Hi everyone
In the " Networking Primer - Layers 1-4" there is a question “What addressing mechanism is used at the Link Layer of the TCP/IP model?”. I feel pretty sure that it uses the MAC, but that doesn’t seem to be the correct answer.
I got the rest and I’m unsure if it is a format issue.
Anyone? 
You are correct, but you are missing something from it. Search the Networking Primer - Layers 1-4 module.
Thanks. It’s incredible that 15mins was needed to find a missing hyphen 
I was pretty sure with my answer also. The proper format took a while 
Yep, this annoyed me.
Without giving the answer the format is C-a***s hyphen included. lower case for the second half
MAC-address