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25 Cards in this Set
- Front
- Back
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Serial transmission (2) |
Data is transferred along a single channel, one bit at a time |
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Parallel transmission |
Data is transferred along several channels, multiple bits at a time |
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Advantage of parallel transmission over serial transmission |
Data transmission is typically faster |
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Advantage of serial transmission over parallel transmission (3) |
More wires are needed, so complexity and chance of interference are higher |
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Simplex |
Data can travel in one direction only |
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Half-duplex |
Data can travel in both directions, but not simultaneously |
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Full-duplex |
Data can travel in both directions at the same time |
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Advantage of digital signals over analogue (3) |
Digital signals require less bandwidth, there is less chance of interference and can be processed by multiple other digital devices |
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Role of a multiplexer |
To manage the forwarding of multiple signals along a single communication line |
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Circuit switching (2) |
Several switches are set to create a temporary path for data. The path is maintained until the data stops being transmitted |
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Packet switching (2) |
Data being sent is split up into multiple packets of a fixed size, which may take different routes to the destination |
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Example of a packet switching network |
The Internet |
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Contents of a packet (4) |
The data being sent, source and destination addresses, a checksum and data enabling packets to be reassembled |
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What directs packets in a network? |
A router |
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Disadvantage of circuit switching |
Switches are possible causes of interference |
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Advantages of packet switching (2) |
Not affected by a failed link as there are several routes packets can take, good security as it is difficult to intercept transmissions |
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Protocol |
A set of rules governing the way in which data is transmitted between devices. |
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HTTP stands for..., and what is it? |
Hypertext Transfer Protocol, a protocol governing how hypertext is transmitted on the internet |
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POP3 stands for..., and what is it? |
Post Office Protocol Version 3, used for retrieving e-mails |
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SMPT stands for..., and what is it? |
Simple Mail Transfer Protocol, used for sending emails between servers |
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FTP stands for..., and what is it? |
File Transfer Protocol, used to transfer files between computers via the Internet |
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VoIP stands for..., and what is it? |
Voice Over Internet Protocol, allows voice communication via the internet |
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WAP stands for..., and what is it? |
Wireless Application Protocol, allows users to access information using portable devices |
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4 steps used to detect and deal with collisions on a network |
1) A device transmits data when the path is clear 2) If a collision occurs, a special signal is generated and detected by the sender 3) The sender transmits a signal to jam the transmission of any other device's signals 4) The sender waits a random period of time before re-transmitting |
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HTML stands for |
Hypertext Markup Language |
