思科认证考试（Cisco）CCNA考试七十九题(5)

 

 

 

41 Which of the following commands would not set a password on a Cisco router?

A. router(config)#enable secret
B. router(config-line)#password test
C. router(config)#service encryption password
D. router(config)#enable password

Answer C. This command is used to encrypt passwords in configuration files.

42. Which of the following would cause a router to boot into the initial
configuration dialog after powering has cycled?

A. Someone had copied the startup configuration file in a TFTP server
B. The running configuration file was copied to the startup configuration file
C. It is the first time router has ever been turned on
D. The write erase command was executed immediately before powering down the router.

Answer C and D. These two scenarios describe what will happen when the router needs
to use NVRAM to boot if it cannot find the configuration file.

43. What would cause a router to boot from ROM?

A. 0x3202 B. 0x2302 C. 0x2101 D. 0x2103
Answer C. A configuration register of 1 or 0 will cause the router to boot from ROM.

44. Where does the running config file exist?

A. NVRAM B. ROM C. RAM D. Flash

Answer C. This file is erased if the router is reloaded or rebooted.

45. How do you back up a router?

A. router#copy running-config startup-configuration
B. router(config)#copy TFTP flash
C. router#copy flash TFTP D. router#copy flash NVRAM

Answer C. You can copy the file to a TFTP server or other storage device.

46. Which of the following is not valid?

A. router>show version B. router#show running-config
C. router#show startup-config D. router#show RAM

Answer D.

47. Which of the following are basic router functions?

A. Packet switching B. Packet filtering
C. Path determination D. Rapid convergence

Answer A and C. Packets get switched once they are determined by the router where
to go.

48. Which of the following is not an interior routing protocol?

A. RIP B. IGRP C. OSPF D. BGP

Answer D. BGP is an exterior routing protocol designed to communicate between
autonomous systems.

49. Which of the following routing protocols communicate router information by
sending the state of it s links to all routers in it s domain?

A. BGP B. RIP C. IGRP D. OSPF
Answer D. This is a "link state" routing protocol. RIP and IGRP are distance
vector, and BGP communicates reachability between domains.

50. What is a problem caused by distance vector routing protocols?

A. Split horizon B. Route Poison
C. Counting to infinity D. Max hop count E. Hold down timers

Answer C. Answers ABDE are counter measures to the counting to infinity problem
caused by distance vector protocols.