The two major protocols at layer 4 are TCP and UDP. Those are not the only two protocols, but those are the two that we're going to see most of the time. Watch this entire CompTIA Network+ (N10-008) training course: https://training.cbt.gg/slo
Check out our blog article _What are Transport Layer Protocols?_ for more info: https://blog.cbt.gg/ioxl
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