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, FlashB．Flash, TFTP server, ROMC．Flash, NVRAM, TFTP serverD．Flas

题目

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

参考答案和解析

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

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第1题：

Why might the Ezonexam network administrator set the configuration register to 0x2142 on a 2600 series Cisco router?

A．To boot the IOS from ROM

B．To reset the console password

C．To upload a new version of the configuration file

D．To upload a new version of the IOS

E．To allow a new memory upgrade to be recognized by the router

正确答案：B
解析：Explanation:
About 99 percent of the time someone uses a config-register, it's more than likely because of a lost router password. The two config-registers for recovering passwords are 0x2102 and 0x2142.

The first config-register, 0x2102, is the normal config-register if you boot the router from internal Flash. You can see this config-register by using the show version command.

In this output, you'll notice the last line says, "Configuration register is 0x2102." This is normal.

But let's say you forgot the router's password. To recover this password (as long as it's unencrypted), boot the router and bypass the startup-config using config-register 0x2142; you should then be able to see the password in the startup-config. You can use the same method for encrypted passwords, but you'll need to overwrite the original password with a new one. To change the configuration register, enter the following:
Router(config)# config-register 0x2142

This will instruct the router to bypass the configuration and boot up as if it were a brand new router using factory default settings.

第2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：

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5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

第6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7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8题：

After making some network changes you power off and then power on your Cisco router named VE1. What sequence of events occurs when VE1 is powered up?

A. Perform. POST, locate configuration statements, apply configuration statements, locate Cisco IOS software, and load Cisco IOS software.

B. Locate Cisco IOS software, load Cisco IOS software, locate configuration statements, apply configuration statements, and perform. POST.

C. Test software routines, POST, load configuration files, load Cisco IOS software, test Cisco IOS software.

D. Perrform. POST, locate Cisco IOS software, load the Cisco IOS software, locate configuration statements, and apply configuration statements.

E. Load and test IOS, load configuration files, test software routines, POST.

F. None of the above

正确答案：D
D 解析：Explanation:
Upon initial start up, Cisco routers perform. the following steps in order:
1. The router performs a power-on self-test (POST) to discover and verify the hardware.
2. The router loads and runs bootstrap code from ROM.
3. The router finds the IOS or other software and loads it.
4. The router finds the configuration file and loads it into running config.

第9题：

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

A.Flash，TFTPserver，ROM

B.Flash，NVRAM，ROM

C.ROM，NVRAM，TFTPserver

D.NVRAM，TFTPserver，ROM

E.TFTPserver，Flash，NVRAM

参考答案：A

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

During the boot sequence, a Ezonexam 2800 series router needs to locate and load an operat

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