CCNA DC FAQ: Anayzing Subnet Masks Figure: Simple Subnet Design, with Mask /24 Q1. Which of the following answers lists the prefix (CIDR) format equivalent of 255.255.254.0? a. /19 b. /20 c. /23 d. /24 e. /25 Answer: C. Thinking about the conversion one octet at a time, the first two octets each convert to 8 binary 1s. 254 converts to 8-bit binary 11111110, and decimal … [Read more...]