Why? IP 네트워크 상 문제를 파악하고 수리할 수 있음 Cisco TroubleShooting 방법 1. Open a Command window and ping 127.0.0.1 - If you get a successful ping, your IP stack is considered to be initialized. If it fails, then you have an IP stack failure and need to reinstall TCP/IP on the host 2. From the Command window, ping the IP address of the local host - If that's a successful, your network interface card(NIC) is f..