What is Precision Time Protocol (PTP)?

What is Precision Time Protocol (PTP)?

• A. A protocol for very precise time synchronization, down to the nanosecond
• B. A protocol for securing SIP signaling
• C. A protocol for DNS resolution caching
• D. A protocol for packet compression

Answer: (A)

Precision Time Protocol is about synchronizing clocks across a network with extremely high accuracy, often down to nanoseconds. Devices exchange timestamped messages to measure how long signals take to travel and to adjust local clocks so they all stay in tight lockstep. Achieving this precision relies on features like a master clock distributing time, slave clocks following it, and hardware timestamping to reduce measurement errors. The standard is defined by IEEE 1588 and is used in environments where coordinated timing is crucial, such as telecom networks, financial trading systems, industrial automation, and power-grid control. The other options don’t fit because PTP isn’t about securing SIP signaling, DNS resolution caching, or packet compression.

Precision Time Protocol is about synchronizing clocks across a network with extremely high accuracy, often down to nanoseconds. Devices exchange timestamped messages to measure how long signals take to travel and to adjust local clocks so they all stay in tight lockstep. Achieving this precision relies on features like a master clock distributing time, slave clocks following it, and hardware timestamping to reduce measurement errors. The standard is defined by IEEE 1588 and is used in environments where coordinated timing is crucial, such as telecom networks, financial trading systems, industrial automation, and power-grid control. The other options don’t fit because PTP isn’t about securing SIP signaling, DNS resolution caching, or packet compression.