5. Identify whether each MAC address is valid or invalid. If invalid. give a reason. a. 12-34-56-78-90-AB-CD b. 12-34-56-78-90-AB c. GH-12-34-56-78-90 6. Convert the MAC address 2A-3B-4C-5D-6E-7F from hexadecimal to binary. Make sure it 7. An Ethernet frame contains 1250 bytes of payload data. Calculate the percentage oft frame that is overhead (do not include the preamble in the frame). In order to do this, you will need to look up the length of the header and trailer. ume an Ethernet frame is to carry only 28 bytes of payload data. How many bytes of padding must be added to the frame? 8. Ass 9. A switched Ethernet local area network contains the following devices: A switch with 4 ports, numbered 1 -4 Host A (MAC address AA-AA-AA-AA-AA-AA) connected to port 1 - Host B (MAC address BB-BB-BB-BB-BB-BB) connected to port 2 - Host C (MAC address CC-CC-CC-CC-CC-CC) connected to port 3 - A gateway router (MAC address DD-DD-DD-DD-DD-DD) connected to port 4 a. Sketch the LAN. b. Show the forwarding table inside the switch