CCNA Tech Concepts and Terminology Questions

3A:4B:5C:6D:7E:8F is valid because a MAC address comprises six octets, each written as two hexadecimal digits separated by colons. Every character here falls within 0–9 or A–F, satisfying the stem's hexadecimal notation requirement, and the total of twelve digits matches the 48-bit hardware address format.

The boot order in BIOS/UEFI determines which device the firmware checks first for bootable media. If the hard drive is listed before the USB drive, the system will boot from the hard drive. Changing the boot order to prioritize the USB drive lets the technician boot the installation media as intended in this scenario.

Clock speed measures frequency in gigahertz, where 3.6 GHz equals 3.6 billion cycles per second. This directly satisfies the stem's request for what the figure indicates, describing the CPU's operating frequency rather than core count or cache size. Each cycle represents one basic processing pulse the processor executes.

This is correct because decimal GB is based on powers of 1000 (1 GB = 1,000,000,000 bytes), whereas binary GiB is based on powers of 1024 (1 GiB = 1,073,741,824 bytes). A drive marketed as 512 GB holds about 512,000,000,000 bytes, which the OS expresses as roughly 476 GiB, explaining the apparent shortfall the customer notices.

A bit is indeed the fundamental unit of digital data, representing a single binary state, either 0 or 1. This is a core concept in computing. The scenario asks for correct statements about bits and bytes, and this accurately describes a bit's definition and possible values.

On-demand self-service allows consumers to provision computing capabilities automatically without requiring human interaction with each service provider. This is a core NIST characteristic of cloud computing, enabling users to quickly access resources as needed. It is essential for scalability and efficiency in cloud environments.

UTF-8 is a variable-width Unicode encoding covering every character in Chinese and Arabic, satisfying the multilingual requirement. Its ASCII-compatible single-byte design for Latin text also keeps storage efficient, unlike fixed-width UTF-32 or legacy code pages that cannot represent both scripts.

JPEG uses lossy compression, discarding perceptually less important colour and frequency data to achieve much smaller file sizes, which is why artefacts appear at high compression. This irreversible data loss distinguishes it from lossless formats such as PNG, GIF, and BMP that preserve every original pixel.

Enabling both bands with separate SSIDs allows older devices to connect to the 2.4 GHz network and newer devices to use the faster, less congested 5 GHz band. This setup maximizes compatibility and performance while reducing interference for devices that can use 5 GHz. It is a common best practice in mixed-device environments.

JPEG applies lossy compression, discarding image detail to shrink file size, which is why artefacts appear at high compression. Lossless formats such as PNG and GIF preserve exact data, making JPEG the correct answer here.

A remote-access VPN creates an encrypted tunnel between the client and the VPN server, protecting data from interception as it crosses untrusted networks like the internet. This confidentiality is a core characteristic of VPNs. In this scenario, it is one of the correct features the colleague should understand when reviewing network security concepts.

An IP address is a logical address assigned to a network interface, allowing devices to send and receive data across local and remote networks. Routers use IP addresses to forward packets between networks. In this scenario, assigning IP addresses to workstations is exactly what enables both local and internet communication.

NVMe SSDs attach directly over the PCIe bus rather than legacy SATA, delivering far higher IOPS and lower latency. That raw throughput directly satisfies the stem's fast boot requirement, while flash memory's lack of moving parts provides the durability sought.

A switch is an intelligent device that learns the MAC addresses of connected devices and forwards frames only out the port where the destination device resides, which segments collision domains and reduces unnecessary traffic. It actively makes forwarding decisions based on its address table, so it belongs in the category of devices that move data between segments rather than merely repeating electrical signals.

Bitwise AND compares each column, outputting 1 only where both bits are 1. Aligning 1101 with 1011: the first, third and fourth columns yield 1, while the second yields 0, giving 1001. This satisfies the stem's requirement for the result of the AND operation.

Bitwise AND compares each column: 1 AND 1 gives 1, 0 AND 1 gives 0, 1 AND 1 gives 1, 0 AND 0 gives 0. Reading the results left to right yields 1010, matching the option exactly.

Dedicated graphics cards interface via PCI Express, the serial expansion bus providing the high bandwidth and power delivery a GPU requires. PCIe x16 slots are the standard motherboard connection, satisfying the requirement to link the new graphics card to the motherboard.

UTF-8 encodes each Unicode code point using one to four bytes, covering virtually all writing systems while remaining ASCII-compatible. Fixed-width schemes such as UTF-32 cannot vary byte count, and legacy single-byte standards lack global language coverage.

In a star topology, each device connects to a central device such as a switch. If one cable fails, only that device loses connectivity, while the rest of the network continues to operate. This matches the scenario's need for fault isolation and a central connection point. Star topologies are easy to troubleshoot and expand, making them ideal for small office networks. The central device becomes a single point of failure, but individual cable failures are contained.

DDR4 RAM is volatile: it holds data only while powered, and its contents are lost on power removal. This matches the stem's requirement for volatile memory, unlike ROM, SSDs or flash, which retain data without power.

A bit is the smallest unit of data, holding a single binary value of 0 or 1. A byte groups exactly 8 bits, forming the standard unit for encoding one character. This precise size relationship is the defining difference the customer needs.