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Merged
llpeterson merged 1 commit into from
Sep 4, 2026
Merged

add hourglass figure #37

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8 changes: 7 additions & 1 deletion intro.rst
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Expand Up @@ -116,7 +116,13 @@ capability. The best-effort packet delivery model included a "default
open" setting: if you knew the destination address of a host, you
could send it a packet.

.. could include something about decentralization
.. _fig-hourglass:
.. figure:: figures/hourglass.png
:width: 220px
:align: center

The Internet architecture depicted as an hourglass. The narrow waist is the
Internet Protocol (IP), which includes no built-in security features.

The Morris Worm served as something of a wake-up call to the early
developers of the Internet by highlighting just how vulnerable it
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