CCNA 200-301 Official Cert Guide, Volume 1, 2nd Edition

Appendix M

Variable-Length Subnet Masks

Note

This appendix contains content that was published as a chapter in one of the past editions of this book or a related book. The author includes this appendix with the current edition as extra reading for anyone interested in learning more. However, note that the content in this appendix has not been edited since it was published in the earlier edition, so references to exams and exam topics, and to other chapters, will be outdated. This appendix was previously published as Chapter 22 of the book CCENT/CCNA ICND1 100-105 Official Cert Guide, published in 2016.

IPv4 addressing and subnetting use a lot of terms, a lot of small math steps, and a lot of concepts that fit together. While learning those ...