2012年思科认证（CCNA）考试练习题精选8
2012年思科认证考试备考的朋友，不用为了查找复习资料而烦恼，小编特为广大考生朋友们搜集了有关2012年思科认证（CCNA）考试练习题，帮助大家复习，祝大家考试顺利。
36. 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
37. 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
38. 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
C. It is the network layer protocol that moves data from one node to another
D. It is the physical layer protocol for Internet connections
39. What is ICMP (什么是I C M P .？
A. It is a network layer protocol that handles control messages
B. It is a network layer protocol that resolves addresses
C. It is a session layer API that makes remote procedures transparent to a user
D. It is a transport layer function for unreliable transport
40. Ping sends an ICMP echo command to an IP address in order to determine whether anetwork connection exists to that node (Ping向一个I P地址发送了一个I C M P回送命令，目的是确定是否存在到那个节点的网络连接.？
A. True
B. False