Domain Name System (DNS)
The predecessor to DNS, a static text file that resides on a computer and is used to resolve DNS host names to IP addresses. The HOSTS file is checked before the machine sends a name resolution request to a DNS name server. The HOSTS file has no extension.
Alternate answers seen on other CBTs
The same question shows up worded slightly differently across CBT versions. Here are the other answer variants we've indexed.
Port 53
Comptia A+ Port Numbers →An attack where an organization's web address is stolen by another party. The other party changes the enrollment of another's domain name without the consent of its legitimate owner.
Comptia Exam Objectives Security+ →Technique used by criminals to alter DNS records and drive users to fake sites, to committing phishing. How - modify the host file on client's device - man in the middle - alter the DNS record on the server to resolve to another IP address
Comptia Sec Plus Objectives →Privacy enhanced mail (PEM)
Comptia Sec+ 601 Exam Objectives →