As defined in RFC 768, a UDP is a connection-less protocol, which is great for transmitting real-time data between hosts and is often termed as an unreliable form of communication. The reason for this is that UDP doesn't care about the delivery of packets, and any lost packets are not recovered because the sender is never informed about the dropped or discarded packets during transmission. However, many protocols such as DHCP, DNS, TFTP, SIP, and so on rely only on this. The protocols that use a UDP as a transport mechanism have to rely upon other techniques to ensure data delivery and error-checking capabilities. And these protocols are inbuilt with such features, which can provide some level of reliability during the transmission. A point that we should not to forget is that a UDP provides faster transmission of packets as it is not concerned about the initiation of the connection or graceful termination as seen in the TCP. That's why a UDP is also referred to...