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You should be familiar with the types of ports and connectors, where they are located, and which devices they support.

Port/Cable Common Device(s)
              
DB-9 Serial port
Serial device (such as a serial mouse or external modem)
CGA/EGA monitor (less common)
           
DB-25 Parallel port
Printers
           
DB-15 (two rows)
Joystick or MIDI device (game port)
           
High Density DB-15 (three rows)
VGA/SVGA monitor
           
DVI Video port
Digital monitor
         
6-pin Mini-DIN
PS/2-style keyboard or mouse
By convention, purple connectors are used for the keyboard, and green connectors are used for the mouse.
    

TRS                              
Speaker or microphone
Common color codes for connectors are:
  • Red (pink) = Mic In
  • Blue = Line In
  • Green = Line Out
              
RJ-11 (four wires)
Internal modem or telephone
          
RJ-45 (eight wires)
Ethernet network
             
USB Type A
Printer
Scanner
Camera
Printer
Mouse
Keyboard
External CD-ROM drive
MP3 player
PDA
      
Firewire 6-pin
Video cameras (most common)
Less commonly, similar devices that use USB connectors such as printers or external drives