Archive for powers of 2

Binary: The KEYS to the KINGDOM! (Part 1)

Posted in Cisco Certification with tags , , , , , , , , , , , , , , , , , , , , , , , , , , , , , on March 18, 2011 by jjrinehart

Sounds corny, right, the idea of a single magic bullet or secret trick to the CCNA/NP certification?  It would be, except that it actually IS!  One of the many things I did wrong as I studied was not having a solid understanding of binary math.  As human beings, we see through the lenses of decimal—“Base 10”–probably because that’s the number of  digits (thumbs and fingers) that we use to count on.  In the world of computer technology, however, decimal means almost nothing, unless you count the forced translations we see that mask the underlying process.  All computing devices, whether workstations, servers, routers, switches, or firewalls, think in terms of two’s–simply because a circuit can only be on or off.  Once you learn to think in binary terms, just about everything else in computing actually makes perfect sense, including IP addressing, subnetting, routing protocols, and even applications.  The key to mastering something new and unfamiliar is to compare it to something you know well, and in numbering systems that would be decimal.  I have to frankly admit that I do not consider math to be my strongest subject, so if I can make sense of tis, everyone else should easily grasp it.  In my next post, I will walk through the logic, and that should make understanding this topic musch easier.