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What will a router do during startup if a configuration file

题目
单选题
What will a router do during startup if a configuration file is not located in NVRAM?（）
A

it will search for the configuration file in the locations specified by boot system commands.

B

it will search for the configuration file in flash and if no configuration file is found there, it will enter the setup dialog.

C

it will search for the configuration file on a TFTP server and if no configuration file is found there, it will enter the setup dialog.

D

it will search for the configuration file in flash and if no configuration file is found there, it will load a limited configuration file from ROM.

E

it will search for the configuration file on a TFTP server and if no configuration file is found there, it will load a limited configuration file from ROM.

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相似问题和答案

第1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2题：

Refer to the exhibit. What can be determined about the router from the console output?()

A.No configuration file was found in NVRAM.

B.No configuration file was found in flash.

C.No configuration file was found in the PCMCIA card.

D.Configuration file is normal and will load in 15 seconds.


参考答案：B

第3题：

After working all night and successfully configuring a Cisco router for the Ezonexam network you save your changes on the startup config, reboot the router, and go out for a cigarette. When you return, none of your changes are active and the router boots to the initial configuration mode! Which of the choices below indicates the source of your problem?

A．Hardware failure in NVRAM prevents the router from loading the config

B．Startup-config in flash is corrupt and cannot be analyzed

C．Router configuration-register set to bypass startup configuration

D．Startup-config in NVRAM is corrupt and cannot be analyzed

E．None of the above


正确答案：C
解析：Explanation:
The default configuration-register setting of 0x2102 loads the IOS from flash and the configuration from NVRAM.
However, for password recovery, you can set the register to 0x2142 and the startup-config file in NVRAM will be bypassed. The problem described here is that the config register was not changed back to 0x2102 before the router was rebooted, so the active configuration is bypassed. Simply setting the config register back to 0x2102 will fix this problem.

Incorrect Answers:
A, B, D. All of these describe hardware or software errors. In the event that this is the problem, errors will be generated and the router will fail to boot properly. In these cases, the router will not return to the initial startup configuration.

第4题：

A Cisco router is booting and has just completed the POST process. It is now ready to find and load an IOS  image. What function does the router perform next?（）

  • A、It checks the configuration register.
  • B、It attempts to boot from a TFTP server.
  • C、It loads the first image file in flash memory.
  • D、It inspects the configuration file in NVRAM for boot instructions.

正确答案:A

第5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6题：

Given the following router output,which configuration file will the router use at its next reload?()

A.config

B.clientqos.cnf

C.startup-config

D.running-configuration


参考答案：D

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：

What will a new Ezonexam router do during startup if a configuration file is not located in NVRAM?

A．It will search for the configuration file in the locations specified by boot system commands.

B．It will search for the configuration file in flash and if no configuration file is found there, it will enter the setup dialog.

C．It will search for the configuration file on a TFTP server and if no configuration file is found there, it will enter the setup dialog.

D．It will search for the configuration file in flash and if no configuration file is found there, it will load a limited configuration file from ROM.

E．It will search for the configuration file on a TFTP server and if no configuration file is found there, it will load a limited configuration file from ROM.


正确答案：C
解析：Explanation:WhenarouterbootsandisabletolocatetheIOSitbeginstoloadtheconfigurationfile.Theconfigurationfile,savedinNVRAM,isloadedintomainmemoryandexecutedonelineatatime.Theseconfigurationcommandsstartroutingprocesses,supplyaddressesforinterfaces,andsetmediacharacteristics.IfnoconfigurationfileexistsinNVRAM,therouterattemptsanetworkbootandsendsabroadcastrequestforthefileonaTFTPserver.Ifthisisalsonotfound,theoperatingsystemexecutesaquestion-driveninitialconfigurationroutinecalledthesystemconfigurationdialog.

第9题：

What is the purpose of pressing the Ctrl+Break keys during the router password recover procedure?（）

  • A、To restart the router.
  • B、To bypass the configuration in Flash.
  • C、To view the password before changes are made.
  • D、To bypass setup configuration mode.
  • E、To access ROM Monitor mode.

正确答案:E

第10题：

What will a router do during startup if a configuration file is not located in NVRAM?（）

  • A、it will search for the configuration file in the locations specified by boot system commands.
  • B、it will search for the configuration file in flash and if no configuration file is found there, it will enter the setup dialog.
  • C、it will search for the configuration file on a TFTP server and if no configuration file is found there, it will enter the setup dialog.
  • D、it will search for the configuration file in flash and if no configuration file is found there, it will load a limited configuration file from ROM.
  • E、it will search for the configuration file on a TFTP server and if no configuration file is found there, it will load a limited configuration file from ROM.

正确答案:C

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