单选题You are upgrading your Cisco router IOS from a TFTP server over the network. The upgrade procedure is stopped and you are prompted to erase the current flash contents before continuing. What is most plausible reason for this? （）A There is insufficient

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单选题

You are upgrading your Cisco router IOS from a TFTP server over the network. The upgrade procedure is stopped and you are prompted to erase the current flash contents before continuing. What is most plausible reason for this? （）

There is insufficient room for more than one image.

The router has detected a copy of the current software image on the TFTP server.

The file can be relocated and not compressed.

The image to load is a binary executable file.

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第1题：

You need to upgrade the IOS of an existing router on your network. The new IOS image is located on a TFTP server that you have set up within the network. What command should you issue in order to download the new IOS version?（）

A. Router# copy tftp flash

B. Router# copy flash run

C. Router(config)# restore flash

D. Router(config)# repair flash

E. Router#copy flash tftp

F. Router# copy start flash

参考答案：A

第2题：

Refer to the exhibit. For what two reasons has the router loaded its IOS image from the location that is shown? ()

A.Router1 has specific boot system command that instruct it to load IOS from TFTP server.

B.Router1 is acting as a TFTP server for other routers.

C.Router1 cannot locate a valid IOS image in flash memory.

D.Router1 defaulted to ROMMON mode and loaded the IOS image from a TFTP server.

E.Cisco routers will first attempt to load a image from TFTP for management purposes.

参考答案：A, C

第3题：

During startup, router VE1 displays the following error message:

boot: cannot open "flash:"

What will VE1 do next?

A. It will attempt to locate the configuration file from a TFTP server. If this fails, it will initiate the setup dialog.

B. It will attempt to locate the IOS from a TFTP server. If this fails, it will load a limited IOS from ROM.

C. It will attempt to locate the configuration file from a TFTP server. If this fails, it will load a limited configuration from ROM.

D. Because of damaged flash memory, the router will fail the POST.

E. It will attempt to locate the IOS from a TFTP server. If this fails, it will initiate the setup dialog.

F. None of the above

正确答案：B
B 解析：Explanation:
The boot sequence of a Cisco router is shown below:
Booting up the router and locating the Cisco IOS
1. POST (power on self test)
2. Bootstrap code executed
3. Check Configuration Register value (NVRAM) which can be modified using the config-register command

0 = ROM Monitor mode
1 = ROM IOS
2 - 15 = startup-config in NVRAM

4. Startup-config file: Check for boot system commands (NVRAM)
If boot system commands in startup-config
a. Run boot system commands in order they appear in startup-config to locate the IOS
b. [If boot system commands fail, use default fallback sequence to locate the IOS (Flash, TFTP, ROM)?]

If no boot system commands in startup-config use the default fallback sequence in locating the IOS:
a. Flash (sequential)
b. TFTP server (netboot)
c. ROM (partial IOS) or keep retrying TFTP depending upon router model

5. If IOS is loaded, but there is no startup-config file, the router will use the default fallback sequence for locating the IOS and then it will enter setup mode or the setup dialogue.

6. If no IOS can be loaded, the router will get the partial IOS version from ROM

第4题：

A、Router# copy tftp flash
B、Router# copy flash run
C、Router(config)# restore flash
D、Router(config)# repair flash
E、Router#copy flash tftp
F、Router# copy start flash

正确答案:A

第5题：

If XYZ LTD needs to upgrade the Cisco IOS Software of a Cisco Router, Where is the best place to download the upgrade image file from?（）

A、The best option is to download it from the Cisco TAC website
B、The best option is to download it from the Cisco.Com Software support site
C、The best option is to download it form the Cisco Advanced Services website
D、The best option is to download it from the TFTP site on Cisco.com

正确答案:B

第6题：

There are no boot system commands in a router configuration in NVRAM.What is the fallback sequence that router will use to find an ios during reload?()

A. Flash,TFTP server,ROM

B. Flash,NVRAM,ROM

C. ROM,NVRAM,TFTP server

D. NVRAM,TFTP server,ROM

E. TFTP server,Flash,NVRAM

参考答案：A

第7题：

During startup, the router displays the following error message: boot: cannot open "flash:" What will the router do next?（）

A、Because of damaged flash memory， the router will fail the POST
B、It will attempt to locate the IOS from a TFTP server. If this fails， it will initiate the setup dialog.
C、It will attempt to locate the IOS from a TFTP server. If this fails， it will load a limited IOS from ROM
D、It will attempt to locate the configuration file from a TFTP server. If this fails， it will initiate the setup dialog.
E、It will attempt to locate the configuration file from a TFTP server. If this fails， it will load a limited configuration from ROM

正确答案:C

第8题：

Which is the correct fallback sequence for loading the Cisco IOS?()

A. ROM, Flash, NVRAM

B. ROM, TFTP server, Flash

C. Flash, TFTP server, ROM

D. Flash, NVRAM, RAM

参考答案：C

第9题：

Which of the following is true about the Cisco IOS-IPS functionality？（）

A、 The signatures available are built into the IOS code.
B、 Toupdate signatures youneed to install a new IOS image
C、 To activate new signatures you download a new Signature DefiitionFile （SDF） from Cisco’s web site
D、 Loading and enabling selected IPS signatures is user configurable
E、 Cisco IOS onlyprovides Intrusion Detection functionality
F、 Cisco IOS-IPS requires a network module installed in your router running sensor software

正确答案:C,D

第10题：

During startup, the router displays the following error message: boot: cannot open "flash:" What will the router do next（）。

A、Because of damaged flash memory, the router will fail the POST.
B、It will attempt to locate the IOS from a TFTP server. If this fails, it will initiate the setup dialog.
C、It will attempt to locate the IOS from a TFTP server. If this fails, it will load a limited IOS from ROM.
D、It will attempt to locate the configuration file from a TFTP server. If this fails, it will initiate the setup dialog.
E、It will attempt to locate the configuration file from a TFTP server. If this fails, it will load a limited configuration from ROM.

正确答案:C

You are upgrading your Cisco router IOS from a TFTP server o

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