Network telemetry is the collection, measurement, and analysis of data related to the behavior and performance of a network1. It involves gathering information about routers, switches, servers, and applications to gain insights into how they function and how data moves through them. To correlate different sources of network telemetry data, it is important to enable Network Time Protocol (NTP) across all network infrastructure devices. NTP is a protocol that synchronizes the clocks of network devices to a common reference time source2. This ensures that the network telemetry data has consistent timestamps and can be compared and correlated accurately. NTP also helps with troubleshooting network issues, as it allows network administrators to pinpoint the exact time of events and anomalies. NTP is a core security technology that is covered in the Implementing and Operating Cisco Security Core Technologies (SCOR) course3, which helps you prepare for the Cisco CCNP Security and CCIE Security certifications and for senior-level security roles. References: 1: Network Telemetry Explained: Frameworks, Applications & Standards - Splunk 2: [Network Time Protocol (NTP) - Cisco] 3: Implementing and Operating Cisco Security Core Technologies (SCOR) v1.0