Which of the following network appliances can BEST be described as allowing multiple servers toshare requests for a website through the same public IP address?（）

A network technician wants to use a packet analyzer to troubleshoot a reported problem with a user's workstation with IP address 192.168.1.45. To identify the workstation's packets the technician wants to use the workstation's MAC address.
Which of the following protocols would provide the needed information?（）