Deck #001 Flashcards
A Desktop computer has recently started exhibiting slow performance, particularly when opening and saving files to the hard drive. What should you try first?
a) Replace the hard drive
b) Remove old files and applications to free up disk space
c) Delete and reinstall the OS
d) Defragment the hard drive
B. Remove old files and applications to free up disk space
Hard drive performance can slow down if the drive gets short on space, particularly under 10 percent of free space. First, try removing old files and applications to free up disk space. If that doesn’t resolve it, then defragment. If neither of those work, you could have a failing hard drive.
Which of the following protocols can be used by a client to access email on a server?
a) DNS
b) FTP
c) SMTP
d) IMAP
D. IMAP
The IMAP and POP3 protocols can be used to retrieve email from mail servers. DNS is used to resolve host names to IP addresses. FTP is for file transfers, and SMTP is used to send email.
Which technology used by e-readers gives them longer battery life than tablets?
a) Lithium-polymer battery
b) Low-power backlight
c) Electrophoretic ink
d) Capacitive touchscreen
C. Electrophoretic ink
E-readers use electrophoretic ink, also known as E Ink. E Ink uses less energy than other LCD displays, prolonging battery life.
Which of the following protocols provide secure network transmissions? (Choose two.)
a) SMTP
b) SNMP
c) SSH
d) HTTPS
C. SSH
D. HTTPS
Secure Shell (SSH) and Hypertext Transfer Protocol Secure (HTTPS) are both secure transport protocols. Simple Network Management Protocol (SNMP) and Simple Mail Transfer Protocol (SMTP) are not inherently secure.
Which of the following video connectors has an analog variety and a digital variety?
a) VGA
b) HDMI
c) DisplayPort
d) DVI
D. DVI
DVI comes in both analog (DVI-A) and digital (DVI-D) varieties. VGA is always analog, HDMI and DisplayPort are always digital.
Which of the following technologies was developed for the IoT and communicates exclusively in the 800 MHz to 900 MHz range?
a) Bluetooth
b) 5G LTE
c) Zigbee
d) Z-Wave
D. Z-Wave
Zigbee and Z-Wave were developed specifically for the Internet of Things (IoT). Zigbee can communicate in the 2.4 GHz range as well as the 800 MHz to 900 MHz range. Z-Wave can communicate only in the 800 MHz to 900 MHz range.
Which of the following protocols can be used in close range to transfer data between a mobile device and a computer system or to allow media to stream from the mobile device to an audio system?
a) SMTP
b) Bluetooth
c) NFC
d) Pegasus
B. Bluetooth
Bluetooth allows you to pair a mobile device to a computer or to a device such as an automotive sound system or headset. Data can be transferred between devices, and media can be streamed from the mobile device. SMTP is an email protocol. NFC is for short-distance data transfers, but not media streaming. Pegasus is not a computer communications protocol.
Which of the following is a physical memory format installed directly in today’s desktop computer systems?
a) DIMM
b) HDD
c) SSD
d) RAM
A. DIMM
DIMMs are a type of memory module. HDD is a hard drive, and SSD is a solid-state drive—both are for permanent long-term storage. RAM is what memory is called, but it is not a physical memory format.
What is the data throughput provided by one ISDN bearer channel?
a) 16 Kbps
b) 56 Kbps
c) 64 Kbps
d) 128 Kbps
C. 64 Kbps
An ISDN B (bearer) channel provides 64 Kbps data throughput. A home-based BRI ISDN provides two B channels.
Which network connectivity device stops broadcasts from being sent to computers on a different network segment?
a) Hub
b) Switch
c) Router
d) Firewall
C. Router
A router does not pass along broadcasts to computers on other segments. Hubs and switches send broadcasts along because they do not segment traffic at the logical network address level.
On which port does FTP run by default?
a) 21
b) 25
c) 53
d) 80
A. 21
FTP operates on ports 20 and 21. Port 25 is used by SMTP, port 53 by DNS, and port 80 by HTTP.
A user says that their keyboard backlight was working but now it’s not. What’s the easiest way to try to get it working again?
a) Change the BIOS setting
b) Use Windows Control Panel
c) Replace the backlight
d) Use the keyboard function key
D. Use the keyboard function key
Most systems with a keyboard backlight have a keyboard function key to turn the backlight on or off—try that first. If not, there is likely a setting in Windows Control Panel, or possibly the BIOS. Replacing the backlight is the last resort.
You are installing a new display for a laptop. Which LCD component is responsible for providing brightness?
a) Backlight
b) Inverter
c) Screen
d) Digitizer
A. Backlight
The backlight provides light to the LCD screen. The inverter provides power to the backlight, and the screen displays the picture. Digitizers take physical input (such as touch) and turn it into electronic data.
Which of the following are standards used by coaxial cable? (Choose two.)
a) RG-6
b) RG-59
c) RJ-11
d) RJ-45
A. RG-6
B. RG-59
RG-6 and RG-59 are coaxial cable standards. RJ-11 and RJ-45 are connectors used with twisted-pair cabling.
You are troubleshooting a network issue. What feature do switches most likely have to help troubleshoot connectivity issues?
a) Port toggles
b) Beep codes
c) Indicator lights
d) Log entries
C. Indicator lights
Switches and other connectivity devices have indicator lights to help indicate when things are working normally and when something isn’t working right. There are no port toggles, and switches don’t use beep codes. A switch might make a log entry into an event logger, but this is less likely than it having indicator lights.
