See the table of contents below. This lesson introduces physical security and then moves to describe site barriers: walls, fences and top guards, hedges, berms, and ditches. It also introduces security zones. Table of Contents: 00:00 - Intro 00:28 - Physical Security Defined 01:18 - Administrative Controls 02:11 - Security Zones 02:53 - Locating Facilities 03:43 - Barriers 04:20 - Hedges, Berms, and Ditches 05:09 - Walls 06:04 - Fences 06:38 - Top Guard 07:12 - Gates 08:35 - Unwanted Perimeter Access 09:54 - Reinforced Barriers