I have come across the term full and incomplete physical path several times in the context of whether a logical path is spanned by a full/incomplete physical path. I would like to understand and learn what this means and how it works.
I have one example below (you have to click on the image because some of the lettering may be blurry):
Apparently this is an example of the physical path "under" the Ethernet link not being full - because there is no connection between Connection Panel A.2 and Connection Panel B.2. If there was a connection there one could say that there are no gaps and the physical path for this Ethernet Link is complete.
I understand that for the physical path to be complete, the connection would have to go from Back B of Connection Panel A.2 to Front A of Connection Panel B.2 (or from Back A to Front B). Why is this the case? Does such an incomplete path change anything in practice? As far as I know Location A and Location B will have a connection through the Ethernet Link anyway (additionally, some connections are spanned - relationship between path and connection - red arrows/spans) - so I don't understand in what context a full and incomplete physical path is used. Could someone please explain this to me? Thanks in advance for any answer!
The diagram is from the training I was at, so I don't have a link unfortunately. It was shown in the context of distinguishing the physical path from the logical path (Ethernet Link). We have devices such as routers and connection panels (is a device with ports - optical or electrical - positioned directly on the device, that are used for pre-patching or for patching purposes), but instead of a router it could also be e.g. DWDM devices, and instead of connection panels - ODF devices.