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During startup, the router displays the following error message: boot: cannot open "flash:" What will the router do next?
During startup, the router displays the following error message: boot: cannot open "flash:" What will the router do next?
admin
2019-04-08
34
问题
During startup, the router displays the following error message: boot: cannot open "flash:" What will the router do next?
选项
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.
答案
C
解析
这个问的是路由器寻找IOS的过程。1.路由器在POST后,先查看寄存器的值,这个值是一组4个十六进制的数字,而其中的最后的一位影响启动的过程。2.在NVRAM的配置文件中查看boot system命令,这个命令告诉引导程序在哪里寻找IOS。在这个题中说没有boot system的命令保存在NVRAM中。所以这步跳过。3.如果在NVRAM的配置文件中没有找到boot system命令,引导程序使用flash中所找到的第一个有效的IOS镜像。4.如果flash中没有有效的IOS镜像,引导程序将生成一个TFTP本地广播以定位TFTP服务器。5.如果没有找到TFTP服务器,引导程序将加载ROM中的迷你IOS(RXBOOT 模式)6.如果ROM中有迷你IOS,那么迷你IOS在随后加载并且进入RXBOOT模式;否则路由器不是重新试图寻找IOS镜像,就是加载ROMMON并且进入ROM Monitor模式。
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