The correct immediate response to directory traversal attacks is to block the source IP address at the firewall and check for successful exploitation. Blocking the IP at the firewall halts further malicious requests, such as those targeting ‘/../../../etc/shadow’, by cutting off the attacker’s access at the network perimeter. Simultaneously, checking logs and file integrity for signs of successful exploitation determines whether sensitive files were read or exfiltrated, which is critical for containment and evidence preservation. On the CompTIA SecurityX CAS-004 exam, this scenario tests your ability to prioritize containment over disruption—common traps include jumping to rebuild the server or disabling the web server entirely, which are premature without investigation. Remember the memory tip: “Block first, then check the breach” to avoid overreacting or under-responding to path traversal attempts.
CAS-004 Security Operations Practice Question
This CAS-004 practice question tests your understanding of security operations. 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.
A security analyst is reviewing web server logs and notices repeated requests to URLs containing sequences like '/../../../etc/shadow' and '/../../../etc/passwd'. Which TWO actions should the analyst take as part of the immediate incident response process?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Check for successful exploitation by reviewing file access logs
The correct actions are A and D. Blocking the source IP at the firewall (A) helps prevent further exploitation attempts. Checking for successful exploitation (D) is critical to determine if any files were accessed or exfiltrated. Running antivirus (B) is not directly relevant to a directory traversal attack. Rebuilding the server from a known good state (C) is premature without investigation. Disabling the web server (E) is too disruptive and unnecessary if the threat is contained.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Check for successful exploitation by reviewing file access logs
Why this is correct
Determines if sensitive files were actually accessed.
Related concept
Static NAT maps one inside address to one outside address.
✓
Block the source IP address at the firewall
Why this is correct
Prevents further exploitation attempts from the same source.
Related concept
Static NAT maps one inside address to one outside address.
✗
Run a full antivirus scan on the web server
Why it's wrong here
Not relevant; this is a web application attack, not malware.
✗
Rebuild the web server from a known good backup
Why it's wrong here
Premature; need to assess impact first.
✗
Disable the web server until a patch is applied
Why it's wrong here
Too drastic; immediate blocking of the source is sufficient.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
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
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CAS-004 NAT questions on configuration and troubleshooting.
Security Operations — This question tests Security Operations — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Check for successful exploitation by reviewing file access logs — The correct actions are A and D. Blocking the source IP at the firewall (A) helps prevent further exploitation attempts. Checking for successful exploitation (D) is critical to determine if any files were accessed or exfiltrated. Running antivirus (B) is not directly relevant to a directory traversal attack. Rebuilding the server from a known good state (C) is premature without investigation. Disabling the web server (E) is too disruptive and unnecessary if the threat is contained.
What should I do if I get this CAS-004 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CAS-004 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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