Why must the server application be executed before the client programme? Why is it feasible for the client programme in a client-server application using UDP to run before the server programme?

Can trustworthy data transfer be achieved by an application even if it uses UDP? And if so, how would you go about achieving it?

Pretend that a client can retrieve a file from a remote server at a known address using UDP. The client first sends a file name request, and the server responds with a series of data packets containing various file components. Client and server utilize a stop-and-wait protocol to assure delivery dependability. Does this protocol have a problem besides obvious performance issues? Consider the potential of process failure?

Match left-column statements to right-column architectures. Always-on server. Processes may provide or receive service. Any communication has a client and server. It's HTTP. User-controlled hosts may be up or down. Self-scalable. A. Peer-to-peer. B. Not client-server or peer-to-peer. C. Client-server/peer-to-peer. D. Client-server. E. TCP/IP.