... 10.100. 12. 0 /25 and 10.100. 12. 128 /25 = 10.100. 12. 0 /24 10 .20 .0.0/16 and 10 .21 .0.0/16 = 10 .20 .0.0/15 1 72. 16 .24 .0 /27 through 1 72. 16 .24 .96 /27 = 1 72. 16 .24 .0 /25 1 92. 168. 32. 0 /24 through 1 92. 168.63.0 /24 ... 1 72. 16.1.9/30, 1 72. 16.1.14/30 • Set B: 10.100.40.14 /24 , 10.100.34.56 /24 , 10.100.59.81 /24 • Set C: 1 72. 18.10.10 /23 , 1 72. 31.40.8 /24 , 1 72. 24.8.1 /22 , 1 72. 30 .20 0.1 /24 • Set D: 1 92. 168.8.10 /27 , ... IPv4 addresses defined by the IETF are • 10.0.0.0 through 10 .25 5 .25 5 .25 5— a single Class A network • 1 72. 16.0.0 through 1 72. 31 .25 5 .25 5— 16 Class B networks • 1 92. 168.0.0 through 1 92. 168 .25 5 .25 5—...