This week, we began covering the Network Layer of networking. Specifically, we covered the data plane, which controls the way in which packets find their way from source to destination on a per-router basis. We discovered the logical components of a router, such as forwarding. We summarized the Internet Protocol, including IPv4 and IPv6. We looked at Addressing, the way that IP addresses are assigned. Finally, we looked at SDNs, or Software Defined Networks.