Video presentation: "Transport layer: Connectionless Transport: UDP." UDP sender and receiver actions. UDP segment structure. The Internet checksum.

Computer networks class.
Jim Kurose
Textbook reading: Section 3.3, Computer Networking: a Top-Down Approach (8th edition), J.F. Kurose, K.W. Ross, Pearson, 2020.
See http://gaia.cs.umass.edu/kurose_ross for more open student resources.