Inline versus out-of-band AI enforcement: why the position matters

The request passes through the control on its way out. A security cloud, a proxy, an AI gateway or a firewall can all be inline if traffic is routed through them. Because the control holds the request, it can block it, rewrite it, or let it through, and the decision happens before anything leaves. The cost is that the control must be fast and reliable, since every request waits for it.

The control looks at a copy of the traffic, at logs, or at the AI service's own API after the event. It is easier to deploy, because nothing is in the path, and it cannot slow anything down. It also cannot stop the first leak: by the time it sees a prompt with customer data, the prompt has already been sent.

All six vendors in this finder state some form of real-time or inline blocking on the pages we read. The difference is in what else they state around it: which responses besides blocking, which traffic types, and where the inline point sits. Cato states it checks every interaction inline, with fast checks in milliseconds and deeper models for edge cases. No vendor publishes a latency figure we could compare.

Source: Cato Networks: AI security · Read 7 Oct 2026

When you are still learning what is in use, when the data at stake is low, or when a block would break a workflow you cannot yet replace. Many teams start out-of-band or in a watch-only mode and move the riskiest flows inline once they know what normal looks like.

Four things. First, what happens when the control is unavailable: some teams choose to let traffic through uninspected, others choose to stop it, and the choice should be written down. Second, which traffic actually passes the inline point: remote users, server workloads and agents may take other routes. Third, how the person is told about a block or a change, because a silent failure looks like a broken tool and generates support tickets. Fourth, how decisions are logged, since an inline control that blocks without a record leaves nobody able to explain what happened. Test each of these in a pilot before the control is switched on for everyone.