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1. Basic Concept of Network

1.1. Communications devices : communication devices is any type of hardware capable of transmitting data, instruction, and information between a sending device and receiving device

1.1.1. Type Modems - analog signal from telephone cable wire to a digital signal Wireless Access Point(WAP) - allows computer and devices to transfer data wirelessly among themselves Router - connects multiple computer and transmits data to its correct destination Network Cards - electronic device that connects a computer network, use a LAN Hubs or Switches - a central point for cables in a network

1.2. Transmission Media : material or substances capable of carrying one or more communication signals

1.2.1. Type Physical/ Wired transmission media Twisted-pair cable Coaxial cable Fiber-Optic Cable Wireless Transmission Media :send communication signals through the air or space example radiowave Infrared - send signal using infrared light wave Brodcast Radio - distributes radio signala through the air over long distance Cellular Radio - use for mobile communication, specifically wireless modems and mobile phone Microwaves - that provide a high-speed signal transmission. Communication Satellite - a space that receives microwave signals from an earth-based station

1.3. Advantages of using network

1.3.1. Help people communicate efficiently and easily

1.3.2. sharing devices by multiple users

1.3.3. can access shared software on the network

1.4. Disadvantages of using network

1.4.1. viruses easily spread to other computers

1.4.2. if server down data on the network cant be access

1.4.3. a largest network need to be maintain by expert worker

2. Network Architecture

2.1. Defination : The configuration of computers, devices, and media on a network

2.2. Client/Server

2.2.1. one or more computers act as a server, and the other computers on the network request services from the server

2.2.2. a server controls access to the hardware , software, and other resources on the network

2.2.3. a server provides a centralized storage area for programs , data, and information

2.2.4. Advantages users can access shared data which is centrally controlled all files are stored in a central location

2.2.5. Disadvantage the server is expensive to purchase a specialist network operating system is needed

2.3. Peer-to-Peer

2.3.1. Equal permissions and responsibilities for processing data

2.3.2. allow user to share resources and file located on their computers

2.3.3. Advantages no need for a network operating system does not need server no need for specialist staff such as network technicians

2.3.4. Disadvantage files and folders cannot be centrally backed up slow down the performance for the user

3. Classification of Network

3.1. A computer network can be classified into different categories


3.2.1. A network that connects computers and devices in a limited geographical are such as closely position group of buildings

3.2.2. Advantages easy to share devices easy to share data cost of LAN setup is low

3.2.3. Disadvantages Area covered is limited security-each computer can reduce speed for each


3.3.1. A network that covers a large geographical area such as city

3.3.2. The internet is example of world's largest WAN

3.4. Different between LAN and WAN

3.4.1. LAN - lowest in distance and complexity

3.4.2. WAN - longest in distance and complexity