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101 · Question #93

Which is the result when multiple monitors are assigned to a pool member?

The correct answer is A. The member is marked available if sufficient monitors succeed, and as unavailable if insufficient. BIG-IP LTM uses a configurable minimum monitor threshold to determine pool member availability when multiple monitors are assigned, marking the member available or unavailable based on how many monitors succeed.

Section 3: Load Balancing and High Availability Basics

Question

Which is the result when multiple monitors are assigned to a pool member?

Options

  • AThe member is marked available if sufficient monitors succeed, and as unavailable if insufficient
  • BThe member is marked as available if any of the monitors succeed.
  • CThe member is marked as unavailable if any of the monitors fails.
  • DThe member is marked available if all monitors succeed, and as marginal if one or more monitors

How the community answered

(55 responses)
  • A
    95% (52)
  • B
    2% (1)
  • C
    4% (2)

Why each option

BIG-IP LTM uses a configurable minimum monitor threshold to determine pool member availability when multiple monitors are assigned, marking the member available or unavailable based on how many monitors succeed.

AThe member is marked available if sufficient monitors succeed, and as unavailable if insufficientCorrect

BIG-IP LTM allows configuring a 'minimum' setting on pool monitors that specifies how many monitors must report success before a member is considered available. If the number of successful monitors meets or exceeds this minimum, the member is marked available; if fewer than the minimum succeed, the member is marked unavailable.

BThe member is marked as available if any of the monitors succeed.

This describes behavior only when the minimum monitor threshold is set to 1, which is not the general multi-monitor behavior that allows configurable success thresholds.

CThe member is marked as unavailable if any of the monitors fails.

This describes an overly strict 'any failure equals down' policy that ignores the configurable minimum threshold BIG-IP uses when multiple monitors are assigned.

DThe member is marked available if all monitors succeed, and as marginal if one or more monitors

While 'marginal' is a valid BIG-IP health state, this answer incorrectly implies all monitors must succeed for availability, contradicting the configurable minimum threshold behavior that A correctly describes.

Concept tested: BIG-IP LTM multiple monitor minimum threshold

Source: https://techdocs.f5.com/en-us/bigip-16-0-0/big-ip-local-traffic-manager-monitors-reference/monitoring-an-ip-network.html

Topics

#health monitors#pool member availability#monitor thresholds#multiple monitors

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