Free Programming Tutorials

The values found in an IP packet’s headers provide all of the information necessary to successfully send data from one computer running TCP/IP to another computer running TCP/IP; it doesn’t matter if the two computers are cabled onto the same LAN or if they are physically separated by large geographic distances, the data will still arrive intact. Unfortunately, this robustness is a double-edged sword. If someone is so inclined, they can exploit the values found in an IP packet’s heade 
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