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Cisco Certified Network Associate (CCNA) · Cisco
Select 2 answers.
This question asks for 2 answers, but our data marks only 1. Compare with the community discussion below for the full answer.
Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
There is no explanation as to why option B is not correct. The actual answer is both B and A. If the second subnet is using 10.70.148.1 with a subnet mask of 255.255.254.0, then the first subnet is 10.70.147.1 (network address: 10.70.147.0) only. Also, please read the question carefully: the first subnet must support 24 hosts, so option B [10.70.147.1/27] is correct. What is the logic behind using the first and second subnets starting from X.X.158.X? Even though it meets the requirement, the question specifically asks to use the first subnet with 24 hosts, so we should use the first subnet as X.X.147.X and the second subnet as X.X.148.0.
If you want to find out the number of subnets from /19, then you need /32-19 which equals 13 -8 (for 256 hosts you always need 8). That gives 5 and 2 to the power of 5 = 32 subnets.
Definitely right answers with no doubt.