Q. Justify disadvantages and advantages of packet switching over circuit switching?
Ans:
Comparison of circuit switching and packet switching showing disadvantages and advantages of packet switching over circuit switching is as follows:
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Circuit Switching
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Packet Switching
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Dedicated transmission path.
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No dedicated transmission path
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Transmission of data.
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Transmission of packets.
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Operate in real time.
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Near real time.
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Message not stored.
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Message held for short time
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Path established for entire message.
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Route established for each packet
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Call setup delay.
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Packet transmission delay.
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Busy signal if called party busy.
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No busy signal.
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Blocking may occur.
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Blocking cannot occur
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User responsible for message-loss protection.
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Network may be responsible for each packet but not for entire message.
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No speed or code conversion.
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Speed and code conversion.
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Fixed bandwidth transmission.
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Dynamic use of bandwidth.
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No overload bits after initial setup delay.
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Overload bits in each packet.
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