12) Which protocols can NetBIOS bind to? (Select all that are applicable.) (NETBIOS可以绑定在哪个协议上，选择所有可能的协议)？
A. Appletalk
B. IPX
C. IP
D. NetBEUI
13) What layers do not exist in the TCP/IP model that are in the OSI model (哪层不在T C P / I P模型中，但它在O S I模型中)？
A. Application, presentation, and network
B. Presentation, session, and data link
C. Session, network, and physical
D. Presentation, data link, and physical
14) What is a socket in the transport layer (传输层中的套接字是什么)？
A. The socket is an IP address plus a port
B. An API that makes the transport layer independent
C. An API that allows multiple applications to share a network connection
D. A function that makes remote procedures appear to be local
15) What is a port (什么是端口)？
A. An API that makes the transport layer independent
B. An API that allows multiple applications to share a network connection
C. A function that makes remote procedures appear to be local
D. The point where upper-layer processes access transport layer services
16) Which of the following services uses a process called windowing (下面的哪一个服务使用了所谓的窗口机制)？
A. Reliable data transfer
B. Connection-oriented virtual circuit
C. Buffered transfer
D. Resequencing
E. Multiplexing
F. Efficient, full-duplex transmission
G. Flow control
17) What is UDP (什么是U D P )？
A. An API that makes the transport layer independent
B. A connectionless, unreliable transport protocol
C. An API that allows multiple applications to share a network connection
D. A function that makes remote procedures appear to be local
18) What is IP (什么是I P )？
A. It is the transport mechanism for upper layer services
B. It is the session layer API for making the transport layer independent
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