A BIG-IP Administrator assigns thedefault HTTP health monitorto a pool that has three members listening...

In BIG-IP LTM,health monitorsare used to determine the availability of pool members and directly influence traffic flow decisions in the data plane.

Key characteristics of thedefault HTTP monitoraccording to BIG-IP Administration Data Plane Concepts:

Sends an HTTP request (typically GET /)

Expects an HTTP response code of200 OK

Any responseother than 200is treated as amonitor failure

A failed monitor causes the pool member to be markedoffline (down)

In this scenario:

Two pool members return404 Not Found

A 404 response indicates that the requested object was not found

This doesnotmeet the success criteria of the default HTTP monitor

These two members are therefore markedoffline

One pool member returns200 OK

This matches the expected response

The member is markedonline

Resulting Pool Member Availability:

2 members: Offline

1 member: Online

Why the Other Options Are Incorrect:

B– 404 responses are not considered healthy by the default HTTP monitor

C– At least one member responds with the expected 200 OK

D– Members returning 404 responses fail the monitor and cannot be marked online

Key Data Plane Concept Reinforced:

BIG-IP health monitors makebinary availability decisionsbased strictly on configured success criteria. For HTTP monitors, response codes matter—404 is a failure, even if the service is technically reachable.

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