ISDN is considered to be a type of circuit-switched connection WAN connection.
What is a WAN?
WAN is an acronym for wide area network and it can be defined as a telecommunication network that covers a wide range of geographical locations, especially for the purpose of communication between different users in different countries or regions across the world.
Integrated Services Digital Network (ISDN) is considered to be a type of circuit-switched connection wide area network (WAN) connection.
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