This AZ-400 practice question tests your understanding of design and implement a source control strategy. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which TWO Git operations are considered dangerous and should be used with caution because they rewrite history? (Select TWO.)
git fetch
Why wrong: Fetch is a safe operation.
git push --force
Force push can overwrite remote history.
git merge
Why wrong: Merge creates a merge commit, does not rewrite history.
git rebase
Rebase rewrites commit history.
git revert
Why wrong: Revert creates a new commit, does not rewrite history.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
git push --force
Option B is correct because `git push --force` overwrites the remote branch history with the local branch, discarding any commits on the remote that are not in the local history. This can cause other collaborators to lose work if they have based changes on the overwritten commits, making it a history-rewriting operation that must be used with caution.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
git fetch
Why it's wrong here
Fetch is a safe operation.
git push --force
Why this is correct
Force push can overwrite remote history.
Related concept
Read the scenario before looking for a memorised answer.
git merge
Why it's wrong here
Merge creates a merge commit, does not rewrite history.
git rebase
Why this is correct
Rebase rewrites commit history.
Related concept
Read the scenario before looking for a memorised answer.
git revert
Why it's wrong here
Revert creates a new commit, does not rewrite history.
Common exam traps
The trap here is that candidates often confuse `git revert` with `git reset` or think `git merge` rewrites history, but the key distinction is that only operations that change existing commit SHAs (like rebase and force push) are considered history-rewriting and dangerous.
Detailed technical explanation
Under the hood, `git rebase` works by cherry-picking commits from the current branch onto a new base commit, effectively rewriting the commit SHAs and linearizing history. `git push --force` uses the `--force` flag to bypass the default fast-forward check, allowing the remote ref to be updated to any commit, even if it means losing commits. A subtle behavior is that `git push --force-with-lease` is a safer alternative that checks if the remote branch has been updated since your last fetch, preventing accidental overwrites of others' work.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
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FAQ
Design and implement a source control strategy — This question tests Design and implement a source control strategy — Read the scenario before looking for a memorised answer..
The correct answer is: git push --force — Option B is correct because `git push --force` overwrites the remote branch history with the local branch, discarding any commits on the remote that are not in the local history. This can cause other collaborators to lose work if they have based changes on the overwritten commits, making it a history-rewriting operation that must be used with caution.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
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