Which of the following IPv4 addresses falls within the private address space specified by RFC 1918 and therefore cannot be routed across the public Internet?
203.0.113.10
8.8.8.8
192.168.1.1
172.34.0.5
RFC 1918 designates three private IPv4 blocks: 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16. Only addresses inside these ranges are intended for internal networks and are filtered by Internet routers. 192.168.1.1 sits inside 192.168.0.0/16, so it is private. The other options (172.34.0.5, 203.0.113.10, 8.8.8.8) lie outside the private ranges and are publicly routable (203.0.113.0/24 and 198.51.100.0/24 are documentation ranges but still public).
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