INTERNET TECHNOLOGY (1)

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INTERNET TECHNOLOGY (1) by Mind Map: INTERNET TECHNOLOGY (1)

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

1.1.1.1. Modems - analog signal from telephone cable wire to a digital signal

1.1.1.2. Wireless Access Point(WAP) - allows computer and devices to transfer data wirelessly among themselves

1.1.1.3. Router - connects multiple computer and transmits data to its correct destination

1.1.1.4. Network Cards - electronic device that connects a computer network, use a LAN

1.1.1.5. 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

1.2.1.1. Physical/ Wired transmission media

1.2.1.1.1. Twisted-pair cable

1.2.1.1.2. Coaxial cable

1.2.1.1.3. Fiber-Optic Cable

1.2.1.2. Wireless Transmission Media :send communication signals through the air or space example radiowave

1.2.1.2.1. Infrared - send signal using infrared light wave

1.2.1.2.2. Brodcast Radio - distributes radio signala through the air over long distance

1.2.1.2.3. Cellular Radio - use for mobile communication, specifically wireless modems and mobile phone

1.2.1.2.4. Microwaves - that provide a high-speed signal transmission.

1.2.1.2.5. 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

2.2.4.1. users can access shared data which is centrally controlled

2.2.4.2. all files are stored in a central location

2.2.5. Disadvantage

2.2.5.1. the server is expensive to purchase

2.2.5.2. 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

2.3.3.1. no need for a network operating system

2.3.3.2. does not need server

2.3.3.3. no need for specialist staff such as network technicians

2.3.4. Disadvantage

2.3.4.1. files and folders cannot be centrally backed up

2.3.4.2. slow down the performance for the user

3. Classification of Network

3.1. A computer network can be classified into different categories

3.2. LOCAL AREA NETWORK(LAN)

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

3.2.2.1. easy to share devices

3.2.2.2. easy to share data

3.2.2.3. cost of LAN setup is low

3.2.3. Disadvantages

3.2.3.1. Area covered is limited

3.2.3.2. security-each computer

3.2.3.3. can reduce speed for each

3.3. WIDE AREA NETWORK(WAN)

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