The primary purpose of disk encryption is to protect data from unauthorized access. When data on a disk is encrypted, it is converted into a form that can only be read with the correct decryption key or password, making it inaccessible to unauthorized users. This helps safeguard sensitive information even if the physical disk is lost or stolen.

Authentication is the process of verifying the identity of parties in a communication. In SSL/TLS, it ensures that the client and server are who they claim to be, typically using digital certificates.

The Subject's Name in a digital certificate is what proves the identity of the certificate's subject. It typically contains information about the entity or individual the certificate is issued to, such as their name and organization.

For secure file transfers, SFTP (Secure File Transfer Protocol) operates at the Presentation layer of the OSI model, providing encryption, compression, and data formatting services. In contrast, SCP (Secure Copy Protocol) operates at the Transport layer of the OSI model, providing secure and efficient file transfer over a network.

Organizations may regularly update their cybersecurity procedures to maintain compliance with evolving regulations and standards. Compliance is crucial as non-compliance can lead to legal issues and data breaches. Keeping procedures up-to-date helps an organization adapt to changing legal requirements.

A backup technique that captures every version of a file or database record every time it changes is referred to as "Versioning" backup. This type of backup maintains a history of changes, allowing you to restore a file or record to a specific point in time.

Data Integrity, in encryption, ensures that data remains unchanged from its source and has not been accidentally or maliciously altered. This is vital to ensure the trustworthiness of data in transit or storage.

Packet Filtering Firewalls operate at the network layer and make decisions based on IP addresses and ports.

A Trojan horse (option 1) is a type of malware that disguises itself as a legitimate software or file to trick users into downloading it. Unlike viruses or worms, Trojans typically do not replicate themselves. Once executed, they can provide unauthorized access to the affected computer.

The policy that allows employees to use their personal devices for official work but also emphasizes security measures to protect company data is the BYOD (Bring Your Own Device) policy. This policy outlines guidelines and security measures to ensure that sensitive company information remains secure when accessed on personal devices.