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

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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?（）

A.255.255.255.0
B.255.255.254.0
C.255.255.252.0
D.255.255.248.0
单项选择题
What is the first 24 bits in a MAC address called?（）

A. NIC
B. BIA
C. OUI
D. VAI
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