Implicit Signaling In implicit signaling, there is no communication between the
congested node or nodes and the source. The source guesses that there is congestion
somewhere ~n the network from other symptoms. For example, when a source sends
several pac~ets and there is no acknowledgment for a while, one assumption is that thenetwork is congested. The delay in receiving an acknowledgment is interpreted as congestion in tlie network; the source should slow down. We saw this type of signaling
when we discuss TCP congestion control in Chapter 24