XDR
Also known as: Extended Detection and Response
XDR (Extended Detection and Response) combines security data from endpoints, network, email, and cloud to detect attacks spanning multiple sources.
XDR (Extended Detection and Response) builds on the same principle as EDR but extends the observation beyond a single endpoint to network traffic, email, cloud services, and identity systems. The reasoning is that many attacks aren't visible on a single device alone; they only reveal themselves as an attack once signals from several systems are seen together.
In practice, XDR pulls in alerts from different sources – endpoint protection, the firewall, the email filter, cloud services – and correlates them into a single picture. A single suspicious login barely stands out on its own; that same login combined with an unusual file transfer shortly afterward forms a clear attack pattern.
A common misunderstanding is treating XDR as simply 'more EDR' or a marketing label for the same product. The actual difference lies in correlating multiple data sources into one picture – a business that only monitors endpoints is still running EDR, no matter what it's called.
What it means in practice
For an SMB, XDR is worth considering once several systems are already in use whose interaction needs to be understood in an incident, such as cloud mailboxes, endpoints, and a central network. A sign that endpoint visibility alone isn't enough is an incident where nobody can later say through which path the attack actually started. NDVDL assesses case by case whether EDR is sufficient or a broader view is warranted.
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