This is a follow-up to a previous question. Follow-up questions can occur any time during the interview and do not necessarily have to immediately follow the question to which they are referring. Interviewers use this technique to determine that you are answering questions consistently throughout the interview. You should be prepared for follow-up questions at any time.
"I have direct experience working with or am at least familiar with the most popular network monitoring tools on the market. These include SolarWinds, which monitors SNMP devices, Datadog, which is a cloud-based SaaS service, ManageEngine's OpManager, which monitors the performance of network devices including servers, routers, and switches in real-time, and Paessler PRTG, which is a free network monitoring suite and has the dashboard feature I mentioned earlier."