Consider an application that transmits data at a steady rate (for example, the s
ID: 3881390 • Letter: C
Question
Consider an application that transmits data at a steady rate (for example, the sender generates an N-bit unit of data every k time units, where k is small and fixed). Also, when such an application starts, it will continue running for a relatively long period of time. Answer the following questions, briefly justifying your answer:
a. Would a packet-switched network or a circuit-switched network be more appropriate for this application? Why?
b. Suppose that a packet-switched network is used and the only traffic in this network comes from such applications as described above. Furthermore, assume that the sum of the application data rates is less than the capacities of each and every link. Is some form of congestion control needed? Why?
Explanation / Answer
a)
Consider the transmission of data is done at steady rate and runs continuously for relatively long period of time
The circuit switching is useful technique in implementing telecommunication network where two
nodes establish a dedicated channel in the network before the nodes communicate with each
other.
The circuit switching network is well suited for the application.
The application involves in long sessions and the bandwidth is xed because the transmission
is carried out at steady rate.
As the transmission rate is known and the application does not transmit the data in small
amounts of time the bandwidth can be reserved for each session without any previous delays.
The overhead costs in setup and tear down connection phases are put off over the lengthy
durations in a typical application session.
b)
Packet switching groups all the transmitted data into suitably sized blocks called as Packets. The
packets are shared across many communication sessions.
In packet switching network, the applications transmit over one or more links simultaneously.
Each link has a suitable bandwidth capacity to handle the sum of all application data rates.
The congestion will not take place and no form of congestion control mechanism such as queuing is needed. This is because of the sufcient bandwidth of the link in handling the data of the application.
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