Summary

In this chapter, we learned how data is sent from one device to another over the network. We learned about how data is encapsulated in the TCP/IP protocol and what fields are added to each header. Next, we learned about a very important network manipulation and packet crafting tool called Scapy. We also learned how to craft packets using Scapy and how these packets can be sent over the network. We then learned about the ARP protocol and finally, we created an ARP scanner to get the IP and mac addresses of live devices in a network. In the next chapter, we will learn how to use this scanner to create a man-in-the-middle attack to intercept network traffic from a victim machine.