CompTIA Tech+ (FC0-U71)InfrastructureMedium
A network administrator is configuring a small office LAN and needs to assign an IP address range that is NOT routable on the public internet. Which address range should be used?
- A192.168.0.0/16
- B203.0.113.0/24
- C172.32.0.0/16
- D8.8.8.0/24
Show answer & explanationAnswer & explanation
Correct answer: A. 192.168.0.0/16
192.168.0.0/16 falls within the private IP address ranges defined by RFC 1918 and is not routable on the public internet. The other ranges are either public or fall outside the private reserved blocks (172.32.0.0 is outside the 172.16.0.0–172.31.255.255 private range).
Why the other options are wrong
- B. 203.0.113.0/24 is a public documentation range.
- C. 172.32.0.0 is outside the private 172.16.0.0-172.31.255.255 block.
- D. 8.8.8.0/24 is a public range used by Google DNS.
Private IP Ranges (RFC 1918)
Reserved IP address blocks not routed on the public internet, used for internal networks.
- 10.0.0.0/8
- 172.16.0.0/12 (172.16.0.0-172.31.255.255)
- 192.168.0.0/16
- Require NAT to reach the internet
Memory trick: Think '10-172-192' as the private club membership numbers.