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CompTIA Linux+ XK0-005 Practice Question

While reviewing the security configurations of a web server, you need to implement a certificate that will secure multiple subdomains under a single domain name. Which type of certificate will provide the most efficient and secure solution?

Wildcard certificate
Public key
Digital signature
Self-signed certificate

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Answer Description

A wildcard certificate is used to secure multiple subdomains of a single domain. This certificate will contain an asterisk (*) in the domain name field, indicating that it can be used for various subdomains. This is the best choice as it saves time and effort when managing certificates for a domain with many subdomains. A self-signed certificate is not signed by a Certificate Authority (CA) and may cause trust issues with clients. A digital signature is a method to ensure the integrity and authenticity of a message but is not specifically used for securing subdomains. A public key is used as part of asymmetric encryption, but on its own, it's not a certificate type and doesn't demonstrate the function described in the question.

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