3. Is there a limit on the number of repeaters that can be employed?
Yes. The number of repeaters is limited by the "5-4-3 rule." Under this rule there can be no more than 5 segments with no more than 4 repeaters between any two stations. Only 3 of the 5 segments can be populated (i.e., contain nodes or hosts). In this case a "station" is a bridge, router, or gateway. Thus, adding a bridge can allow additional repeaters to be used on the LAN.