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An email alias is an alternative address associated with a primary mailbox, facilitating categorized management, privacy protection, and unified brand image, suitable for efficient communication for both individuals and businesses.

Load balancing enhances system performance and availability by distributing traffic, supporting high concurrency and scalability scenarios, widely used in web clusters, cloud computing, and microservice architectures.

DNSSEC enhances DNS security through digital signatures, preventing domain spoofing and cache poisoning, ensuring users access genuine websites.

OAuth 2.0 is a widely used open authorization protocol that allows users to authorize third-party applications to access their resources without sharing credentials, ensuring security while enabling flexible authorization.

S/MIME is a public key encryption-based email security protocol that provides encryption, signature, and authentication functions to ensure the security and reliability of email communications.

TLS/SSL is an encryption protocol that ensures network communication security by establishing encrypted channels to achieve data confidentiality, integrity, and authentication, widely used in HTTPS, email, VPN, and other fields.

Two-Factor Authentication (2FA) enhances account security through password plus verification code or biometric authentication, widely used in finance, government services, and other sectors, effectively preventing risks from password leaks.

Virus scanning is a technical method for detecting and removing computer viruses and malicious software, safeguarding system security through signature detection, heuristic analysis, and other methods.

TTL (Time To Live) is a key concept in computer networking and electronic engineering, widely used in network protocols, domain name systems, integrated circuits, and cache management.

CNAME record is a resource record in DNS used to create domain aliases, widely applied in website hosting, CDN acceleration, and third-party service integration, enhancing domain management flexibility and efficiency.