Computing Rev 0.0 / 5 ? ComputingComputer systemsGCSEOCR Created by: roshan231Created on: 08-01-19 19:10 ALU arthritmic and logic unit: Where the instructions are copied to for calculations and logical decisions 1 of 29 CU Control unit: Resposible for decoding instructions 2 of 29 Accumulator A Register which stores any calculations done by the ALU 3 of 29 Program counter Keeps track of the memory location for the next instruction to be dealt with 4 of 29 Memory address register Stores the location in memory to be used: Where to locate data that needs to be fetched 5 of 29 Memory data register Store any data fetched from memory. or data being transferred to memory 6 of 29 Fetch Program counter copied to mar, CU locates and fetches 7 of 29 Decode CU decodes in the MDR 8 of 29 Execute The instruction is executed; e.g data is loaded to memory data register or a calculation is copies to the ALU to be solved 9 of 29 Secondary Storage Long term non-volatile storage devices such as Hard disk, optical etc 10 of 29 ROM Non volitile very small storage, keeps things like the bios. user and program cannot change the rom 11 of 29 Cloud Advantages; 1.Can be backed up safely 2.Cost- no need for a actual device 12 of 29 Cloud disadvantages; 1.Internet connection required or no access to files 2.may not have as much storage as you need for a real device 3. possible security threat 13 of 29 RAM Fast memory transers, is volitile, more ram more proformance 14 of 29 embedded systems Systems thats cannot be altered that are programmed to do one specific task 15 of 29 What is a LAN? Local Area network based in a small geographical area 16 of 29 What is a WAN? Wide Area Network based in a large geographical area such as the internet 17 of 29 How does packet switching work? 1. TCP splits packets 2.IP The different segments take different routes to the destination. 3.TCP re-assembles packet at destination in correct order 18 of 29 TCP Internet protocol which organises How packets work 19 of 29 IP Address Every decive has a IP address. it helps for when packets are routed using the ip on a wide area network 20 of 29 MAC This address is used to route frames on a local area network 21 of 29 What are the layers in networking protocols used for? They break the whole complex situation into diferent layers wich can be individually worked on and can interact with each other 22 of 29 :Name the layers and what they do: A_T_I_N Layer 1; applications-Making sure data is in an appropriate format 23 of 29 Layer 2 Transport: establishing a connection as well as agreeing the details for the format of the packets 24 of 29 Layer 3 Internet; establishing a path from sender to reciver across different networks 25 of 29 Layer 4 Network- converting the data to electrical signals to the local physical network 26 of 29 Data Protect Act 1988 This act protects all your private data so only you can decide who does and doesn't have access to it 27 of 29 Computer misuse act 1990 "hacking" or gaining access of unauthorized files is against this law and you can be put in jail for this 28 of 29 Copyright Design and Patents Act 1988 Selling of making copies and giving away software that doesn't belong to you is forbidden and you can be prosecuted this is also known as piracy 29 of 29
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