多项选择题 A network is deployed using best practices of the enterprise campus network model， including users with desktop computers connected via IP phones. Given that all components are QoS-capable，  where are the two optimal locations for trust boundaries to be configured by the network administrator？（）

单项选择题 Wireless has been operating correctly in the campus infrastructure. After the wireless controllers are upgraded from LWAPP to CAPWAP， access points no longer boot and operate normally.  What is the most likely issue causing this problem？（）

单项选择题 A standalone wireless AP solution is being installed into the campus infrastructure. The access points appear to boot correctly， however， wireless clients are not obtaining correct access. You verify that the local switch configuration connected to the access point appears as the following：  interface ethernet 0/1  switchport access vlan 10  switchport mode access  spanning-tree portfast  mls qos trust dscp  What is the most likely issue causing the problem？（）