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101 · Question #120

A pool is using Global Availability as its load balancing method (Alternate: Round Robin; Fallback: Return to DNS). The last five resolutions have been C, D, C, D, C . Given the current conditions sho

The correct answer is B. B. Global Availability sends all traffic to the first available member in pool order. If that member becomes unavailable, it moves to the next member in the ordered list.

Section 3: Load Balancing and High Availability Basics

Question

A pool is using Global Availability as its load balancing method (Alternate:

Round Robin; Fallback: Return to DNS). The last five resolutions have been C, D, C, D, C . Given the current conditions shown in the table, which address will be used for the next resolution?

Options

  • AA
  • BB
  • CC
  • DD

How the community answered

(26 responses)
  • A
    31% (8)
  • B
    50% (13)
  • C
    8% (2)
  • D
    12% (3)

Why each option

Global Availability sends all traffic to the first available member in pool order. If that member becomes unavailable, it moves to the next member in the ordered list.

AA

Member A would normally be the first choice under Global Availability, but the current conditions table indicates it is unavailable or not meeting its availability threshold.

BBCorrect

Global Availability always attempts to route all traffic to the highest-priority available member in the pool. Based on the current conditions in the table, member A is unavailable or below its availability threshold, making B the first available member in the pool's priority order. The prior C and D resolutions indicate the alternate Round Robin method was active, but now the preferred method resumes and selects the first available member, which is B.

CC

Member C was used during the Round Robin alternate phase but is not the first available member in the Global Availability priority order.

DD

Member D was also part of the Round Robin alternate rotation but ranks lower in the pool's priority order than B.

Concept tested: F5 GTM Global Availability load balancing ordered member selection

Source: https://techdocs.f5.com/en-us/bigip-14-1-0/big-ip-dns-implementations/configuring-gtm-pool-load-balancing.html

Topics

#Global Availability#Round Robin#Return to DNS#load balancing fallback

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