48. 教育网问题分析-QZone为例
广东较周边
省份差
学校 访问次数 平均延时
广州大学 2033 9075.8047
华南理工大学 1553 8758.7646
华南师范大学 1508 14237.0137
中山大学 1219 8939.3193
PING 222.201.68.10 (222.201.68.10) 56(84) bytes of data.
64 bytes from 222.201.68.10: icmp_seq=1 ttl=119 time=227 ms
64 bytes from 222.201.68.10: icmp_seq=2 ttl=119 time=213 ms
64 bytes from 222.201.68.10: icmp_seq=3 ttl=119 time=211 ms
64 bytes from 222.201.68.10: icmp_seq=4 ttl=119 time=221 ms
64 bytes from 222.201.68.10: icmp_seq=5 ttl=119 time=238 ms
64 bytes from 222.201.68.10: icmp_seq=6 ttl=119 time=244 ms
traceroute to 222.201.68.10 (222.201.68.10), 30 hops max, 40 byte packets
1 222.202.96.130 (222.202.96.130) 0.688 ms 0.357 ms 0.453 ms
2 210.39.19.5 (210.39.19.5) 0.240 ms 0.219 ms 0.187 ms
3 202.112.53.129 (202.112.53.129) 4.227 ms 4.117 ms 4.134 ms
4 * * *
5 202.112.19.102 (202.112.19.102) 3.298 ms 3.669 ms 3.664 ms
6 222.200.253.5 (222.200.253.5) 3.865 ms 3.856 ms 3.865 ms
7 222.200.252.14 (222.200.252.14) 10.405 ms 10.408 ms 10.535 ms
8 222.200.129.22 (222.200.129.22) 236.715 ms 236.832 ms
50. 内容被cache后
0 0.5 1 1.5 2 2.5 3
image
image
html
Expires header
1
user requests
www.yahoo.com
2
user requests
other web pages
3
user re-requests
www.yahoo.com
with a full cache
64. GSLB工作原理
Root DNS Server
LocalDns Server
上海电信用户
QQ DNS Server
1
2 3
4
5
6
7
8
9
SLB
Server
&Cache
网通IDC1
SLB
Server
&Cache
深圳电信IDC2
SLB
Server
&Cache
上海电信IDC3
GSLB控制器
IP地址库