单项选择题 You are conducting a cdp-based discovery using an edge switch for the seed.  there is a router between the switch and the wlse.  none of the access points are discovered， and the discovery log shows the switch is snmp unreachable. What is the problem？（）

单项选择题 Whenusingwhichapplicationmayitbenecessarytodeployaccesspointsinmonitor-onlymode？（）

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？（）