FC0-U71 Security Practice Question
Which of the following is a characteristic of a strong password?
⚠ Common exam trap
The trap is fixating on a specific length (like 8 characters) as the hallmark of strength — candidates may overlook that character diversity and overall length together determine resistance to cracking.
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
✓
Contains a combination of uppercase, lowercase, numbers, and symbols
A strong password uses a mix of character types — uppercase, lowercase, numbers, and symbols — to increase entropy and resist brute-force and dictionary attacks. This complexity requirement is a widely accepted characteristic of strong passwords. Length also matters, but among the options, the combination of character classes is the defining characteristic.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Contains a combination of uppercase, lowercase, numbers, and symbols
Why this is correct
Length alone is insufficient; complexity across character classes defeats dictionary and brute-force attacks. Mixing uppercase, lowercase, digits and symbols expands the search space, satisfying the stem's requirement for a strong password characteristic rather than a weak, easily guessed one.
- ✗
Is exactly 8 characters long
Why it's wrong here
Length alone does not make a password strong; eight characters is the typical minimum, not a strength characteristic, and can be brute-forced quickly. Length becomes relevant only combined with complexity and unpredictability, which is what actually resists guessing and cracking attacks.
- ✗
Uses only lowercase letters
Why it's wrong here
Restricting a password to lowercase letters shrinks the character set to 26 symbols, sharply reducing entropy and making brute-force attacks feasible. Mixed case, digits and symbols are required for strength; lowercase-only would suit nothing except perhaps a low-risk, non-sensitive local account.
- ✗
Is the same as the username
Why it's wrong here
A password identical to the username is trivially guessable, since the username is often public or predictable, and it fails uniqueness requirements. Strong passwords must be unrelated to account identifiers; matching the username would only be acceptable where no authentication security is needed at all.
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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.