1, serial port: it is an extended interface using serial communication.

2. Ethernet port: it is the port for network data connection.

Second, the application is different.

1, serial port: used for next-hop routing conversion. Each VLAN can only be connected to the external network after it points to the route through the trunk.

2. Ethernet port: it is the most widely used LAN communication mode and a protocol. Ethernet protocol defines a series of software and hardware standards to connect different computer devices together.

Third, the composition is different.

1, serial port: According to electrical standards and protocols, including RS-232-C, RS-422, RS485, etc. RS-232-C, RS-422 and RS-485 standards only specify the electrical characteristics of interfaces, and do not involve connectors, cables or protocols.

2. Ethernet port: The basic elements of the network include switches, routers, hubs, optical fibers and ordinary network cables, as well as Ethernet protocols and communication rules. The port of network data connection in Ethernet is Ethernet interface.

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