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單項選擇題Which layer of the OSI reference model is responsible for ensuring reliable end-to-end delivery of data?（）

A.Application
B.Presentation
C.Session
D.Transport
E.Network
F.Data-Link

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1.單項選擇題You download a file from an FTP site on the Internet. What is the highest layer in the OSI model used in this FTP operation?（）

A. Application
B. Presentation
C. Session
D. Transport
E. Internet
F. Data Link
G. Physical

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2.單項選擇題While troubleshooting a connectivity problem on the network, you issue the ping command from your PC command prompt, but the output shows "request times out."At which OSI layer is this problem associated with?（）

A. The data link layer
B. The application layer
C. The access layer
D. The session layer
E. The network layer

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3.單項選擇題You are logged into a router and with to view the layer 3 information about your neighboring Cisco routers. What IOS command gives layer 3 information for of the directly connected router interfaces?（）

A. show ip links
B. show cdp neighbor
C. show cdp neighbor detail
D. show ip clients
E. show ip route
F. None of the above

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4.單項選擇題In the context of configuring dial-on-demand routing using ISDN, what is the purpose of the dialer-list command?（）

A. to identify valid numbers for incoming calls
B. to define the type of ISDN switch at the central office
C. to specify the list of outgoing phone numbers used by the router
D. to associate a dial configuration with a physical interface
E. to define interesting traffic that will enable the link

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5.單項選擇題A network administrator needs to configure a router for a Frame Relay connection to a non-Cisco router. Which of the following commands will prepare the WAN interface for this connection?（）

A. Router(config-if)# encapsulation frame-relay q933a
B. Router(config-if)# encapsulation frame-relay ansi
C. Router(config-if)# encapsulation frame-relay ietf
D. Router(config-if)# encapsulation frame-relay isl
E. None of the above

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