I am trying to figure out how to summarize the subnet for ip route. I am following this information here… http://www.pearsonitcertification.com/articles/article.aspx?p=2169746&seqNum=7
It basically is having me change the "interesting octet" into binary, and then find the common barrier between the 1 and 0. However I am unsure since one of them is 0's. The IP's are..
10.10.0.1
10.10.2.1
10.10.4.1
10.10.6.1
When I convert them into binary I get
0 = 0000 0000
2 = 0000 0010
4 = 0000 0100
6 = 0000 0110
Would it end up being 10.10.0.0/21?
Best Answer
Yes. The number of bits in common is the number you are looking for. You left off the first 16 bits (they are in common). plus the 5 bits in common you show here is 21 bits in common.