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

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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.)

6. What are the barriers to deploying DiServ? (List atleast two barriers.)

下面程序段的输出结果是（）。#include int main( ){ int k,a[3][3]={1,2,3,4,5,6,7,8,9};for (k=0;k<3;k++)printf("%d",a[k][2-k]);return 0;}

A. 3 5 7
B. 3 6 9
C. 1 5 9
D. 1 4 7