The answer is cryptographic hashing with chained hashing, as this directly ensures tamper-proof transaction logs by linking each log entry to the previous one through a hash value. In a chained hashing scheme, any alteration to a prior entry changes its hash, breaking the chain for all subsequent entries and making tampering immediately detectable. On the CompTIA SecurityX CAS-004 exam, this concept tests your understanding of integrity controls versus confidentiality or access controls—a common trap is confusing encryption (which protects data at rest or in transit, not integrity) with hashing. Remember that digital signatures also provide integrity but add key management overhead for every entry, while chained hashing is lightweight and self-validating. A useful memory tip: think of a blockchain ledger where each block’s fingerprint contains the previous block’s fingerprint—break one link, and the whole chain screams foul.
CAS-004 Security Engineering Practice Question
This CAS-004 practice question tests your understanding of security engineering. 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 financial institution needs to ensure that transaction logs are tamper-proof after creation. Which solution should be implemented?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Cryptographic hashing with chain hashing
Cryptographic chained hashing (e.g., blockchain) links each log entry to the previous one via a hash, making tampering detectable. Encryption does not protect integrity. ACLs can be bypassed. Digital signatures are effective but more complex to manage for every entry.
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.
✓
Cryptographic hashing with chain hashing
Why this is correct
Chain hashing creates a tamper-evident log by linking entries cryptographically.
Related concept
Static NAT maps one inside address to one outside address.
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Access control lists
Why it's wrong here
ACLs restrict access but do not prevent tampering by authorized users.
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Encryption with AES
Why it's wrong here
Encryption provides confidentiality, not integrity; logs could be tampered with while encrypted.
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Digital signatures on each log entry
Why it's wrong here
Digital signatures are valid but require key management for each entry; chain hashing is more efficient for logs.
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 Engineering — This question tests Security Engineering — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Cryptographic hashing with chain hashing — Cryptographic chained hashing (e.g., blockchain) links each log entry to the previous one via a hash, making tampering detectable. Encryption does not protect integrity. ACLs can be bypassed. Digital signatures are effective but more complex to manage for every entry.
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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Question Discussion
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