What single Cisco IOS command could be used to enable EIGRP on two interfaces on a device, the first with an IP address of 172.16.1.1/25 and the second with an IP address of 172.16.100.1/27?
A) network 172.16.1.0 0.0.0.255
B) network 172.16.0.0
C) network 172.16.0.0 0.0.255.255
D) network 172.16.100.0 0.0.0.255
B, C
Explanation: B) When the network command is configured with EIGRP, no wildcard mask is required, but it can be added to limit the range of addresses being included. By default, classful boundaries are used, so the network 172.16.0.0 command will include both interfaces on this device, as will the network 172.16.0.0 0.0.255.255 command, which covers the same range of networks. The other options are valid but don't include both interfaces in a single command.
C) When the network command is configured with EIGRP, no wildcard mask is required, but it can be added to limit the range of addresses being included. By default, classful boundaries are used, so the network 172.16.0.0 command will include both interfaces on this device, as will the network 172.16.0.0 0.0.255.255 command, which covers the same range of networks. The other options are valid but don't include both interfaces in a single command.
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