In a third-class lever, the input force is applied between the fulcrum and the load, and both move in the same direction. The amount of applied force is always greater than the output force of the load, but the load is moved a greater distance than that over which the input force is applied.
Broadcasts are generally used for several reasons: Address Resolution Protocol (ARP) uses broadcasts to map physical addresses to logical addresses. To build the table of hosts, a device needs to send a broadcast to every other device on the network to essentially find out who is where.
When hubs receive an electrical signal in one port, the hub repeats the signal out all other ports. 2. When two or more devices send at the same time an electrical collision occurs, making both signals corrupt. 3 Broadcasts sent by one device are heard by all devices on the LAN. 4. Unicast frames are heard by all other devices on the LAN.