多项选择题 A network administrator issues the ping 192.168.2.5 command and successfully tests connectivity to a host that has been newly connected to the network. Which protocols were used during the test? （）

多项选择题 What are two results of entering the Switch(config)# vtp mode client command on a Catalyst switch?（）

单项选择题 A technician is troubleshooting a host connectivity problem. The host is unable to ping a server connected to Switch_A. Based on the results of the testing, what could be the problem（）。