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Question:
(a) For the bit stream 010011, sketch the waveforms for each of the code indicated.
Assume the following: the signal level for the previous bit for NRZI was a 1 and was positive; the most recent preceding 1 bit (AMI) had a negative voltage; and the most recent preceding 0 bit (pseudoternary) had a negative voltage. (Let 0 be positive for NRZ-L)
(b) Describe fully how you can use a (11/7) Hamming code to:
(i) detect and;
(ii) correct by giving the correct transmitted character;
if an incorrect codeword representing character "K" is received:
(ASCII value of "K" is 75)
(c) Describe the procedure known as byte stuffing. Explain why and when it is used and how it actually works.
(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
Problem (a) Distinguish between passive and active attacks. (b) Give two reasons why it is important to organise security awareness programs for users. (c) Describe how
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which is best algorithm
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802.11 WIRELESS LANs AND CSMA/CA: IEEE 802.11 is standard wireless LAN that needs radio signals at 2.4GHz. Its speed is 11Mbps. The older computers use radio signals at data
Hashing is the transformation of a string of characters into a generally shorter fixed-length key or a value that presents the original string. Hashing is used to index and retri
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