Last updated: May 1, 2026
Traditional VPN gave users full network reach; the implicit assumption was that the corporate network is a “trust zone”. That assumption was wrong by 2010 and indefensible by 2020. ZTNA inverts the model: identity-aware proxy in front of every application, explicit authorisation per-request, no broad network access ever granted. This module is the working introduction to ZTNA, comparison with VPN, and the migration path — relevant in 2026 to almost every Indian enterprise rolling out hybrid work.
The two trust models — and why VPN's broke
VPN modelauthenticate once, get network access, applications enforce their own auth. The implicit trust: “if you are on the corporate network, you are an employee with reasonable intentions”. Worked acceptably when “the network” was a single office building with controlled physical access. Broke when remote work, contractors, BYOD, and supply-chain compromise meant any device on the VPN might be a hostile beachhead. Lateral movement became trivial — once on the VPN, you could ping every internal host.
ZTNA modelno network-level access at all; instead, an identity-aware proxy fronts each application; every request is authorised based on user identity + device posture + request context; only authorised connections pass through.
Resulta compromised endpoint sees only the apps that user is allowed to use, and only when the device passes posture checks. Lateral movement is meaningfully harder.
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