explanation for the question

pritish069

What is the first valid host on the subnetwork that the node 172.20.209.85/20 belongs to?
Answer: 172.20.208.1

is there any possible method to find this ans

steveyeung

172.20.209.85/20=172.20.1101|0001.85
network address=172.20.208.0/20
first host address=172.20.208.1

FloOz

/20 is an increment of 16 in the 3rd octet

Therefore the range of addresses for that particular subnet are 172.20.208.0 - 172.20.223.255

mendysue

This has been my favorite explanation.

http://www.techexams.net/forums/ccna-ccent/38772-subnetting-made-easy.html

pritish069

subnetting made easy....superb