Cisco Certified Network Associate (CCNA) Practice Exam

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What is the appropriate summarization for the routes 10.0.0.0, 10.0.1.0, 10.0.2.0, and 10.0.3.0?

10.0.0.0 /24
10.0.0.0 /22
10.0.0.0 /26
10.0.0.0 /21

The correct answer is: 10.0.0.0 /22

To determine the appropriate summarization for the routes 10.0.0.0, 10.0.1.0, 10.0.2.0, and 10.0.3.0, you need to analyze the addresses in binary to find the common prefix. The binary representation of the addresses is as follows: - 10.0.0.0 → 00001010.00000000.00000000.00000000 - 10.0.1.0 → 00001010.00000000.00000001.00000000 - 10.0.2.0 → 00001010.00000000.00000010.00000000 - 10.0.3.0 → 00001010.00000000.00000011.00000000 When comparing these, the first 22 bits (00001010.00000000.000000) are common across all four addresses. Therefore, they can be summarized to the network address 10.0.0.0 with a subnet mask of /22. This summarization encompasses all addresses from 10.