An organization's routing table has: 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 prefixes can be used together to aggregate all these subnets? A. 12.20.164.0/20 B. 12.20.164.0/22 C. 12.20.164.0/21 D. 12.20.168.0/22
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Correct answer: D. B and D Only
Explanation
The subnets cover third octets 164–167 (164/22 includes 166/23) and 168–171 (168/23 and 170/23). These are exactly 12.20.164.0/22 and 12.20.168.0/22. A /20 or /21 starting at 164 is not aligned to a valid block boundary.
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