a. Suppose the example used a layer-2 VPN protocol called L2TP. Draw the messages and the packets they would contain.
b. Suppose the Web server was an email server. Draw the messages from the email server to the employee's computer. Show what packets would be in the message.
c. Suppose the office connects to its ISP using metro Ethernet. What packets would be in the message from the office router to the ISP?
d. Suppose the employee connects to the ISP using a layer-2 protocol called XYZ. What packets would be in the message from the employes's router to the ISP.