If UDP, like IP, is unreliable, why do we need this transport layer protocol? Why not just use IP directly?Question 4Select one:UDP adds port numbers, which allow multiple applications to use the UDP layer.IP provides a best-effort service while UDP does notUDP is a connection oriented protocol, IP is notUDP provides sequence numbering of delivered segments

The main reason we need the User Datagram Protocol (UDP), despite its unreliability like Internet Protocol (IP), is because UDP adds port numbers. These port numbers allow multiple applications to use the UDP layer simultaneously. This is a feature that IP does not provide.

While both UDP and IP provide a best-effort service, meaning they do their best to deliver the packets but do not guarantee delivery, UDP has the added advantage of allowing individual processes to be identified via port numbers.

Contrary to one of the options, UDP is not a connection-oriented protocol. It is a connectionless protocol, which means it does not establish a connection before sending data. This makes it faster than connection-oriented protocols because it does not have to wait for acknowledgements before sending more data.

Lastly, UDP does not provide sequence numbering of delivered segments. This is a feature of TCP (Transmission Control Protocol), not UDP. Sequence numbers in TCP allow the receiver to reorder received segments into their original order.