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Program Counter (PC)

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Earn XP

Description and Tags

361 Terms

1

Program Counter (PC)

Holds memory address of the instruction for each cycle

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2

Magnetic storage

Hard drives

ADV: fast access, stores large amounts of data, low cost

DIS: not very portable, easily be broken

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3

Solid State storage

USB, flash memory, SD

ADV: fast, small, light, easily potable, quiet

DIS: more expensive, storage capacity less, limited number erase/write cycles

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4

Cloud storage

Data is stored on multiple servers in a remote location

ADV: secure, can be accessed anywhere, no need to buy

DIS: needs internet, download and upload can be effected by internet connection, less control if data is held

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5

Operating System

essential software that links the hardware and other software together and generally manages the computer system

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6

Utility Software

maintains a computer

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7

Defragmentation Software

reorganises data on the hard drive to put fragmented files back together and moves files to collect all the free space

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8

two types of backup software

Full Backup - a copy is taken from every file on the system

Incremental Backup - only files created or edited since last backup are copied

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9

Router

responsible for transmitting data between networks

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10

Packet Switching

split data into packets to be sent across the network, each packet given a number order of data, each router reads packet header and decides which way to send it according to IP rules, packets then arrive and reassemble them in the right order.

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11

TCP/IP

sets of rules for how devices connect on the network.

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12

Hyper Text Transfer Protocol (HTTP)

used to access websites and communicate with web servers

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13

Internet Message Access (IMAP)

used to retrieve emails, server holds until you actually delete it- only download a copy

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14

Data link Layer

passing data over physical network-

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15

Virtual Network

network that is entirely software based, created by partitioning of some physical network

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16

Malware

malicious software - computer programs designed to infiltrate and damage computers without the users consent.

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17

Trojan Horse

program which misleads users of its true intent.

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18

Adware

unwanted advertisements to the user of a computer

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19

Memory

component of the computer that holds data and programs that are currently in use

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20

Fetch

The next instruction is retrieved by CPU from main memory

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21

FDE Cycle

1. The memory address held in the program counter is copied into the MAR. then copy instruction stored in MAR to the MDR, increase PC to next instruction

2. Decoded by CU

3. Instruction is performed

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22

Cache

a type of quick memory that stores copies of frequently used data, much faster than RAM, slower than registers, lower capacity - closer to CPU

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23

Clock speed

How fast the computer does the FDE cycle

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24

virtual memory

A memory management procedure needed when the RAM is full so a temporary section is made which acts like a part of RAM

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25

Flash memory

Solid state storage, non-volatile, more reliable/durable but can only be overwritten a limited number of times

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26

Optical storage

CD, DVD, Blue-ray

ADV: cheap,easy to transport

DIS: slow, less storage than hard drives, stored data degrades over time, cannot be written over

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27

Command-line Interface

Text commands where user has to type in command

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28

Switch

connect devices on a LAN

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29

Ethernet

a set of standards for connecting computers in a LAN

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30

features of a Client-server Network

client has connection to server

servers can backup and store centrally

can be expensive and difficult to maintain

<p>client has connection to server </p><p>servers can backup and store centrally </p><p> can be expensive and difficult to maintain</p>
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31

Peer-to-peer Network

no central server, each computer equal in responsibility, have to work as both server and a client.

<p>no central server, each computer equal in responsibility, have to work as both server and a client.</p>
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32

Star Topology

ADV: better performance, rest of network not affected in one fails, simple to add more devices

DIS: wire needed for all devices, expensive

<p>ADV: better performance, rest of network not affected in one fails, simple to add more devices</p><p>DIS: wire needed for all devices, expensive</p>
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33

Mesh Topology

network is linked to one or more devices with no central point

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34

MAC Address

assigned to all devices, unique to all devises and cannot be changed, permanent, identifies the actual device.

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35

IP Address

assigned either manually or automatic, the location of your device on the internet

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36

HTTPS

more secure - encryption

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37

File Transfer Protocol (FTP)

used to access, edit and move files between devices

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38

Simple Mail Transfer Protocol (SMTP)

used to send emails, used to transfer emails between servers

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39

Layer

ADV: manageable pieces, self-contained can change without effecting others

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40

Application Layer

turning data into websites

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41

Transport Layer

controlling data flow - splitting data into packets

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42

Network Layer

making connections between networks

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43

what does the Domain Name Server (DNS) do

translates websites' domain name into its IP address

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44

Blagging

invented scenario to engage a targeted victim in a manner that increases the chance the victim will divulge information

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45

Phishing

used to gain personal information for purposes of identity theft, using fraudulent e-mail messages that appear to come from legitimate businesses.

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46

Shouldering

used to obtain information such as personal identification numbers (PINs), passwords and other confidential data by looking over the victim's shoulder.

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47

Virus

program loaded onto a user's computer without the user's knowledge and performs malicious actions. It can self-replicate, inserting itself onto other programs or files, infecting them in the process.

