Like the other posters, I don't believe the answer is correct, not does the question provide sufficient information. Further, on most platforms, I believe, FQ within class-default makes the answer almost impossible to know since actual bandwidth for defined classes appears to be impacted by the number of FQ flows on those platforms.
For the most part, ignoring the above, we can try to calculate the minimal bandwidth allowance for FTP as follows:
First, we need to set aside bandwidth reserved for non-user defined classes. The default is 25%. (NB: The default can be changed.)
Assuming the fast Ethernet is 100 Mbps, this leaves us with 75 Mbps. (The rest works, I think, as follows.)
The LLQ classes, only one defined in the question, allocate 20% of the 100 Mbps (20 Mbps) which leaves us with 55 Mbps of "remaining" bandwidth.
Assuming FTP maps into the Bulk class, bandwidth remaining percent 20 (of the 55), should reserve a minimal of 11 Mbps but the sum of the percentages of all the other defined classes only total 66% remaining, not 100%. So, where does that other 33% (18.15 Mbps) of 55 Mbps go?
I've understood undefined bandwidth is proportioned the same as the classes proportion their bandwidth but there's Cisco documentation that also notes the undefined bandwidth is equally distributed to all the classes. So, with the latter, Bulk gets its 11 plus another 4.5 (1/4 of 18.15), about 16 Mbps. With the former, Bulk again gets its 11 plus antoher 5.5 (20/66% of 18.15). All this assumes all defined classes are demanding all possible bandwidth and FQ within class-default is only limited to 25% of the 100 Mbps (which, again, don't believe it's true for most platforms).
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