Before you close a segmentation gap, understand why it exists

A connection the drawing does not explain

During a fictional site review, an engineer notices a connection between two network segments that the current drawing shows as separate. An operator remembers that someone added it during troubleshooting. The person who made the change is no longer on the project.

There is an obvious question about exposure. There is also an unanswered question about purpose. The diagram, the observation and the operator’s recollection do not yet tell the same story.

Separate what you know from what you suspect

In this example, the review team has evidence of a connection and an incomplete account of why it exists. It does not yet know whether a current task depends on it, whether another approved path replaced it, or whether the drawing is simply out of date.

Calling it “temporary” does not establish that it is unnecessary. Calling it “used by operations” does not establish that it should remain unchanged.

The useful next questions concern identity, purpose and ownership: which systems are involved, what activity might rely on the connection, and who can verify that account?

Preserve the reasoning

A learning memo for this scenario should record the observed discrepancy, the source of the operator’s recollection, the possible dependency and the evidence still needed. It should not silently convert a recollection into a confirmed requirement.

Any real change would need the relevant site’s authorization and change process. The learning exercise ends with a better-supported question, not permission to disconnect anything.

What this teaches

Finding a gap and understanding a gap are different tasks. A useful explanation makes both the concern and the uncertainty visible.

This is the kind of reasoning we want to explore through ALDBRN’s learning product. The first release starts with a narrower PLC/network-discovery exercise; segmentation remediation is not a launch feature.