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* '''Bridge mode''': In Bridge mode A.K.A. In-Line mode, all received packets will be transmitted between corresponding port pairs (e.g. 1+2, 3+4 on Allegro 500) so that the Allegro can be placed inline between any network component.<br/ >The device will operate transparent and will not modify network traffic in any way. The additional latency will be typically around or less than 1 millisecond.<br>In Bridge mode it is also possible to process network traffic from a mirror port or Tap. However, "only" half of the total available ports on each respective Allegro Network Multimeter model can be used to operate in this way.  For example on a 4-port Allegro model 500, you can conveniently leave the unit in bridge mode and connect up to two mirror ports on interfaces 1 and 3 respectively. Aforementioned interfaces are physically separated and not an (in-line) interface pair.<br />Always avoid connecting mirror port traffic on an Allegro Network Multimeter interface pair (e.g. 1+2, 3+4 on Allegro 500), as this wil result in TX traffic in the direction of a mirror port which if highly undesirable.<br />[[File:Inline mode.jpg|800px|Allegro in brigde mode (in-line)]]

* '''Sink mode''': In Sink mode, the Allegro will operate "receive only".<br />Packets are not forwarded and there's no bi-directional traffic on any of the monitoring ports. This operation mode allows for installation at a Mirror port of a Switch or when using a network Tap to access the network traffic.<br />[[File:Sink mode1.jpg|800px|Allegro in Sink mode on Mirror port or Tap]]

Attention: Please always keep in mind, that while in bridge mode (Allegro = in-line), a Link will be (shortly) interrupted when switching processing mode or/and rebooting the Allegro Network Multimeter.