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201 · Question #290

The ICMP monitor has been assigned to all nodes. In addition, all pools have been assigned custom monitors. The pool is marked available. If a pool is marked available (green) which situation is…

The correct answer is D. Over 25% of the pool members have had their content updated and it no longer matches the receive. A pool can be marked available even if some members fail their custom monitors, provided enough members remain functional to meet the pool's availability threshold.

Section 2: Configure Load Balancing Features

Question

The ICMP monitor has been assigned to all nodes. In addition, all pools have been assigned custom monitors. The pool is marked available. If a pool is marked available (green) which situation is sufficient to cause this?

Options

  • AAll of the pool member nodes are responding to the ICMP monitor as expected.
  • BLess than 50% of the pool member nodes responded to the ICMP echo request.
  • CAll of the members of the pool have had their content updated recently and their responses no longer
  • DOver 25% of the pool members have had their content updated and it no longer matches the receive

How the community answered

(24 responses)
  • A
    8% (2)
  • B
    17% (4)
  • C
    4% (1)
  • D
    71% (17)

Why each option

A pool can be marked available even if some members fail their custom monitors, provided enough members remain functional to meet the pool's availability threshold.

AAll of the pool member nodes are responding to the ICMP monitor as expected.

Node-level ICMP monitor success does not guarantee pool availability, as pool availability relies on custom pool member monitors that check application-specific health.

BLess than 50% of the pool member nodes responded to the ICMP echo request.

If less than 50% of nodes respond to ICMP, it typically means a majority of underlying servers are down, making the pool unavailable.

CAll of the members of the pool have had their content updated recently and their responses no longer

If all members' content no longer matches the receive string, all custom monitors would fail, marking the pool unavailable.

DOver 25% of the pool members have had their content updated and it no longer matches the receiveCorrect

If over 25% of pool members fail their custom monitors, it implies that up to 74% of members are still passing, which is often sufficient for a pool to be considered available based on common minimum availability thresholds (e.g., at least one member up or a percentage below the failure rate).

Concept tested: Pool availability based on custom monitor success thresholds

Source: https://support.f5.com/csp/article/K13349

Topics

#health monitors#pool availability#monitor thresholds#ICMP monitor

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