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?（）
- A、MPLS
- B、framerelay
- C、leaseDline
- D、metroethernet
- E、widetransport
正确答案:A
答案解析:有
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