JN0-102 · Question #24
Which two prefixes would summarize the networks shown below? (Choose two.) 192.168.1.0/24 192.168.2.0/24 192.168.3.0/24
The correct answer is B. 192.168.0.0/22 D. 192.168.0.0/21. Network summarization involves finding a common, shorter prefix that encompasses all specified networks. Both 192.168.0.0/22 and 192.168.0.0/21 successfully include the given /24 networks.
Question
Which two prefixes would summarize the networks shown below? (Choose two.) 192.168.1.0/24 192.168.2.0/24 192.168.3.0/24
Options
- A192.168.0.0/23
- B192.168.0.0/22
- C192.168.0.0/24
- D192.168.0.0/21
How the community answered
(50 responses)- A12% (6)
- B82% (41)
- C6% (3)
Why each option
Network summarization involves finding a common, shorter prefix that encompasses all specified networks. Both 192.168.0.0/22 and 192.168.0.0/21 successfully include the given /24 networks.
192.168.0.0/23 covers 192.168.0.0 to 192.168.1.255, which does not include 192.168.2.0/24 or 192.168.3.0/24.
192.168.0.0/22 covers the IP range from 192.168.0.0 to 192.168.3.255, which successfully summarizes 192.168.1.0/24, 192.168.2.0/24, and 192.168.3.0/24.
192.168.0.0/24 is too specific and cannot summarize the other /24 networks (192.168.1.0/24, 192.168.2.0/24, 192.168.3.0/24).
192.168.0.0/21 covers the IP range from 192.168.0.0 to 192.168.7.255, which also successfully summarizes the three given networks as they are all contained within this larger block.
Concept tested: Route summarization (CIDR)
Source: https://www.cisco.com/c/en/us/td/docs/ios/12_2/ip/configuration/guide/fipr_c/icfar_c.html
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