Advanced Data Communications Principles - IT Assignment Help

Assignment Task

Aim: This assignment is designed to help you improve your critical thinking and problem solving skills, as well as your information literacy skills (i.e. the ability to select and organise information and to communicate it effectively and ethically).

1. Using CRC-8 with generator g(x) = x8 + x2 + x + 1, and the information sequence 1000100101.

(a) Find the (18, 10) codeword (i.e., codeword is 18 bits, where the message is 10 bits) corre-sponding to the preceding information sequence.
(b) Suppose that the codeword is transmitted with no error. Demonstrate how the receiver extracts the message from codeword?

(c) Prove that this generator enables to detect single bit errors.
(d) Assuming that the system detects up to 2-bit errors (i.e., one-bit error, or two-bits error can be detected), and let the receiver knows there is a single bit error in the transmission. Can the receiver detects the error bit, and thus, obtain the correct message? Defend your answer.

2. For dataword 1001 (which is represented as x3 + 1) and the divisor 1011 (which is represented as x3 + x + 1), the sender calculates a (7, 4) CRC codeword 1001110 and sends it to the receiver.
(i) Because of the noise in transmission medium, however, the receiver receives 1100010. Discuss whether or not the receiver accepts the codeword? If yes, is the accepted data correct?
(ii) Is it possible that the codeword be modified, but the receiver obtains a correct data? If yes, give your argument and provide such a modified codeword.

3. An organization is granted a block of addresses with the beginning address 140.42.74.0/24. the organization needs to have 3 blocks of addresses to use in its three subnets: one subnet of 12 addresses, one subblock of 55 addresses, and one subblock of 125 addresses.
(i) Design the subblocks. Determine the first address and last address in each block, using binary, dotted decimal, and Hexadecimal notation.
(ii) How many addresses are left in reserve?

4. For the above question, calculate the header checksum.

5. In a network using the Go-Back-N protocol with m = 3 and the sending window of size 7, the values are Sf = 42, Sn = 46, and Rn = 44. Assume that the network does not duplicate or reorder the packets.
(i) What are the sequence numbers of data packets is transit?
(ii) what are the acknowledgment numbers of data packets in transit?

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