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D6 · Network+

What is IPv4 addressing?

IPv4 private ranges (RFC 1918): 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16. Loopback: 127.0.0.0/8. APIPA: 169.254.0.0/16 (no DHCP server found).
Know private ranges for the exam. APIPA (169.254.x.x) = DHCP failed — check DHCP server. Loopback (127.0.0.1) = local machine self-reference. Class A: 0-127, Class B: 128-191, Class C: 192-223. Classes are legacy — CIDR is the modern standard.

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