单项选择题 Youaretroubleshootingaproblemwithacisco7920wirelessipphoneonastandalonewlan.thephoneringsbut，whenyouAnswer，thecallisdropped. Whatmayhavecausedthisproblem？（）

单项选择题 A cisco wcs version 4.0 has been installed on a server with a dual pentium 3.0 ghz processor，4 gb ram，and an 80 gb hard drive. a location appliance has been incorporated into the network and is being monitored by the cisco wcs. there are 3000 devices to be tracked but not all of them are being tracked on the cisco wcs. What can be done to correct the problem？（）

单项选择题 You are troubleshooting a problem with a cisco 7920 wireless ip phone that is causing the phone to drop calls. the problem appears to be a roaming bandwidth issuE.  in order to verify what kind of issue it is， you decide to increase the bandwidth reserved for roaming on the wlan controller to the maximum. What level do you set the bandwidth to？（）