What protocol or service is required for IP SLA to measure UDP jitter?

NTP (Network Time Protocol) is essential for IP SLA to accurately measure UDP jitter. Jitter is the variation in delay for packets, and precise time synchronization between the source and destination devices is critical for these measurements. Without synchronized clocks, the timestamps used to calculate delay variations would be inaccurate, leading to incorrect jitter readings. LLDP (Link Layer Discovery Protocol) and CDP (Cisco Discovery Protocol) are used for neighbor discovery and information exchange, not time synchronization. EEM (Embedded Event Manager) is for on-device event detection and automation, not a timing protocol.