A network security engineer is reviewing security logs and notices an unauthorized device sending authenticated messages that occurred during a previous M2M session. Which basic security service would protect against this type of incident?
- message confidentiality
- access control
- replay protection
- message integrity
Explanation: There are four basic security services performed at the data link layer:
• Access control - prevents unauthorized devices from joining the network
• Message integrity - protects against alteration of data while it is in transit
• Message confidentiality - prevents threat actors from reading the transmitted data
• Replay protection - prevents threat actors from successfully capturing legitimate messages and sending them out on the network at a later time
Exam with this question: IoT Sec 1.1 Fundamentals: IoT Security Final Exam Answers
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