Training the Next Generation of IT Engineers
Number Systems
Numbers are symbols that we use to represent quantities. Binary, octal, decimal and hexadecimal are four number systems used frequently in computing and networking. This set of short tutorials on number systems will explore the binary, decimal and hexadecimal number systems. You will need to understand all of them for the CCNA exam, but most especially binary and hexadecimal. Decimal is the human numbering system we display IPv4 addresses. Binary is used for calculating network masks, hexadecimal is used to display Ethernet MAC addresses and IPv6 addresses.
Welcome to our CCNA Lessons Tutorial Series from InetDaemon.Com. These lessons and tutorials are designed to be short and simple so you can study for your CCNA in less than 20 minutes a day. Subscribe to our mailing list to get these posts in your mailbox every Monday, Wednesday and Friday.
The CCNA certification is the primary certification that managers look for when they hire Network Operations personnel. According to GlassDoor.com, the median income for Network Engineers is just over $66,000 per year (2012), and more with a government clearance and a few years experience. The CCNA exam is relatively inexpensive, and you can take the exam at any Cisco-authorized testing center. InetDaemon.Com has a full set of tutorials and guides to help you study for, and pass the CCNA are here at InetDaemon.Com.
Friday, the InetDaemon.Com website crashed. HTTP 500 errors all over the place and no WordPress, just blank error pages. Oh, NO! What do I do!?!
MAGICAL JELLY BEAN KEYFINDER
FROM: Magical Jelly Bean Software
(http://www.magicaljellybean.com/keyfinder/)
PRICE: FREE
SUPPORTED OS: SEE BELOW
RECOMMENDATION: Highly Recommended
Sometimes you have to recover the key to your Microsoft Windows OS, or your Windows Office install, or Photoshop etc. The Magical Jelly Bean Keyfinder extracts license keys for you. Even when you don’t, it’s a good idea to run this software, save the keys to a file, print the file and store it with your installation CD’s, just in case.
Jelly Bean will extract, from the registry:
- Windows 95, 98, ME, 2000, XP, Vista 7 license keys
- Windows Servers 2000, 2003, 2008 license keys
- Office XP, 2003, 2007 license keys
- Even extracts license keys from the registry hive of any drive connected to the computer. Pull out the hard drive from a blown computer plug it into a working computer and recover the keys!
- Save as .txt or .csv
Jelly Bean is free (as in free beer) and is open source and I highly recommend you download it, extract your keys to a file, print the file and store it somewhere safe with your installation CD’s, just in case.
I know, I know, I’ve warned you twice. But its that important.