Router port, you can understand it as an ordinary network interface. For LAN, the routing port is equivalent to the gateway, and IP and mask must be configured.

VLAN is a virtual local area network. Physically, all ports on the switch are a collision domain, which you can understand as a local area network. However, VLAN isolates ports configured with the same VLAN into a virtual LAN and physically isolates them from other ports.

There are several types of IP addresses, 192. 168. X.X is a class C address,192.168.1-192.168.65438+.

Subdivision requires a mask. For example, the subnet just divided into 127 has a mask of 255.255.255.6438+028.

Subnet, IP address and subnet mask can be said to be one. The IP+ mask can identify the network segment or subnet.

As for the calculation of subnet and mask, it is not difficult to read a book.