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CIE iGCSE Computer Science > Data transmission > Flashcards

Data transmission Flashcards

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1
Q

What are the parts of a data packet?

A

Packet header
Payload
Trailer

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2
Q

What does the packet header contain?

A

Destination IP address
Sender’s IP address
Packet number

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3
Q

What are the steps of packet switching?

A
  1. Data is broken into packets and given a sequence number
  2. Each packet will take a different route to the next depending on the quickest route
  3. The router controls the route that the packet takes
  4. When packets arrive, they are reordered based on their packet number
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4
Q

What is serial transmission?

A

Data bits are sent one at a time down one cable at high speeds

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5
Q

What is serial transmission used in?

A

USB

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6
Q

What are the disadvantages of serial transmission?

A

Lower transmission speeds

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7
Q

What are the advantages of serial transmission?

A

Lower interference
More reliable over long distances
Smaller, cheaper connections to produce

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8
Q

What are the advantages of USB?

A

Backwards compatible
Cannot be inserted upside down
Do not need an additional power source ~ 5V power
Industry standard

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9
Q

What are the disadvantages of USB?

A

Only supports cable lengths of 5m
Slower data transfer speeds
Limitations of backwards-compatability

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10
Q

What is parallel transmission?

A

Several bits of data sent simultaneously across several wires

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11
Q

What is parallel transmission used for?

A

Printer cables or internal device connections

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12
Q

Disadvantages of Parallel transmission?

A

Data corruption commonly occurs over long distances
Skewing
Can only be used for short distances

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13
Q

What is skewing?

A

When data bits travel parallel to each other can move at different speeds causing them to arrive out of sync

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14
Q

Advantages of Parallel transmission?

A

Very fast data transfer
Can send data in both directions at the same time

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15
Q

What is simplex transmission?

A

Data travels only in one direction down a single cable

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16
Q

What is an example of simplex transmission?

A

Sending data from the computer to a monitor as it never needs to go the other way

17
Q

What is half-duplex transmission?

A

Data can travel in both directions along a single cable, but not simultaneously

18
Q

What is an example of half-duplex transmission?

A

Printer parallel cables
Text is sent to a printer, and the printer can send ‘Out of paper’ messages back; but only when the computer has finished sending text

19
Q

What is duplex transmission?

A

Data can travel in both directions simultaneously using two communication channels

20
Q

What is an example of duplex transmission?

A

Networking or Internet cables to transmit and receive at the same time

CIE iGCSE Computer Science (15 decks)

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