Which interface IP and mask is a usable address for a /30 subnet between two routers?
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Correct answer: interface e0/0 description to XX-AXXX:XXXXX ip address 209.165.201.2 225.255.255.252.
Why this is the answer
The correct option is 209.165.201.2 255.255.255.252. A /30 subnet (255.255.255.252) provides four IP addresses: a network address, two usable host addresses, and a broadcast address. For the subnet 209.165.201.0 /30, the usable host addresses are 209.165.201.1 and 209.165.201.2. The address 209.165.201.2 is one of these usable addresses. The first option, 10.2.1.3 255.255.255.252, is incorrect because for the subnet 10.2.1.0 /30, the usable addresses are 10.2.1.1 and 10.2.1.2. 10.2.1.3 is the broadcast address. The second option, 192.168.1.1 255.255.255.248, is incorrect because 255.255.255.248 is a /29 subnet, not a /30. The third option, 172.16.1.4 255.255.255.248, is incorrect because 255.255.255.248 is a /29 subnet, not a /30. Also, for the subnet 172.16.1.0 /29, 172.16.1.4 is a usable address, but the question specifically asks for a /30 subnet.
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