The benefits of Variable Length Subnet Masks

Discuss ONE of the Following Topics: What are the benefits of Variable Length Subnet Masks (VSLMs)? Of the four diagnostic steps used in the book, where would you find the most issues? Does one step cause more issues than others? Are invalid hosts labeled in your network a big issue? What can happen if this persists? What are your biggest fears with IP addressing? Where do you think this may be the biggest holdup in administration?