Answer:
Processing delay is one part of the total delays occurred in the network. Processing delay occurs during end-to-end transmissions. Routers are computing and exchanging devices that are specialized to make quick decisions regarding what to send and where to direct the processed packets, different software and hardware being used in the routers to achieve better performance of routing decision. Computer engineers and network engineers working hard to develop software and optimized circuitry in routers so that can reduces the time it takes by routers to decide, thus reducing the processing delay.