单选题Which of the following is the purpose of QoS?（）ALoad balance traffic across multiple LAN and WAN links.BIncrease speed of network traffic.CClassify, mark, and prioritize traffic on WAN and LAN linksDGuarantee traffic delivery.
单选题
Which of the following is the purpose of QoS?（）
A
Load balance traffic across multiple LAN and WAN links.
B
Increase speed of network traffic.
C
Classify, mark, and prioritize traffic on WAN and LAN links
D
Guarantee traffic delivery.
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