Therefore, 4094 usable IP addresses exist in a /20 subnet.
Option breakdown:
A. 2047 → Incorrect, would apply to a /21 subnet (2048 total - 1)
B. 4096 → Incorrect, total IPs, not usable
C. 2048 → Incorrect
D. 2046 → Incorrect
E. 4094 →✔Correct
Extract from MTCNA Course Material – IP Addressing/Subnetting Section:
"Number of usable hosts = 2^host-bits - 2 (network and broadcast). For /20, 2^12 - 2 = 4094."
Extract from Terry Combs Notes – IP Subnet Calculations:
“A /20 gives 4096 IPs total, 4094 usable.”
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