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Published byEthelbert French Modified over 9 years ago
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1 6 Further System Fundamentals (HL) 6.4 Further Network Fundamentals
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6.4.3 Network Protocols
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3 How to transmit Data can be transmitted according to a fixed time sequence, like a clock (synchronous), or special bytes can be used to mark the end of a burst (asynchronous transmission).
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4 Serial vs. parallel These methods use serial transmission (one bit is sent down the cable at a time). Parallel transmission is faster as many bits can be sent down a multi-cored cable at the same time (only possible over short distances though as the bits in a parallel byte can get out of step).
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5 Serial vs. parallel Serial is generally preferred as it is easier to implement, allows full-duplex (parallel can only be half-duplex) and permits longer cables. USB = universal serial bus.
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6 Protocols All communications are covered by agreed sets of rules or protocols. They define things such as transmission speed (baud rate), parity checking methods, asynchronous or synchronous transmission, etc.
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7 An example Modern ethernet networks use TCP/IP as their protocol, as does the internet. TCP controls how applications communicate and the disassembly/reassembly of packets. IP is the packet switching protocol that directs packets over the network.
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8 IP addresses As part of IP, each node is given its own address (4 x 8-bit numbers) e.g. 92.103.170.189. This is hierarchical (the first number gives general region, etc.). URLs must be translated into IP addresses by DNS servers (they translate intst.eu into 92.103.170.189).
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