情人节题库130题求助

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题目如下：


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

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

答案为AE。

但我看了半天也是AC？默认的启动顺序为
1.POST
2.BOOTSTRAP
3.Configuration Register
4. Boot command from NVRAM
如果有boot command指定，就按这个指定的image起，如果没有指定或者指定的不好使，那就按照

1. Flash
2. TFTP
3. ROM

的顺序起。所以答案是AC。

请大虾帮忙解释一下。

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