Network telemetry can include information such as network flows, packet metadata, connection records, DNS requests, IP addresses, ports, protocols, application activity, device status, and authentication events. Depending on the monitoring technology, telemetry may also include detailed packet or session-level information that provides greater context about network communications.
How Does Network Telemetry Work?
Network telemetry is generated as users, devices, applications, and services communicate across a network. Network infrastructure such as routers, switches, firewalls, gateways, endpoints, and cloud environments can generate telemetry data.
This information is collected through technologies such as NetFlow, IPFIX, sFlow, packet capture, network sensors, APIs, and security monitoring tools. The collected data is then sent to centralized platforms for storage, correlation, analysis, and visualization.
Modern network telemetry can operate continuously, allowing organizations to monitor network activity in near real time rather than relying solely on periodic logs or manual investigations.
Types of Network Telemetry
Network telemetry can take several forms, depending on the level of visibility required:
- Flow telemetry: Provides information about network conversations, including source and destination IP addresses, ports, protocols, timestamps, and traffic volume.
- Packet telemetry: Captures individual network packets or selected packet information for deeper analysis.
- DNS telemetry: Records of DNS queries and responses, helping identify suspicious domains and unusual name-resolution activity.
- Application telemetry: Provides visibility into application-level communications and behavior.
- Device telemetry: Reports information about network devices, interfaces, connectivity, resource utilization, and operational status.
- Security telemetry: Captures indicators associated with malicious activity, policy violations, unauthorized access, and potential attacks.
Why Is Network Telemetry Important?
Network telemetry provides organizations with visibility into network behavior that may not be available from endpoint or application logs alone. Security teams can use telemetry to establish baselines for normal activity and identify deviations that could indicate a security incident.
For example, unusual outbound connections, unexpected communication with external infrastructure, abnormal data transfers, or repeated connections to suspicious destinations can provide valuable indicators for threat detection and investigation.
Network telemetry also supports Security Information and Event Management (SIEM), Extended Detection and Response (XDR), Network Detection and Response (NDR), and other security platforms by supplying data that can be correlated with endpoint, identity, cloud, and application events.
Network Telemetry in Threat Detection
Security teams can analyze network telemetry to identify behaviors associated with malware, command-and-control communication, lateral movement, credential attacks, and data exfiltration. Historical telemetry can also help investigators reconstruct network activity and determine how an attacker moved through an environment.
The effectiveness of network telemetry depends on the quality, coverage, and context of the collected data. High-volume environments may generate significant amounts of telemetry, making efficient collection, storage, filtering, and analysis essential.
Network Telemetry vs. Network Monitoring
Network monitoring generally focuses on the availability, performance, and health of network infrastructure. Network telemetry provides underlying data that can support both operational monitoring and security analysis.
While traditional monitoring may focus on metrics such as bandwidth utilization, latency, packet loss, and device availability, network telemetry can provide broader visibility into communications, sessions, applications, and network behavior.
Conclusion
Network telemetry is an important source of visibility for modern network operations and cybersecurity. By continuously collecting data from network traffic, devices, applications, and connections, organizations can identify abnormal behavior, investigate incidents, improve network performance, and strengthen threat detection. When integrated with security analytics and response platforms, network telemetry can provide the context needed to detect and respond to threats more effectively.
- Monitoring Across Hybrid IT Infrastructure
- Asset Awareness in Distributed Hybrid Environments
- Unified Visibility Baseline Across Environments
