Cisco Certification Guide

Cisco certification applicants, especially CCNA candidates, need to master binary mathematics. Including conversions, for example binary-to-decimal and decimal-to-binary, in addition to scenarios involving VLSM and subletting.

There is another transformation which might rear its nasty head in your Cisco test, however, which entails hexadecimal numbering.

Newcomers into hexadecimal numbering tend to be confused about how a letter of the alphabet can possibly represent a few. Worse, they could be intimidated – after all, there has to be some incredibly complex formula involved in representing the decimal 11 using the letter”b”, correct?


The numbering system we use daily, decimal, concerns itself with components of ten. The number indicates the number of units of ten, one, and one have Though we seldom stop to consider it this way, if you browse a number from right to left. In other words, the number”15″ consists of five components of one plus one component of ten. The amount”289″ is nine components of a single, eight units of eight, and 2 components of 1. Simple enough!

Hex numbers are read substantially the exact same style, except that the components are components of 16. The number”15″ in hex is read as with five components of one and a single unit of sixteen. The amount”289″ in hex consists of two units of a single, eight units of sixteen, and 2 components of 256 (16 x 16).

Now you know where the letters fall into place from the hexadecimal numbering planet, you will have little trouble converting hex to decimal and decimal to hex – should you exercise.

How can you convert the Publish 27 into hex? You may observe that there is 1 component in this match of 16 . This can be represented in hex with”1b” – one component of sixteen, 11 units of a single.

Converting the decimal 322 into hex isn’t a issue. There’s 1 component of 256; 66 is left by which. There are 2 components of one, or four components of 16 which leaves two. The hex equivalent of the 322 is that the hex figure 142 – one unit of 256, four components of 32, and two units of two.

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