Display Types
Which display technology requires a backlight to create a visible image?
LCD
What type of network connects devices within a small area, such as an office building or school?
LAN — Local Area Network
Which internet connection uses existing telephone lines and becomes less effective as the customer gets farther from the provider's central office?
DSL / ADSL
Which tool is used to permanently attach an RJ45 connector to a twisted-pair Ethernet cable?
Crimper
A firewall rule is blocking TCP 23. A technician can no longer use an older, unencrypted command-line connection to manage a network device. Which protocol is being blocked?
Telnet
Which LCD panel type is known for excellent color accuracy and viewing angles, making it a strong choice for graphics work?
IPS
A Bluetooth headset is connected to a user's smartphone. What type of network is being used?
PAN — Personal Area Network
Which internet connection uses coaxial cable and the DOCSIS standard?
Broadband Cable
A technician needs to locate the other end of an unlabeled Ethernet cable in a closet containing hundreds of cables. Which tool should they use?
Tone generator and inductive probe
A technician needs to allow secure web traffic through a firewall. Which TCP port should be opened?
TCP 443 — HTTPS
Which display technology does not require a backlight because its pixels produce their own light?
OLED
A company connects offices in Philadelphia, New York, and Atlanta. What type of network connects these distant locations?
WAN — Wide Area Network
A technician needs a high-capacity connection that transmits data as light and works well over long distances. Which connection type should be used?
Fiber optic
A technician just made an Ethernet cable and wants to verify that pins 1–8 are connected in the correct order. Which tool should they use?
Cable tester
A firewall is blocking TCP 445. Users suddenly cannot access shared folders and printers on modern Windows systems. Which protocol is being affected?
SMB
An older laptop uses a fluorescent LCD backlight. Which component converts DC power from the laptop into AC power for the backlight?
Inverter
A company uses a separate high-speed network that provides servers with block-level access to centralized storage. What type of network is this?
SAN — Storage Area Network
A rural home cannot get cable or DSL. An outdoor antenna connects the home wirelessly to a local internet provider. What connection type is being used?
WISP
A network cable tests good, but the technician suspects the computer's physical network interface is faulty. Which tool can test the interface by sending transmitted data back into its receive path?
Loopback plug
Users can send email, but changes to their inboxes no longer synchronize between their laptops and phones. Which standard TCP port used by the mailbox-management protocol should the technician investigate?
TCP 143 — IMAP
A laptop screen appears black, but a technician shines a flashlight on it and can faintly see the desktop. What is the most likely area of failure?
Backlight system / inverter on an older fluorescent LCD
A city connects several government buildings using its own fiber network and Metro Ethernet. What type of network best describes this?
MAN — Metropolitan Area Network
A remote office has internet access, but video calls have noticeable delay. During heavy storms, the connection sometimes becomes unreliable. There are no wired providers nearby. Which connection type is the office most likely using, and what explains the two symptoms?
Satellite — latency causes the delay; rain fade causes weather-related signal problems
A technician confirms that an office Wi-Fi network has strong signal strength and is using a channel that does not overlap with nearby wireless networks. Users still experience intermittent connectivity. The technician suspects interference from a non-Wi-Fi device. Which tool should be used next?
Spectrum analyzer
A new laptop connects to the network but cannot automatically receive an IP address. The technician confirms the DHCP server is working. Which two UDP ports should be checked to troubleshoot DHCP communication?
UDP 67 and UDP 68