单项选择题 Which of the following devices separates a LAN segment into two collision domains, without affecting the broadcast domain?（）

单项选择题 Which of the following protocols is used to encrypt data between web servers and web browsers?（）

单项选择题 A user plugged a cable between two network jacks that attach to the same switch and caused a broadcast storm. Which of the following would have prevented the broadcast storm?（）