In Frame Relay, the BECN bit is set by:

A Permanent Virtual Path (PVP) connection switches cells by looking at the:

You work as a network engineer at Domain.com. There is a connection routed between two IGXs on a single trunk. That trunk fails, and the connection re-routes via another IGX, so it is now a two-hop connection. The failed trunk is repaired. Absent a preferred route, what happens?

For communication systems, what describes the over-all health of the system?