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UDP scan works by sending a UDP packet to every targeted port. For most ports, this packet will be empty (no payload), but for a few of the more common ports a protocol-specific payload will be sent. Based on the response, or lack thereof, the port is assigned to one of four states, as shown in Table 5.3. User Datagram Protocol or Universal Datagram Protocol: Connection: Transmission Control Protocol is a connection-oriented protocol. User Datagram Protocol is a connectionless protocol. Function: As a message makes its way across the internet from one computer to another. This is connection based. UDP is also a protocol used in message transport Arcserve UDP is designed to bring technologies together in a way that simplifies the infrastructure running a combination of on-premises, virtual and SaaS-based applications and systems. Without a comprehensive solution spanning these different application environments, organizations may be susceptible to downtime and data loss. A User Datagram Protocol port is an internetworking software abstraction, not a physical thing like a USB port. In Internetworking with TCP/IP, Douglas Comer explains, "We will imagine that each
List of TCP and UDP port numbers - Wikipedia
What is User Datagram Protocol (UDP)? - Definition from Mar 07, 2018 What Is User Datagram Protocol(UDP) and What Is It Used for？
If it uses the UDP protocol to send and receive data, it will use a UDP port. Figure 1, below, is a represenation of an IP address split into its many TCP and UDP ports.
What is a UDP port? | Network World