CompTIA Network+ N10-009 Practice Question

Encryption of data at rest is the most effective measure for ensuring that stored data remains secure from unauthorized access. It transforms the stored data into a secured form that can only be decrypted with a specific key, thereby protecting the confidentiality of the information even if an intruder gains physical access to the storage. Separating data by clearance level, while useful, primarily pertains to data access control rather than securing the data itself. Regular password changes mainly strengthen access controls but do not secure the data if storage is compromised. Implementing strong firewall rules protects against external threats but doesn't secure the data once an attacker bypasses the network defenses.