A.to provide a mechanism to dynamically assign vlan membership to switch ports
B.to allow traffic to be carried from multiple vlans over a single link between switches
C.to allow native vlan information to be carried over a trunk link
D.to provide a mechanism to manually assign vlan membership to switch ports
E.to allow for managing the additions，deletions，and changes of vlans between switchs

A.IP路由未啟用
B.靜態(tài)路由配置錯誤
C.該網(wǎng)絡(luò)還沒有完全收斂
D.咖啡館的快速以太網(wǎng)接口被禁用
E.對咖啡的路由表尚未更新
F.鄰居關(guān)系表不正確更新