Refer to the exhibit. In this VLSM addressing scheme, what summary address would be sent from router A?

Question:
Refer to the exhibit. In this VLSM addressing scheme, what summary address would be sent from router A?

• 172.16.0.0 /16
• 172.16.0.0 /20
• 172.16.0.0 /24
• 172.32.0.0 /16
• 172.32.0.0 /17
• 172.64.0.0 /16

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. 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 ->

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