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mediummultiple choiceObjective-mapped

A company uses digital signatures on all official emails sent to customers. The signature is created using the sender’s private key, allowing recipients to verify that the email truly came from the claimed sender and that it was not altered in transit. Which security goal is primarily achieved by the digital signature?

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A company uses digital signatures on all official emails sent to customers. The signature is created using the sender’s private key, allowing recipients to verify that the email truly came from the claimed sender and that it was not altered in transit. Which security goal is primarily achieved by the digital signature?

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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 ensures data is hidden from unauthorized parties. Digital signatures do not encrypt the message; they only sign it.

B

Distractor review

Integrity

While digital signatures do verify integrity (no tampering), the primary focus of the scenario is preventing the sender from denying the email, which is non-repudiation.

C

Distractor review

Availability

Availability ensures systems and data are accessible when needed. Digital signatures do not contribute to availability.

D

Best answer

Non-repudiation

Non-repudiation provides proof of origin that cannot be denied. A digital signature created with the sender's private key binds the message to the sender, achieving non-repudiation.

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

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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

A company uses a cloud-based SaaS (Software as a Service) application for customer relationship management. According to the shared responsibility model, which security responsibility is primarily handled by the customer?

Question 3

A company runs a mix of on-premises servers and Azure virtual machines. They deploy Microsoft Defender for Endpoint on all servers. The security team wants to create custom queries to hunt for a specific attack pattern that involves a sequence of events across multiple machines, such as a PowerShell script being downloaded and then executed on several servers. They need to write their own detection rules based on advanced hunting data. Which Microsoft 365 Defender capability should they use?

Question 4

A company runs a consumer-facing e-commerce website and wants to allow customers to sign in using their existing social media accounts such as Google, Facebook, or LinkedIn. Which Microsoft Entra ID solution should they implement?

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 — Non-repudiation prevents the sender from denying they sent the message because the digital signature provides cryptographic proof of origin. Digital signatures also provide integrity, but the primary goal in this scenario is non-repudiation (ensuring accountability). Confidentiality is not provided because the email content is not encrypted. Availability is not related.

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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