Which of the following protocol adds no reliability, flow-control, or error recovery to IP and simply serves as a multiplexer/demultiplexer for sending and receiving datagrams, using ports to direct the datagrams?

Internet Protocol (IP)

Internet Control Message Protocol (ICMP)

Address Resolution Protocol (ARP)

User Datagram Protocol (UDP)

Answer:
User Datagram Protocol (UDP)

Note: This Question is unanswered, help us to find answer for this one