![]() TCP operates at the OSI layer 5 (Transport) and powers most of the internet traffic. With TCP we are directing our monitoring requests not just to the host, but also to a specific service by defining a port on which it should be reachable. ![]() ![]() Nevertheless, all of the principles outlined here are equally applicable. We won’t focus this lesson on ICMP because it’s more for network level monitoring.If successful you basically know that the network device you were contacting is powered and alive, but not much else.It operates mostly at the layer 3 Network of the standardized OSI Model. ICMP (sometimes referred to as ping) is the lowest level protocol of the three and works by firing “raw” IP packets (echo requests) to the end host/ip address.So let’s go one by one and explore them in more detail: Each of these protocols operate at a different network level and thus each has varying options of what it can check. Each one refers to the underlying protocols that’s utilized for the monitor. When discussing Monitors, there are three main monitor types to consider. It works by defining Monitors that check your host to ensure they’re alive. Heartbeat helps you monitor your service availability. But to actually know that “something is down” or just “not performing” you need to consistently monitor your services day in day out and that’s how Heartbeat from the Elastic Beat family helps you with Uptime Monitoring. Whenever you build a service and expose a set of endpoints to provide API access to that service, you’ll likely need to track their availability and response times, aside from ensuring their functionality.
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