What do the different colors in Simulation mode Event List under Type mean?

When I do the exercise b on p3 in the PDF link below, at first, it fails.https://contenthub.netacad.com/legacy/I2PT/1.1/en/course/files/3.1.1.3%20Packet%20Tracer%20-%20Explore%20Network%20Functionality%20Using%20PDUs.pdf I try again three times and i...