I’m managing 100+ nodes in our school network. I’m running Server 2008 R2 Domain network. The problem I’m facing is our communications breaks with clients and clients with server and clients with clients time by time. I tried to troubleshoot my network by pinging our clients then I saw there are so many breaks in ping and drops communication and some times it works great, i tried to unplugged switches and different clients but issue is still there. How can I troubleshoot this situation? We’ve so many nodes and 8+ switches which connecting 4 buildings and inside there’s devices. Please help me on this issue. Is there any culprit device or some virus issue?