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CCNA 3 Labs and Study Guide - BINARYBB.INFO – @jagalbraith

CCNA 3 Labs and Study Guide - BINARYBB.INFO – @jagalbraith

CCNA 3 Labs and Study Guide - BINARYBB.INFO – @jagalbraith

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CSMA/CD Process Flow Chart Exercise<br />

Draw a flow chart of the CSMA/CD process. Your flow chart should have a minimum of six steps, but can<br />

have more.<br />

Figure 4-1 CSMA/CD Process Flow Chart<br />

Calculate<br />

Back-Off Algorithm<br />

Send Out<br />

Jam Signal<br />

Simple Solution<br />

1. Host wants to transmit<br />

2. Is carrier sensed?<br />

3. Assemble frame<br />

4. Start transmitting<br />

5. Is a collision detected?<br />

6. Keep transmitting<br />

7. Is the transmission done?<br />

8. Transmission completed<br />

9. Broadcast jam signal<br />

10. Attempts = Attempts + 1<br />

11. Attempts > Too many?<br />

12. Too many collisions; abort<br />

transmission<br />

13. Algorithm calculates backoff<br />

14. Wait for t microseconds<br />

Listen to Wire<br />

(Carrier Sense)<br />

Transmit if Free <strong>and</strong><br />

Continue to Listen<br />

Collision<br />

Detected?<br />

Finish<br />

Transmission<br />

Complex Solution<br />

1<br />

2<br />

3<br />

4<br />

5<br />

6<br />

7<br />

8<br />

No<br />

No<br />

Yes<br />

Yes<br />

Yes<br />

No<br />

Chapter 4: Switching Concepts 223<br />

9<br />

10<br />

11<br />

12<br />

Yes<br />

No<br />

13<br />

14

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