Computer Networks Answers

1. Assuming standard 1500 byte Ethernet max payloads: how many IPv4 fragments will be needed to transfer 2000 bytes of user data with a single UDP send? And, how do the 2000 bytes get split over the frags?
2. Despite its conceptual elegance, RPC (Remote Procedure Call) has a few problems. Discuss any 3 of those in brief.
3. Why is timestamping needed in real-time applications? This is in the context of Real-time Transport Protocol (RTP).
4. Why does UDP exist? Would it not have been enough to just let user processes send raw IP packets?
5. Explain how QUIC eliminates a couple of RTTs usually needed at the start of a secure web connection.

(a) AI concentrates on developing systems which enables the computer to perform human-like activities through 'reasoning' based on programmed rules. Explain how this ‘reasoning’ is factored in developing  simple expert system for medical diagnosis that is based on interview and for suggesting a list of ten common drugs.

my number is 1921038

Each student’s number uxxxxxxx must be converted into the format xxx.xx.xx.0/25 by applying the following procedure to obtain the student’s block IP address and mask

First IP 1. If first digit is 1 or 2 then take the first three digits as the first section of IP address 2. If first digit is 0, then take the first three digit and replace the leading 0 by 1, for the first section of IP address.

Second IP 1. Take the next 2 digits (digit 4th and 5th of your student number) the second section the IP address; 2. If both are 0s (zeros) replace them by 11 and if only the digit 4th is 0 then ignore it (i.e. do not include it in your IP address).

Third IP 1. For the third section of the IP address, take the following 2 digits (digit 6th and 7th) 2. If both are 0s (zeros) replace them by 11 and if only the 6th digit is 0 ignore it (i.e. do not include it in the IP address).

Fourth IP 1. The last section of the IP address must be zero Mask 2. Finally, the mask is /25

Plant Electronics Limited is considering producing three new computer boards on a daily basis. Each board will be produced from various combinations of plastic, copper and transistors. The amount of each resources required per unit, the unit profitability, and the availability of the resources are summarized in the following table: Chip model Plastic Copper Transistors Profit per unit GH¢ 𝑋12 2 1 1 4 T7 1 2 1 1.5 V8 1 1 1 3 Daily availability 80 80 70 (a) Formulate the linear programming problem to determine the production levels for three models X12, T7 and V8 that will maximize profit. (b)Use solver to find optimal solution and sensitivity report. c) Management have asked you to determine the optimal solution. Write your answer in a form of a report to be submitted to the management. d) A supplier is willing to offer Plant Electronic Ltd, additional amounts of the resources.

. Computer Science is no more about computers than medicine is about stethoscopes. Do you agree with this statement or not; defend your answer with practical examples.

Discuss the challenge(s) you faced whilst using the Google Meet platform for our Live Online Video Lectures for this course and what could be done about the challenge(s).