题目内容

IP地址 172.16.20.5/20 的网络号(网络地址)为

A. 172.16.16.0
B. 172.16.20.0
C. 172.16.0.0
D. 172.16.20.4

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IP地址是202.114.18.10，掩码是255.255.255.252，其(直接)广播地址是多少?

A. 202.114.18.255
B. 202.114.18.12
C. 202.114.18.11
D. 202.114.18.8

IP地址是202.114.18.190，掩码是255.255.255.192，其子网号是____

A. 202.114.18.128
B. 202.114.18.64
C. 202.114.18.32
D. 202.114.18.0

子网掩码为255.255.255.192，主机地址为210.29.227.14，则在该子网掩码下最多可以容纳多少个主机？

A. 254
B. 126
C. 62
D. 30

30. The Internet allows rural school children______about what is happening in the world.

A) to learn
B) learning
C) learn
D) learned