The Linksys WRT400N is a dual-band wireless router that supports both 2.4 GHz and 5 GHz frequencies. It features four Ethernet ports and a USB port for connecting external devices. The router supports WPA, WPA2, and WEP wireless security protocols, as well as VPN pass-through for secure remote access. The WRT400N also includes a built-in Stateful Packet Inspection (SPI) firewall and Network Address Translation (NAT) to protect against unauthorized access. The router is compatible with both Windows and Mac operating systems.

The WRT400N is a router manufactured by the company Linksys that allows multiple devices to connect to a network and communicate with each other. It works by receiving data packets from devices and forwarding them to their intended destination. The router is assigned a unique IP address , which serves as its identifier on the network.

To access the router's settings and configure its functions, users can log in using a web browser and their and . Once logged in, users can customize various settings such as network name, password, and security protocols. They can also set up parental controls, prioritize bandwidth usage, and monitor network activity.