单项选择题

提供给Internet用户访问的Web服务器一般放置在 (43) 。

A．内部办公区
B．Internet
C．内部数据库区
D．DMZ区
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单项选择题
To reduce their design complexity, most networks are organized as a stack of (72) , each one built upon the one below it.
A．blocks
B．modules
C．pieces
D．layers
单项选择题
The essence of (74) is the invention of a hierarchical, domain-based naming scheme. It is primarily used for mapping host names and e-mail destinations to IP addresses.
A．DNS
B．NNTP
C．CDP
D．FTP
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