Can you help answer these three questions?

3. In Figure 3, computer A sends a message to computer D via LAN1, router Rl, and LAN2. Show the contents of the packets and frames at the network and data link layer for each hop interface. RI B/42 C/82 A/40 Receiver Sender LAN Figure 3. Two LANs connected via a router LAN 2 Suppose a computer sends a frame to another computer on a bus topology LAN. The physical destination address of the frame is corrupted during the transmission. What happens to the frame? How can the sender be informed about the situation? 4. 5. A signal travels from point A to point B. At point A, the signal power is 100 W. At point B the power is 90 W. What is the attenuation in decibels? If the signal travels further to point C where it is boosted and sent to point D. The final signal power at point D is measured to be