A key focus area while performing operations on multiple devices is how quickly we can perform the actions. To put this into perspective, if each router takes around 10 seconds to log in, gather the output, and log out, and we have around 30 routers that we need to get this information from, we would need 10*30 = 300 seconds for the program to complete the execution. If we are looking for more advanced or complex calculations on each output, which might take up to a minute, then it will take 30 minutes for just 30 routers.
This starts becoming very inefficient when our complexity and scalability grows. To help with this, we need to add parallelism to our programs. What this simply means is that we log in simultaneously on all 30 routers, and perform the same task to fetch the output at the same time. Effectively, this means that we now get the output on all 30 routers...
