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Worksheets2. Data Transmission Part 1 - Computer Science CIE IGCSE
Total questions: 53
Worksheet time: 35mins
How is data transmitted?
In data packets
In routers
By hardware
With algorithms
How large is a typical data packet?
8 bytes
64 KiB
32 MiB
16 GiB
Are data packets all sent along the same route to their destinations?
Yes
No
Data is
Broken up into data packets
Sent as a whole in a data packet
Select the three parts that make up a data packet
Header
Payload
Trailer
Data
Source
What does a packet header contain?
IP address of sender/originator
IP Address of destination
Error check
Sequence/packet number
Size of the packet in bytes
What does a packet payload contain?
IP address of sender/originator
IP Address of destination
Error check
Actual data
Size of the packet in bytes
What does a packet trailer contain?
IP address of sender/originator
IP Address of destination
Error check
End of packet identifier
Size of the packet in bytes
What controls the route a packet takes?
Routers
The Header
The payload
The trailer
What are routers contained in?
Nodes
Payload
Header
Footer
Do packets always arrive in order?
Yes
No
A method of data transmission, in which a message is broken up into a number of packets, which are each sent independently.
Packet switching
Data exchange
Data transmission
Simplex Parallel
Routers send packets
Along the shortest possible path
Along the shortest possible path available
How is the loss of packets by bouncing prevented?
(a)
What are advantages of packet switching?
No single communication line is used, so no-one can prevent data transfer.
Packets can be lost and need to be re-sent
Easy to expand routes by setting up routers.
Failed, busy, or faulty lines can be by-passed.
Error-prone
What are advantages of packet switching?
High rates of transmission possible
Rates of transmission can be controlled easily
No need to tie up a single communication line.
No delay at destination
Error-prone
What are disadvantages of packet switching?
Packets can be lost and need to be re-sent.
Rates of transmission cannot be controlled.
No need to tie up a single communication line.
Delay at destination as packets are put in correct order.
Error-prone
What are three factors that must be considered when transmitting data?
Direction of travel
Method of transmission
How data will be synchronised
Direction of synchronisation
Data packet size
What are factors to be considered when transmitting data considered by?
(a)
What are the three directions of travel?
Simplex
Parallel
Full-duplex
Half-duplex
Serial
What are the two types of data transmission?
Simplex
Parallel
Full-duplex
Half-duplex
Serial
One direction only
Simplex
Parallel
Full-duplex
Half-duplex
Serial
Both directions, but one at a time
Simplex
Parallel
Full-duplex
Half-duplex
Serial
Both directions simultaneously
Simplex
Parallel
Full-duplex
Half-duplex
Serial
Data sent through a single wire, 1 bit at a time.
Simplex
Parallel
Full-duplex
Half-duplex
Serial
Data sent through multiple wires, at least one byte at a time.
Simplex
Parallel
Full-duplex
Half-duplex
Serial
What are examples of simplex transmission?
Digital walkie-talkie
Hardware devices
Input/output devices
Computer network
Broadband internet connection
What are examples of full-duplex transmission?
Digital walkie-talkie
Hardware devices
Input/output devices
Computer network
Broadband internet connection
What is an example of half-duplex transmission?
Digital walkie-talkie
Hardware devices
Input/output devices
Computer network
Broadband internet connection
Is serial cheaper or more expensive than parallel?
Cheaper
More expensive
Which type of data transmission works well over long distances?
Serial
Parallel
What distance is the furthest data can be transmitted by serial transmission?
(a)
What distance is the furthest data can be transmitted by parallel transmission?
(a)
In which type of data transmission does the data arrive fully synchronised?
Serial
Parallel
Bits can get skewed in...
Serial transmission
Parallel transmission
Which is faster?
Serial transmission
Parallel transmission
Which is easier to program/output operations with?
Serial transmission
Parallel transmission
Which can handle large amounts of data?
Serial
Parallel
A USB is....
A form of serial data transmission
A form of parallel data transmission
What does USB stand for?
Universal Serial Bus
Unicode Search Bitmap
Unicorn State Breach
Unconditional Search Biometrics
What sort of data transmission does USB allow?
Simplex
Half-duplex
Full-duplex
How many wires does a USB have?
(a)
Select the USB wires:
+5V
-5V
Ground
Data +
Data -
What colours can the +5V wire be?
red
orange
green
white
black
What colours can the Data+ wire be?
red
orange
green
white
black
What colours can the Data- wire be?
red
blue
green
white
black
What colours can the Ground wire be?
red
blue
green
white
black
The computer automatically detects the USB when it is plugged into the port.
True
False
What happens when you plug a USB into a USB port?
If the device is recognised, the appropriate device driver software is loaded.
If the device is not recognised, the user is prompted to download the appropriate device driver.
If the device is recognised, the user is prompted to download the appropriate device driver.
If the device is not recognised, the appropriate device driver software is loaded.
What is the maximum cable length of a USB?
(a)
What data transmission rates can a USB support?
1.5 Mbps - 5 Gbps
0 Mbps - 10 Mbps
20 Pbps
2 Kbps - 45 Kbps
USBs charge devices as well as transferring data
True
False
USBs have fast data transfer compared to Ethernet
True
False
