CS602 Computer Networks Unit 3 notes and PYQ analysis for RGPV CSE 6th Semester. This unit covers MAC Sublayer, ALOHA, Slotted ALOHA, CSMA, CSMA/CD, CSMA/CA, Binary Exponential Backoff and IEEE 802 standards.
Unit 3 focuses on the Medium Access Control layer. It explains how multiple devices share a common communication channel and how collision detection, collision avoidance and channel access protocols work.
Understand how MAC layer controls access to shared transmission medium.
Learn Pure ALOHA, Slotted ALOHA, throughput and efficiency concepts.
Study CSMA, CSMA/CD, CSMA/CA and Binary Exponential Backoff.
Complete syllabus-based topics of CS602 Computer Networks Unit 3.
Functions, responsibilities and importance of Medium Access Control sublayer.
Random access protocol, vulnerable time, throughput and limitations.
Improved ALOHA protocol using time slots to reduce collisions.
Carrier Sense Multiple Access and its persistent and non-persistent methods.
Collision detection in wired networks and collision avoidance in wireless networks.
IEEE 802 LAN standards, Ethernet, wireless LAN and MAC layer standards.
These questions are useful for 7 marks and 14 marks answers in RGPV exams.
RGPV B.Tech VI Semester Computer Networks previous year question analysis for Unit 3.
| Year | Question | Topic | Importance |
|---|---|---|---|
| June 2025 | Discuss different strategies used to avoid collisions in CSMA/CA. | CSMA/CA | ★★★★★ |
| June 2025 | What is Pure ALOHA and Slotted ALOHA? How is efficiency of Slotted ALOHA twice that of Pure ALOHA? | ALOHA / Slotted ALOHA | ★★★★★ |
| June 2025 | Explain CSMA/CD protocol in detail. | CSMA/CD | ★★★★★ |
| Dec 2024 | Explain Binary Exponential Back-off with suitable example. | Binary Exponential Backoff | ★★★★★ |
| Dec 2024 | Explain collision free protocol. | Collision Free Protocol | ★★★★ |
| May 2024 | Explain Pure and Slotted ALOHA and CSMA. | ALOHA / CSMA | ★★★★★ |
| May 2024 | Write short note on CSMA/CA. | CSMA/CA | ★★★★ |
| May 2023 | Explain the working principle of Slotted ALOHA with suitable sketch. | Slotted ALOHA | ★★★★★ |
| May 2023 | What is Limited Contention Protocol? Explain Adaptive Tree Walk Protocol. | Limited Contention Protocol | ★★★★ |
| May 2022 | A radio station is using 14.4 Kbps channel for message transmission using slotted ALOHA. Calculate maximum throughput. | Slotted ALOHA Numerical | ★★★★ |
| Dec 2020 | How is throughput improved in Slotted ALOHA over Pure ALOHA? | ALOHA Throughput | ★★★★★ |
| Dec 2020 | How performance is improved in CSMA/CD protocol compared to CSMA protocol? | CSMA/CD | ★★★★★ |
| Topic | Asked Times | Years | Priority |
|---|---|---|---|
| ALOHA / Slotted ALOHA | 5 Times | 2020, 2022, 2023, 2024, 2025 | ★★★★★ Extremely Important |
| CSMA/CD | 3 Times | 2020, 2025 | ★★★★★ Extremely Important |
| CSMA/CA | 2 Times | 2024, 2025 | ★★★★★ Extremely Important |
| CSMA | 2 Times | 2024, 2025 | ★★★★ Very Important |
| Binary Exponential Backoff | 1 Time | 2024 | ★★★★ Very Important |
| Collision Free Protocol | 1 Time | 2024 | ★★★ Important |
| IEEE 802 Standards | Short Note | 2023 | ★★★ Important |
| MAC Sublayer | Short Note | 2020 | ★★★ Important |
| Topic | Chance of Appearing |
|---|---|
| ALOHA / Slotted ALOHA | 95% |
| CSMA/CD | 90% |
| CSMA/CA | 90% |
| CSMA Protocols | 85% |
| Binary Exponential Backoff | 80% |
| Collision Free Protocol | 70% |
| MAC Sublayer | 65% |
| IEEE 802 Standards | 60% |
Agar time bahut kam hai, to ALOHA, Slotted ALOHA, CSMA/CD aur CSMA/CA strong kar lo. In topics se Unit 3 ka question attempt karne ka chance sabse zyada hai.
ALOHA efficiency derivation, CSMA/CD working diagram, CSMA/CA collision avoidance, Binary Exponential Backoff example aur IEEE 802 short notes sab prepare karo.
a) Explain Pure ALOHA and Slotted ALOHA. Derive the efficiency of Slotted ALOHA.
b) Explain CSMA/CD protocol with suitable diagram.
a) Explain CSMA/CA protocol and collision avoidance strategies.
b) Explain Binary Exponential Backoff algorithm with suitable example.
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It covers MAC Sublayer, ALOHA, CSMA, CSMA/CD, CSMA/CA and IEEE 802 standards.
ALOHA, Slotted ALOHA, CSMA/CD and CSMA/CA are the most important topics.
Yes, Slotted ALOHA throughput and efficiency based numerical questions can appear in exams.