Internet is composition of many network such as private,
public, academic, business and government networks of local to global scope
that are linked by the electronic and optical networking technologies.
The Internet carries a vast array of information resources
and services. Many networking elements such as routers, switches, hubs etc. has
been interconnected together for communication of data over the transmission media.
The routers are connected with WAN interfaces through the serial ports for data
transmission and forwarding the packets using routing tables where as switches
and hubs are connected with LAN. Static routing tables and dynamic routing
protocols tell the routers where to forward IP traffic. These routers mainly
transfer the data traffic between networks without any filtration. The job of
traffic filtering is best performed by Access Control Lists. Access list
filters the traffic by restricting the packets are to be forwarded or to be
blocked at the router’s interfaces. Router examines each packet and forward or
discard the packet based on the information available in the access control
list. Restriction of the traffic can be source I.P. address, Destination I.P.
address and port numbers also. Finally, in the reports trainees has to give
different commands on the router on various routing techniques and access lists
to get the require results for connection establishment and troubleshooting of
WAN interfaces and LAN networks.
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