2012年思科认证（CCNA）考试练习题精选4
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16. Distributed Computing Environment (DCE. is an example of (分布式计算环境( D E C .是下面的哪一项的一个例子.？
A. OSI model
B. RPC implementation
C. Extreme Data Representation
D. A and B
17. Which statement is true of WinSock (下面对Wi n S o c k的哪一句陈述是正确的.？
A. It is a MAC application
B. It represents a graphical user interface
C. It represents a network layer
D. It provides the means for sharing an Internet connection between multiple IP protocol suite utilities
18. Which statement is true of TLI (下面关于T L I的哪一句陈述是正确的.？
A. It is a layer in the OSI model
B. It is a layer in the TCP/IP model
C. It is a System V API
D. It is part of the UNIX Kernel
19. Which statement is true of Windows Name Server (WINS. (下面对于Windows 命名服务器( W I N S .的陈述中，哪一句是正确的.？
A. It is a protocol
B. It provides capability for name resolution
C. It is a network layer
D. It is a proprietary name server
E. A, B, and D only
F. B and D only
20. Of the following, which field is not a part of the TCP header (在下面各项中，哪一个字段不是T C P报头的一部分.？
A. Subnet mask
B. Sequence number
C. Data offset
D. Destination port