Most administrators of midsize networks choose to dedicate an entire server to monitor software and, sometimes, a whole server just for Nagios Core. This is because of the following two main factors that are common to most comprehensive Nagios Core setups:
They have a lot of privileges because in order to inspect the running state of so many different hosts and services, they need to be conferred with an appropriate network to those services. This often means that their IP addresses are whitelisted all over the network. A user who is able to assume this privilege could potentially do a lot of damage.
They have a lot of work to do and hence ideally have dedicated software and hardware resources to run what can be thousands of host and service checks smoothly and to promptly notice problems and recoveries. If a Nagios Core server is not able to keep up with its check schedule, it could cause delays in notification about very important services.
It's, therefore, very important to...