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What is the subnet id of a host with an IP address 172.16.66.0/21?(a) 172.16.36.0(b) 172.16.48.0(c) 172.16.64.0(d) 172.16.0.0This question was posed to me by my college professor while I was bunking the class.This is a very interesting question from Designing Subnet Masks topic in portion TCP/IP Protocol Suite of Computer Network

Answer»

Right ANSWER is (c) 172.16.64.0

Easiest explanation: A /21 is 255.255.248.0, which means we have a block SIZE of 8 in the third octet, so we just count by 8 until we reach 66. The SUBNET in this question is 64.0. The next subnet is 72.0, so the BROADCAST address of the 64 subnet is 71.255.



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