What is Network Security Monitoring (NSM)?

Network Security Monitoring (NSM) is the continuous process of collecting, analyzing, and investigating network activity to detect cyber threats and security incidents. Organizations use Network Security Monitoring (NSM) to identify suspicious behavior, investigate attacks, and improve visibility across their networks. Rather than relying solely on preventive controls, NSM helps security teams identify threats that have bypassed existing defenses.

Why do organizations use NSM?

Modern networks generate large volumes of traffic across users, devices, applications, and cloud services. Security teams need continuous visibility to detect malicious activity before it causes significant damage.

Organizations use NSM to:

• Detect network-based threats
• Investigate suspicious activity
• Improve network visibility
• Support incident response
• Reduce attacker dwell time

These capabilities help organizations respond more quickly to evolving cyber threats.

How does Network Security Monitoring work?

NSM combines network telemetry, traffic analysis, and security investigations to identify suspicious behavior. Analysts review network data and investigate anomalies that may indicate malicious activity.

A typical workflow includes:

• Collecting network telemetry
• Monitoring network traffic
• Detecting suspicious activity
• Investigating security alerts
• Correlating security evidence
• Supporting incident response

This approach helps security teams understand what is happening across the network in real time.

What information does NSM analyze?

NSM relies on multiple sources of network data to provide visibility into security events.

Combining these data sources helps analysts build a more complete picture of network activity.

What challenges affect NSM?

As networks become larger and more distributed, monitoring every connection becomes increasingly complex. Common challenges include:

• High network traffic volumes
• Encrypted communications
• Alert fatigue
• Cloud visibility gaps
• Correlating data from multiple sources

Organizations often address these challenges by integrating multiple security tools and prioritizing high-risk events.

Extending network investigations to endpoints

Network monitoring identifies suspicious communications, but endpoint evidence often explains what happened before and after a network event. Combining these perspectives gives security teams a more complete understanding of an incident.

Hexnode XDR can support investigation workflows through:

• Visibility into endpoint activity
• Centralized review of security incidents
• Investigation of suspicious events
• Endpoint scans during incident response
• Context gathering from affected devices
• Remote terminal access when appropriate

These capabilities help analysts connect network observations with endpoint activity during security investigations.