Data center network architecture is vulnerable to GNSS-related attacks such as jamming and spoofing. That’s why enhanced primary reference time clocks (ePRTCs) that utilize a stable frequency standard (such as a cesium clock) are increasingly being leveraged as a backup source. Nir Laufer's WSTS presentation explored several network architectures that utilize ePRTC in data center network synchronization to provide secure and resilient time.