Computer Networks Unit 2 – Link Layer and Medium Access Control: AKTU previous year questions
32 AKTU questions from Unit 2 (Link Layer and Medium Access Control) asked in 2018–2025, tagged by marks, year and topic. In short: about 38 marks of every paper come from this unit; the most asked topic is Flow Control Protocols (14 times); 28 questions came back in a later year. The latest ones are listed below; on the page you can filter them by 2-mark or long questions, topic and repeats.
Unit 2 previous year questions
- In what situations, contention-based MAC Protocols are suitable? (2 marks, 2025, Medium Access Control)
- Illustrate the concept of 'piggybacking'. (2 marks, 2025, Flow Control Protocols)
- A bit stream x8+x6+x3+x2+x+1 is transmitted using CRC method. The generator polynomial is x4+x2+x+1. Show the actual codeword transmitted at the receiver side. Suppose the third bit from left is inverted during transmission. Show that this error is detected at the receiver end. (7 marks, 2025, Error Detection and Correction)
- Illustrate the concept of slotted ALOHA with suitable diagram. Measurement of slotted ALOHA channel with infinite number of users shows that 10% of slots are idle. Calculate i) What is the channel load? ii) What is the throughput? (7 marks, 2025, Medium Access Control)
- Define fixed and variable size framing. (2 marks, 2024, Flow Control Protocols)
- Explain the working of Bridge. (2 marks, 2024, Medium Access Control)
- Explain Noisy channel Protocols with explanation and diagram. (10 marks, 2024, Flow Control Protocols)
- Define any 5 LAN standards. (10 marks, 2024, Medium Access Control)
- Explain all Random-Access protocols. (10 marks, 2024, Medium Access Control)
- Senders' data D= 110101, CRC generator polynomial=x3+x+1. Apply CRC algorithm and Perform calculations both at sender and receiver end. (10 marks, 2024, Error Detection and Correction)
- Describe piggybacking? (2 marks, 2023, Flow Control Protocols)
- If a 7-bit hamming code received as 1110101, show that the code word has error. Also, rectify error in this code. (2 marks, 2023, Error Detection and Correction)
Most asked Unit 2 topics
- Flow Control Protocols – asked 14 times
- Medium Access Control – asked 11 times
- Error Detection and Correction – asked 7 times
Unit 2 question pattern
- 2-mark questions: 10 asked in 2018–2025
- 7-mark questions: 5 asked in 2018–2025
- 10-mark questions: 17 asked in 2018–2025
- About 38 marks from Unit 2 in every paper
- 28 questions were asked again in a later year
Unit 2 questions year by year
- 2025: 4 Unit 2 questions asked (18 marks across that year's papers)
- 2024: 6 Unit 2 questions asked (44 marks across that year's papers)
- 2023: 6 Unit 2 questions asked (44 marks across that year's papers)
- 2022: 7 Unit 2 questions asked (62 marks across that year's papers)
- 2019: 4 Unit 2 questions asked (23 marks across that year's papers)
- 2018: 5 Unit 2 questions asked (34 marks across that year's papers)