AKTU Computer Networks · Important Questions 2026Source: ryzenstudy.com PYQs
BCS603 Computer Networks Important Questions 2026 (AKTU)
Repeat analysis + most-asked questions, unit-wise
What we did: built from all 4 AKTU Computer Networks papers (2021-22–2024-25): 95 questions grouped into 69 distinct questions, 17 of which were asked in more than one paper.
- of marks were repeat questions
- 47%
- of marks were repeat questions
- questions asked in 2+ papers
- 17
- questions asked in 2+ papers
- papers analysed (2021-22–2024-25)
- 4
- papers analysed (2021-22–2024-25)
- units, mapped to current syllabus
- 5
- units, mapped to current syllabus
How much of the paper repeats?
- Repeats are real: when we checked each newer BCS603 paper against the papers before it, on average 47% of its marks were questions already asked in an earlier paper.
- 2023-24 paper: 37% of marks were repeats (7 of 7 repeated questions were in our top list).
- 2024-25 paper: 56% of marks were repeats (6 of 11 repeated questions were in our top list).
- Topic weightage is a guide, not a guarantee: our Tier 1 + Tier 2 topics covered 59% of the next paper's marks — picking the same number of topics at random would have covered about 48%.
Across 10 subjects and 23 papers we tested, 43% of marks repeated earlier questions on average.
1.Unit-wise most-asked questions
Ranked by how many papers asked them, then by how recently. Click a paper to open it.
Unit 1: Introductory Concepts · Physical Layer
22% of past marks| Question | Asked |
|---|---|
| List the functions of all layers in the OSI reference model using a well-labelled diagram. | Asked 3× |
| Define the various topologies with diagram, features, and pros and cons. | Asked 3× |
| Name and explain the network devices at each layer of the OSI model. | Asked 2× |
| A 4 MB frame is transmitted over a 1000 km link with 2 Mbps bandwidth. Propagation speed is 2x10^8 m/s. Compute the total delay (latency) if there are 5 routers, each with 1 microsecond processing and 2 microsecond queuing delay. 7 marks2024-25 Q3(b) | Asked 1× |
Unit 2: Link layer
26% of past marks| Question | Asked |
|---|---|
| A bit stream x^8 + x^6 + x^3 + x^2 + x + 1 is transmitted using the CRC method. The generator polynomial is x^4 + x^2 + x + 1. Show the actual codeword transmitted. Suppose the third bit from the left is inverted during transmission; show that this error is detected at the receiver end. | Asked 4× |
| Illustrate the concept of "piggybacking". | Asked 2× |
| Explain noisy channel protocols with explanation and diagram. | Asked 2× |
| Illustrate the concept of slotted ALOHA with a suitable diagram. Measurement of a slotted ALOHA channel with an infinite number of users shows that 10% of slots are idle. Calculate (i) the channel load and (ii) the throughput. 7 marks2024-25 Q3(a) | Asked 1× |
Unit 3: Network Layer
20% of past marks| Question | Asked |
|---|---|
| A company is assigned the address block 192.168.10.0/24. Divide it into 4 subnets and specify the subnet ranges. | Asked 3× |
| Explain the new features in IPv6 over IPv4. What is the purpose of multiple headers? Explain in brief how IPv6 handles multiple headers. | Asked 2× |
| List the various policies that are used for congestion control. | Asked 2× |
| Discuss how the count-to-infinity problem occurs in Distance Vector Routing. Suggest any one method to mitigate it. (A second distance vector calculation for router C follows in the original; see original paper.) | Asked 2× |
Unit 4: Transport Layer
14% of past marks| Question | Asked |
|---|---|
| Explain the TCP segment header. Also, illustrate the TCP connection management. | Asked 2× |
| Define the Leaky Bucket algorithm. How does the Token Bucket algorithm provide better traffic shaping control? | Asked 2× |
| Write about Quality-of-Service parameters. | Asked 2× |
| Differentiate TCP and UDP in the context of the header format. | Asked 2× |
Unit 5: Application Layer
18% of past marks| Question | Asked |
|---|---|
| Explain public key cryptography. List its advantages and disadvantages. Explain the working of the RSA algorithm with a suitable example. | Asked 3× |
| Describe the following: (i) SNMP (ii) DNS (iii) Data Compression | Asked 3× |
| Explain the following terms: (i) FTP (ii) SMTP (iii) DNS (iv) ARP | Asked 2× |
| Explain the following: (i) FTP (ii) HTTP (iii) Telnet 7 marks2024-25 Q7(b) | Asked 1× |
2.Topic weightage: which topics carry the marks
Blue = Tier 1 + Tier 2 (topics that carried ~80% of past marks). Grey = the rest. It shows where marks have gone, not a promise of what comes next.
