USB hubs Flashcards

Question

Cleaning mouse (optical mouse)

Answer 1

On the rare occasion where an optical mouse begins to act erratically, try using a cloth or damp cotton swab to clean out any bits of dirt that may be blocking the optics.

Answer 2

Biometric devices scan and remember unique aspects of various body parts such as your retina, iris, head image, or fingerprint, using some form of sensing device such as a retinal scanner. The computing device uses this information to prevent unauthorized people from accessing the secured device.

Answer 3

a USB device that replaces standard user name and password security. When a program or website asks for a user name and password, you simply press your finger against the fingerprint scanner. It confirms your identity (assuming your fingerprint matches), and then special software that comes with the scanner supplies the program or website with your stored user name and password.

Answer 4

Install the device. Register your identity with the device by sticking your eye, finger, or other unique body part (Why are you snickering?) into the device so it can scan you. Configure its software to tell the device what to do when it recognizes your scanned identity.

Answer 5

standard Universal Product Code (UPC) bar codes Bar codes are a pretty simple way to encode data. The scanner reads the bars in only one dimension (side to side) and determines the value based on the widths and spacing of the lines.

Answer 6

Pen scanners look like an ink pen and must be swiped across the bar code.

Answer 7

Hand scanners are held in front of the UPC code while a button is pressed to scan.

Answer 8

All bar code readers emit a tone to let you know the scan was successful. Older bar code readers used the venerable PS/2 ports; modern ones use USB ports. No configuration is usually necessary, other than making sure that the particular bar code reader works with whatever database/point of sale software you use.

Answer 9

Quick Response (QR) codes can hold more data, because they encode it in two dimensions using the size and grouping of small black squares. Many QR codes contain a URL that leads to more information; scanning one with a smartphone will open the default browser and navigate to that URL. But you can also stick any old text - maybe a joke, poem, or a reminder - in a QR code.

Answer 10

Modern Windows operating systems offers Pen and Input Devices; (Note that the Tablet PC Settings applet appears only if you have a touchscreen, like on a Microsoft Surface.) You can use this applet to adjust how you interact with the touchscreen just as you would with the Mouse or Keyboard applets. The applet enables you to configure what happens when you tap, double-tap, use gestures called "flicks," and more.

Answer 11

A keyboard, video, mouse (KVM) switch is a hardware device that most commonly enables multiple computers to be viewed and controlled by a single mouse, keyboard, and screen. Some KVMs reverse that capability, enabling a single computer to be controlled by multiple keyboards, mice, or other devices. KVMs are especially useful in data centers where multiple servers are rack mounted, space is limited, and power is a concern.

Answer 12

o use a KVM, you simply connect a keyboard, mouse, and monitor to the KVM and then connect the KVM to the desired computers. Once connected and properly configured, assigned keyboard hotkeys—a combination of keys typically assigned by the KVM manufacturer—enable you to toggle between the computers connected to the KVM. In most cases, you simply tap the SCROLL LOCK key twice to switch between sessions.

Answer 13

Installing a KVM is not difficult; the most important point to remember is to connect the individual sets of cables between the KVM ports and each computer one at a time, keeping track of which keyboard, mouse, and video cable go to which computers. (I highly recommend labeling and using twist or zip ties.) If you get the connections wrong, the KVM won't function as desired. If you connect a mouse and keyboard wires to the correct KVM port, for example, but attach the same computer's video cable to a different port on the KVM, you won't get the correct video when you try to switch to that computer. The same holds true for the mouse and keyboard cables. Don't cross the cables!

Answer 14

Joysticks and gamepads have used plenty of connectors over the years, including the eponymous joystick connector. These days, they all connect to computers via USB or wireless connections. Depending on the complexity of the controller, you may need to install drivers to get a joystick or gamepad working. Simpler controllers, however, can probably get by using the default gamepad drivers included in Windows and macOS. You'll need to configure your joystick or gamepad to make sure all the buttons and controls work properly. In Windows, use the Devices and Printers applet under the Control Panel.

