die Anschlussstelle
junction
An entrance or exit ramp that connects a road with a motorway or expressway.
Wir müssen an der nächsten Anschlussstelle von der Autobahn abfahren.
We have to get off the motorway at the next junction.

junction / connection point
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junction
An entrance or exit ramp that connects a road with a motorway or expressway.
Wir müssen an der nächsten Anschlussstelle von der Autobahn abfahren.
We have to get off the motorway at the next junction.

The word is made up of 'der Anschluss' (connection) and 'die Stelle' (place/point). So it literally describes a place where a connection is possible, whether on the road or in technology.
An dieser Stelle wird eine neue Anschlussstelle für die Autobahn gebaut.
A new motorway junction is being built at this spot.
The context makes clear which meaning is intended. Words like 'Autobahn' (motorway), 'abfahren' (to exit), or 'A8' point to the road connection. Terms like 'Router' (router), 'Kabel' (cable), or 'Port' (port) indicate the technical meaning.
Die Anschlussstelle Hamburg-Moorburg war wegen eines Unfalls gesperrt.
The Hamburg-Moorburg junction was closed because of an accident.
In the context of motorways, the phrases 'die nächste Anschlussstelle nehmen' (to take the next junction) or 'an der Anschlussstelle abfahren/auffahren' (to exit/enter at the junction) are often used.
Um nach Hause zu kommen, müssen wir die nächste Anschlussstelle nehmen.
To get home, we have to take the next junction.
When you are at an Anschlussstelle (junction) or perform an action there (e.g. exiting), you use the preposition 'an' with the dative.
An der Anschlussstelle Köln-Ost gibt es oft Stau.
There is often traffic at the Cologne-East junction.
connection
'der Anschluss' and 'die Anschlussstelle' both have to do with a connection. 'der Anschluss' is more general: it can mean a technical connection or, in transport, an onward connection, such as the next train. 'die Anschlussstelle' is more concrete. It means either an entrance or exit ramp to a motorway, or a technical point where something can be connected. Learners may confuse the words because both come from 'anschließen'. When it is about the connection itself, 'Anschluss' usually fits. When a specific place or point is meant, 'Anschlussstelle' is more precise.

Vor dem Termin fährt mein Kollege an der nächsten Anschlussstelle von der Autobahn ab.
Before the appointment, my colleague gets off the motorway at the next junction.
Wegen der Verspätung haben wir den Anschluss nach Hamburg verpasst.
Because of the delay, we missed the connection to Hamburg.