A monitor that stays black can turn a simple ticket into a time sink. CompTIA A+ 220-1201 Objective 3.2 treats that problem as a basics test: can you identify common video cables, know what each one carries, and pick the right connection without guessing?
Your goal is practical. By the end, you should be able to recognize HDMI, DisplayPort, DVI, VGA, and USB-C by sight, know whether they carry video only or video plus audio, and choose a cable for a basic setup (or swap one during troubleshooting). You should also expect adapters in real support work, because laptops, docks, projectors, and older monitors rarely share the same ports.
What the A+ exam expects you to know about video connectors
Objective 3.2 is less about memorizing versions and more about making correct matches: port to cable, cable to display, and signal type to adapter. In this context, a signal is the form the video takes as it moves from the source device (PC, laptop, console) to the display (monitor, TV, projector).
You also need the big picture distinction: analog vs digital. Most modern displays use digital links because they resist noise, stay sharp at higher resolutions, and support extra features like audio on the same cable. The exam stays in general terms, so think in outcomes: newer standards tend to support higher resolution and refresh rate than older ones, and cheap or long cables can cause dropouts.
A simple memory aid helps under time pressure: HDMI is the TV default (audio included), DisplayPort is common on PCs (often on business monitors and docks), DVI is older digital video (usually no audio), VGA is older analog, and USB-C is a connector that may carry video depending on the mode and port support.
Analog vs digital in one minute: why VGA stands out
VGA is the outlier because it carries analog video. Analog signals can look soft at higher resolutions, and they are more sensitive to interference from poor shielding, long runs, or loose connections. That is why VGA problems often look like blur, ghosting, or color shift.
HDMI and DisplayPort are digital, and USB-C video is digital when it uses DisplayPort Alt Mode or Thunderbolt. DVI is usually digital in practice, although some DVI types can also carry analog.
Cable, port, and standard: the common mix-ups
A connector is the shape you can see and touch, the port is the receptacle on the device, and the standard is the rule set that decides what features the link supports. People confuse these because the same connector can show up across devices with different capabilities.
USB-C is the best example. USB-C can carry video, but not every USB-C port supports video output. Support depends on the device and its features (such as DisplayPort Alt Mode, Thunderbolt, or USB4). In the field, you confirm with port icons, vendor specs, or a known-good cable and display.
HDMI, DisplayPort, DVI, VGA, and USB-C: how to identify them and when to use each
You do not need deep version history for A+. You do need to recognize each connector, know what it typically carries, and predict the most common failure points. Think of cables as the “bridge” between devices. If the bridge is wrong, worn, or mismatched, the system behaves as if the display is broken.
HDMI: the common TV and monitor cable that also carries audio
HDMI has a flat, tapered plug and is widely used on TVs, monitors, game consoles, and many laptops. It carries digital video and digital audio on one cable.