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5062 Views 4 Replies Latest reply: Oct 4, 2011 3:19 AM by Uttam RSS

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Understanding the Configuration Register Bits

Oct 2, 2011 1:02 PM

Uttam 430 posts since
Mar 27, 2011

Hi

 

I am reading Todd Lammle for CCNA

 

I got stuck when I started understanding the configuration register bits

 

as we know configuration register is 16 bits long, the default configuration on Cisco router is 0x2102 which means bits 13,8 and 1 are onn

as per the table below each set is of 4 bits is read in binary with a value of 8,4,2,1

 

 

Config Register #2102
Bit Number15 14 13 12   11 10 9 8   7 6 5 4   3 2 1 0  
Binary0    0    1    0   0    0   0 1   0 0 0 0   0 0 1 0 

 

 

 

My question is, where this 8,4,2,1 came from ?

 

 

 

 

please help

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