| Subject | English | Polish |
| commun., comp. | data link layer | warstwa łącza danych |
| comp., MS | data-link layer | warstwa linku danych (Layer two of the OSI model. A layer that packages raw bits from the physical layer into frames (logical, structured packets for data). This layer is responsible for transferring frames from one computer to another, without errors. After sending a frame, the data-link layer waits for an acknowledgment from the receiving computer) |
| commun. | link layer | warstwa łącza |
| commun. | X.25 link layer | warstwa łącza |