单项选择题
A. A subnet mask specifies the portion of an IP address that is in a binary format
B. A subnet mask specifies the portion of an IP address that is in a decimal format
C. A subnet mask specifies the portion of an IP address that represents a network prefix
D. A subnet mask specifies the portion of an IP address that represetns network hosts
单项选择题 There are three static routes in the routing table that need to be announced to your OSPF preers. Which method is used to accomplish this?（）
单项选择题 Your network administrator has asked you to view the real-time interface usage on ge-0/0/0, Which command whould be used?（）
多项选择题 Which two statements are correct about Layer 2 broadcast frames?（）