The answer is proxy logs with TLS interception and decrypted content, combined with full packet capture. Proxy logs that perform TLS interception reveal the actual decrypted HTTP payloads, allowing an analyst to see exactly what data was transmitted over the encrypted channel, while full packet capture preserves the raw network conversation for deeper inspection of payload content and timing. On the Computer Hacking Forensic Investigator CHFI exam, this scenario tests your understanding of how encrypted outbound traffic can mask exfiltration and why standard firewall logs alone are insufficient—they only show connection metadata, not the content. A common trap is to choose NetFlow or DNS logs, which lack payload visibility, or to forget that without TLS interception, port 443 traffic remains opaque. Remember the mnemonic: “Firewall shows the door, but proxy and packet capture show what walked out.”
CHFI OS and Network Forensics Practice Question
This CHFI practice question tests your understanding of os and network forensics. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.
An analyst is reviewing firewall logs and sees repeated outbound connections from an internal host to a known malicious IP on port 443. Which TWO network forensic data sources would BEST help determine if data exfiltration occurred?
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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Full packet capture (PCAP) of the sessions
Full packet capture provides payload content, and TLS interception logs show decrypted traffic if available.
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.
✗
NetFlow records showing packet sizes and counts
Why it's wrong here
NetFlow lacks payload details.
✓
Full packet capture (PCAP) of the sessions
Why this is correct
PCAPs allow reconstruction of data streams.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
IDS alerts for signatures
Why it's wrong here
IDS alerts may indicate but not provide full payload.
✗
Windows security event logs
Why it's wrong here
Security logs do not contain network payload.
✓
Proxy logs with TLS interception and decrypted content
Why this is correct
Proxy logs with TLS inspection can reveal the actual data in HTTPS sessions.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CHFI question in full detail.
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 CHFI NAT questions on configuration and troubleshooting.
OS and Network Forensics — This question tests OS and Network Forensics — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Full packet capture (PCAP) of the sessions — Full packet capture provides payload content, and TLS interception logs show decrypted traffic if available.
What should I do if I get this CHFI 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 CHFI NAT questions on configuration and troubleshooting.
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?
Static NAT maps one inside address to one outside address.
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