FC0-U71 Security Practice Question
Which of the following is the strongest password?
⚠ Common exam trap
FC0-U71 often tests the misconception that adding a symbol or number to a common word (like 'P@ssw0rd') makes it strong, when in fact length and randomness are more critical.
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
✓
MyD0g!sF1d0
MyD0g!sF1d0 is the strongest because it is the longest option (11 characters) and combines uppercase, lowercase, digits, and special characters in a non-dictionary phrase. Length is the primary driver of password strength, and this password avoids common words or predictable substitutions like 'P@ssw0rd'. It would take significantly longer to crack via brute force or dictionary attacks than the other options.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
12345678
Why it's wrong here
Very weak, only numbers.
- ✗
P@ssw0rd
Why it's wrong here
Common pattern, short.
- ✓
MyD0g!sF1d0
Why this is correct
MyD0g!sF1d0 combines upper and lower case letters, digits and a symbol across twelve characters, giving far greater brute-force resistance than shorter or single-character-class alternatives. Length plus mixed character classes directly increases the search space an attacker must exhaust.
- ✗
password
Why it's wrong here
A single lowercase dictionary word is guessable within seconds and fails every complexity criterion. It is tempting because it is easy to remember and meets length minimums, and such a password would only be acceptable where a second authentication factor compensates, never as the strongest standalone choice.
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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.