1. Why does UDP exist? Would it not have been enough to just let user processes

1. Why does UDP exist? Would it not have been enough to just let user processes send raw IP packets?2. Consider a simple application-level protocol built on top of UDP that allows a client to retrieve a file from a remote server residing at a well-known address. The client first sends a request with a file name and the server responds with a sequence of data packets containing different parts of the requested file. To ensure reliability and sequenced delivery client and server use a stop-and-wait protocol. Ignoring the obvious performance issue do you see a problem with this protocol? Think carefully about the possibility of processes crashing.