单项选择题 The IOS of a North American Cisco Aironet 1230 Series access point has become corrupt， necessitating the need for a TFTP firmware reload. Before you press and hold the MODE button，what must the file be named in order for the reload to occur？（）

单项选择题 During the installation of the Cisco WCS， an error occurs. Where will the installation log be found？（）

单项选择题 A lightweight access point has been connected to a Catalyst 3550 24-PWR switch， and on power-up the access point fails. What is the problem with the switch？（）