1
2 20056
24365 3
4
10 5
11 20056 12 6
61.7 486 102.3 613 13 : : 14 7
15 : : 16 8
17 18 9
: 6 19 20066 20 10
(: 21 (: (: (: 22 11
(: (: 23 20066 24 12
25 idc(internet Data Center)MDC(Media Distribution Center) 26 13
27 28 14