Answer 15

A magnetic reader reads the encoded strip on the back of a credit card. Because there have been security issues with these strips, modern credit cards usually also have an embedded chip, and merchant terminals with chip readers can process credit cards that way, increasing the security of the transaction. Some of the higher-end credit card processing systems also include a "tap to pay" feature that employs near field communication (NFC), a very short-range wireless networking technology, to read data from a credit card's chip simply by tapping or waving the card over a sensor. Connecting merchant services hardware is usually fairly self-explanatory; merchant services companies make their stuff as foolproof as possible so everyone will be able to use it. You can connect a card reader to a smartphone, tablet, laptop, or PC. If there's a USB port on the computing device, you can usually hook up the card reader that way. If not, you may be able to use a headphone jack (on some smartphones) or use a wireless connection. Configuring and using a card reader system is dependent on the software that comes with it.

Answer 16

Exam Tip: Most folks use their smartphones today for casual pictures and video, but the CompTIA A+ 1001 objectives assume that your digital cameras are separate stand-alone devices.

Answer 17

Digital cameras save pictures and videos onto some type of removable storage media. The most common removable storage media used in modern digital cameras is the Secure Digital (SD) card, but there are others you might run across as you get into professional cameras. You can find readers designed specifically for SD cards, as well as other types. Plenty of readers can handle multiple media formats. Many computers come with a decent built-in SD card reader.

Answer 18

Cameras in or on computer monitors, often called webcams because their most common use is for internet video communication, enable people to interact over networks with both voice and video. Webcams range greatly in quality and price.

Answer 19

Webcams vary in both image and sound capture quality. Because webcams are mostly used for video chat, they tend to be marketed similar to other video cameras using terms like 720p, HD, and 4K. The most common dedicated webcams today provide 1080p HD resolution experience, with cameras integrated into laptops often being 720p. Those who do a lot of video chatting may prefer to get a good-quality headset with which to speak and listen.

Answer 20

Connect speakers to the 1/8-inch RCA jack on the sound card or on the ports built into the motherboard. Some speaker sets use the USB interface instead. A set of speakers will have anywhere from 2 to 7 individual speakers, all connected to each other somehow. If there are more than two speakers, there is typically a central gathering point (usually a subwoofer) into which the smaller speakers connect. Or if it's just two speakers, speaker 1 connects to the computer and speaker 2 connects to speaker 1.

Answer 21

Headsets without microphones more commonly use 1/8-inch RCA jacks, while headsets with microphones more commonly use USB—although there are many exceptions to that rule.

Answer 22

After physically connecting a headset or speakers, open the Sounds properties (the same as for microphones in the previous section) by right-clicking the speaker icon in the notification area and choosing Open Sound Settings. Then open the Choose Your Output Device drop-down list and select the headset. If the headset also has a microphone, you should also choose the headset as the default input device

Answer 23

Many scanners include a (software) feature called optical character recognition (OCR), which attempts to convert the picture of a scanned document back into text that you can edit with word-processing software. When choosing a scanner, consider four factors: resolution (the number of pixels it can capture), color depth (number of color choices for each pixel, usually at least 32-bit), grayscale depth (number of gray choices for each pixel in black-and-white mode), and scan speed (time it takes to scan a full page). The first three are maximums, and scan speed is fixed based on the other settings. You can adjust settings down for quicker/smaller scans, or adjust them up for maximum detail.

Answer 24

All flatbed scanners, the most common variety of scanner, work the same way. You place a photo or other object face down on the glass (called the platen), close the lid, and then use software to initiate the scan. The scanner runs a bright light along the length of the platen once or more to capture the image.0

Answer 25

Virtual reality (VR) headsets create an immersive experience by mounting two high-resolution screens into a headset that blocks external visual sensory input. They enable the wearer to enter into a 360-degree space that makes it feel like he or she has been transported to another place and time. Current VR headsets use organic light-emitting diode (OLED) technology to power the tiny, high-resolution stereo panels.

USB hubs Flashcards

(49 cards)