Cisco Certified Network Associate (CCNA) Practice Exam 2026 – The Comprehensive All-in-One Guide to Exam Success!

To determine which IP addresses can be assigned to network hosts with a subnet mask of 255.255.255.224, it is essential to understand the implications of the subnet mask.

A subnet mask of 255.255.255.224 indicates that the first 27 bits are used for the network portion, leaving 5 bits for the host portion. This means there are 2^5, or 32, possible addresses in this subnet. However, two addresses are reserved: one for the network address (the first address) and one for the broadcast address (the last address). Consequently, the usable addresses for hosts in a /27 subnet are 30.

For a given IP address to be part of a subnet defined by the 255.255.255.224 mask, it must fall within a specific range defined by a base address. Each subnet has a block size of 32 (derived from the 5 bits available for hosts), meaning subnets are defined at every multiple of 32.

To analyze the options:

- For the first address, 15.234.118.63, it belongs to the subnet calculated using the last octet. However, determining the range entails calculating that the subnet would actually begin