单项选择题 Which statement describes a spanning-tree network that has converged?（）

多项选择题 What are three valid reasons to assign ports on VLANs on a switch?（）

单项选择题 A college has a small campus where 25 faculty members are located. The faculty offices and student computers are currently on the same network. The faculty are concerned about students being able to capture packets going across the network and obtain sensitive material. What could a network administrator do to protect faculty network traffic from student connections?（）