More Past Paper Stuff

Question 1

“How can Xander make use of file management”?
hashtag = files/folders

Answer 1

-place files in folders
rename #
move #
search for #
sort #

Question 2

do both RAm and ROM store data?

Answer 2

yup

Question 3

how can compression software compress the image file?

Answer 3

algorithm removes unnecessary data
lossy removes permanently, viceversa
reduce res
record colour changes, instead of colour
run length encoding records colour + num of consecutive pixels
Decrease colour depth

Question 4

examples of utility system software

Answer 4

Defragmentation
Encryption
Backup
Anti-virus/spyware
Firewall
Disk checker/cleaner
Auto-update
Disk formatting

Question 5

Why is the smart watch (and not the laptop) an embedded system?

Answer 5

not general-purpose
… so limited/specific function/s
built-in OS
few components, all essential to its purpose

Question 6

“Why does the camera need secondary storage”

Answer 6

for non volatile storage when device is turned off
for transferring the data

Question 7

Why are incremental backups better?

Answer 7

Less time to backup
Only does changes
software/os/settings unlikely to have changed
small num of files likely to be used between backups
each backup takes less space

Question 8

why are full backups better

Answer 8

backup all data/software
safer- more versions to revert to
faster to restore
full before incremental

Question 9

Describe how a CC license will affect others using Will’s videos (“it”)

Answer 9

Others can use/edit/share it
choose to stop others doing the above
others can’t claim as theirs
others can edit+ not reshare w/ edits (no-derivative)
attribution: he must be credited
others can’t profit

Question 10

Does this describe ethernet or wifi? “Shorter transmission range before
data is lost”

Answer 10

wifi

Question 11

Does this describe ethernet or wifi? “more likely to be affected by interference”

Answer 11

wifi

Question 12

Does this describe ethernet or wifi? “data can be transmitted at a faster speed”

Answer 12

ethernet

Question 13

Name the system which matches URLs to IP addresses on the web

Answer 13

DNS

Question 14

what is DNS

Answer 14

system that matches URLs to IP addresses on the web

Question 15

List the process of sending and recieving data packets part 1

Answer 15

request is put into packets
Each with an address+a num, sent across network
and recieved by host sever
server checks if all packets arrived

Question 16

List the process of recieving data packets part 2

Answer 16

If they don’t arrive:
send timeout to request re-send of packets
If they arrive:
order packets
web server processes request

Question 17

List threats to systems

Answer 17

virus
trojan
keylogger
malware
spyware
data interception
phishing
pharming
hacker

Question 18

What does a virus/trojan/worm/malware do?

Answer 18

piece of software that replicates itself causing damage, eg editing/deleting files

Question 19

how to avoid virus/trojan/worm/malware

Answer 19

anti malware/virus software
don’t download from unknown sources
no click on unknown links

Question 20

what do keyloggers do

Answer 20

record key presses
send 2 3rd party 4 analysis

Question 21

how to prevent keyloggers

Answer 21

antispyware/antimalware/firewall

Question 22

What is data interception

Answer 22

when data sent to another device is intercepted by a third party

Question 23

how to avoid data interception

Answer 23

encryption

Question 24

how to avoid phishing

Answer 24

network policy, firewall, education