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분야
pptx2.Communications Networks
3.The Global Internet
4.The Wireless Revolution
Network Interface Device
NIC
(Network Interface Card)
Most personal computers today have this card built into the motherboard.
It can be linked with a telephone wire, coaxial cable, or radio signal,in the case of cell phone and wireless-local area networks (Wi-Fi networks)
NOS
(Network Operating System)
software : Microsoft Windows Server, Linux, Novell Net Ware
Connection Point (between the computers)
Hubs
Simple devices that connect network components, sending a packet data to all other connected devices
Switch
Switch can filter and forward data to a specified destination on the network.
Router
Communication processor used to route packets of data through different networks, ensuring that the data sent gets to the correct address
Analog signal is represented by a continuous wave form that passes through a communications medium and has been used for voice communication.
Analog devices : Telephone handset, Speaker on computer, iPod earphone
Digital signal is a discrete, binary waveform, rather than continuous waveform.
- Digital signals communicate information as 0 bit and 1 bit.
Modem is a device to translate digital signals into analog form.
Web 1.0 let us obtain access to information
Web 2.0 let us share that info with others
Web 3.0 all digital info, all contacts patterned into single meaningful experience
Semantic Web (semantic~ meaning)
