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Questions and Answers
What is an advantage of serial transmission over parallel transmission?
What is the main difference between simplex and half-duplex transmission?
Which type of transmission sends all bits in a byte simultaneously?
What is a benefit of using parallel transmission?
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What is full-duplex transmission?
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Why is it efficient to not send data where it is not required?
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What is the main characteristic of circuit switching in a computer network?
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What is an advantage of packet switching over circuit switching in terms of network failure?
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What happens to packets in packet switching if they arrive out of order?
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Why is packet switching preferred in terms of security?
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What is the purpose of switching in a computer network?
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What is a characteristic of packet switching in a computer network?
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What is an advantage of packet switching in terms of data line usage?
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What is the main difference between circuit switching and packet switching?
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Study Notes
Data Transmission Modes
- Circuit switching: a path is set up between the sender and receiver before transmission, and all data follows the same path, in order.
- Circuit switching: the path cannot be used by any other data during transmission.
Packet Switching
- Data is split into packets before transmission.
- Each packet may be transmitted by different routes through the network.
- Packets may arrive out of order and are reassembled on arrival.
- Advantages of packet switching:
- Better security as it is very difficult to intercept and reconstruct packets.
- Makes more efficient use of data lines as there is no waiting during gaps.
- Less likely to be affected by network failure because multiple paths are used.
Switching in a Computer Network
- Switching sends data along the appropriate path.
- Switching prevents all the data being sent to all parts of the network.
- It requires less bandwidth and is more efficient not to send data where it is not required.
Serial and Parallel Transmission
- Serial transmission:
- Data is sent bit-by-bit along the same data line.
- Advantages:
- Requires only two wires compared to 8 or 16 in parallel.
- Can travel longer distances than parallel.
- Simpler interface/circuit board.
- Parallel transmission:
- All bits in a byte are sent simultaneously along separate data lines.
- Advantage: transmission is faster than serial transmission.
Data Transmission Directions
- Simplex: data transmission is possible in one direction only along a computer network/pathway/cable.
- Half-duplex: data can be sent in either direction, but only in one direction at a time.
- Full-duplex: data can be sent in either direction, in both directions at the same time/simultaneously.
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Description
Compare and contrast circuit switching and packet switching in computer networks, highlighting the advantages of packet switching. Practice with past paper questions from Jan 2012.