Cisco 200-125 Exam

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
Answer: Option A.
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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