Cisco Certified Network Associate (CCNA) Practice Exam

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What is the summary address sent from router A in a VLSM scheme?

172.16.128.0/18
172.16.32.0/24
172.16.0.0/16
172.16.64.0/18

The correct answer is: 172.16.0.0/16

In a Variable Length Subnet Masking (VLSM) scheme, the summary address is used to condense multiple subnets into a single routing entry, known as route summarization or supernetting. The primary goal of summarization is to minimize the size of routing tables and improve routing efficiency. The summary address 172.16.0.0/16 effectively encapsulates all potential subnets within the 172.16.0.0 network, ranging from 172.16.0.0 to 172.16.255.255. This means it can include various subnet configurations, making it a suitable choice in VLSM where different subnet sizes can be utilized under the same major address block. Other addresses listed do not summarize the entire range of relevant subnets as effectively. For instance, 172.16.128.0/18, 172.16.32.0/24, and 172.16.64.0/18 each specify narrower ranges, which do not encompass the full network scope provided by 172.16.0.0/16. Therefore, while those addresses could potentially relate to specific subnets, they do not serve the purpose of summarizing the broader network range that