Point to remember for CISA Exam:(1)Data link layer works on MAC address whereas Network layer works on IP address.(2)Network layer inserts IP address and routing whereas transport layer ensure proper delivery.(3)When CISA question is about electric signal or hardware devices, our answer should be physical layer.(4)When CISA question is about MAC address, our answer should be data link layer.(5)When CISA question is about routing or IP address, our answer should be network layer.(6)When CISA question is about reliable delivery or connection oriented or congestion control or order of sequence, our answer should be transport layer.(7)When CISA question is about establishing connection, our answer should be session layer.(8)When CISA question is about acceptable format, our answer should be presentation layer.(9)When CISA question is about end user, our answer should be application layer.