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BackWhat is Network Detection and Response (NDR)?
Network Detection and Response (NDR) is a cybersecurity technology that continuously monitors network activity to identify, investigate, and respond to suspicious behavior. It analyzes communications between devices and systems to uncover threats that traditional preventive controls may miss.
Instead of focusing primarily on individual endpoints, NDR observes traffic moving across an organization’s network. This visibility can help security teams identify lateral movement, command-and-control (C2) communication, unusual connections, data exfiltration, and activity involving devices that cannot run endpoint security agents.
NDR provides an important detection layer for organizations that need visibility into how systems communicate across their environments.
How does NDR work?
NDR collects and analyzes network telemetry to identify behavior that may indicate an attack.
| Stage | What happens |
|---|---|
| Traffic collection | The platform collects network packets, flows, metadata, or related telemetry |
| Behavioral analysis | Detection engines analyze communication patterns and establish expected activity |
| Threat detection | The system identifies anomalies, known indicators, or suspicious network behavior |
| Investigation | Analysts examine connections and related events to understand the threat |
| Response | Security teams contain affected systems or integrate with other tools to take action |
Modern NDR platforms may combine behavioral analytics, machine learning, threat intelligence, and signature-based techniques to identify suspicious communications.
What threats can NDR detect?
Network monitoring can expose attacker behavior that becomes visible when compromised systems communicate.
Common examples include:
- Lateral movement between systems.
- Command-and-control communications.
- Connections to known malicious infrastructure.
- Unusual outbound data transfers.
- Network reconnaissance and scanning.
- Unexpected communication between devices.
- Suspicious activity from unmanaged or IoT devices.
NDR can prove particularly valuable when attackers use legitimate credentials or tools that make endpoint activity harder to classify as malicious.
NDR vs EDR
The two technologies provide complementary visibility.
| NDR | EDR |
|---|---|
| Monitors network communications | Monitors endpoint activity |
| Analyzes traffic and connection behavior | Analyzes processes, files, users, and endpoint events |
| Can observe unmanaged devices through their traffic | Typically requires endpoint software or sensors |
| Provides network-level investigation context | Provides detailed device-level investigation context |
| Helps identify lateral movement and suspicious communications | Helps identify malware and malicious endpoint behavior |
Organizations can combine both approaches to investigate an attack from the network and endpoint perspectives.
Where Hexnode adds endpoint context
Network detections become more actionable when analysts can investigate what happened on the device involved. Hexnode XDR provides this endpoint context for supported Windows devices by collecting telemetry about processes, files, users, and network connections.
Security teams can use process trees and MITRE ATT&CK mappings to trace suspicious endpoint behavior and then contain confirmed threats by isolating endpoints, killing malicious processes, or quarantining files. This endpoint-level visibility can complement network-focused detection when an investigation moves from suspicious traffic to the affected device.
FAQs
NDR solutions can analyze metadata, traffic patterns, destinations, timing, and other characteristics even when encryption prevents direct inspection of payload contents. Exact capabilities vary by platform.
Generally, no. NDR typically monitors network traffic through sensors, traffic mirroring, flow records, or similar mechanisms rather than installing an agent on every endpoint.
No. Firewalls primarily enforce network access rules, while NDR focuses on detecting and investigating suspicious activity within network communications. Organizations often use both as complementary security controls.
