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25) 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
26) 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
27) 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
28) ICMP、I P、ARP and RARP of the IP protocol suite map to (IP协议套件的I C M P、I P、A R P和R A R P映射到)：
A. OSI layers 1 and 2 B. OSI layer 5
C. OSI layer 3 D. OSI layer 2
29) Which layer is most important in providing reliable data exchange between two systems (在两个系统之间提供可靠的数据交换中，哪一层是最重要的)？
A. Physical layer B. Data link layer
C. Session layer D. Transport layer
30) Which of the following does TCP provide (TCP提供了下面的哪一个功能)？
A. Unreliable data stream
B. Connectionless virtual circuit
C. Flow control
D. Structured byte stream movement
31) 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
32) What is the sequence number in a TCP header used for (在T C P报头中的顺序号的作用是什么)？
A. Acknowledgments
B. Reordering of the octets received
C. Rejecting duplicate octets
33) Variable sliding windows provide an explicit mechanism for notifying TCP if an intermediate node (for example, a router) becomes congested (在中间节点，例如一个路由器拥塞的情况下，可变滑动窗口提供了通知T C P的显式机制)。
A. True B. False
34) Which of the following parameters is not a part of UDP header (下面的哪一个参数不是U D P报头的一部分)？
A. Source port B. Urgent pointer
C. Checksum D. Length E. Destination port
35) When a router has been configured for UDP flooding, the source address might change,but the destination address will not change as the datagram propagates through the network (当一个路由器已经配置为U D P泛洪时，当数据报在网络上传播的过程中，源地址可能改变，但是目的地址不会改变)？
A. True B. False
36) The spanning-tree algorithm allows (生成树算法允许)：
A. Forwarding of packets with no control
B. Forwarding of broadcasts to an interface which already has received the broadcast
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