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Devcor is the name of the core certification for the Devnet Professional track. If you want to become Devnet Professional certified, you need to pass Devcor first, then take a concentration exam. Also if you want to go for the Devnet Expert lab, then Devcor is going to be the mandatory written exam for the lab as well.
Course preview:CCNP DEVCOR 350-901 Complete Course