Episode 1, layer 1: Perimeter
The perimeter
Before you get anywhere near a server, you meet a fence. This episode covers what each part of a perimeter does, and who builds and runs it.
Narration is synthetic, generated from the creator's own voice.
Layer 1 of 8: Perimeter
In this episode
How a perimeter works in layers: deter, detect, delay, mitigate and respond. Why equipment gives information but people make the decisions. The difference between a barrier that controls traffic and one built to stop a vehicle. And how access control asks two questions: who are you, and are you allowed in?
Three things to take away
- A perimeter works in layers: deter, detect, delay, mitigate, respond.
- Equipment gives information. People make the decisions.
- You can't judge a barrier by how it looks.
Who works here
- Security officers, reception and control room operatorsThey are the first people every visitor meets, and the ones watching day and night. They check identities, issue passes, monitor cameras and alarms, and respond when something isn't right.
- Security techniciansThey install, test and maintain cameras, alarms and access control across the site.
- ElectriciansThey install and maintain the electrical supplies and lighting that every camera, reader and gate motor depends on, and much more as the series moves inside.
- Fencing crewsThey build the perimeter itself: foundations, posts, panels and gates.
The Careers Guide shows how people get into each job.
Documents
- Campus site planRevision A
- Security layers, fence to front doorRevision A
- Gatehouse and gates layoutRevision A
Drawings for this layer are published in the Library as they are ready.
Sources
Each source is listed with the claim it supports.
A perimeter works in layers: deter, detect, delay, mitigate and respond.
Protecting your assets: protective security principles, NPSA (UK National Protective Security Authority)
Barriers built to stop a vehicle are impact-tested, and you can't tell which is which just by looking.
ISO 22343-1, Vehicle security barriers: performance requirement, vehicle impact test method and performance rating, ISO, Edition 1, 2023