- A
nft insert rule
Why wrong: nft insert rule exists but requires more syntax; add rule is more common for simplest addition.
- B
nft list ruleset
Lists all current rules.
- C
nft add rule inet filter input tcp dport 443 accept
Adds a rule to accept HTTPS.
- D
nft show ruleset
Why wrong: nft show is not a valid command.
- E
nft -a list ruleset
Why wrong: -a adds handles, but not a separate command.
Question 739 of 1,000
XK0-005 Security Practice Question
This XK0-005 practice question tests your understanding of security. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
A Linux administrator is troubleshooting a firewall issue using nftables. The ruleset is complex. Which two commands are useful for listing the current ruleset and adding a new rule? (Choose TWO.)
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
✓
nft list ruleset
Option B is correct because `nft list ruleset` is the standard command to display the entire current nftables ruleset in a human-readable format, which is essential for troubleshooting complex firewall configurations. Option C is correct because `nft add rule inet filter input tcp dport 443 accept` is the proper syntax to append a new rule to the specified chain (here, the 'input' chain of the 'filter' table in the 'inet' family) that accepts TCP traffic on port 443.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
nft insert rule
Why it's wrong here
nft insert rule exists but requires more syntax; add rule is more common for simplest addition.
- ✓
nft list ruleset
Why this is correct
Lists all current rules.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
nft add rule inet filter input tcp dport 443 accept
Why this is correct
Adds a rule to accept HTTPS.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
nft show ruleset
Why it's wrong here
nft show is not a valid command.
- ✗
nft -a list ruleset
Why it's wrong here
-a adds handles, but not a separate command.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse `nft show ruleset` (invalid) with `nft list ruleset` (valid), or think that `nft insert rule` is used for listing rules instead of adding them at a specific position.
Trap categories for this question
Command / output trap
nft show is not a valid command.
Detailed technical explanation
How to think about this question
Under the hood, nftables uses a structured ruleset hierarchy of tables, chains, and rules, and `nft list ruleset` outputs the entire configuration in a format that can be directly reused in a script or saved to a file. The `nft add rule` command appends a rule to the end of a chain by default, while `nft insert rule` places it at a specific position; both are atomic operations that update the kernel's netfilter configuration immediately. In real-world scenarios, administrators often use `nft list ruleset` to verify changes after adding rules, especially when debugging connectivity issues with services like HTTPS on port 443.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the XK0-005 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this XK0-005 question test?
Security — This question tests Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: nft list ruleset — Option B is correct because `nft list ruleset` is the standard command to display the entire current nftables ruleset in a human-readable format, which is essential for troubleshooting complex firewall configurations. Option C is correct because `nft add rule inet filter input tcp dport 443 accept` is the proper syntax to append a new rule to the specified chain (here, the 'input' chain of the 'filter' table in the 'inet' family) that accepts TCP traffic on port 443.
What should I do if I get this XK0-005 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
This XK0-005 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 XK0-005 exam.
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