选择题：
ABBBA
CCCAD
CBCBA
CCCCB
ACACC
ADCCD
CBBDC
DCCBB
填空题：
A
111.128.0.0
111.255.255.255
0.53.21.9
111.255.255.254
bandwidth
sdh
route ospf
0.0.127.255
128.58.0.0 255.255.128.0 202.112.8.10
192.168.0.101
255.255.255.255
ACK
0.0.0.0
192.168.0.1
http://mail.pku.pdu.cn
59.67.148.5
1327742114
443
202.113.78.111
简答题：
(1)59.67.6.128/30
59.67.6.132/30
59.67.6.64/30
59.67.6.72/30
59.67.6.0/30
59.67.32.0/22
59.67.128.0/22
(2)RB E1
(3)255.255.255.192 59.67.33.129～59.67.33.190
255.255.255.192 59.67.33.193～59.67.33.222
255.255.255.192 59.67.33.225～59.67.33.254
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