HEX

xetrev

Is hex on the ccna? if so anyone have a good tuturial on converting binary to hex and vice versa?

fusebox

Well basically, if you have an 8 bit binary number, you split it into two nibbles (4bits). Then convert those four bits into the Hex number.

eg: Hex goes as follows;

0000 - 0
0001 - 1
0010 - 2
0011 - 3
0100 4
0101 5
0110 6
0111 7
1000 8
1001 9
1010 A
1011 B
1100 C
1101 D
1110 E
1111 F


now supposing you had a the following 8bit binary number;

10110011.... So split this into two... you get 1011 & 0011 now from the above, this equals B & 3 Therefore the equivalent Hex no. is B3

Does that help.?

xetrev

yah thats cake, 20x easier then i thought.
so 10101010 would be 170
split that into 1010 and 1010
which = AA?

Ricka182

That is mad easy to remember...cool.

fusebox

yep... thats pretty much it.

xetrev

thanks i am taking the exam thursday and while i was cramming i forgot that i did not know how to do the hex converstions. they are simple!

porengo

Good luck on your exam!

shadown7

Good luck on your exam!!

Fu Loser

Heres how I remember Hex.

take four bits and create list of binary 0-15

then take numbers 10-15.

A=10
B=11
C=12
D=13
E=14
F=15

When you take your exam and you are writing everything you can remember on your white sheet before the test. The last 2 things (that I think) you should write out is a good complete IP table and then Hex down a side of the paper.

A complete IP and Hex table will save you time and help prevent dumb math errors that you may make during your test ( assuming ou make the tables correct )

ADDED:

go from Hex to decimal using this formula.

(16*x)+z

x = First Hex character
y = Second Hex Character

example. FA

(16*15)+10 = 250

example. BD

(16*11)+13 = 189