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48

Worm

program that replicates itself in order to spread to other computers. Often, it uses a computer network to spread itself, relying on security failures on the target computer to access it.

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49

Spyware

aims to gather information about a person or organization without their knowledge

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50

Brute Force Attack

trail and error to gain information

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51

Denial of Service Attack (DOS)

hacker stop users from accessing a part of a network, flooding network with useless traffic making computer very slow

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52

Data Interception And Theft

The unauthorized taking or interception of computer-based information. Data theft is the act of stealing computer-based information from an unknowing victim with the intent of compromising privacy or obtaining confidential information.

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53

Zero-day Attack

before software is released it is tested as much as possible

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54

Penetration Testing

organisations employ specialists to stimulate potential attacks on their network

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55

network forensics

investigation undertaken to find cause of attacks on network

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56

Anti-malware Software

designed to find and stop malware from damaging a network

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57

Encryption

data is translated into code which only someone with the correct key can access

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58

user access levels

Controls which parts of the network different groups of users can access

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59

Data Protection Act

your data should be protected and kept safe from hackers

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60

Freedom of Information Act

allows members of the public to access information held by a public organisation

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61

Computer Misuse Act

stop hacking and cyber crime - stop unauthorized access to private network

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62

Copyright Act

protect intellectual property - anything someone has created

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63

Arithmetic Logic Unit (ALU)

Performs operations on data and logic operations e.g. Addition, subtraction

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64

Control Unit (CU)

Coordinating activities of the CPU

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65

Registers

Quick, small stores of data within the CPU

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66

Memory Address Register (MAR)

Holds memory address for data or a instruction about to be used by the CPU

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67

Memory Data Register (MDR)

Holds actual data or instruction

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68

Accumulator

Stores results of calculations in the ALU

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69

Decode

The instruction is broken down and decided so computer can understand

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70

Execute

The CPU performs what the instructions told

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71

Embedded System

A computer system built within a large device e.g. Camera, washer, car

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72

Volatile

Memory loses its data when power of

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73

Non-volatile

Memory retains its data when power is lost

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74

Random Access Memory (RAM)

Read/write - function is to load open programs and operating system data currently in use - volatile

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75

Read Only Memory (ROM)

Can only be read, can't be changed, stores essential programs to be run in order to boot the computer (BIOS) - non-volatile - flash memory

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76

different levels of cache memory

L1 is quicker but has lowest capacity, L2 is slower but can hold more, L3 is slowest but largest capacity

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77

Central Processing Unit (CPU)

Processes all of the data and instructions that make the system work - can be effected by clock speed, number of cores, cache size

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78

number of cores

Each core in a CPU can process data independently of the rest.

The more cores a CPU has, the more instructions it can carry out at once, so the faster it can process a batch of data.

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79

Graphics Processing Unit (GPU)

Handles graphics and image processing

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80

Graphical User Interface (GUI)

uses icons and other visual indicators to navigate and issue commands

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81

Compression Software

reduces file size so they take up less space on hard disk

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82

Encryption Software

scrambles data to stop others from accessing it

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83

Open Source Software

source code is made freely available and users can modify it

ADV: free, ,made for greater good, can be adapted

DIS: small, buggy, security holes, no warranties, no customer support

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84

Proprietary Software

only the compiled code is released and the source code is kept a secret

ADV: warranties, well-tested, reliable, cheaper

DIS: expensive, software may not fit user needs

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85

Personal Area Network (PAN)

within the range of an individual person

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86

Local Area Network (LAN)

a network that connects devices close to each other e.g. school, house

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87

Wide Area Network (WAN)

a network within a large geographical area e.g. internet

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88

Bandwidth

amount of data that can be transferred in a given time

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89

Network Interface Card (NIC)

allow a device to connect to a network

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90

Post Office Protocol (POP3)

used to retrieve emails from a server, holds until download - then deletes from server

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91

SQL Injection

programming language used to search and query databases.

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92

Program Counter (PC)

Holds memory address of the instruction for each cycle

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93

Magnetic storage

Hard drives

ADV: fast access, stores large amounts of data, low cost

DIS: not very portable, easily be broken

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94

Solid State storage

USB, flash memory, SD

ADV: fast, small, light, easily potable, quiet

DIS: more expensive, storage capacity less, limited number erase/write cycles

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95

Cloud storage

Data is stored on multiple servers in a remote location

ADV: secure, can be accessed anywhere, no need to buy

DIS: needs internet, download and upload can be effected by internet connection, less control if data is held

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96

Operating System

essential software that links the hardware and other software together and generally manages the computer system

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97

Utility Software

maintains a computer

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98

Defragmentation Software

reorganises data on the hard drive to put fragmented files back together and moves files to collect all the free space

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99

two types of backup software

Full Backup - a copy is taken from every file on the system

Incremental Backup - only files created or edited since last backup are copied

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100

Router

responsible for transmitting data between networks

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