单项选择题
What is the first 24 bits in a MAC address called?（）
A. NIC B. BIA C. OUI D. VAI
单项选择题 When is it necessary to use a public IP address on a routing interface?（）
单项选择题 What will happen if a private IP address is assigned to a public interface connected to an ISP?（）
单项选择题 Which IP address can be assigned to an Internet interface?（）
