the higher management ask me to provide a high level description about what are need in case we want to define two SharePoint servers inside the same Farm . so if one SharePoint server is down the other server starts. I was reading about this and seem in general I can define a hardware load balancer that can check if one server is down to route the requests to the other server. But on SharePoint 2013 there is something called Request Management , where I can define routing rules and I can define the routing rules to be based on the server health.
So in my case can I use one of them (load balancer or Request Management) or I have to use both of them to implement the requirements of having 2 SharePoint servers inside the same farm, where in case on server went down the other server will handle the users requests.