Question:
What subnet mask is needed if an IPv4 network has 40 devices that need IP addresses and address space is not to be wasted?
- 255.255.255.240
- 255.255.255.128
- 255.255.255.224
- 255.255.255.192
- 255.255.255.0
Explanation: In order to accommodate 40 devices, 6 host bits are needed. With 6 bits, 64 addresses are possible, but one address is for the subnet number and one address is for a broadcast. This leaves 62 addresses that can be assigned to network devices. The mask associated with leaving 6 host bits for addressing is 255.255.255.192.
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