Computer Networks
     3A
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      Learning Outcomes
         By the end of this session, you will be able to:
        Explain the concept of connecting devices 
        Explain different types of networks 
        Describe WiFi and the Internet 
        Describe Bluetooth and file sharing 
         
            
         
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       Connecting Network devices
       
        Organizations implement computer 
        networks so that they:
       1. Communicate via email, video 
          conferencing, instant messaging, etc.
       2. Allow multiple users to share a single 
          hardware device like a printer or scanner
       3. Enable file sharing across the network
       4. Allow for the sharing of software or 
          operating programs on remote systems 
          eg a common database or ERP
       5. Make information easier to access and 
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          maintain among network users
        Connecting Network devices
        
         Connecting technology is determined by the size and 
         structure of the network. There are many types of 
         networks based on size as follows:
          
           Local Area Networks (LAN)  -- this is a network within a room, 
           a floor or a building. It uses the Ethernet cable or WiFi
          
           Personal Area Networks (PAN) – this is a very small network 
           which could be a laptop tethering to a phone and using 
           Bluetooth to print. 
          
           Home Area Networks (HAN) – this is a network in a house 
           comprising a few computers and possibly a modem for 
           internet connectivity. It uses Ethernet, WiFi and Bluetooth. 
          
           Wide Area Networks (WAN) – a computer network spanning 
           several kilometers. It uses public infrastructure like 
           telephone cables, fiber backbone, microwave and radio links. 
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        Connecting Network devices
        
         In order for all the devices to communicate 
         effectively, the use communication protocols. 
        
         Network protocols define a language of 
         instructions and conventions for communication 
         between the network devices. 
        
         A communication protocol is a system of rules 
         that allow two or more entities of a 
         communications system to transmit information 
         via any kind of variation of a physical quantity.
        
         Common communication protocols include: 
         Transmission Control Protocol (TCT), Internet 
         Protocol (IP), Wi-Fi protocol base on IEEE 802.11, 
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