The DNS record used for service location is:

The DNS record used for service location is:

• A. DNS records
• B. SRV
• C. A
• D. MX

Answer: (B)

Service location in DNS is handled by SRV records. These records are built specifically to locate a service by its type and protocol and to specify exactly how to reach it, including the port and the target host. The SRV record carries information like priority, weight, port, and the hostname to contact, allowing clients to discover the correct endpoint dynamically rather than assuming a fixed port or host. For example, a query for a service such as the LDAP service over TCP would use a name like _ldap._tcp.example.com, and the SRV record would indicate which host provides that service and on which port. This makes SRV ideal for locating services in distributed environments and for enabling simple load balancing and failover through the priority and weight fields. In contrast, A records simply map a hostname to an IP address, and MX records designate mail servers, so they don’t convey service-specific location and port information.

Service location in DNS is handled by SRV records. These records are built specifically to locate a service by its type and protocol and to specify exactly how to reach it, including the port and the target host. The SRV record carries information like priority, weight, port, and the hostname to contact, allowing clients to discover the correct endpoint dynamically rather than assuming a fixed port or host. For example, a query for a service such as the LDAP service over TCP would use a name like _ldap._tcp.example.com, and the SRV record would indicate which host provides that service and on which port. This makes SRV ideal for locating services in distributed environments and for enabling simple load balancing and failover through the priority and weight fields. In contrast, A records simply map a hostname to an IP address, and MX records designate mail servers, so they don’t convey service-specific location and port information.