CompTIA Network+ Practice Test

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What type of record does a DKIM TXT contain?

A unique identifier for email sends
The public key used for verification
DNS settings for the domain
Security credentials for the mail server

The correct answer is: The public key used for verification

A DKIM (DomainKeys Identified Mail) TXT record contains the public key used for verification. This public key is an integral part of the DKIM authentication process, which helps ensure email integrity by allowing the recipient to verify that the email was indeed sent by the domain it claims to be from and that it has not been altered in transit. When an email is sent, a cryptographic signature is created using a private key that corresponds to the public key stored in the DKIM TXT record. The receiving mail server can then look up the public key via DNS to verify the signature. If the public key matches the signature, it confirms that the email was not tampered with and is authentic, thereby enhancing the trustworthiness of email communications. Understanding the role of the DKIM TXT record is crucial for maintaining the security and integrity of email systems, which is why it’s often discussed in the context of email authentication strategies alongside SPF (Sender Policy Framework) and DMARC (Domain-based Message Authentication, Reporting, and Conformance). The other options pertain to different aspects of email and domain configuration but do not accurately describe the purpose of a DKIM TXT record.