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can any one give me a brief what happens exactly when a packet is sent out from pc and croses Switch --> router --> firewall ???How does the decision occur and forward the packet.
Hi,
U can go through this link and you will get all the required information regarding Line cards.
http://www.cisco.com/c/en/us/support/docs/routers/12000-series-routers/47242-arch12000-lcdesign.html