What are two major sources of delay that can be managed by QoS in voice-enabled networks？（）
- Apropagation delay
- Bvoice packet serialization delay
- Ccongested egress queues
- Dheader overhead
- Epackets dropped because of CRC error
问题
What are two major&#
参考解析：
分类：CCNP(642-845)题库
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