Fichas
computing revision
Fichas del conjunto (34)
- 1what is the accumulator?the accumulator stores intermediate results of calculators
- 2what is the program counter?holds the memory address of instruction of the instruction
- 3what is MAR?memory address register holds the memory address of any instruction about to be used
- 4what is the MDR?memory data register holds the actual data or instruction this may have been fetched from memory
- 5what is a parameter ?a variable that a sub program requires in order to run it's only defined within the sub program
- 6what is HTTP?used by web browsers to access websites and communicate with web servers
- 7what is HTTPS?a more secure version of HTTP it encrypts all information sent and received
- 8what is FTP?used to access edit and move files between devices on a network
- 9what is POP3?used to retrieve emails from a server the server holds the email until you download it then it is deleted from the server
- 10what is IMAP?used to retrieve emails from a server the server holds the email until you actually delete it. you only hold a copy.
- 11what is SMTPit's used to send emails
- 12what do left shifts do?multiply a binary number for every shift the number is doubled
- 13what do right shifts do?divide a binary number for every shift the number is halved
- 14what is each hexadecimal character equal toone nibble in binary
- 15what is A in denary10
- 16what is F in binary?1111
- 17what is the colour depth?the number of bits used for each pixel
- 18what are character sets?collections of characters that a computer recognises from their binary representation
- 19what is lossy compression?permanently removing data from the file which limits the number of bits the file needs and so reduces its size
- 20what is lossless compression?temporarily removes data to store the file and then restores it to its original state when opened
- 21what types of files use lossy compression?MP3(audio)
AAC (audio)
JPEC (images) - 22what types of files use lossless compression?FLAC (audio)
ZIP (files and folders)
PNG (images) - 23how do you calculate file size?sample rate (Hz)* bit depth* length (s)
- 24what is a NIC?an internal piece of hardware that allows the device to connect to a network
- 25what is the purpose routers?hardware that transports data between networks and directing data to their destination
- 26what is the purpose of switches?connect devices on a LAN and receive data from one device and transmit this data to the device on the network with the correct MAC address
- 27what is a client server network?managed by a server all devices connected are clients. data is stored centrally
- 28what is a star topology?all the devices are connected to a central switch or server that controls the network
- 29what is a mesh topology?all devices are directly or indirectly connected to each other without a central point
- 30what is network protocols?a set of rules for how devices communicate and how data is transmitted across a network
- 31what are MAC addresses?6 hexadecimal numbers 48 bits
- 32what are IP addresses4 sets of denary numbers either 32 bit
or
128 bit hexadecimal - 33what is a DNSdomain name server
- 34what is DNS used forto translate website domain names into IP addresses
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- Fichas sobre computing revision, creado por Kiara Chappell el 21/10/2024.
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- Kiara Chappell
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