So what is IP subnet zero and why should you care? I guarantee that by the time you have gone through module 4 and the easy way to subnet a few times you will know more that 99% of network engineers in the IT industry. They say they know how to subnet but they can't really and those who can seem to take two hours to do what will take your two minutes.

Learn this module and learn it well. It will come in handy every day for you in your role as a network engineeer.

Please read the CCNP IPv6 notes for information on IPv6 which is a CCNA exam requirement.