单项选择题
In the MAC address 00: : :9f:eA. , what represents the Organizationally Unique Identifier (OUI)?（）
A. :9f:eA B. 00: : :9f C. 9f:eA D. 00: :
多项选择题 Which two fields are found in an Ethernet frame header?（）
多项选择题 Which two statements are correct about Layer 2 broadcast frames?（）
多项选择题 Which two statements accurately describe a broadcast domain?（）