Error detection & CRC · U2
6.8% (cum 7%)
Channel allocation & random access · U2
6.2% (cum 13%)
UDP & TCP · U4
5.9% (cum 19%)
Sliding window protocols · U2
5.7% (cum 25%)
FTP & remote login · U5
5.7% (cum 30%)
Topologies & connections · U1
5.1% (cum 35%)
Flow control & Stop-and-Wait · U2
4.6% (cum 40%)
Cryptography · U5
4.5% (cum 45%)
Network management (SNMP) · U5
4.5% (cum 49%)
IPv4 & IPv6 · U3
4.2% (cum 53%)
Subnetting & CIDR · U3
4.1% (cum 57%)
Quality of service · U4
3.9% (cum 61%)
ARP, RARP, DHCP, ICMP · U3
3.3% (cum 65%)
OSI reference model · U1
3.3% (cum 68%)
Routing algorithms · U3
3.1% (cum 71%)
Network devices · U1
2.9% (cum 74%)
Impairments & performance · U1
2.8% (cum 77%)
Signal encoding · U1
2.5% (cum 79%)
Congestion control · U3
2.4% (cum 82%)
TCP/IP protocol suite · U1
2.1% (cum 84%)
Connection management · U4
1.9% (cum 86%)
Switching & multiplexing · U1
1.8% (cum 87%)
IP addressing & classes · U3
1.3% (cum 89%)
Flow control & window management · U4
1.3% (cum 90%)
Electronic mail · U5
1.3% (cum 91%)
LAN standards · U2
1.3% (cum 92%)
Interdomain & intradomain protocols · U3
1.3% (cum 94%)
WWW & HTTP · U5
1.2% (cum 95%)
Ports & multiplexing · U4
1.2% (cum 96%)
Transmission media · U1
0.7% (cum 97%)
Error correction & Hamming · U2
0.5% (cum 97%)
Applications & network types · U1
0.5% (cum 98%)
Framing · U2
0.5% (cum 98%)
Bridges & switches · U2
0.5% (cum 99%)
Routing, forwarding & delivery · U3
0.5% (cum 99%)
Data compression · U5
0.5% (cum 100%)
| Topic | Papers | Share |
|---|---|---|
| Error detection & CRC · Unit 2 · Tier 1 | 4/4 | 6.8% |
| Channel allocation & random access · Unit 2 · Tier 1 | 4/4 | 6.2% |
| UDP & TCP · Unit 4 · Tier 1 | 4/4 | 5.9% |
| Sliding window protocols · Unit 2 · Tier 1 | 3/4 | 5.7% |
| FTP & remote login · Unit 5 · Tier 1 | 4/4 | 5.7% |
| Topologies & connections · Unit 1 · Tier 1 | 4/4 | 5.1% |
| Flow control & Stop-and-Wait · Unit 2 · Tier 1 | 3/4 | 4.6% |
| Cryptography · Unit 5 · Tier 1 | 3/4 | 4.5% |
| Network management (SNMP) · Unit 5 · Tier 1 | 3/4 | 4.5% |
| IPv4 & IPv6 · Unit 3 · Tier 1 | 3/4 | 4.2% |
| Subnetting & CIDR · Unit 3 · Tier 2 | 3/4 | 4.1% |
| Quality of service · Unit 4 · Tier 2 | 3/4 | 3.9% |
| ARP, RARP, DHCP, ICMP · Unit 3 · Tier 2 | 3/4 | 3.3% |
| OSI reference model · Unit 1 · Tier 2 | 3/4 | 3.3% |
| Routing algorithms · Unit 3 · Tier 2 | 3/4 | 3.1% |
| Network devices · Unit 1 · Tier 2 | 2/4 | 2.9% |
| Impairments & performance · Unit 1 · Tier 2 | 2/4 | 2.8% |
| Signal encoding · Unit 1 · Tier 2 | 2/4 | 2.5% |
| Congestion control · Unit 3 · Tier 2 | 2/4 | 2.4% |
| TCP/IP protocol suite · Unit 1 · Tier 3 | 2/4 | 2.1% |
| Connection management · Unit 4 · Tier 3 | 2/4 | 1.9% |
| Switching & multiplexing · Unit 1 · Tier 3 | 1/4 | 1.8% |
