单项选择题
A network interface port has collision detection and carrier sensing enabled on a shared twisted pair network. From this statement, what is known about the network interface port（）。
A.This is a 10 Mb/s switch port B.This is a 100 Mb/s switch port C.This is an Ethernet port operating at half duplex D.This is an Ethernet port operating at full duplex E. This is a port on a network interface card in a PC
单项选择题 Refer to the exhibit. The user at Workstation B reports that Server A cannot be reacheD.What ispreventing Workstation B from reaching Server A?（）
多项选择题 下面对我国广泛使用的DDN网络描述正确的是什么？（）
多项选择题 下列所描述的协议哪些属于OSI参考模型表示层协议（）。
