Lec-35: Carrier Sense Multiple Access/ Collision Detection | CSMA/CD | Computer Networks
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- Опубліковано 18 вер 2024
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This video explains the concept of CSMA with Collision Detection.
Collision Detection detects when a collision occurs and quickly informs the devices on the network to stop transmitting. The sender compares the signal transmitted with the signal received by the receiver. If the two signals differ, the sender assumes a collision has occurred.
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🎯 Key Takeaways for quick navigation:
00:00 📚 Introduction to CSMA/CD
- Explanation of CSMA/CD as Carrier Sense Multiple Access/Collision Detection.
- Highlighting the absence of an acknowledgement system in CSMA/CD.
01:57 📡 How Collision Detection Works
- Discussing how stations can detect collisions during data transmission.
- Emphasizing that collision detection occurs when a station is actively transmitting.
05:23 🕐 Propagation Delay and Transmission Time
- Explaining the importance of transmission time being greater than propagation delay.
- Providing a formula: Transmission time should be greater than or equal to 2 times propagation delay.
09:10 💡 Worst-Case Scenario
- Discussing a worst-case scenario where collision detection timing is critical.
- Highlighting the formula: Transmission time should be greater than or equal to 2 times propagation delay.
13:43 📈 Efficiency of CSMA/CD
- Introducing the efficiency formula for CSMA/CD: 1/(1+6.44a).
- Explaining the significance of 'a' as propagation time divided by transmission time.
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Sir if both acknowledgement and collision signal propagates with some frequency, then both will create problem. Then, what is the advantage of not using acknowledgement but collision signal?
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