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Computer Networks (BCS603) AKTU previous year questions 2018–2025

Every Computer Networks question from 6 AKTU papers, tagged by unit, topic and marks. A few recent questions from each unit are listed below; open the page to filter by unit, topic or mark type.

Unit 1: Introductory Concepts and Physical Layer – AKTU PYQs

  • Determine the number of links needed for a fully connected mesh topology with 10 nodes. (2 marks, 2025, Physical Layer Transmission)
  • A signal is transmitted with an initial power of 2W and experiences an attenuation of -3 dB. Calculate the received power. (2 marks, 2025, Physical Layer Transmission)
  • List the functions of all layers in OSI reference model using a well labelled diagram. (2 marks, 2025, Network Architecture and Protocols)
  • A 4 MB frame is transmitted over a 1000 KM link with 2 Mbps bandwidth. Propagation speed is 2x10^8 m/s. Compute total delay (latency) if there are 5 routers, each with 1 us processing and 2 us queuing delay. (7 marks, 2025, Physical Layer Transmission)
  • What are the applications of Computer Networks? (2 marks, 2024, Introduction to Computer Networks)

Unit 2: Link Layer and Medium Access Control – AKTU PYQs

  • 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)

Unit 3: Network Layer – AKTU PYQs

  • List various policies that are used for congestion control. (2 marks, 2025, Congestion Control)
  • A company is assigned the address block 192.168.10.0/24. Divide it into 4 subnets and specify subnet ranges. (7 marks, 2025, Logical Addressing and Subnetting)
  • Define Leaky Bucket Algorithm. How does Token Bucket Algorithm provide better traffic shaping control? (7 marks, 2025, Congestion Control)
  • Discuss how the count-to-infinity problem occurs in Distance Vector Routing. Suggest any one method to mitigate it. (7 marks, 2025, Routing and Forwarding)
  • For the following subnet, distance vector routing is used and the vectors that have just come into router C: from B: (5, 0, 8, 12, 6, 2); from D: (16, 12, 6, 0, 9, 10); and from E: (7, 6, 3, 9, 0, 4). The measured delays to B, D and E are 6, 3, and 5 respectively. Calculate C's new routing table. Give both the outgoing line to use and the expected delay. (7 marks, 2025, Routing and Forwarding)

Unit 4: Transport Layer – AKTU PYQs

  • What is Silly Window Syndrome? Explain how sender and receiver can avoid it using Nagle's and Clark's algorithms. (7 marks, 2025, TCP Protocol)
  • Explain TCP segment header. Also, illustrate the TCP connection management. (7 marks, 2025, TCP Protocol)
  • Write about Registered ports. (2 marks, 2024, TCP Protocol)
  • Differentiate between connection less and connection oriented. (2 marks, 2024, TCP Protocol)
  • Define TCP features and header in detail. (10 marks, 2024, TCP Protocol)

Unit 5: Application Layer – AKTU PYQs

  • What is the role of stub in Remote Procedure Call (RPC) mechanism? (2 marks, 2025, Remote Login and Telnet)
  • Explain public key cryptography. List its advantages and disadvantages. Explain the working of RSA algorithm with suitable example. (7 marks, 2025, Data Compression and Cryptography)
  • Describe the following: (i) SNMP (ii) DNS (iii) Data Compression (7 marks, 2025, Network Management and SNMP)
  • Explain how SMTP can handle transfer of videos and images? Also, explain the advantages of IMAP4 over POP3 mail access protocols. (7 marks, 2025, Electronic Mail and SMTP)
  • Explain the following: (i) FTP (ii) HTTP (iii) Telnet (7 marks, 2025, File Transfer Protocol)