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Computer Science 1 Flashcards

Paper 1 and 2

1
Q

comp 1.5: what are the 3 types of system software

A

utility/application software, device drivers, operating software

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2
Q

comp 1.5: what does the operating system do

A

a piece of software that controls system hardware, it has mangers for each piece of hardware

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3
Q

comp 1.5: name all of the managers used by the operating system

A

memory manager, user manager, process manager, file manager

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4
Q

comp 1.5: what is a CLI

A

it is a command line interface

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4
Q

comp 1.5: what is a GUI

A

it is a graphical user interface

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5
Q

comp 1.5 what is a WIMP

A

stands for Windows Icons Mice and pull down menus, it is a system of software features designed to simplify system operation for the user

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5
Q

comp 1.5: name 4 types of utility software

A

defragmentation, encryption, compression, backup

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6
Q

comp 1.5: what is a single user OS

A

it is an operating system interned to only have a single user at a time, although more than one user can use the OS at different times, the user manager keeps track of this

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7
Q

comp 1.4: what is social engineering

A

someone being influenced into giving away info that could grant access to accounts

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8
Q

comp 1.4: what is an insider attack

A

it is an attack by someone on the inside where the give away vunerable info

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8
Q

comp 1.4: what is an active attack

A

using a technical method, such as malware or other to compromise a networks security

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8
Q

comp 1.4: what is a passive attack

A

this is an attack where attackers eavesdrop by ‘sniffing’ data packets

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8
Q

comp 1.4: what is a penetration test

A

this is where an organization performs a controlled attack on itself to identify its weak spots, this can be performed by ‘ethical hackers’

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9
Q

comp 1.4: name all of the types of malware

A

viruses - program in a program that spread
worms - code that spreads across a network without a host
trojan hoarse - pretends to be a program its not
ransomware - encrypts data on system, only decrypts when money is sent
spyware - tracks activity and gathers info
rootkit - modifies OS so antivirus does not work
backdoor - opens access to a computer that another malware takes advantage of

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10
Q

comp 1.4: what are firewalls and what do they do

A

they are either hardware or software that ‘sits’ between the user and the internet that filter packets

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10
Q

comp 1.4: what are the 4 types of active attacks

A

brute force - tries many combos of numbers and letters to find a password, this is slow
dictionary - tries many common passwords
DoS - denial of service attack, floods a server with many usless requests, can be blocked by a firewall blocking a certain ip,
DDoS - distributed denial of service attack, used to unban an ip, requests are sent from a botnet

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10
Q

comp 1.4: what methods do firewalls use to filter packets

A
  • ip filtering - the set of properties that identify a packet, together with the action to be performed on it, is known as an IP filter rule
  • packet filtering - inspects data packets to see whether they meet a certain criteria
  • port blocking - blocks certain ports that can be used by hackers to gain access, such as port 22
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11
Q

what is a protocol

A

a set of rules

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11
Q

comp 1.4 what are the 4 methods of data interception

A

MITM - a man in the middle attack intercepts data by intercepting the users connection to the internet and viewing network traffic
insider attack
packet sniffing - a hacker intercepting data transfered across a network
SQL - structured query language, this is an attack where lines of code are inserted into a field in the website/other

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11
Q

comp 1.4: what are botnets

A

they are many machines infected with malware that can be used for DDoS attacks

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11
Q

comp 1.3: what is a switch in networks

A

it is a device that connects serval devices to make a wired network

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11
Q

comp 1.3: what is a network layer

A

they break up the sending of packets into different components, each component handles a different part of the communication(TCP/IP model)

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12
Q

comp 1.3: what is a NIC

A

a network interface controller is a device that provides connection between a device and the network

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13
Q

comp 1.3: what is a router

A

this is a piece of hardware that connects networks together

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14
Q

comp 1.3: what is a wireless access point

A

a piece of hardware which connects to a switch and allows WiFi devices to connect to the network

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15
Q

comp 1.3: what is a twisted pair cable

A

ethernet cable, made of eight wires twister into pairs to reduce interference

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16
Q

comp 1.3: what is a LAN

A

local area network

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16
Q

comp 1.3: what is a client server model

A

the server is in control of the network, the client askes and it gives a response

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17
Q

comp 1.3: what is a WAN

A

wide area network

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18
Q

comp 1.3: what is a pier to pier (P2P) server model

A

this relies on each user to make sure they stay connected to the server, each pier can act as a client to the server

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19
Q

comp 1.3: what is the process of a client server model

A

first the client asks the server then the porosesses the request and then responds.

