- A
They block all incoming SYN packets from suspicious sources.
Why wrong: Blocking is not the mechanism; SYN cookies encode state in the SYN-ACK.
- B
They encode connection state in the SYN-ACK sequence number, allowing the server to avoid storing state until the ACK is received.
This is the correct description of SYN cookies.
- C
They increase the backlog queue size to accommodate more half-open connections.
Why wrong: Increasing backlog may delay exhaustion but doesn't prevent it.
- D
They require clients to solve a computational puzzle before completing the handshake.
Why wrong: That describes a different mitigation technique, not SYN cookies.
Question 96 of 1,000
SSCP Network and Communications Security Practice Question
This SSCP practice question tests your understanding of network and communications security. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. 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 of the following best describes the function of SYN cookies in mitigating SYN flood attacks?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
✓
They encode connection state in the SYN-ACK sequence number, allowing the server to avoid storing state until the ACK is received.
SYN cookies allow the server to avoid allocating resources for half-open connections until the handshake completes, preventing resource exhaustion.
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.
- ✗
They block all incoming SYN packets from suspicious sources.
Why it's wrong here
Blocking is not the mechanism; SYN cookies encode state in the SYN-ACK.
- ✓
They encode connection state in the SYN-ACK sequence number, allowing the server to avoid storing state until the ACK is received.
Why this is correct
This is the correct description of SYN cookies.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
They increase the backlog queue size to accommodate more half-open connections.
Why it's wrong here
Increasing backlog may delay exhaustion but doesn't prevent it.
- ✗
They require clients to solve a computational puzzle before completing the handshake.
Why it's wrong here
That describes a different mitigation technique, not SYN cookies.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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 security analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
Visual reference
What to study next
Got this wrong? Here's your next step.
Identify which SSCP exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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Network and Communications Security — study guide chapter
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FAQ
Questions learners often ask
What does this SSCP question test?
Network and Communications Security — This question tests Network and Communications Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: They encode connection state in the SYN-ACK sequence number, allowing the server to avoid storing state until the ACK is received. — SYN cookies allow the server to avoid allocating resources for half-open connections until the handshake completes, preventing resource exhaustion.
What should I do if I get this SSCP question wrong?
Identify which SSCP exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jul 4, 2026
This SSCP practice question is part of Courseiva's free ISC2 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 SSCP exam.
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