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IP Summarization/CCNA how to do summarization and please show me with an example of it.?

author
Noor Sadat
,
ZAP
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Can You answer this question?
author
Mr. Piyush Kataria

Summarization simply means adding multiple networks to form a single network. Its opposite of subnetting.

For eg. We have to summarize these subnets:-

10.1.1.0/24 10.1.2.0/26 10.1.3.0/27

Step1:- Forget subnetmask. Step2:- Check only network part.Choose the 1st and last network out of given options. Here we have 10.1.1.0 and 10.1.3.0 as 10.1.2.0 lies in between. Step3:- convert 10.1.1.0 and 10.1.3.0 in binary and look for common bits. 10.1.1.0- 00001010.00000001.00000001.00000000 10.1.3.0- 00001010.00000001.00000011.00000000 AND OPERATION SUMM   -00001010.00000001.00000000.00000000 Decimal- 10.1.0.0/22 We have here 22 bits common between both address, so we select prefix length /22.

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