Quick Answer
The answer is a next-generation firewall (NGFW) with IPS and application visibility, because it is the only firewall type designed to perform deep packet inspection (DPI) at Layer 7, decode encrypted HTTP/HTTPS payloads, and match traffic against signature-based IPS rules to block exploits like SQL injection. Unlike stateful or proxy firewalls, an NGFW combines application-level awareness with intrusion prevention, allowing it to detect malicious patterns such as ' OR 1=1 -- within the application data stream while maintaining stateful inspection. On the Cisco SCOR 350-701 exam, this concept tests your understanding of how NGFWs differ from traditional firewalls in the context of application-layer security; a common trap is choosing a web application firewall (WAF) alone, but the question specifically asks for a firewall type that also provides IPS and application visibility. Remember the memory tip: “NGFW = DPI + IPS + App-ID” — if it can’t see the app and block the exploit at Layer 7, it’s not the right answer.
This 350-701 practice question tests your understanding of security concepts. 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 type of firewall is best suited to inspect application-layer traffic and protect against exploits like SQL injection?
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.
Stateful firewall
Why wrong: Tracks connections but limited application inspection.
Application proxy firewall
Why wrong: Can inspect, but may lack modern IPS features.
Packet-filtering firewall
Why wrong: Only inspects headers, not payload.
Next-generation firewall with IPS and application visibility
Provides application-layer inspection and protection.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Next-generation firewall with IPS and application visibility
A next-generation firewall (NGFW) with IPS and application visibility is best suited to inspect application-layer traffic and protect against exploits like SQL injection because it combines deep packet inspection (DPI), signature-based IPS, and application-level awareness. Unlike simpler firewalls, an NGFW can decode HTTP/HTTPS payloads, match patterns against SQL injection signatures (e.g., ' OR 1=1 --), and block malicious traffic at Layer 7 while maintaining stateful inspection.
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.
Stateful firewall
Why it's wrong here
Tracks connections but limited application inspection.
Application proxy firewall
Why it's wrong here
Can inspect, but may lack modern IPS features.
Packet-filtering firewall
Why it's wrong here
Only inspects headers, not payload.
Next-generation firewall with IPS and application visibility
Why this is correct
Provides application-layer inspection and protection.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Cisco often tests the misconception that a stateful firewall is sufficient for application-layer threats, but the trap here is that stateful firewalls only inspect up to Layer 4 and cannot detect payload-based exploits like SQL injection, which require Layer 7 inspection and IPS capabilities.
Detailed technical explanation
Under the hood, an NGFW with IPS uses a unified inspection engine that reassembles TCP streams, decodes application protocols (e.g., HTTP, SMTP), and applies a rule set from databases like Snort or Talos to detect SQL injection via regex patterns and anomaly detection. In a real-world scenario, an NGFW can block a SQL injection attempt in an HTTP POST request by matching the payload against a signature like 'SQL Injection - SELECT * FROM' while also allowing legitimate application traffic, something a stateful firewall cannot do.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Security Concepts — study guide chapter
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Security Concepts practice questions
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Cisco SCOR / CCNP Security Core 350-701 study guide
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FAQ
Security Concepts — This question tests Security Concepts — Read the scenario before looking for a memorised answer..
The correct answer is: Next-generation firewall with IPS and application visibility — A next-generation firewall (NGFW) with IPS and application visibility is best suited to inspect application-layer traffic and protect against exploits like SQL injection because it combines deep packet inspection (DPI), signature-based IPS, and application-level awareness. Unlike simpler firewalls, an NGFW can decode HTTP/HTTPS payloads, match patterns against SQL injection signatures (e.g., ' OR 1=1 --), and block malicious traffic at Layer 7 while maintaining stateful inspection.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
This 350-701 practice question is part of Courseiva's free Cisco 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 350-701 exam.
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