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101 · Question #503

HTTP pool attached to a Virtual Server has three members Pool member. - A default HTTP monitor in red - Pool member 6 custom HTTP monitor in green - Pool member C does not monitor Which pool members p

The correct answer is C. Pool members B and C. In F5 BIG-IP, a pool member with a failed (red) monitor is marked down and removed from load balancing, while a member with no monitor is always considered available.

Section 3: Load Balancing and High Availability Basics

Question

HTTP pool attached to a Virtual Server has three members Pool member.

  • A default HTTP monitor in red
  • Pool member 6 custom HTTP monitor in green
  • Pool member C does not monitor

Which pool members participate in the load balancing?

Options

  • APool members A and C
  • BPool members A B and C
  • CPool members B and C
  • DPool members A and B

How the community answered

(63 responses)
  • A
    5% (3)
  • B
    21% (13)
  • C
    65% (41)
  • D
    10% (6)

Why each option

In F5 BIG-IP, a pool member with a failed (red) monitor is marked down and removed from load balancing, while a member with no monitor is always considered available.

APool members A and C

Pool member A has a red (failed) monitor and is marked down, so it is excluded from load balancing despite pool member C being included.

BPool members A B and C

Pool member A cannot participate because its default HTTP monitor is red, indicating the health check is failing and BIG-IP has removed it from the active pool.

CPool members B and CCorrect

Pool member B has a green custom HTTP monitor, meaning it is passing health checks and is active in the load balancing pool. Pool member C has no monitor assigned, so BIG-IP treats it as always up by default and includes it in load balancing. Pool member A has a red (failed) monitor, so BIG-IP marks it down and excludes it from receiving traffic.

DPool members A and B

Pool member C participates because a missing monitor defaults to always-up status, and pool member A is excluded due to its failed red monitor.

Concept tested: F5 BIG-IP pool member health monitor status and load balancing participation

Source: https://techdocs.f5.com/en-us/bigip-16-1-0/big-ip-local-traffic-management-monitors-reference.html

Topics

#pool members#health monitors#member status#load balancing participation

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