A question from the ONT Official Exam Cert Guide...
Examine the output shown:
!
policy-map AutoQoS-Policy
class AutoQoS-Voice
priority percent 20
set dscp ef
class AutoQoS-Signaling
bandwidth remaining percent 5
set dscp cs3
class AutoQoS-Transactional
bandwidth remaining percent 40
random-detect dscp-based
set dscp af21
class AutoQoS-Bulk
bandwidth remaining percent 20
random-detect dscp-based
set dscp af11
class AutoQoS-Scavenger
bandwidth remaining percent 1
set dscp cs1
class class-default
fair-queue
!
Based on this configuration, how much bandwidth would be allocated to FTP traffic if the policy was applied to interface Fa1/0/0?
A.) 5 Mb
B.) 8 Mb
C.) 20 Mb
D.) 1 Mb
E.) 40 Mb
F.) 16 Mb
Now they say A. with an explanation as follows:
The Bulk class includes FTP. The Bulk class has been allocated 20% of the remaining bandwidth, after allocating 20% to the Priority queue, 5% to Signaling and 40% to Transactional. 20% percent of the remaining 26 Mbps is 5Mbs.
Now I was under the impression that
bandwidth remaining percent was based off the available bandwidth, so I figure the following:
max-reserved-bandwidth is default 75% and the priority queue is at 20%, so our available bandwidth on a FE interface is 55000kbps (100000kbps - 45%)
Would that not mean that the AutoQoS-Bulk class would get 55000 * .2 = 11000kbps?
I'm just not seeing how they are using 20% of 26Mbps and getting 5Mbps.
I appreciate the help.
