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Which is the correct fallback sequence for loading the Cisco IOS?（）A、ROM, Flash, NVRAMB、ROM, TFTP server, FlashC、Flash, TFTP server, ROMD、Flash, NVRAM, RAM

题目

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
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相似问题和答案

第1题：

下面哪个命令将新的思科IOS版本复制到路由器?()

A.copy flash ftp

B.copy nvram flash

C.copy flash tftp

D.copy tftp flash


答案：D

第2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.


参考答案：C

第3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4题：

TherearenobootsystemcommandsinarouterconfigurationinNVRAM.WhatisthefallbacksequencethattherouterwillusetofindanIOSduringreload?()

A.TFTPserver,Flash,NVRAM

B.ROM,NVRAM,TFTPserver

C.NVRAM,TFTPserver,ROM

D.Flash,TFTPserver,ROM

E.Flash,NVRAM,ROM


参考答案：D

第5题：

When upgrading the IOS image, the network administrator receives the exhibited error message. What could be the cause of this error?()

A. The new IOS image is too large for the router flash memory.

B. The TFTP server is unreachable from the router.

C. The new IOS image is not correct for this router platform.

D. The IOS image on the TFTP server is corrupt.

E. There is not enough disk space on the TFTP server for the IOS image.


参考答案：B

第6题：

During the boot sequence, a Ezonexam 2800 series router needs to locate and load an operating system. What is the default order the router uses to find an operating system?

A．ROM, TFTP server, Flash

B．Flash, TFTP server, ROM

C．Flash, NVRAM, TFTP server

D．Flash, ROM, TFTP server

E．Flash, TFTP server, RAM


正确答案：B
解析：Explanation:BootinguptheRouter:CiscorouterscanbootCiscoIOSsoftwarefromtheselocations:1.Flashmemory2.TFTPserver3.ROM(notfullCiscoIOS)Multiplesourceoptionsprovideflexibilityandfallbackalternatives.

第7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8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9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10题：

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

A.Flash,TFTPserver,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

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