CCNA Exams

Oh man! Ad-blocking software has been detected! :'(

This website is run by the community, for the community... and it needs advertisements in order to keep running. Blocking our ads means your killing our stats!
Please disable your ad-block, or become a premium member to hide all advertisements and this notice.

Perhaps a silly question, but when sitting a Cisco exam do you have access to a calculator on the PC, I can understand knowing things like number of hosts off the top of your head but converting 191 to hex etc??

 

Oh man! Ad-blocking software has been detected! :'(

This website is run by the community, for the community... and it needs advertisements in order to keep running. Blocking our ads means your killing our stats!
Please disable your ad-block, or become a premium member to hide all advertisements and this notice.

I don't believe so, or at least thats what we found out last time the question was asked.

 

The way I've done this so far is to use the paper provided to write down a list of the bit weightings (i.e. bit 7 = 128 ) so as to make it quicker to convert back and forth.

Harry.

 

its simple like harry says on your paper write this for binary to dec and dec to binary conversion

128 64 32 16 8 4 2 1


now to use it write the binary underneath

0 0 0 0 0 0 1 1 which is the number 3

and to convert dec to binary again using those numbers say we have 12 to binary:

0 0 0 0 1 1 0 0 because 128,64,32 & 16 are all too big so 8 goes in and we left with 4 and 4 is the next number so a 1 there. See it?? confusing would have made sense if you were infront of me!

Hex is easy to remember on your paper write

0 = 0
1 = 1
2 = 2
3 = 3
4 = 4
5 = 5
6 = 6
7 = 7
8 = 8
9 = 9
10 = A
11 = B
12 = C
13 = D
14 = E
15 = F

 

baldie,

No, you do not have access to the Microsoft Calculator program.

 

Thanks for the replies, Binary to decimal and vice versa is fine but how do you work out hex, i.e. how would you work out decimal 157 to hex or decimal 201 to hex??

Thanks

 

its been a while but look here... lets try

157 for example:

first you put it into binary = 10011101

now i want you to split them into groups of 4 bits so : 1001 1101

from here i want you to work with 4 bits at a time and the weights are: 8 4 2 1
now put the binary under here: 1 0 0 1
now that is 8+1 = 9

the second one 1 1 0 1
now thats 8+4+1=13 = D

so 157 = 9D in hex

 

Nice one....so 201 would be

11001001

Split as 1100 and 1001

1100 = 12
1001 = 9

So Hex value would be C9?

Is that right?

 

yip!

if you could kindly post me a few cold beers ill highly appreciate it!

 

yep u got that right... practice some more and u'll be fine with the hex thing...

 

Beers are on their way!
Shame the CCNA Intro isn't just hex questions really!

 

Oh well, I will never be CCNA certified 'cos I am hopelessly lost without a calculator!!!!!!!!!!!!!