What is the subnet id of a host with an IP address 172.16.66.0/21?

by
Question:

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.

172.16.0.0

Answer» c. 172.16.64.0

Note: The above multiple-choice question is for all general and Competitive Exams in India.