Which layer of the osi model is most directly impacted when an internet services provider is found to be blocking udp traffic from a source host?

The Open Systems Interconnection Reference Model is an abstract description for layered communications and computer network protocol design. In its most basic form, it divides network architecture into seven layers which, from top to bottom, are the Application, Presentation, Session, Transport, Network, Data Link, and Physical Layers. A layer is a collection of conceptually similar functions that provide services to the layer above it and receives service from the layer below it.

UDP- User Datagram protocol (UDP), is a part of internet protocol suite. It is basically present on the Transport layer of the "Internet Network Model"

Step-by-step explanation:

As the Transport layer  of the model, the UDP, SCTP and TCP's are present. Now originally in the TCP/IP model there are four layers:

Host-to-network layer,Network layer,Transport layer,And the Application layer.Now, as the blockage occurred is from source to host then the data flow through the channel on specific internet protocols will halt, so the Host-to-Network layer is been affected by this blockage.

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