What is the header size of a UDP packet?

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Transport Layer topics include: TCP, UDP, AH and ESP protocols. The transport layer is the fourth layer of the Open Systems Interconnection (OSI) model. It is responsible for ensuring that data packets arrive accurately and reliably between a sender and receiver.  The transport layer provides the following services: End-to-end delivery, Addressing, Reliable delivery, Flow control, Multiplexing, Congestion control.  The transport layer uses TCP or User Datagram Protocol (UDP) most often.  The transport layer's responsibilities include: Multiplexing: Combining multiple data streams into a... Show more

What is the header size of a UDP packet?