Cs6250 Computer Networks Exam 1 | 70 Questions With 100% Correct Answers | Latest Update | Verified

When would an application layer protocol choose UDP over TCP? {Ans: When developers need just a simple mechanism for transmission control. Typically, use UDP in applications where speed is more critical than reliability. For example, it may be better to use UDP in an application sending data from a fast acquisition where it is acceptable to lose some data points. You can also use UDP to broadcast to any machine(s) listening to the server. https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z000000P9ZLSA0#:~:text=Typically%2C%20use%20UDP%20in%20applications,s)%20listening%20to%20the%20server.}What are the differences between UDP and TCP? {Ans: UDP is A.) an unreliable protocol as it lacks the mechanism that TCP has in place. B.) a connectionless protocol that does not require the establishment of a connection (example: three way handshake) before sending packets. Some benefits to UDP are: A.) no congestion control or similar mechanisms. B.) No connection management overhead. The UDP packet structure is a 64 bits header consisting: 1.) Source and destination ports. 2.) Length of the UDP segment (header and data). 3.) Checksum (an error checking mechanism). Since there is no guarantee for link-by-link reliability, we need a basis mechanism in place for error checking. The UDP sender adds the src port, the dest port and the packet length.