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computer science > theory dont know > Flashcards

theory dont know Flashcards

1
Q

magnetic

A
  • has platters
  • that spin
  • has read / write arm
  • magnetic field determines binary value
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2
Q

magnetic +/-

A

+ large storage
+ cheap
+ fast read / write
- not durable (lots of parts)
- sealed unit (hard to fix)
- not portable

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3
Q

optical

A
  • disk with a spiral
  • binary represented by pits and lands
  • laser shines on disk and light is reflected differently to determine binary value (read)
  • laser indents disk (write)
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4
Q

optical +/-

A

+ cheapest
+ portable
+ small
- less storage
- easily scratched / damaged

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5
Q

solid state

A
  • sends current which forces electrons through barrier
  • traps them in floating gates
  • binary data stored by held electrons
    (flash memory)
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6
Q

solid state +/-

A

+ no moving parts (durable)
+ faster read / write
+ faster start up
+ quiet
+ don’t need defrag
- expensive

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7
Q

why cloud storage grown

A
  • bandwidth increased - fast internet available
  • cheaper
  • more choice of company
  • more small portable mobil devices
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8
Q

hdd can ssd

A

hdd
- longer read / write
- cheaper for more data stored
ssd
- no moving parts (durable)
- faster read / write

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9
Q

cloud + / -

A

+ access anywhere
+ central back up
+ managed by 3rd party
+ cheaper comp
+ easy to share
- if no internet no access
- privacy of 3rd party staff
- malware /hackers
- rely on 3rd party security
- long subscription (expensive)

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10
Q

protocol layers

A

application
transport
internet
link

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11
Q

application layer

A

data encoded
HTTP
FTP
IMAP
SMTP

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12
Q

transport layer

A

connection between devices
establishes language and packet size
splits data into packets
TCP
UDP

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13
Q

internet layer

A

addresses and packets data
IP

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14
Q

link layer

A

contains network hardware
attaches MAC address
NIC
OS drivers

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15
Q

MAC address

A
  • every networked device has one
  • assigned by manufacturer
  • identifies the device (hardware)
  • never changes
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16
Q

IP address

A
  • every networked device has one
  • assigned by network
  • identifies device on a network (software)
  • can change depending on location and network
17
Q

EAN vs LAN

A
  • many location vs one
  • heavy traffic vs faster transmission
  • shared ownership vs single ownership
  • public vs private
18
Q

system vs application software

A

system
- platform for other softwares to run
- manages operation on a comp
application
- installed by user to allow them to perform tasks

19
Q

OS

A

application management
security management
storage management
input / output device management

20
Q

application management

A
  • allows download of authorised programs
  • can prevent certain apps
  • controls updates
21
Q

security management

A
  • authentication
  • blocks certain software
  • protects against malware
22
Q

storage management

A
  • manages devices
  • loads data to memory
  • manages space - over writing prevented
23
Q

input / output device management

A
  • manages devices and drives
  • handles interrupts
  • controls communication - allows sending / receiving
24
Q

data compression

A
  • smaller files - fewer packets so faster transmission and reduced traffic
  • reduced download times (streaming)
  • images on web pages download faster
  • more space on disks or servers
  • less storage is cheaper
25
Q

lossy eg

A

JPG
MP4
MP3

26
Q

lossless eg

A

PDF
PNG
GIF

27
Q

sound waves

A

analogue and continuous

28
Q

digital waves

A

discrete

29
Q

layers +

A
  • self contained - function can be changed without affecting others
  • diff hard/ software operates on each layer providing interoperability between providers/systems
30
Q

largest no. using x bits

A

2^x -1

31
Q

network +/-

A

+ file sharing
+ share hardware eg printer
+ communicate
+ log in from anywhere
+ centralised backups management and security
- cost of hardware
- cost of management
- spread of malware
- accessing data across devices (privacy)

computer science (13 decks)

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