Internet is a network of networks that consists of millions of private, public, academic,
business,and government networks of local to global scope that are linked by a broad array of electronic and
optical networking technologies. The Internet carries a vast array of information resources and services.
Different Network elements such as routers, switches, hubs etc.. has been interconnected together for
commincation of data over the transmission media. The routers are connecting the WAN interefaces through
the serial ports for data transmission and forwarding the packets using routing tables where as switches and
hubs are connecting the LAN.
Static routing tables and dynamic routing protocols tell the routers where to forward IP traffic .These
routers mainly route the data traffic between networks without any filterattion. 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 examine each packet and forward or discard the
packet based on the information available in the access control list. Restriction of the traffic can be either
source I.P. address, Destination I.P. address, port numbers also
Finally, in the reports trinees has to give different commands on the router on various routing
techniques and accesslists to get the require results for connection establishment and troubleshooting of WAN
interefaces and LAN networks.
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