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Cisco Certified Network Associate (CCNA) · Cisco
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Write them power of 2s down before you take test for questions like this.
First, calculate the maximum number of hosts needed: * 8 floors × 40 users ≈ 320 users We need a subnet mask that supports at least 320 hosts. Host capacities: * A. 255.255.0.0 = /16 → 65,534 hosts ❌ too large, wastes address space * B. 255.255.254.0 = /23 → 510 hosts ✅ * C. 255.255.255.128 = /25 → 126 hosts ❌ not enough * D. 255.255.255.224 = /27 → 30 hosts ❌ not enough So the correct answer is: ✅ B. ip address 192.168.0.0 255.255.254.0 For a /23 subnet: 2^{9}-2=510 That gives 510 usable host addresses, which is enough for about 320 users while still being more efficient than a /16 subnet.
maximum total users = 40 * 8 = 320 users. Therefore, required host bits = 9 -> /23 subnet -> 255.255.254.0