Internet Protocol Version 4 (IPv4) Practice Test 2026 - Free IPv4 Practice Questions and Study Guide

In classful IPv4 addressing, the first bits of the address determine the network class. For Class C, the leading three bits are 110, so the first three bits of any Class C address are 110. This matches the fact that the first octet for Class C ranges from 192 to 223 in decimal, and 192 is 11000000 in binary while 223 is 11011111—both start with 110. The other sequences don’t fit Class C: 111 would indicate a different class (Class D/E depending on the fourth bit), and 100 or 101 start with 10, which belongs to Class B. Therefore, the correct binary representation is 110.