What is Pin Hole Congestion?

Question

TCP Flow Control relies on the window size reported in an ACK message. Congestion Control also relies on acknowledgement messages. I would like to know what the difference between the two terms, and how do they work.

Answer 1

A problem associated with distance-vector routing protocols if more than one connection to a remote network is known, but they are different bandwidths.

Distance Vector protocols view networks in terms of adjacent routers and hop counts, which also happens to be the metric used. So the router makes decisions about the way a packet will travel, based on the amount of hops it takes to reach the destination and if it had 2 different ways to get there, it will simply send it via the shortest path, regardless of the connection speed. This is known as pinhole congestion.