Certified Ethical Hacker (CEH) Practice Exam

A Service (SRV) record is designed to define the hostname and port number of servers that provide specific services, such as voice over IP (VoIP) or instant messaging. This allows clients to discover the appropriate servers to connect to for those services without needing to know the specific hostnames or port numbers in advance.

The SRV record includes details like the service's name, protocol, priority, weight, port number, and target hostname. This is crucial for the functioning of services in a networked environment where multiple servers or services can exist, ensuring that clients can locate and utilize the services correctly.

Other options do not accurately describe the purpose of an SRV record. For instance, security measures, operating systems, and data backup schedules are not part of the SRV record's function, as these elements pertain to other facets of server and network management. The primary focus of an SRV record is to facilitate service discovery, making answer B the correct choice.