Updated November 2026
The short version
- MDR is a service, not just a tool: people monitor, investigate and respond using security technology.
- It typically includes 24/7 monitoring, threat hunting and help containing attacks.
- It suits businesses that need round-the-clock coverage without building that capability in-house.
What MDR means
Microsoft describes MDR as a cybersecurity service that combines technology and human expertise to hunt for, monitor and respond to threats. Cisco describes it as 24/7 monitoring of security data to speed up how quickly threats are found and handled.
The key word is managed. Security tools create a steady stream of alerts. An MDR provider sorts real threats from false alarms, looks into what happened and takes action, so the business is not left to work through every alert alone.
What MDR usually includes
Offerings vary by provider. Microsoft lists these as typical:
- Threat monitoring and response around the clock
- Threat hunting led by human experts
- Containment to stop an attack from spreading
- Response to remove threats
- Root cause analysis to help prevent a repeat
- Regular reports and health checks
Because offerings vary, check exactly which of these a provider includes and which cost extra.
How MDR works
Microsoft breaks the MDR process into five steps:
- Prioritize: automation and analysts sort the flood of alerts and separate false alarms from real threats.
- Hunt: experts look for hidden threats that automated tools can miss.
- Investigate: analysts work out what kind of attack it was, when it happened, who was affected and how serious it is.
- Remediate: the attack is disrupted, for example by removing malware or isolating affected systems.
- Neutralize: a root cause analysis helps remove the attacker fully and prevent the same kind of attack again.
MDR compared with EDR and other terms
Endpoint detection and response (EDR) is technology that watches laptops, desktops and servers for threats and helps contain them. MDR is a human-led service that can use EDR along with other tools and data. Cisco notes that MDR covers networks, endpoints and clouds, while EDR focuses on endpoint devices.
- EDR
- What it is: Technology
- What it covers: Endpoint devices
- MDR
- What it is: A managed service run by experts
- What it covers: Networks, endpoints and cloud, depending on the provider
- MEDR
- What it is: Managed EDR
- What it covers: Endpoints
- MNDR
- What it is: Managed network detection and response
- What it covers: Network infrastructure
- MXDR
- What it is: Managed extended detection and response
- What it covers: Endpoints, networks, cloud and connected devices
Who needs MDR?
MDR is a good fit if
- Threats need watching at night and on weekends
- Alerts go unread because no one has time for them
- You want experts to act on threats, not just report them
You may need other steps first if
- You do not yet have basic protections on devices and email
- You do not know which systems you have
- Staff sign in with passwords alone
MDR is one layer among several. Email security, MFA, staff training and backups each cover a different part of the problem.
Read the guide: What is MFA?Vulnerability assessment vs penetration testing
Questions to ask an MDR provider
- Is monitoring truly 24/7, including nights, weekends and holidays?
- What do you watch: endpoints, network, cloud or all three?
- When you find a threat, do you act to contain it, or only send an alert?
- How do you work with the tools and people we already have?
- What reports will we get, and how often?
- Who do we call, and how quickly will someone answer?
How 5x5 Telecom can help
5x5 Telecom's managed security services include 24/7 threat detection and response, along with endpoint monitoring, ransomware protection and backup and recovery. They protect your business where your network meets the outside world. The services in your plan are set in your service agreement.
Our 24/7 US-based team answers every ticket within 60 minutes. Start with a free security consultation: a look at how your network, devices and staff are protected today, a few questions and general recommendations. Detailed testing and hands-on work are scoped in the plan we propose.