Data! Data is usually on servers, so if you're asking what physical component, it would be servers.
Wiring
--> Performance degradation --> security issues --> host identification
Netstat is a command-line tool that displays network connections and a number of network interface and network protocol statistics. It is used to find problems on networks and determine how traffic effects performance.
"Managed network services provide similar services as in-house IT services. They manage online servers, fix IT problems, do design work, and performance monitoring."
A client requests services across a network.
Performance
processing delay
Network Interface Card (NIC)
Protocol
1. The software component that intercepts a client request for a network resource and forwards it
The purpose of network performance monitoring is to allow network administrators to create the best operating condition by reporting on the network activity and locating where the network is not operating to it's full potential. Network Performance Monitoring can find faulty routers and switches as well as identifying networks that are hogging the bandwidth.
A network manager would like to have network management capabilities when (a) a component of the network fails, (b) a component of the network is about to fail, and is acting "flaky" (c) a component of the network has been compromised from a security standpoint and is attacking the network, e.g., by launching a DOS attack by flooding the network with packets, (d) traffic levels exceed a certain threshold on a link, causing packets to be dropped, (e) everything is running smoothly (in order to know that everything is running smoothly and there are no problems). There are many additional reasons as well.