I recently took my ONT exam.
But i still have confusions on some questions
1. How scheduler works between classes in CBWFQ if there is no LLQ?
2.ONT guide says that there is only one LLQ can be configured in one policy-map. But QOS exam rejects this theory. I managed to create 2 LLQ in one policy-map. So how scheduler works in this case? Which LLQ gets first priority? FIFO?
3.As we know default queuing strategy on Ethernet interfaces are FIFO.This is hardware queuing. Even when we put WFQ in Ethernet interface we just enable software queuing and nothing changes with hardware queuing. It still remains FIFO is it right? The Serial interfaces have by default wfq. Does it mean software queuing only? My understanding remain the same that hardware queuing is always FIFO, whatever interface we are talking about.
4. From QOS study guide.
CBWFQ says that only class-default can be WFQ or FIFO. Other classes uses FIFO strategy! But when we configure CBWFQ on serial interfaces(WFQ default), the "show policy-map interface xxxx" command shows WFQ queuing in each class! Is it Bug?