Question

Four contiguous Class C networks — 192.168.4.0/24, 192.168.5.0/24, 192.168.6.0/24, and 192.168.7.0/24 — need to be aggregated (supernetted) into a single route advertisement. What is the correct supernet address and mask?

A 192.168.4.0/21
B 192.168.4.0/22
C 192.168.4.0/24
D 192.168.4.0/23
E 192.168.0.0/22
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