Internet is a network of networks that contains many private, public, academic, business and government networks of local to global scope. They are connected by a broad array of electronic and optical networking technologies. The Internet transports a vast array of information resources and services. Various Network elements such as routers, switches, hubs etc are interconnected together for the communication of data using the transmission media. By using the routing tables, the switches and hubs are connected to the WAN to transfer the packets. For transmission of data, the routers are connected to the WAN interfaces via serial ports.
Static routing tables and dynamic routing protocols will inform the routers where to forward IP traffic. These routers mainly route the data traffic between networks without any filtration. Access Control Lists will perform the filtering of data traffic. Access control list filters the traffic by restricting the packets that are to be blocked or to be forwarded at the router’s interfaces. Router will check each packet. Based on the information available in the access control list, it will forward or discard the packet. Restriction of the traffic can be port numbers, source I.P. address and Destination I.P. address etc.
In the reports, the trainee should give the various commands to the access lists and router on various routing techniques to get the required results for connection establishment and troubleshooting of LAN networks and WAN interfaces.