 So, let us now try to summarize what all we have learnt in this week. We started with the idea of an analogy which led us to discovering the topics of layering within layering we saw the ideas of interfaces between layers, we saw the ideas of protocol across layers. Then we saw the concepts of how does a packet move from one end of a network to the other. In that we encountered the ideas of medium access control at the link layer, the ideas of routing at the network layer and the ideas of sequencing, segmentation, retransmission at the transport layer. We also saw that there is a need for addressing and that there were three levels of addresses, there was the MAC layer address, there was the IP address and there was the logical address what the functions of each of these addresses were. Now to put all of this together let us do an assignment.