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Question :
(a) "Pulse Code Modulation (PCM), as used in telephony, samples a signal at 8 kHz using 256 quantization levels". Outline how this scheme works with the help of sketches and, by reference to the Nyquist's Theorem, explain how the sampling rate was chosen.
(b) Provide advantages that digital transmission has over analogue transmission.
(c) Describe types of communication impairments that you are familiar with and, with reference to a standard communication model, state where the above-mentioned impairments usually occur.
(d)
I. Data is to be transmitted using a modem at 9600 bits per second. Calculate the minimum bandwidth of a transmission system that uses 8- level signalling.
II. For the above data rate to be achieved at the above bandwidth, use Shannon's Theorem to calculate the allowable signal to noise ratio in decibels.
ADDRESS RESOLUTION WITH CLOSED-FORM COMPUTATION For networks use reliable addressing, it is possible to select an address that creates closed-form address resolution possible.
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(a) Describe the concept of zero knowledge proofs. Give a practical example. (b) Explain how a one way hash function works. (c) What are message authentication codes? (d)
MegaCorp INC. is a large manufacturing firm that operates 5 factories in Dallas, 4 factories in Los Angeles, and 5 factories in Albany, New York. It operates a tightly connected
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Discuss how developers should apply the following countermeasures to improve the security of their code:
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(a) Describe briefly the difference between flow control and congestion control in relation to a connection-oriented protocol such as TCP. (b) What is the initial rate of data
Stateless Packet Filtering Stateless or static packet filtering is the most straightforward kind of packet filtering that allows or disallows data transfer based on the addres
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