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20
Q

comp 1.3: what are the advantages of the pier to pier server model

A

cheaper, more robust, and it commonly used for streaming

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21
Q

comp 1.3: how does the internet work

A

the router provides the internet connection, it connects to a ISP (internet service provider) which then connects to a DNS (domain name service) which is the backbone of the internet

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22
Q

comp 1.3: what is the star network topology

A

all clients are connected to the central switch or server. if one client falls off all of them don’t, often used for LAN

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23
Q

comp 1.3: what is the mesh network topology

A

no central server which can fail, all of the computers are connected to all of the rest, can be very expensive if its wired, no one point of failure

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24
Q

comp 1.3: what is a partial mesh network topology

A

the same as a mesh network topology but not all of the computers are connected to all of the others

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25
Q

comp 1.3: what is WIFI

A

it is a set of protocolos that enables devices to communicate across radiowaves, there are different standards of wifi that opperate ove different frequencies and speeds, its official name is IEEE 802.11x

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26
Q

comp 1.3: what is WEP

A

wired equivalent protection is the weakest protection and is protected by one password

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27
Q

comp 1.3: what is WPA protection

A

WIFI protected access is better than WEP, it uses one password and encryption

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28
Q

comp 1.3: what is WPA2 protection

A

WIFI protected access v2 is better WPA bc it uses better encryption

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29
Q

comp 1.3: what is the IP

A

internet protocol, defines how packages should be transmitted over a wireless network, an IP header is attatched to the data to store the sourse and destination

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30
Q

comp 1.3: what is the ethernet protocol

A

this is a protocol that defines how data should be transmitted over a cable

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31
Q

comp 1.3: what is the TCP

A

transport control protocol, this splits data into small packets each with a header that defines the destination and how it reaches there

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32
Q

comp 1.3: what is the cloud

A

these are large datacentres

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33
Q

comp 1.3: what is a mac address

A

every network interface controller is has a media access control address that is globally unique and allows data to be sent to individual users

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34
Q

comp 1.3: what is a public ip address

A

routers that connect to WAN have a public ip so devices on the WAN can send data to devices on the LAN

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35
Q

comp 1.3: what is HTTP

A

hypertext transfer protocol is a protocol that determines how data is transferred between browser and web server

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35
Q

comp 1.3: what is a private ip address

A

a private ip adress is the IP for devices on a LAN to sue on that LAN

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36
Q

comp 1.3: what is FTP

A

file transfer protocol determines how binary data and text data are requested and sent to the client from the server

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37
Q

comp 1.3: what is HTTPS

A

HTTPS is secure HTTP that uses SSL (secure socket layer) in order to encrypt the data

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38
Q

comp 1.3: what is SMTP

A

simple mail transfer protocol determine how email data is sent from clients to servers

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39
Q

comp 1.3: what is POP

A

post office protocol is a protocol that determines how emails are retrieved from servers:
emails not in sync with the server
inbox is not kept consistern between devices

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40
Q

comp 1.3: what is IMAP

A

internet message access protocol is a protocol that determines how emails are retrieved from servers, it allows emails to be kept in sync, the inbox is consistent between devices

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41
Q

Comp 1.1: what is the PC and what does it do

A

The program counter is the part of the CPU that holds the address of the next instruction

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42
Q

Comp 1.1: what is the MAR

A

The memory address register is the part of the CPU that stores the memory address of where details to be stored of fetched

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43
Q

Comp 1.1: what is the MDR

A

The memory data register is the part of the CPU that holds data fetched from or to be stored to main memory

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44
Q

Comp 1.1: what is the ACC

A

The accumulator hoods the results of calculations

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45
Q

Comp 1.1: what is the ALU

A

The algorithmic logic unit performs calculations

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46
Q

Comp 1.1: what is the control unit

A

The control unit decodes instructions and signals to control how data moves around the CPU

47
Q

Comp 1.1: what does the cache do

A

Stores commonly used instructions so they are faster to execute

48
Q

Comp 1.1: what do registers do

A

Registers store small amounts of data needed for processing, they are very fast

49
Q

Comp 1.1: what are the 4 types of register in the CPU

A

MAR, MDR, PC, ACC

50
Q

Comp 1.1: what is primary memory

A

RAM

51
Q

Comp 1.1: what is BIOS and what does it stand for

A

Basic Input/Output System

52
Q

Comp 1.2: what does the rom do

A

Read only memory, this helps to wake up the computer and performs the post cycle

53
Q

Comp 1.2: what is virtual memory

A

When to computer runs out of primary storage it can make up for this with secondary storage

54
Q

Comp 1.2: what are the 3 types of secondary storage

A

Magnetic, optical, solid state

55
Q

comp 1.2: what is the difference between a full and a full incremental backup

A
  • a full backup is one that records the whole dataset
  • a full incremental takes an existing backup and replaces it with updated info
55
Q

comp: what is the DNS lookup

A

the DNS lookup is the prosess that matches ip to url so data can be transmitted between the client and website

55
Q

comp: what is a url

A

this is a uniform recourse locator and it is contains info about the location of the webpage

