computer science

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what is the purpose of the CPU?
executes program instructions, performs calculations and comparisons.
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what are the 4 components of von neumann archetechture?
memory address register (MAR), memory data register (MDR), program counter (PC) and accumulator.
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what is the purpose or the memory address register (MAR)?
stores the location to be accessed next. data will either be read or written to it.
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what is the purpose of the memory data register (MDR)?
stores the data itself that has either just been read from memory or is about to be written to it.
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what is the purpose of the program counter(PC)?
contains the memory location of the next instruction to be accessed between instructions, the contents of this register are incremented.
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what is the purpose of the accumulator?
it stores the results of the calculations performed by the ALU.
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what is the http? and what does it stand for?
hyper text transfer protocol. used by we browsers to access websites and communicate with web servers
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what is the IMAP? and what does it stand for?
internet message access protocol. used to retrieve emails from a server. used by most most we based email clients.
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what are the 4 layers?
layer 1-data link layer, layer 2-network layer, layer 3-transport layer, layer 4-application layer.
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what does layer 1 do?
passes data over physical network. it is responsile for how the bits are sent as electrical signals over cables, wireless and other hardware.
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what does layer 2 do?
makes communications between networks, directing data packets and handling traffic. used by routers.
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what does layer3 do?
controls data flow e.g. splitting data packets and checking packets are correctly sent and delivered.
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what does layer 4 do?
turns data into websites and other applications and vice versa.
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why use layers?
Breaks down communication in to manageable chunks.
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Other cards in this set

Card 2

Front

what are the 4 components of von neumann archetechture?

Back

memory address register (MAR), memory data register (MDR), program counter (PC) and accumulator.

Card 3

Front

what is the purpose or the memory address register (MAR)?

Back

Preview of the front of card 3

Card 4

Front

what is the purpose of the memory data register (MDR)?

Back

Preview of the front of card 4

Card 5

Front

what is the purpose of the program counter(PC)?

Back

Preview of the front of card 5
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