Communication with Router using the following methods

1. Console
2. Auxiliary
3. Telnet
4. SSH
5. HTTP
6. HTTPS

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Routers are special computers built to handle inter-network traffic. . The end users have not communicate with the routers, but the network traffic generated by the end users communicate through the router.Basically routers is using to connecting to or more different networks at the same time
A network administrator can choose any of the following methods to communicate with the router.

Connection by Console Port

 The console port is the management port which is used by administrators to log into a router directly-that without using a network connection. You require a terminal emulator application like hyperterminal or PuTTY or TERA TEAM to connect to router. Console port connection is a way to connect to the router when a router cannot be accessed over the network.

Connection by Auxiliary Port (AUX Port)

AUX port is using a remote computer through a modem that calls another modem connected to the router with a cable using the Auxiliary Port on the router. Auxiliary Port (AUX Port) allows a direct, non-network connection to the router, from a remote location. The Auxiliary Port (AUX Port) is providing help to  uses a connector type to which modems can plug into, which allows an administrator from a remote location to access the router like a console port.

Connection by protocols like telnet, SSH, HTTP or HTTPS

The routers can be managed over the network by using standard TCP/IP protocols like Telnet, SSH, HTTP or HTTPS. Telnet was developed in the early days of the UNIX operating system to manage computers remotely. A Telnet client and server application ships with Cisco's IOS software and most computer operating systems. SSH is a more secure way to configure routers, since the SSH communication is encrypted and the packet did not snaffing . Cisco IOS also has a HTTP server to managed web based communication with the router.