Forest path in Great Smoky Mountains National Park, Tennessee (© putmanphoto/Getty Images)

This specification defines a mechanism that allows implementations of the Internet Key Exchange Protocol Version 2 (IKEv2) to indicate the

Bidirectional Forwarding Detection (BFD) is expected to be able to monitor a wide variety of encapsulations of paths between systems.

Flock of Swaledale sheep in North Yorkshire, England (© R A Kearton/Getty Images)