Direction: Consider three IP networks A, B and C. Host HA in networks A sends message each containing 180 byte of application data to a host HC in network C. The TCP layer prefixes a 20 byte header to the message. This passes through an intermediate network B. The maximum packet size, including 20 byte IP header, in each network is
A : 1000 byte
B : 100 byte
C : 1000 byte
The network A and B are connected through a 1 Mbps link, while B and C are connected by a 512 kbps link (bps = bits per second).
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What is the rate at which application data is transferred to host HC ? Ignore errors, acknowledgements, and other overheads.
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- 325.5 kbps
- 354.5 kbps
- 409.6 kbps
- 512.0 kbps
- 325.5 kbps
Correct Option: B
The Nyquist theorem, also known as the sampling theorem, is a principle that engineers follow in the digitization of analog signals. For Analog-to-Digital Conversion (ADC) to result in a faithful reproduction of the signal, slices, called samples of the analog waveform must be taken frequently. The number of samples per second is called the sampling rate or sampling frequency. Hence, by ignoring errors. i.e., noise so B = 2H (Nyquist theorem) Here, the maximum data transferred = 180 kb
⇒ B = 2 ´ 180 = 360 kbps ≈ 354.5 kbps
