Question 1

What is the difference between MDR and SIEM?

Accepted Answer

A SIEM is a platform that collects and correlates log data to support detection, while MDR is a managed service that delivers detection and response outcomes using skilled analysts. MDR often uses a SIEM as one of its tools, but adds the people and processes a SIEM alone does not provide.

Question 2

Do I still need a SIEM if I have MDR?

Accepted Answer

Not necessarily as a separate purchase. Many MDR services include the underlying SIEM or analytics platform. If you already own a SIEM, MDR can be delivered on top of it under a co-managed model so you continue to benefit from your existing investment.

Question 3

Why isn't a SIEM enough on its own?

Accepted Answer

A SIEM produces alerts, but it cannot investigate, prioritise or respond by itself. Without skilled analysts to tune rules and act on findings, organisations often face alert fatigue and miss real threats. MDR provides the human expertise that turns SIEM data into action.

Question 4

Is MDR more cost-effective than running a SIEM in-house?

Accepted Answer

For many organisations, yes. Operating a SIEM effectively requires licensing plus a skilled team for engineering, tuning and 24/7 monitoring. MDR bundles the platform and expertise into a predictable subscription, removing much of the staffing burden.

Question 5

Can you operate our existing SIEM?

Accepted Answer

Yes. Under a co-managed model our SOC takes on detection engineering, tuning and round-the-clock monitoring of your current SIEM, so your existing investment delivers measurable detection and response outcomes.

MDR vs SIEM: Which Do You Actually Need?