 We've covered a number of commands over the last three weeks starting from basics of moving around the operating system like LS, CD, creating files and so on and then last week learning about some information about the network using what? ETH tool using So ETH tool shows us something about the Network interface device the LAN card IF config shows us something about a network interface from the operating system perspective IP address MAC address We can show all interfaces with IF config, IF config minus a Including those that are turned off. We can talk about interfaces are on and off There's a special interface there the loop back interface Loop back is used. There's no piece of hardware, but it's used for sending to yourself for testing purposes and And my wireless LAN interface is shown there. It's turned off at the moment. So we're not using the wireless LAN interface We've seen a few other commands like netstat Show the statistics plus some other options with netstat We've seen ARP shows the mapping of IP addresses to MAC addresses Routing table using the route command. So some of the networking information we've seen from those commands Today we're going to start to investigate how some of the network protocols work so You may see on your desktop that there's a new folder called notes Under the notes folder. There's a file called packet capture, which is a presentation Which I'm about to show you so if you want to look at that on your desktop under the notes directory. There's this PDF