题目内容

1. What control-plane and data-plane mechanisms areneeded to provide a QoS guarantee in the Internet?

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2. WFQ (weighted air queuing) vs. WRR (weighted roundrobin)? (Compare their complexity and scalability.)

3. Why is RED (Random Early Discard) better than FIFO(First-In First-Out), especially or real-time traf c?

4. IntServ vs. DiServ? (Compare their QoS granular-ity, complexity at edge routers, complexity at corerouters, and scalability.)

5. What are the barriers to deploying IntServ? (List atleast two barriers.)