CompTIA 220-801 Certification Practice Test

Answer - A - Class A addresses start with the first octet ranging from 0 to 126 and have a default subnet mask of 255.0.0.0.

Key Takeaway: In Class A networks the first bit 0 and the next 7 bits are used for network identification. The remaining 24 bits are used for host identification, which means 16,777,214 hosts can be located on a single network. Class B addresses have a first octet ranging from 128 to 191 and have a default subnet mask of 255.255.0.0. Class C addresses have a first octet ranging from 192 to 223 and have a default subnet mask of 255.255.255.0.