Serial interface, also called high-speed asynchronous Serial port, mainly refers to V 35 The cable is used for the connection between the router and the router. You can use the command to set the bandwidth, which is generally about 10M or 8M.

It is an Ethernet interface, called Ethernet interface, which is mainly used to connect Ethernet (LAN). It can also be connected with ordinary twisted pair. The default speed is 10Mbps. Now this interface has been eliminated on new devices. In addition, there is an indispensable interface on the router, the Console interface, which is used to debug the router. Some routers also have AUX interfaces, which are also control interfaces; There is also port G, which is a gigabit Ethernet interface for connecting Ethernet.

It is a FastEthernet interface, a fast Ethernet interface, also called a 100M port. It is mainly used to connect Ethernet (LAN). To put it bluntly, it is used to connect switches or computers. It can be connected with ordinary twisted pair cables. The default speed is 100Mbps. You can limit the speed with the command, but it cannot exceed 100Mbps.

Port G means Gigabit Ethernet. Gigabit only means that it is a gigabit port. The display of both optical and electrical ports is the same. If you want to see it in detail, you can view it in display int.

Gigabit Ethernet can be either an optical port or an electrical port, depending on the device parameters. Ethernet is an Ethernet port and Gigabit Ethernet is a gigabit Ethernet port. Both are defined by IEEE 802.3-2005 standard, and can use network cable or optical fiber.