Network Defense Essentials (NDE) Practice Exam 2025 - Free Network Defense Practice Questions and Study Guide

Data encryption is an essential security measure that protects the confidentiality and integrity of email communications. When emails are encrypted, the content is transformed into a coded format that can only be deciphered by someone who possesses the appropriate decryption key. This ensures that even if an unauthorized party intercepts the email during transmission, they would not be able to read or manipulate the information without the key.

Email spooling, while it pertains to the temporary storage of emails during transmission, does not provide any protection against interception. It could be vulnerable to unauthorized access if proper security measures are not in place.

Email filtering focuses on managing incoming and outgoing emails, primarily for spam or malicious content detection. This can help in reducing the likelihood of phishing attacks or malware but does not specifically protect email data from being intercepted.

Network segmentation involves dividing a computer network into smaller parts to improve performance and security. While it enhances overall security by restricting access between different parts of a network, it does not directly address the issue of preventing interception of emails in transit.

In summary, data encryption is the most effective method listed for preventing data interception in emails, ensuring that sensitive information remains confidential throughout transmission.