Which of the following DNS record types is used to identify an email server?
A. AAAA
B. CNAME
C. TXT
D. MX
Show Answer
Correct Answer: D
Explanation: MX (Mail Exchange) records specify the mail servers responsible for receiving email on behalf of a domain. AAAA maps a hostname to an IPv6 address, CNAME creates an alias to another hostname, and TXT stores arbitrary text data (often for verification), none of which identify an email server.
Question 16
A user's smartphone frequently disconnects from Wi-Fi networks, particularly in crowded areas like airports and coffee shops. The user also notices that their device shows a lower Wi-Fi signal strength compared to other devices in the same location. Which of the following is likely contributing to the smartphone's Wi-Fi connectivity issues?
A. The smartphone's antenna may be malfunctioning.
B. The smartphone may have an outdated Wi-Fi standard.
C. The smartphone may be experiencing interference from nearby devices.
D. The smartphone's power settings may be affecting performance.
Show Answer
Correct Answer: A
Explanation: Consistently lower reported signal strength than other devices in the same environment points to a hardware issue specific to the phone. A malfunctioning or damaged Wi‑Fi antenna would reduce received signal levels and make the device more prone to disconnects, especially in crowded areas. Interference or outdated standards would typically affect performance or throughput, not uniquely low signal strength on one device.
Question 17
Which of the following is an example of SaaS?
A. Videoconferencing
B. Managed VDI
C. Hosted database
D. Hypervisor
Show Answer
Correct Answer: A
Explanation: Software as a Service (SaaS) delivers complete applications over the internet to end users. Videoconferencing is a classic SaaS example because users access a fully managed application via a browser or client without managing infrastructure or platforms. Managed VDI is typically DaaS, a hosted database is usually considered PaaS/DBaaS, and a hypervisor relates to IaaS or on‑prem infrastructure.
Question 17
Which of the following types of RAM is most likely used in data centers and in high-performance machines?
A. ЕСС
B. Single-channel
C. Unbuffered
D. RDIMM
Show Answer
Correct Answer: D
Explanation: Data centers and high-performance servers typically use Registered DIMMs (RDIMM) because the register/buffer reduces the electrical load on the memory controller, allowing greater capacity, stability, and scalability. ECC is commonly paired with RDIMM but is a feature rather than a DIMM type, while single-channel and unbuffered memory are more typical of consumer systems.
Question 18
A customer's laptop has been randomly shutting down. The laptop charges intermittently, and the screen dims when the laptop is not charging. Which of the following is the most likely cause of the issue?
A. Malware
B. Failed digitizer
C. Faulty battery
D. Damaged power port
Show Answer
Correct Answer: C
Explanation: The symptoms point to a battery that can no longer reliably hold or deliver charge. Random shutdowns commonly occur when a degraded battery suddenly drops voltage. Intermittent charging can happen as a failing battery struggles to accept or retain charge, even if the adapter is connected. Screen dimming when not charging is normal power-saving behavior on battery and does not indicate a display issue. A damaged power port would more consistently prevent charging or power delivery, whereas the described behavior fits a faulty battery best.
Question 18
A consultant is assessing the wireless configurations for a small office. The existing equipment uses WEP encryption and operates on the default channel. The office is in a crowded urban area with many nearby networks. Which of the following is the best way to improve the wireless network performance?
A. Replacing the access point
B. Disabling SSID broadcasting
C. Enabling MAC address filtering
D. Updating the firmware
Show Answer
Correct Answer: A
Explanation: The primary performance issue is likely outdated hardware and standards. An access point using WEP is very old and typically limited to 802.11b/g with poor throughput and interference handling. Replacing the access point allows use of modern standards (e.g., 802.11n/ac/ax), better radios, automatic channel selection, and operation on less congested bands, which significantly improves performance in a crowded urban environment. Disabling SSID broadcast and MAC filtering do not improve performance, and firmware updates rarely overcome fundamental hardware and standards limitations.
Question 19
Which of the following best describes the purpose of a firewall?
A. To connect to Wi-Fi
B. To assign IP addresses
C. To route network packets locally
D. To block unwanted traffic
Show Answer
Correct Answer: D
Explanation: A firewall’s primary purpose is to monitor and control incoming and outgoing network traffic based on security rules, blocking unauthorized or unwanted traffic. Assigning IP addresses is the role of DHCP (B), routing packets locally is done by routers/switches (C), and connecting to Wi‑Fi is handled by wireless access points (A).
Question 19
Following a power outage, a laptop will not turn on. Which of the following should a technician replace first to resolve the issue?
A. The AC adapter
B. The RAM
C. The inverter
D. The battery
Show Answer
Correct Answer: A
Explanation: After a power outage, the most common cause of a laptop not turning on is a failed or damaged external power source. The AC adapter is directly exposed to power surges and is easier and cheaper to replace than internal components. RAM and the inverter would not typically prevent all power-on activity, and while a battery can fail, a laptop should still power on with a working AC adapter. Therefore, replacing the AC adapter first is the correct troubleshooting step.
Question 20
A computer is experiencing random shutdowns. A technician notices that the fans on the computer work but are noisy. The CPU temperature is about 122°F (50°C) when the computer is started but rises to 208°F (98°C) when applications are opened. Which of the following would most likely fix this issue?
A. Replacing the power supply
B. Installing a high-performance heat sink
C. Adjusting the fan settings
D. Adding more RAM to the computer
Show Answer
Correct Answer: B
Explanation: The system is shutting down due to CPU overheating: temperatures climb rapidly from 50°C to 98°C under load, which is near or above thermal shutdown thresholds. Noisy fans indicate they are already spinning at high speed but are unable to dissipate enough heat, pointing to inadequate heat transfer from the CPU. Installing a high-performance heat sink (and properly applying thermal paste) directly improves CPU cooling and resolves the root cause. Replacing the power supply, adjusting fan settings, or adding RAM would not address excessive CPU temperature.
Question 20
A user ran out of USB ports on their laptop but would like to plug in more devices. Which of the following technologies is the best for them to use?
A. Near-field communication
B. Bluetooth
C. USB receiver
D. Port replicator
Show Answer
Correct Answer: D
Explanation: A port replicator (docking station) connects to the laptop via a single port (often USB-C/Thunderbolt) and provides multiple additional USB ports and other connections. NFC and Bluetooth are wireless technologies not intended to expand physical ports, and a USB receiver still consumes a USB port rather than adding more.
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