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The Internet Reality

The Internet actually contains a complex internal physical structure that users never see.

Figure 13: Datagrams travelling between computers uses a physical path: either a network, or through a router to another network.
\scalebox{0.4}{\includegraphics{eps/cloudComputersReality.eps}}

A datagram travelling across the Internet must follow a physical path from one computer to another

Each network technology defines its own packet format and does not understand IP datagrams.


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``CMPT 165: Review'' by Tamara Smyth, Computing Science, Simon Fraser University.
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Copyright © 2011-12-05 by Tamara Smyth.
Please email errata, comments, and suggestions to Tamara Smyth<tamaras@cs.sfu.ca>
School of Computing Science,   Simon Fraser University