Find a new subnet ID must be part of Class A network 10.0.0.0, that the new subnet must not overlap with the original five subnets, and that the new subnet ID must be the numerically lowest possible subnet ID (without breaking the other rules). Pick the one subnet ID that you would plan to use based on each of the following mask choices by the boss: /24, /23, /22, /25.

The already used ranges are:

10.0.0.0 /24 (Broadcast: 10.0.0.255, Host.Min: 10.0.0.1, Host.Max: 10.0.0.254) 10.0.1.0 /25 (Broadcast: 10.0.1.127, Host.Min: 10.0.1.1, Host.Max: 10.0.0.126) 10.0.2.0 /26 (Broadcast: 10.0.2.63, Host.Min: 10.0.2.1, Host.Max: 10.0.2.62) 10.0.3.0 /27 (Broadcast: 10.0.3.31, Host.Min: 10.0.3.1, Host.Max: 10.0.3.30) 10.0.6.0 /28 (Broadcast: 10.0.6.15, Host.Min: 10.0.6.1, Host.Max: 10.0.6.14)