单项选择题
A Cisco router is booting and has just completed the POST process. It is now ready to find and load an IOS image. What function does the router perform next?（）
A.It checks the configuration register. B.It attempts to boot from a TFTP server. C.It loads the first image file in flash memory. D.It inspects the configuration file in NVRAM for boot instructions.
多项选择题 Whatfunctionsdoroutersperforminanetwork?(Choosetwo.)（）
单项选择题 AtwhichOSIlayerisalogicalpathcreatedbetweentwohostsystems?（）
多项选择题 Whatthreepiecesofinformationcanbeusedinanextendedaccesslisttofiltertraffic?(Choosethree.)（）
