“The page below is from the manual of PRTG, our quick-to-install and easy-to-use network monitoring software”

Aurelio, System Admin at Paessler AG

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SNMP uses UDP

UDP stands for User Datagram Protocol and is the opposite of TCP (Transmission Control Protocol).

User Datagram Protocol (defined by RFC 768) is very low overhead, fast and unreliable while TCP is a very reliable and high overhead protocol.

The unreliability comes in the form of checks and balances whereas if TCP sends something, it waits for an acknowledgment and if it doesn’t hear back, it will resend.

Since logging of devices usually happens within a time period that is cyclic in nature, it’s common sense that you missed the event and you’ll catch it next time… the tradeoff being that the low overhead protocol is simple to use and doesn’t eat up all your bandwidth like TCP based applications going across your WAN.

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