Which three factors should be considered when implementing a Layer 2 protocol in a network? (Choose three.)

the Layer 3 protocol selected
the geographic scope of the network
the PDU defined by the transport layer
the physical layer implementation
the number of hosts to be interconnected

ccna exploration 1 chapter 7 Exam Question And Answers 

Which three factors should be considered when implementing a Layer 2 protocol in a network? (Choose three.)