FC0-U71 Tech Concepts and Terminology Practice Question
Which of the following describes a nibble?
⚠ Common exam trap
FC0-U71 often tests the byte-versus-nibble distinction — candidates who rush may pick 8 bits, forgetting that a nibble is specifically half a byte (4 bits).
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
4 bits
A nibble is defined as 4 bits, which is exactly half of a standard byte (8 bits). It is also equivalent to one hexadecimal digit, since 4 bits can represent 16 distinct values (0–15). This makes the nibble a fundamental unit in low-level computing and hexadecimal notation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
4 bits
Why this is correct
A nibble is precisely 4 bits, exactly half a byte. This directly satisfies the stem's request for the term describing that quantity, since the question asks only for the definition of a nibble rather than any larger unit such as a byte, word or octet.
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8 bits
Why it's wrong here
A nibble is 4 bits, half a byte; 8 bits is a full byte. It tempts because the nibble is defined as half a byte, so candidates confuse the whole with its half, and 8 bits is the familiar grouping seen in octets and ASCII characters.
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16 bits
Why it's wrong here
A nibble is 4 bits, half an octet; 16 bits equals two bytes, which is a word on some architectures. The value 16 is tempting because it is the bit count of a 16-bit word, but that unit is not a nibble.
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2 bytes
Why it's wrong here
Two bytes equal 16 bits, which describes a 16-bit word, not a nibble; a nibble is exactly 4 bits, or half a byte. The pairing tempts because a nibble is half a byte, but doubling that half yields two bytes, not the nibble itself.
About these practice questions
Courseiva writes every FC0-U71 question from scratch — 988 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
This FC0-U71 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the FC0-U71 exam.