55
Q

comp: what is a intranet

A

a local restricted communication network

56
Q

comp: what is lossless compression and what can i be used for

A

it is a form of compression that does not diminish the quality of the media

57
Q

comp 1.2: what is lossy compression and what can it be used for

A

it is a form of compression that used and algorithm in order to compress videos and photos (not text) by removing data deemed less important

58
Q

comp 1.2: what is compression

A

it is a method that is used to reduse file size

59
Q

comp 1.2: what is bit depth in sound storage

A

it determines the number of amplitudes values can be stored per sample

60
Q

comp 1.2: what is sampling in audio storage

A

where the mic measures the audio a certain amount of times a second

61
Q

comp 1.1: what are the 4 registers in the cpu

A

MDR, MAR, ACC, PC

62
Q

comp 1.1: what 2 parts of the FDE cycle does the control unit perform

A

fetches the instruction
decodes the instruction

63
Q

comp 1.1: what 2 parts of the FDE cycle does the ALU perform

A

it gets the data for the instruction and executes it

64
Q

comp 1.1: what is the address buss

A

carries memory addresses from the processor to other components such as primary storage and input/output devices

65
Q

comp 1.1: what are the steps of the FDE cycle

A

Fetch decode execute

66
Q

comp 1.1: what does the control bus do

A

it carries control instructions

67
Q

comp 1.1: what does the data bus do

A

it carries data

68
Q

comp 1.5: what is a process manager and what does it do

A

the process manager is the manager that controls the allocation of CPU resources

69
Q

comp: what is a modem

A

the modem takes signals from the ISP and changes them into signals that your devices can understand

70
Q

comp: how do you prevent data interception

A

you use encryption to make the data safe

71
Q

comp: what is a macro

A

it is a piece of software that is given permission to run by the user

72
Q

comp: what is 2fa

A

two factor authentication, it requires to forms of authentication to provide access

73
Q

comp: what is the tcp/ip model

A

it defines how devices should transfer data between each other, divides data into packets and the combines it at the end to form the whole dataset

74
Q

comp: what do registers do

A

store small amounts of data used when processing

75
Q

comp: what does cache do

A

stores commonly used instructions

75
Q

comp: what is pseudocode

A

it is fact code that makes development easier

76
Q

comp: how much can a floppy disk store

A

100KB - 1.44MB

77
Q

comp: how much can a CD store

A

700MB

78
Q

comp: how much can a DVD store

A

standard layer (one layer) can hold 4.7GB and a double layer disk can store 8.5GB of data

79
Q

comp: how much can a blu ray disk store

A

single layer blu ray can hold 25GB and double layer can hold 50GB

80
Q

comp: how much can a caset tape store

A

lots (don’t use on exam)

81
Q

comp: how is a URL converted into a IP

A

the URL is sent to a DNS, DNS looks up the IP of the URL and sends it to the user, if it is not found the DNS sends it to a higher level DNS

82
Q

comp 1.6: what is the data protection act of 1998

A
  • it determines what companies can do with information they collect and the rights of the user to that data
  • it has 8 rules
    1. data must be used and processed in a fair an lawful way
    2. data must only be used for the stated purposes
    3. data must be adequate relevant and non excessive
    4. data must be accurate
83
Q

comp 1.6: what is the computer misuse act of 1990

A

it forbids people to access a computer without authorisation, it is also illegal to modify destroy or access data or accounts physically or through the internet

84
Q

comp 1.6: what is the copyright designs and patents act of 1988 and what is it illegal to do under the act

A

copyright affects all creative work and requires no registration
under the act it is illegal to
- make copies
- share the material
- use unlicensed software
- plagiarise creative work
patents are legal protections of work

85
Q

comp 1.6: what is the freedom of information act of 2000

A

a public body is an organisation that provides a public service
the FOI act dictates that regulatory bodies must regularly publish certain info. info that can be requested includes:
- activity logs
- financial information
- statistics
- CCTV

86
Q

comp 1.6: what is the computer misuse act of 2018

A

The Computer Misuse Act defines the following as illegal and will prosecute: Unauthorised, or malicious, access to material stored on a computer. Intentional harm, or crime, using computer systems. Modifying, removing, or ransoming data.

