CISCO CCNA 200-301 Q50

An engineer must configure a /30 subnet between two routers. Which usable IP address and subnet mask combination meets this criteria?

A.
interface e/0
description to HQ-A371:10975
ip address 172.16.1.4 255.255.255.248

B.
interface e/0
description to HQ-A371:10975
ip address 10.2.1.3 255.255.255.252

C.
interface e/0
description to HQ-A371:10975
ip address 192.168.1.1 255.255.255.248

D.
interface e/0
description to HQ-A371:10975
ip address 209.165.201.2 255.255.255.252

Correct Answers: D

Explanation:
/30 subnet means subnet mask of 255.255.255.252. But 10.2.1.3 255.255.255.252 is a broadcast IP address; only 209.165.201.2/30 is the usable IP address.