Worksheets3. Hardware - Data Storage: Computer Science CIE IGCSE
Total questions: 69
Worksheet time: 43mins
DVDs have the potential for Dual Layering
True
False
What are DVD and Blu-ray layers joined with?
Transparent polycarbonate spacers
Very thin reflective layers
Indium tin oxide
Glass Substrate
How much more data can Blu-Ray store than DVD?
Up to 5 times more
double
Triple
Up to 12 times more
Automatically comes with a secure encryption system, helping prevent copywrite and hacking
Blu-Ray
CD
DVD
What is Blu-Ray track pitch?
0.3 µm
1.2 µm
0.74 µm
What is DVD track pitch?
0.3 µm
1.2 µm
0.74 µm
What is possible on a Blu-Ray Disk?
Change the read/write head direction
Record HD TV
Skip quickly to any part of the disk
Embed defragmentation software
Create playlists of recorded movies and TV
What is possible on a Blu-Ray Disk?
Use it as RAM
Edit/re-roder programs
Automatically search for empty disk space to avoid over-recording
Access websites
Download subtitles
Can be used as backup
CD
DVD
Blu-ray
How many layers can Blu-Ray have? (MAX)
1
2
3
4
Describe CD-ROM / DVD-ROM
Read only
Burned at manufacture
Empty initially
Can be written to around 1000 times
Describe CD-R / DVD-R / Blu-Ray-R
Can be written to once
Burned at manufacture
Empty initially
Can be written to around 1000 times
Describe CD-RW / DVD-RW / Blu-Ray-RW
Can be written to once
Concentric Track
Empty initially
Can be written to around 1000 times
Describe DVD-RAM
Can be written to once
Concentric Track
Can be simultaneously written to and read from.
Can be written to around 1000 times
Give examples of offline storage
RAM
ROM
DVD
CD
Blu-Ray
Give examples of offline storage
RAM
ROM
DVD
CD
Blu-Ray
Give examples of offline storage
RAM
SSD
USB-RAM stick
Magnetic tape
What are advantages of virtual memory?
Programs larger than physical memory can still be executed.
Memory isn't wasted with data that isn't bein used.
Reduces the need to buy and install expensive RAM memory
Prevents system crash
Reduces the risk of disk thrashing
What is a disadvantage of virtual memory?
(a)
A fixed-length consecutive block of data utilised in virtual memory systems
Word
Website
Page
Virtual Memory
What can disk thrashing lead to?
Premature failure of the HDD
System crash
Thrash point
Operation failure
How can you reduce disk thrashing?
Installing more RAM
Reducing number of simultaneously running programs
Reducing swap file size
Using SSD over HDD
Reducing use of Virtual Memory
A method of storage where data is stored on a remote server
Cloud storage
Virtual Memory
Secondary Storage
Tertiary Storage
Why is the same data stored on more than one server in cloud storage?
In case of maintanence
In cace of repair
In case of tragedy
Disaster-proof
What is an advantage of data redundancy?
The user can access their data all the time
The user doesn't have to be online to access their data
The user can store more data
Reduces the risk of disk thrashing
The condition created when the same piece of data is stored in more than one place.
Virtual memory
Cloud storage
Secondary Storage
Data redundancy
What is a cloud's physical environment managed by?
The user
A hosting company
A university
The government
How many types of cloud storage are there?
(a)
What are the 3 types of cloud storage?
Physical cloud
Virtual cloud
Public Cloud
Private cloud
Hybrid cloud
A storage environment where the customers and cloud provider are different companies:
Public cloud
Private cloud
Hybrid cloud
Storage provided by a dedicated environment behind a firewall. Customer and provider are integrated and operate as a single entity.
Public cloud
Private cloud
Hybrid cloud
A combination of public and private cloud. Some data resides in private cloud and other less sensitive data can be accessed by a public cloud storage provider.
Public cloud
Private cloud
Hybrid cloud
What are advantages of cloud storage?
Offsite backups improve security
Data can be accessed anywhere by logging into the internet
Large capacity for a lower price than buying your own storage
Data can be accessed offline
Data can be accessed anywhere
What are advantages of cloud storage?
