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Getting A Web Page

Notes:

The user types http://www.cmu.edu in the browser. The browser (an application, at OSI layer 7) asks the networking stack to initiate an HTTP connection with this address. But first the numerical IP has to be found, so a DNS request is sent to the DNS server. The local routing table of the kernel tells the network layer that the packets should be sent to the default gateway, since the address is obviously on another network (128.2.* versus 203.151.* which is the local network).