Before installing a new, upgraded version of the IOS, what should be checked on the router, and which command should be used to gather this information?（）
- A、the amount of available ROM
- B、the amount of available flash and RAM memory
- C、the version of the bootstrap software present on the router
- D、show version
- E、show processes
- F、show running-config
正确答案:B,D
答案解析:有
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