What is necessary to configure VLAN tagging and IP addresses on a router?

To configure VLAN tagging and assign IP addresses on a router, subinterfaces are necessary. A subinterface is a virtual interface created on a physical interface of a router. This configuration allows a single physical network interface to handle traffic for multiple VLANs. Each subinterface can be associated with a different VLAN through the use of tagging (usually IEEE 802.1Q), allowing the router to differentiate between the VLANs and assign appropriate IP addresses to them.

In scenarios where multiple VLANs are present, routers utilize subinterfaces to route between those VLANs, enabling inter-VLAN communication. Each subinterface can be configured with its own IP address and other settings, making it effective for routing traffic specific to that VLAN.

Access ports, on the other hand, are used to connect end devices like computers and access points directly to a switch, typically passing traffic for a single VLAN. Trunk ports are designed to carry traffic for multiple VLANs on a switch to a router or another switch; however, trunk ports alone do not facilitate the configuration of IP addresses on a router. EtherChannels are used for bundling multiple physical interfaces to increase bandwidth and provide redundancy but do not specifically facilitate VLAN tagging or IP address configuration. Thus, while these other options play important roles