多项选择题 Cisco collaboration applications and services can be hosted in A number of ways, which three are valid hosting models?（）

单项选择题 Which wireless technology would a customer choose to position them for bandwidth-intensive applications?（）

单项选择题 A customer asks for help choosing their WAN technology, the customer is looking for A solution that can be used across very long distances, provides QoS and VPN support, and is sensitive to their budgeting needs , which WAN technology would you recommend?（）