Past Paper Corrections

Question 1

Characteristics lossy

Answer 1

Data is permanently removed so the original file cannot be reconstructed.

Question 2

Why are there no collisions on a ring network?

Answer 2

Data packets only travel in a single direction from node to node, so there are no packet collisions.

Question 3

TCP/IP layers highest to lowest

Answer 3

Application, Transport, Network, Data Link

Question 4

What does the Application layer handle?

Answer 4

Web browsers sending request to web server

Question 5

Drawbacks of cellular phone networks

Answer 5

Some areas not covered by infrastructure & inconsistent connection due to interference.

Question 6

Describe one function of cache

Answer 6

Holds data ready for use so that it speeds up the processing.

Question 7

How can a RFID be used?

Answer 7

A hand-held receiver could be used to detect the location of a lost object

Question 8

How does technology make us a more inclusive society?

Answer 8

Provides access to services such as education & health for those with constraints

Question 9

Round rectangle

Answer 9

Start/Stop

Question 10

Parallelogram

Answer 10

Input/Output

Question 11

Rectangle

Answer 11

Process

Question 12

Rhombus

Answer 12

Decision

Question 13

Functions compiler

Answer 13

Translates high-level programming languages & generates single executable file.

Question 14

Functions interpreter

Answer 14

An error in the source code is highlighted as soon as it is encountered during execution, and translates high-level programming languages.

Question 15

Functions assembler

Answer 15

Translates low-level programming languages, One line of source code is translated to one line of machine code.

Question 16

Benefit of hacking a network

Answer 16

Security vulnerabilities are exposed to an ethical hacker.

Question 17

Describe how data is stored on optical media

Answer 17

A laser beam is used to burn pits & lands on the disc which represent 0 and 1.

Question 18

Disc-formatting program software

Answer 18

System software

Question 19

Cloud storage user responsibility

Answer 19

Choosing strong authentication credentials & not sharing these.

Question 20

Cloud storage provider responsibility

Answer 20

Encryption, backup & restore procedures

Question 21

DNS Input

Answer 21

Uniform resource locator into browser

Question 22

DNS Output

Answer 22

IPv4 address of searched website

Question 23

Layer of devices from user device to internet

Answer 23

Device, Switch, Router, Modem, ISP, Internet

Question 24

IMAP Explanation

Answer 24

Changes are synced with the mail server in real-time

Question 25

Too large binary addition

Answer 25

An overflow error occurs which can cause the program to crash or produce incorrect results.

Question 26

Benefits of embedded systems

Answer 26

Low power consumption, limited memory, can be chosen to fit just one specific task.

Question 27

Reasons for networks

Answer 27

Centralised backup & saves money on licenses

Question 28

Advantages wired

Answer 28

More secure, more bits per second, connection does not get stopped by walls & furniture.

Question 29

Disadvantages wired

Answer 29

Less portable, installation more complex, some digital devices cannot use wired

Question 30

Definition internet

Answer 30

A global network of networks

Question 31

Definition world wide web

Answer 31

Collection of web pages accessed using the internet

Question 32

Why was unicode developed

Answer 32

Standard ASCII can’t represent all major characters & symbols, but unicode can represent a very large number of characters

Question 33

How does increasing cache improve CPU performance?

Answer 33

It speeds up processing because the cache is a faster type of memory

Question 34

What is hertz?

Answer 34

Samples per second

Question 35

Code reviews benefits

Answer 35

Remove code vulnerabilities in programming languages & eliminate bad programming practices

Question 36

4 Types of legal protection for intellectual property

Answer 36

Trademark, Licensing, Copyright, Patent

Question 37

Pixel definition

Answer 37

The smallest single dot in an image

Question 38

Task carried out by network layer

Answer 38

Adds the destination IP address & moves packets onto next network node

Question 39

Why is both software & hardware needed

Answer 39

Software is the set of instructions that controls the hardware

Question 40

Why is an SSD better than other storage devices?

Answer 40

It is lighter, generates less heat & has faster access speed.

Question 41

Why are simulations used

Answer 41

To predict outcomes & to speed up or slow down simulations

Question 42

Why do simulators require powerful processors?

Answer 42

Simulations may collect large amounts of data & may involve a large number of calculations

Question 43

Describe the stored program concept

Answer 43

Instructions & data are stored in memory & fetched, decoded & executed.

Question 44

Difference between DNA & traditional computing

Answer 44

DNA uses chemical reactions rather than electrical properties