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Packet switching

trini22
trini22 asked
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Explain the flaw in the following logic: Packet switching requires control and address bits to be added to each packet. THis causes considerable overhead in packet switching. In circuit switching, a transparent circuit is established. No extra bits are needed. Therefore, there is no overhead in circuit switching. Because there is no overhead in circuit switching, line utilization must be more efficient than a packet switching.
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Commented:
In this context, "must" does not mean "requires to be", but rather like the word "must" in "If this ball is not smaller, it MUST be bigger"
The flaw is that you completely ignored circuit setup and teardown.  There is overhead in any switching senario.  

All of these statements are incorrect or unsupported:
Therefore, there is no overhead in circuit switching. Because there is no overhead in circuit switching, line utilization must be more efficient than a packet switching.

Commented:
Repsonding to this statement: "In circuit switching, a transparent circuit is established." That is false. In circuit switching (digital switching), a transparent path is established between 2 attached devices; so that it appears that the 2 devices have a direct connection. The media that is used must support full duplex transmission. But there is no transparent circuit.

Also, there is always overhead in any network, packet switching or digital switching.
Explain the flaw in the following logic: Packet switching requires control and address bits to be added to each packet. THis causes considerable overhead in packet switching. In circuit switching, a transparent circuit is established. No extra bits are needed. Therefore, there is no overhead in circuit switching. Because there is no overhead in circuit switching, line utilization must be more efficient than a packet switching.

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