If voice and data traffic will be sent and received via a WAN links， what must be configured to provide a certain amount of dedicated bandwidth and to prioritize the voice traffic over other types of network traffic？（）
- A、IPSec VPN
- B、QoS mechanism
- C、Firewall
- D、NAT
- E、EIGRP routing protocol
- F、Static routing
正确答案:B
答案解析:有
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