#1
IPv4 Subnetting for Beginners: Your Complete Guide to Master IP Subnetting in 4 Simple Steps
Ramon Nastase
#2
IPv6 Fundamentals: Learn the Basics of How IPv6 Works, IPv6 Addresses and IPv6 Subnetting
Ramon Nastase
#3
Cisco CCNA Command Guide: An Introductory Guide for CCNA & Computer Networking Beginners
Ramon Nastase