What do you need to test in DisplayPort interface?

Before video and audio content is sent over a DP link and displayed on the monitor screen a lot of communication has been occurring between a DP source and sink and a possible branch device.

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Poyiccot 8K Displayport 1.4 Cable, Short Displayport Cable 1feet, 32.4Gbps Diplayport to Displayport Cable, Anti-Wear Plastic Displayport Connector for Computer Monitor, Industrial Devices Testing : Electronics

What is DisplayPort (DP)?, Video