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Consider routing table of an organization’s router shown below:
Subnet Number | Subnet Mask | Next Hop
12.20.164.0 | 255.255.252.0 | R1
12.20.170.0 | 255.255.254.0 | R2
12.20.168.0 | 255.255.254.0 | Interface 0
12.20.166.0 | 255.255.254.0 | Interface 1
default | | R3
Which of the following prefixes in CIDR notation can be collectively used to correctly aggregate all of the subnets in the routing table?
- 12.20.164.0/20
- 12.20.164.0/22
- 12.20.164.0/21
- 12.20.168.0/22
Correct answer: 12.20.164.0/21
Solution
The prefix 12.20.164.0/21 encompasses all the specified subnets by covering the address range from 12.20.160.0 to 12.20.167.255, which includes 12.20.164.0/22, 12.20.170.0/23, 12.20.168.0/23, and 12.20.166.0/23, thus allowing for efficient aggregation.
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