Pay for what you use
Security dealt with by cloud provider
Can be directly accessed by any device
Your data cannot be misused
Minimises risk of loss of backup data.
What are advantages of cloud storage?
Easy to add storage capacity
Lower capital outlay
Data can be quickly analysed
No need to carry around an external storage device.
Data can be put into database
What are advantages of cloud storage?
Allows data recovery despite HDD failure.
Data easily shared
Person data is shared with has immediate access
Makes collaboration easier
Data can be quickly downloaded
What are disadvantages of cloud storage?
Data flows across country borders, so it is hard to establish which laws apply to travelling data.
Your confidential data is being kept by someone else, who could use/hack it.
Hackers could steal your data, as you can't be sure your cloud provider is secure.
Difficult to access data
Expensive for what you get
What are disadvantages of cloud storage?
If your data is misused, it is difficult to prosecute someone in another country.
Many places do not have good internet access
Slow/unstable connections can lead to trouble accessing data.
Requires a wifi connection
Has a complicated interface.
What are disadvantages of cloud storage?
Costs can be high if a large storage capacity is needed.
Potential failure of the cloud storage company poses a risk of losses of backup data.
Slower than SSD
Uploading/
downloading files can be difficult without a fast internet connection
Difficult to set up.
What does NIC stand for?
Nick
Network Interface Card
Network Internet Connection
Nicean Independant Creed
Why does a computer need an NIC?
In order to access a network
In order to access the internet
In order to transalate IP addresses
In order to obtain a fast WIFI connection
What does WNIC stand for?
Wired Network Interface Card
Wireless Network Internet Connection
White Nothing Industrial Centuaries
What do WNICs use to communicate with networks?
Antennae
Microwaves
USBs
Ethernet connection
When is a MAC address assigned?
At the point of manufacture
Whenever the device connects to a network
What is the MAC address written in?
Hexadecimal
HTML
Binary
Denary
Python
What describes a MAC address?
48 bits
16 bits
6 groupes of hex digits
2 groups of 4 bytes
Takes the form NN:NN:NN:DD:DD:DD
Represents the manufacturer's code in a MAC address:
NN:NN:NN
DD:DD:DD
Represents the device serial number in a MAC address:
NN:NN:NN
DD:DD:DD
If the NIC changes, will the MAC address change?
Yes
No
What are the 2 types of MAC address?
LAA
UAA
NAA
WAN
LAN
Most common type of MAC address
UAA (Universally Administered Address)
LAA (Locally Administered Address)
Set at manufacture
LAA
UAA
Can be changed by the user
LAA
UAA
Why would a user want to change their MAC address?
It is the wrong format for certain software
It is the wrong format to bypass a MAC address filter on a router/firewall
In order to bypass network restrictions
In order to access certain information
When is a IP address assigned?
At the point of manufacture
Whenever the device connects to a network
A private IP address is unique on a network
True
False
A private IP address is unique on the internet
True
False
Based on 32 bits, written in 4 groups of 8 bits
IPv4
IPv6
Based on 128 bits, written in 8 groups of Hex digits. Colons are used between these groups
IPv4
IPv6
What is a disadvantage of IPv4?
It has a reduced number of devices and routers that can be connected at any one time.
It is longer so harder to remember
It is old fashioned
What are advantages of IPv6?
Removes the risk of IP address collisions
Has built-in authentication checks
Allows for more efficient packet routes
Easier to remember
Shorter
Identifies the global address on the internet
MAC address
IP address
Identifies the physical address of a device on a network
MAC address
IP address
What are the 2 types of IP addresses?
IPv4
IPv6
Static
Dynamic
Assigned automatically, will commonly change. Device must request this before accessing website resources
Static IP address
Dynamic IP address
Does not change, and is set manually. Computer can directly access website resources.
Static IP address
Dynamic IP address
What are advantages of static IP addresses?
Less bandwidth used
Less time taken
Cheaper
Network traffic is reduced
Device is given a consistent location
What do routers route packets between?
LANs
WANs
LAA
UAA
Where do routers sit?
Between the computer and the internet
Behind a firewall
Within the proxy
In the computer
