Networks - Networks AnIntroduction Themorethemerrier!...

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Networks An Introduction
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The more the merrier! Computer networks Connect 2 or more computers to each other Facilitate communications Enable the sharing of hardware Enable the sharing of data Facilitate information preservation
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Networks:  How do they work? Hardware (architecture): computer cables, switches, modem / fax modem modem: signal modulation/demodulation network interface card (NIC) Software : peer-to-peer client-server communications software Protocols: standards of communicating between modems, across networks Communication Modes : asynchronous - data sent one bit at a time, in series, with start and stop bits; allows for two-way transmission
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Protocols Standards that specify: format of data being transferred rules to follow in transmitting data Computers need to ‘speak’ the same language in order to communicate; both systems must follow the same protocols Data transfer rate measured in bps if modems have different transfer rates, the slower of the two is used
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Communication Synchronous Requires both sender and receiver be active at the same time Asynchronous Sending and receiving occur at different times Examples?
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Communication Broadcast communication Single sending and many receivers Multicast if many receivers but the list is selective Point-to-Point communication One sender and one receiver
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Switching Techniques:  Circuit / Packet Circuit switching connection used exclusively by sender and receiver
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Networks - Networks AnIntroduction Themorethemerrier!...

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