When configuring a load balancer, which monitor type and field combination is used to monitor HTTP-ECV with a keyword in the Receive String field?

• A. A HTTP-ECV monitor with the keyword in the Special Parameters - Receive String field.
• B. An UDP-ECV monitor with the keyword in the Special Parameters - Receive String field.
• C. A TCP monitor with the keyword in the Special Parameters - Response Codes field.
• D. A HTTP monitor with the keyword in the Special Parameters - Response Codes field.

Answer: (A)

The essential idea is content verification for an HTTP service. HTTP-ECV monitors are designed to fetch the HTTP response and check that a specific piece of content appears in the body. Placing the keyword in the Special Parameters - Receive String field tells the monitor exactly what text to look for in the response. If the response contains that string, the service is considered healthy; if not, it’s deemed unhealthy.

Using a UDP-ECV monitor wouldn’t apply to HTTP payload verification since UDP isn’t the transport for HTTP, and a TCP monitor isn’t set up to search the HTTP body for a keyword. An HTTP monitor uses different mechanisms (such as Response Codes) to validate status codes rather than verifying content with a keyword in the Receive String field.