Qos Interview Questions?

1. What is QOS and why it is required?
2. What is layer2 qos and layer3 qos?
3. What is tail drop?
4. Describe methods of QOS?
5. What is hardware QOS and Software QOS?
6. Difference between a policer and a shaper?
7. What is token bucket algorithm?
8. Where to define the markings?
9. Does QOS increase the load of the equipment?
10. What is TOS and IP DSCP?
11. what are the different classes available?
12. How to calculate the decimal value of classess?
13. What is the difference between priority and bandwidth command?
14. What is low latecy queueing?
15. what is class based weighted fair queuing?
16. What is first in first out queue (FIFO)?
17. What is fair queue?
18. If I give teh ip precendence five to data traffic, what will happen?

Other Useful Questions
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NodeB To RNC Communication Over MPLS Cloud

I am mulling on the current 3G network which doesn't give much room to the MPLS technology. But MPLS could be used to delivery nodeB traffic to RNC over MPLS cloud down the year. In the depicted figure, 3^rd party MPLS network is used instead of single aggregator router. 

By adding 3^rd party MPLS network or own MPLS network; providers can get the benefits of Traffic Engineering, QOS and Fast Reroute. The PWE3 again plays a vital role to deliver the services over MPLS cloud.  

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How nodeB communicates to RNC in 3G network?

In the previous post, a aggregator router is added to reduce the cost and the same router is also responsible for making communication possible between the nodeB and RNC side. As in the depicted diagram, ch-STM port is used towards nodeB aggregation and un Ch-STM port is used at RNC side. The reason for using un Ch-STM port at RNC side, to overbook the bandwidth. In case of ch-STM overbooking is not possible.

NodeB is allocating more than 2 E1s and to aggregate the nodeB bandwidth IMA groups are being used. The IMA group from ch-STM port is carried over PWE3 circuit towards the un Ch-STM port. By doing this we can aggregate more IMA groups towards the RNC side. This all calculation depends on the number of user and traffic. 

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