On the Cisco ASR9K router, when using the bandwidth command to specify the minimum
guaranteed bandwidth to be allocated for a specific class of traffic, what will be used as the queuing
algorithm?

A.
custom queuing

B.
CBWFQ

C.
WFQ

D.
FIFO

E.
priority queuing

Explanation:
Class based weighted fair queuing (CB-WFQ) was initially released without the support of a priority
queuing system, thus it could not guarantee the delay and jitter (delay variation) requirements of
real-time, interactive voice and video conversations. Since for CBWFQ, the weight for a packet
belonging to a specific class is derived from the bandwidth assigned to the class, which in turn
determines the order in which packets are sent.
All packets are serviced fairly based on weight and no class of packets may be granted strict priority.
This scheme poses problems for voice traffic that is largely intolerant of delay, especially variation in
delay