 you've spent a lot of effort setting up the nodes, running some experiments, analyzing the network and security. Now it comes to the end of your lab or your day and you want to shut down. What are your options? Of course you can power off the nodes. Let's try that on node 3. We can simply use the command to shut down gracefully the Linux computer. Pseudo power off and password is necessary network. Node 3 will be shut down so tomorrow when we come in we need to boot that up. Now note it takes some time for the nodes to boot sometimes so that's maybe not the best option but node 3 is powered off. Node 2 if you don't want to do it from the command line you can sort of pull the plug on the computer. You can simply say power off here and like pulling the plug on a computer you may lose some data but it shouldn't be a problem in most cases. Power off node 2 but again because we often don't want to have to reboot them and wait for them maybe the best option is to save their state. So don't power them off. With VirtuaBox we can just save where they're currently running so the next time we want to start we just start from where we left off. So to do so the node 1 is running right click close it but choose save state. Save state will save that node so if I wanted to start node 2 I'd have to boot the Linux computer again it would take some time but to start node 1 we would just click start now it's saved. It restores it from a file and we're automatically logged in to node 1 and we have we can take off from where we finished last time. So the best way I recommend if you want to shut down the nodes don't shut them down save their state so you can start them fresh next time. If you want to get rid of them and you'd no longer need with the configuration then you can shut them down close either save state or power off and if you want to start from scratch the best way is just delete them. Select them all remove delete all the files and the next time you'll need to run the command script to clone the base again now that will take time but it's a way to to refresh everything and now we can run our script to recreate a new topology or an existing topology but it'll be fresh.