Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
A security manager wants to ensure that an employee who sends an email cannot later deny having sent it. Which security concept and associated technology is best suited to achieve this?
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, achieved through encryption
Encryption protects data from unauthorized access but does not prove who sent the data; it addresses confidentiality.
B
Distractor review
Integrity, achieved through hashing
Hashing ensures data has not been altered but does not link the signature uniquely to the sender, so it does not prevent denial of sending.
C
Best answer
Non-repudiation, achieved through digital signatures
Digital signatures provide authentication and integrity, and the sender cannot repudiate the signed data because only they possess their private key.
D
Distractor review
Access control, achieved through permissions
Access control determines who can read or write data but does not provide a mechanism to prove that a specific action occurred.
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.
Question 1
A company must retain all customer contracts for 10 years to comply with industry regulations. After 10 years, the contracts must be permanently deleted. Which Microsoft Purview solution should be used to automate this process?
Question 2
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Question 3
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Question 4
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Question 5
A company has a hybrid identity environment with Active Directory synchronizing to Microsoft Entra ID. They want users to be able to reset their own on-premises passwords via the cloud SSPR portal. What is the minimum license required for this capability?
Question 6
A company uses a cloud-based Customer Relationship Management (CRM) system that is delivered as Software-as-a-Service (SaaS). According to the shared responsibility model, which security responsibility is primarily handled by the customer?
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, achieved through digital signatures — Non-repudiation ensures that a party cannot deny the authenticity of their action, such as sending a message. Digital signatures provide non-repudiation by using a sender's private key to sign the message; the recipient can verify the signature with the sender's public key, proving the sender's identity and that the message was not altered. Encryption protects confidentiality, hashing ensures integrity, and access control manages permissions but does not prevent denial of action.
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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