Special Report

eCN Special Report: Next-Generation Network Security

Posted on September 28, 2010

A multilayered approach is often necessary to protect campus networks.

In the Middle Ages, city planners and feudal land owners relied on a multilayered approach to keep marauders at bay: Those laying siege to a castle, for instance, first had to cross a moat, then get past an outer wall, or curtain wall. If they succeeded in breaching this outer wall, invaders faced a series of daunting obstacles in a structure called a barbican, a narrow exterior passage that led to the main castle entrance. Invaders who were lucky enough to reach this barbican were subject to attacks with heavy stones, molten lead, or boiling water dropped through “murder holes” in the ceiling of the passage.

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