| IP addressing & classes · Unit 3 · Tier 3 | 1/4 | 1.3% |
| Flow control & window management · Unit 4 · Tier 3 | 1/4 | 1.3% |
| Electronic mail · Unit 5 · Tier 3 | 1/4 | 1.3% |
| LAN standards · Unit 2 · Tier 3 | 1/4 | 1.3% |
| Interdomain & intradomain protocols · Unit 3 · Tier 3 | 1/4 | 1.3% |
| WWW & HTTP · Unit 5 · Tier 3 | 2/4 | 1.2% |
| Ports & multiplexing · Unit 4 · Tier 3 | 2/4 | 1.2% |
| Transmission media · Unit 1 · Tier 3 | 1/4 | 0.7% |
| Error correction & Hamming · Unit 2 · Tier 3 | 1/4 | 0.5% |
| Applications & network types · Unit 1 · Tier 3 | 1/4 | 0.5% |
| Framing · Unit 2 · Tier 3 | 1/4 | 0.5% |
| Bridges & switches · Unit 2 · Tier 3 | 1/4 | 0.5% |
| Routing, forwarding & delivery · Unit 3 · Tier 3 | 1/4 | 0.5% |
| Data compression · Unit 5 · Tier 3 | 1/4 | 0.5% |
3.Paper pattern (2024-25)
| Section | Questions | Rule |
|---|---|---|
| A | 7 × 2 marks | Attempt all |
| B | 5 × 7 marks | Attempt any 3 |
| C | 9 × 7 marks | Attempt any 1 |
4.In the syllabus, never asked yet
Low priority, but read them once — a new paper can always start here.
- TCP congestion control · U4
- Domain Name System · U5
5.Study order
- 1Error detection & CRC (Unit 2, Tier 1)
- 2Channel allocation & random access (Unit 2, Tier 1)
- 3UDP & TCP (Unit 4, Tier 1)
- 4Sliding window protocols (Unit 2, Tier 1)
- 5FTP & remote login (Unit 5, Tier 1)
- 6Topologies & connections (Unit 1, Tier 1)
- 7Flow control & Stop-and-Wait (Unit 2, Tier 1)
- 8Cryptography (Unit 5, Tier 1)
- 9Network management (SNMP) (Unit 5, Tier 1)
- 10IPv4 & IPv6 (Unit 3, Tier 1)
- 11Subnetting & CIDR (Unit 3, Tier 2)
- 12Quality of service (Unit 4, Tier 2)
- 13ARP, RARP, DHCP, ICMP (Unit 3, Tier 2)
- 14OSI reference model (Unit 1, Tier 2)
- 15Routing algorithms (Unit 3, Tier 2)
- 16Network devices (Unit 1, Tier 2)
- 17Impairments & performance (Unit 1, Tier 2)
- 18Signal encoding (Unit 1, Tier 2)
- 19Congestion control (Unit 3, Tier 2)
FAQ
Which units of BCS603 carry the most marks?
Unit 2 (Link layer, 26% of past marks) and Unit 1 (Introductory Concepts · Physical Layer, 22% of past marks).
Do AKTU Computer Networks questions repeat?
Yes. On average 47% of the marks in each newer BCS603 paper came from questions already asked in an earlier paper, and 17 questions have appeared in more than one paper.
How is this list made?
Every question from the 4 papers (2021-22–2024-25) was mapped to the current AKTU syllabus and grouped with the same question from other years. Questions are ranked by how many papers they appeared in, then by how recently.
Study this subject
Note: this is based on past AKTU papers, not a guarantee. Questions are mapped to the current syllabus; topics that are no longer in the syllabus are left out.