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101 · Question #257

On a standalone BIG-IP ASM system, which of the following configuration is valid?

The correct answer is A. Pool named http_pool with 1 pool member, no persistence, and no load balancing method. On a standalone BIG-IP ASM system, a pool with a single member requires no load balancing method or persistence because there is only one destination for all traffic.

Section 3: Load Balancing and High Availability Basics

Question

On a standalone BIG-IP ASM system, which of the following configuration is valid?

Options

  • APool named http_pool with 1 pool member, no persistence, and no load balancing method
  • BPool named http_pool with 3 pool members, cookie persistence, and ratio load balancing method
  • CPool named http_pool with 2 pool members, source IP persistence, and least connections load
  • DPool named http_pool with 3 pool members, cookie persistence, and least connections load

How the community answered

(42 responses)
  • A
    83% (35)
  • B
    5% (2)
  • C
    10% (4)
  • D
    2% (1)

Why each option

On a standalone BIG-IP ASM system, a pool with a single member requires no load balancing method or persistence because there is only one destination for all traffic.

APool named http_pool with 1 pool member, no persistence, and no load balancing methodCorrect

With only one pool member, a load balancing method is unnecessary because there is no traffic to distribute across multiple nodes. Persistence is similarly not required since every session already maps to the same single member, making this the only valid minimal configuration on a standalone ASM system where advanced LTM pool features are not applicable.

BPool named http_pool with 3 pool members, cookie persistence, and ratio load balancing method

Ratio load balancing is an LTM-specific method that requires LTM provisioning and is not supported as a valid standalone BIG-IP ASM pool configuration.

CPool named http_pool with 2 pool members, source IP persistence, and least connections load

Least connections is an LTM-level load balancing method not available in a standalone ASM deployment, making this combination invalid.

DPool named http_pool with 3 pool members, cookie persistence, and least connections load

Combining cookie persistence with least connections load balancing relies on LTM features unavailable on a standalone ASM system, invalidating this configuration.

Concept tested: Standalone BIG-IP ASM single-member pool validity

Source: https://techdocs.f5.com/en-us/bigip-15-1-0/big-ip-asm-getting-started-guide/big-ip-asm-getting-started-guide.html

Topics

#pool configuration#load balancing methods#persistence#BIG-IP ASM

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