Roady
07-18-2005, 01:25 PM
Ok as im learnign subnetting as pat of my CCNA I discovered an excellent web page @ http://www.swcp.com/~jgentry/topo/unit3.htm. This shows how subnetting is worked in binery form and how it is calculated.
If you read it and get a good understanding of the page, in Advanced Subnetting part nr the bottom of this part it explains how to work out the range of IP addresses for a subnet of 192.168.32.0, but the binary code after doing the logical calculation for the example given is 0011111 which if you look closely is only seven binary digits (Should be eight bits as we know) Which if you add up using the 128,64,32,16.....etc powers, gives you 31 when the actuall answer is 63 as you add 32+16+8+4+2+1 = 63 (which is eight bits used), but thers only five "1"s. Could be a spelling mistake but confused me for a bit
Can anyone take a look and see if you agree with me.
If you read it and get a good understanding of the page, in Advanced Subnetting part nr the bottom of this part it explains how to work out the range of IP addresses for a subnet of 192.168.32.0, but the binary code after doing the logical calculation for the example given is 0011111 which if you look closely is only seven binary digits (Should be eight bits as we know) Which if you add up using the 128,64,32,16.....etc powers, gives you 31 when the actuall answer is 63 as you add 32+16+8+4+2+1 = 63 (which is eight bits used), but thers only five "1"s. Could be a spelling mistake but confused me for a bit
Can anyone take a look and see if you agree with me.