For years, network security worked like a castle: a strong wall around the outside, and relative freedom once you were inside. That model breaks down the moment an attacker, a compromised laptop or an unmanaged IoT device is already on the inside, which today they usually are.
What zero trust actually means
Zero trust removes the idea of an automatically trusted internal network. Every request to reach an application or resource is authenticated, authorised and encrypted, based on the identity of the user, the health of the device and the sensitivity of what they are reaching, regardless of where the request comes from.
The building blocks
- Strong identity and multi-factor authentication for every user
- Device posture checks before access is granted
- Micro-segmentation so a breach in one area cannot spread
- Least-privilege access, reviewed regularly
- Continuous monitoring and logging of every session
Why it matters for a building network
Modern buildings run CCTV, access control, BMS, parking and AV on the same physical infrastructure as business IT. Zero trust lets those systems share cabling and switching while staying logically isolated, so a vulnerable camera cannot become a path into finance systems.
Moving towards it
Zero trust is a journey, not a product. Most organisations start by tightening identity and segmenting their most sensitive systems, then extend the model outward. Designing the network and security together from day one makes every later step easier.
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