You are networking professional who works in a college computer lab. The computers run only TCP/IP protocol on an Ethernet network, and all the computers use 3Com NICs. Many beginning computer science students use this lab for homework; you help them access the network and troubleshoot problems with their connections on a daily basis. One day, a student begins tampering with his computer; when he restarts his computer, it alerts him that it can't find the network. Then, you check the workstation's network properties and find that he has changed the frame type that his NIC uses to transmit data from Ethernet to token ring. Explain why this has prevented the workstation from connecting to the network.