Read the paper: https://pdos.csail.mit.edu/papers/chord:sigcomm01/chord sigcomm.pdf. This paper is one of the foundational papers about P2P networks and DHT in particular. This will give you an introduction into the idea of routing and storage in a distributed fashion. In our P2P project we are doing a much limited version of this, but hopefully you can see the parallels!

The summary should be a single page-ish (assuming it's single spaced). Focus your summary on a few aspects that you found interesting about the paper, you don't need to thoroughly walk through the entire thing. Keep it pithy!