单项选择题 Office A is located 500 miles (805 kilometers) away from Office B, yet they are on the same private network. Which of the following is MOST likely being used to accomplish this scenario?（）

单项选择题 customer wants to network several computers within a large warehouse. The warehouse has one computer at the very far end of the warehouse that is 170 meters (557 feet) from the network switch. Which of the following cable types should a technician use for this computer?（）

单项选择题 A company is about to install a second network connect on with a new ISP. Which of the followingrouting protocols is the BEST choice?（）