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UDP
User Datagram Protocol (UDP) is one of the primary network transport protocols (along with TCP) that enable data transfer across the Internet. It provides a connectionless transmission model, unlike TCP which provides a connection-based transmission model. Many network services and applications communicate on various UDP ports. Nagios Core and Nagios xi are capable of monitor applications and services that communicate over UDP.
Unconfigured Objects
These are objects that check results in Nagios are being received (usually passively via NSCA or NRDP) however no configuration exists for the objects.
Nagios xi stores a list of these items and can be easily added to the configuration from the Unconfigured Objects page.
UNIX
A generic terms used to cover multiple different UNIX-based operating systems (e.g. Solaris, AIX, HP-UX).
User Experience Monitoring
Usually refers to monitoring how well web applications work for end users. See Web Transaction.
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