Refer to the exhibit. In this VLSM addressing scheme, what summary address would be sent from router A?
A.
172.16.0.0 /16
B.
172.16.0.0 /20
C.
172.16.0.0 /24
D.
172.32.0.0 /16
E.
172.32.0.0 /17
F.
172.64.0.0 /16
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Explanation
Router A receives 3 subnets: 172.16.64.0/18, 172.16.32.0/24 and 172.16.128.0/18.
All these 3 subnets have the same form of 172.16.x.x so our summarized subnet must be also in that form -> Only A, B or C is correct.
The smallest subnet mask of these 3 subnets is /18 so our summarized subnet must also have its subnet mask equal or smaller than /18.
-> Only answer A has these 2 conditions -> A is correct.
This is the end for VLSM, Classful & Classless routing.
The topic of route summarisation shall be covered in another post.
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no B is correct
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