87
Q

comp 1.1: what happens in the first stage of the FDE cycle

A

During the first stage of the FDE cycle the instruction is Fetched from primary storage and its location stored in the MAR

87
Q

comp 1.1: what happens in the second stage of the FDE cycle

A

during the decode stage of the FDE cycle the CU interprets the instruction then code for the instruction is fetched from memory

88
Q

comp 1.1: what happens in the third stage of the FDE cycle

A

the operation is performed

89
Q

comp 1.1: what are the 3 factors that affect CPU performance

A
  • clock speed
  • cores
  • cache memory
90
Q

comp 1.3: what are 4 properties of flash memory

A
  • non-volatile
  • short lifetime
  • fast access
  • robust, it has no moving parts
91
Q

comp 1.2: what are some drawbacks of virtual memory

A
  • negative impacts on performance
  • negative impacts on health of SSD
  • there might be limited space in secondary storage
92
Q

comp 1.2: what is paging in terms of virtual storage

A

memory can be split into ‘pages’
virtual memory works by moving these pages into secondary storage when they are not in use
when they page is required again it needs to be moved back into the ram

93
Q

comp 1.2: what is 2 bits called

A

a crumb

94
Q

comp 1.2 what is 4 bits called

A

a nibble

95
Q

comp 1.2: what is 8 bits called

A

a byte

96
Q

comp 1.2: what happens when you shift binary to the left

A

you multiply by 2

97
Q

comp 1.2: what happens when you shift binary to the right

A

you divide by 2

98
Q

comp 1.2: how is a bit stored in magnetic storage

A

it is represented by a positively or negatively charged magnetic particle, these particles are part of a disk called a platter

99
Q

comp 1.2: what are 4 properties of magnetic storage

A
  • low cost
  • low speed
  • good reliability
  • high capacity
100
Q

comp 1.2: what are 4 properties of optical storage

A
  • low cost
  • low capacity
  • low speed
  • great reliability, waterproof, shockproof
101
Q

comp 1.2: what are the things that CD-R, DVD-R and BD-RW have in common

A
  • they are optical storage
  • they can only be written to once, the R part
102
Q

comp 1.2: how do you convert from binary to hexadecimal

A
  1. group the binary into 4 bits
  2. covert these bits to denary
  3. convert this number into hex
103
Q

comp 1.2: what is 1100 in hexadecimal

A

E

104
Q

comp 1.2: what is 0101 in hexadecimal

A

5

105
Q

comp 1.2: what is 101 in hexadecimal

A

5

106
Q

comp 1.2: what are 2 uses of hex

A
  • HTML colors
  • MAC address
107
Q

comp 1.2: what happens when you add binary 0 + 0

A

0

108
Q

comp 1.2: what happens when you add binary 0 + 1

A

1

109
Q

comp 1.2: what happens when you add binary 1 + 1

A

0 and carry over the 1

110
Q

comp 1.2: what are overflow errors and when do they occur

A

binary numbers are stored at a fixed length, when adding, if this length is exceeded an overflow error occurs, they lead to inaccurate results to calculations

111
Q

comp 1.2: what does ASCII stand for

A

American Standard Code for Information Interchange

112
Q

comp 1.2: how many different characters does ASCII store

A

128

113
Q

comp 1.2: what are the differences between Unicode and ASCII

A

Unicode uses can represent 32 bits and aims to represent every character in the world, even emojis, and ASCHII uses only uses 8 bits

114
Q

comp 1.3: what 4 things effect network performance

A
  • bandwidth
  • wired or wireless
  • hardware
  • topology
115
Q

comp 1.3: what is packet switching

A

it is the process of breaking down data into packets, sending them across the internet and then re-assembling at the destination

116
Q

comp 1.3: in star network topology, what are all of the clients connected to

A

server or switch

117
Q

comp 1.3: how many channels are there in the 2.4 GHz band

A

13

118
Q

comp 1.3: how many channels are there in the 5 GHz band

A

24

119
Q

comp 1.3: what is a static IP adress

A

an IP that does not change every time the device connects to the network

120
Q

comp 1.3: what is a dynamic IP adress

A

it is a device that’s IP changes every time it connects to a network

121
Q

comp 1.3: what is a public IP address

A

an IP seen on the WAN

122
Q

comp 1.2: how to convert hexadecimal 7C into denary

A

(16 x 7) + (12(C) x 1) = 124

123
Q

comp 1.2: how many colours can be stored in a 7 bit binary number

A

129

124
Q

comp 1.3: what is an ipv4 adress

A

4 max 255 digits e.g. 192.16.8.223

125
Q

comp 1.3: what is an ipv6 adress

A

IPv6 addresses are 128-bit numbers, often displayed as eight groups of four hex digits. For example: 2001 : 0db8 : 85a3 : 0000 : 0000 : 8a2e : 0370 : 7334

126
Q

comp 1.3: what is the mac adress

A

MAC addresses are represented as pairs of hexadecimal digits. For example: B8:8D:12:58:77:32

127
Q

comp 1.3 what is the role of a switch in a star topology

A
  • it connects all of the devices on the network together
  • revieves all of the data from the network
  • uses the mac adress of the devices
128
Q

comp 1.2: what frequency is cd sampled at

A

44.1 kHz

129
Q

comp 1.2: how to you calculate the size of a text file

A

text filve size = avarage bits per character x number of characters

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