Question

What is the first address of group 3?

(a) 190.100.128.63/26

(b) 190.100.128.0/26

(c) 190.100.128.64/26

(d) 190.100.128.127/25

I have been asked this question in an interview for internship.

I'd like to ask this question from Designing Subnets in section Internet Protocol, Network Addressing and Transport Level Security of Cryptograph & Network Security

Answer 1

Right answer is (b) 190.100.128.0/26

To elaborate: Find the IP address using basic networking concepts.