This drag-and-drop item is a subnetting exercise. For each IPv4 network, first identify the block size from the subnet mask, then calculate the network address, first usable host, last usable host, and broadcast address. Cisco CCNA 200-301 v1.1 expects candidates to work these ranges without relying on a calculator because routing, VLAN addressing, DHCP pools, and ACL wildcard logic all depend on the same arithmetic. A usable host range never includes the subnet ID or the broadcast address. For example, a /29 has eight total addresses and six usable hosts, while a /30 has four total addresses and two usable hosts. The correct matching is the one where each subnet is paired with only the valid host addresses inside that exact block. If an address falls on the boundary of the subnet or at the final broadcast value, it is not assignable to an interface. The reliable method is binary block sizing, not visual similarity between numbers.