Internet connectivity troubleshooting takes Cisco router as an example to explain the role of routers in the Internet. Through the Show command, the status of the router\'s WAN interface and Ethernet interface and the interface statistics are checked, and the various states and information of the router interface are analyzed. The common router diagnostic commands are used to determine and locate the network fault point, so as to eliminate the connectivity faults between the LAN and the WAN, and between LANs. The use of common router diagnostic commands such as Ping and trace for Internet connectivity faults, and the common TCP/IP connection fault diagnosis and troubleshooting methods are introduced.
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