ZIA
acronymcloudsecurity
Zscaler Internet Access: the Exchange's outbound seat - secure web gateway, cloud firewall, and data protection applied between users and the internet/SaaS.
The traffic must be forwarded to it first - agent, tunnel, PAC, or proxy chain.
ZIA is the outbound half of the Zscaler platform: a cloud proxy that user traffic is forwarded to before it reaches the internet. Traffic from a managed device tunnels to the nearest service edge, is decrypted there, passed through URL filtering, threat inspection, sandboxing and data loss prevention, then re-encrypted and sent on to the destination.
The architectural consequence is that inspection happens on someone else's hardware in a location you did not pick, which is the whole trade. You gain policy that follows the user rather than the office, and consistent enforcement whether the laptop is on the corporate network or in an airport. You accept an extra hop that every packet pays for, and a dependency on the nearest edge being reachable and healthy.
Most operational difficulty concentrates in what you choose not to inspect. Certificate-pinned applications, financial and healthcare destinations subject to privacy rules, and anything that breaks under interception all need explicit bypasses, and each bypass is a hole in the coverage you are paying for. Getting that list right is the real work of running ZIA, and it is a policy conversation more than a technical one.