical components and their functional organization and configuration

6. 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.

7. 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

8. 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.

9. 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

10. 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

11. 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

12. Book Activity – P69

13. Hardware: are all the parts that you can see and touch
Network Hardware
Hardware: are all the parts that you can see and touch
Example of Hardware :
Screen
Keyboard
Tablet

14. Software: is made up of all the programs and apps
Network Hardware
Software: is made up of all the programs and apps
Example of Software :
Packet Tracer
Office (Word – Excel …)
Internet Explorer

15. End Devices
End Devices (hosts): refers to all the devices used to send or receive data
Some examples of end devices are:
Computers (such as work stations, laptops, file servers and web servers)
Network printers
Telephones and teleconferencing equipment
Security cameras
Mobile devices (such as smart phones, tablets, PDAs, wireless debit/credit card readers and barcode scanners)

16. End Devices
End Devices in Packet Tracer

17. Network Interface Card (NIC)
Network Interface Card: is the port or card where the network cable is connected
NIC converts data signals into a signal that can be sent over the medium
Each NIC has a MAC address (unique address that identified each device on a local network)

18. Router Network Devices
Network Devices: help us to connect to all hosts together and to access to service on the network
Router

19. Network Devices
Network Devices in Packet Tracer

20. Network Devices - Switch
Switch: used to connect end devices to a LAN, it uses MAC address to send data frames to correct device

21. Network Devices - Router
Router: used to send packets from one LAN to another, it uses IP address to direct the data packets
Home Router is called home gateway to connect LAN to WAN

22. Book Activity – P76 -84