Shouldn’t they be in the form of a question?



Which of these would be a valid RFC 1918 address?

A) 127.0.0.1

B) 172.20.77.251

C) 192.168.1.265

D) 224.0.0.1

E) I didn’t really request these comments


The answer: B) 172.20.77.251

A list of non-routed (private) IP addresses is defined in RFC 1918, and include 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16.

Want to know more? Watch “TCP/IP Subnets.”

Our TCP/IP networks are separated into many subnets. In this video, you’ll learn about the fundamentals of IP subnetting and how legacy class-based and modern classless subnetting is used to connect the worldwide Internet.