单项选择题
Refer to the exhibit. What is the most appropriate summarization for these routes?（）
A.10.0.0.0/21 B.10.0.0.0/22 C.10.0.0.0/23 D.10.0.0.0/24
单项选择题 Refer to the exhibit. Which subnet mask will place all hosts on Network B in the same subnet with the least amount of wasted addresses?（）
单项选择题 What is the first 24 bits in a MAC address called?（）
单项选择题 What is known as "one-to-nearest" addressing in IPv6?（）
