Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company uses digital signatures to ensure that a sender cannot later deny having sent a message. Which security principle does this primarily address?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Confidentiality
Confidentiality is achieved through encryption, not digital signatures. Digital signatures do not hide the content; they provide authenticity and non-repudiation.
B
Distractor review
Integrity
While digital signatures also provide integrity (detecting tampering), the primary focus of the scenario is preventing denial of sending, which is non-repudiation.
C
Distractor review
Availability
Availability deals with ensuring resources are accessible; digital signatures do not impact availability.
D
Best answer
Non-repudiation
Non-repudiation specifically addresses the inability to deny an action. Digital signatures provide cryptographic proof of origin and consent, ensuring the sender cannot deny sending the message.
Common exam trap
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.
Technical deep dive
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.
Related practice questions
Related SC-900 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
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FAQ
Questions learners often ask
What does this SC-900 question test?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: Non-repudiation — Non-repudiation is the security principle that ensures that a person or entity cannot deny the authenticity of their actions, such as sending a message or performing a transaction. Digital signatures provide non-repudiation by using cryptographic keys to bind the sender's identity to the message, making it verifiable that the sender indeed created the signature and that the message has not been altered. Confidentiality is about keeping data secret. Integrity ensures data has not been tampered with. Availability ensures data and services are accessible when needed.
What should I do if I get this SC-900 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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