21. Interfaces between peripheral devices and the computer. a. ports b. cables c. both a and b d. none of these

22. Often called Com ports - (communication) Com1, Com2 etc. a. USB port b. Serial port c. both a and b d. none of these

23. A 25-pin port used to connect printers, scanners, external hard disks, zip drives etc. to the computer. a. Serial Port b. Parallel Port c. both a and b d. none of these

24. A port dedicated to the graphics system. a. VGA b. DVI c. both a and b d. none of these

25. Number of devices that can be connected to a USB. a. 120 b. 137 c. both a and b d. none of these

26. Used to connect to a network. a. ethernet b. internet c. both a and b d. none of these

27. Acts as the vital link between a device and its source of power. a. power port b. power supply c. both a and b d. none of these

28. Instructs the computer on how to perform a number of basic functions such as booting and keyboard control. a. POST b. BIOS c. both a and b d. none of these

29. Small software programs that help the operating system use or "drive" the device a. device b. drivers c. both a and b d. none of these

30. If your computer boots from your hard drive, how can you boot from a flash drive? a. press F4 b. press F6 c. both a and b d. none of these​