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、wide transport
- B、metroethernet
- C、frame relay
- D、leaseD line
- E、MPLS
正确答案:E
答案解析:有
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