Hey Chris, I was just wondering for the readings in Week 2, it says that the recommended reading is KR 5.1-5.2. However, looking at these sections, they are about the network layer and routing algorithms. Looking at KR 6.1-6.2 however, these are about the data link layer and error detection/correction. Just wanted to double check whether we are recommended to read 5.1-5.2 or if this was a mistake and it is 6.1-6.2? Thank you!