220-1201 Exam Preparation Material | CompTIA A+ Certification Exam: Core 1

Explanation:
A cable modem connects to an ISP’s wall jack using a coaxial cable, and the standard connector used for coaxial connections is the F-type connector. According to CompTIA Core 1 (220-1201) networking hardware and cabling objectives, F-type connectors are specifically designed for coaxial cabling used in cable television and cable internet (DOCSIS) installations. These connectors screw onto the coaxial wall outlet and the cable modem, ensuring a secure physical connection and proper signal transmission.
An LC connector is a fiber-optic connector commonly used with single-mode or multimode fiber cables and is not associated with cable modems. An RJ45 connector is used for Ethernet networking and is typically used to connect the cable modem to a router or computer, not to the wall jack. Lightning is a proprietary Apple connector used for charging and data transfer on mobile devices and has no role in network uplinks.
CompTIA expects candidates to clearly distinguish between different cable types and connectors based on the service being installed. When the scenario involves a cable modem and ISP wall jack, the correct and standard connector is the F-type.

Explanation:
Choppy or unintelligible audio is typically caused by issues with the microphone, such as poor quality, hardware defects, or misconfiguration.
Why Not A (Webcam): The webcam handles video, not audio.
Why Not B (Digitizer): A digitizer relates to touchscreens, not audio.
Why Not C (Inverter): Inverters manage power for displays, not audio.
CompTIA A+ Exam
Reference: Core 1 (220-1201), Section 3.6, audio troubleshooting.

Explanation:
Network jitter is variation in the amount of time packets take to reach their destination. Real-time video and audio applications require packets to arrive at relatively consistent intervals.
When jitter becomes excessive, video packets may arrive late or out of sequence. The videoconferencing application may temporarily run out of usable video data, causing the displayed image to freeze. When sufficient packets arrive again, the video resumes.
High bandwidth generally improves the ability to carry video traffic.
Port flapping means a network switch port repeatedly transitions between up and down states. It can cause intermittent connectivity, but a temporary freeze followed by recovery is more directly associated with jitter.
Low latency is desirable because it means packets are delivered with little delay. CompTIA objective 5.5 explicitly identifies jitter as a common network troubleshooting symptom. Cisco also states that network impairments such as jitter, delay, and packet loss can negatively affect videoconferencing quality.

Explanation:
The correct statement when comparing DDR3 and DDR4 memory technologies is that DDR4 offers faster data transfer rates compared to DDR3. According to CompTIA Core 1 (220-1201) memory and hardware objectives, DDR4 was designed as the successor to DDR3 and provides several performance and efficiency improvements.
DDR3 memory typically operates at data transfer rates ranging from 800 MT/s to 2133 MT/s, while DDR4 starts at 2133 MT/s and can scale significantly higher depending on the module and platform. This increased transfer rate allows DDR4 to handle more data per second, improving overall system performance, especially in modern systems and multitasking environments.
Option B is incorrect because DDR4 achieves higher bandwidth, not DDR3.
Option C is incorrect because DDR4 operates at a lower voltage (typically 1.2V) compared to DDR3 (typically 1.5V), making DDR4 more power efficient.
Option D is also incorrect because DDR4 is better suited for low-power environments due to its reduced voltage requirements. CompTIA emphasizes understanding RAM generations, including differences in speed, bandwidth, and power consumption, making DDR4’s higher data transfer rates a key distinguishing factor.

Explanation:
Portable devices such as laptops, small-form-factor computers, and mini-PCs use SODIMM (Small Outline DIMM) memory modules. CompTIA A+ explains that SODIMMs are physically smaller and consume less power than standard DIMMs, making them ideal for mobile systems where space and energy efficiency are critical. Unlike ECC memory, which is primarily used in servers, or RAID which is a storage redundancy methodology rather than a memory type SODIMM is specifically designed for compact computing devices. SATA is a storage interface, not a memory form factor.
The A+ study guide clearly lists SODIMM as the standard laptop memory type because of its compact footprint and compatibility with mobile motherboard layouts. This makes SODIMM the most widely implemented memory technology in portable devices.