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101 · Question #200

A site would like to ensure that a given web server's default page is being served correctly prior to sending it client traffic. They assigned the A site would like to ensure that a given web server's

The correct answer is B. The pool member would be marked online (green).. The default F5 HTTP monitor has no receive string configured, so any HTTP response from the server - even unexpected content - is treated as a successful health check.

Section 3: Load Balancing and High Availability Basics

Question

A site would like to ensure that a given web server's default page is being served correctly prior to sending it client traffic. They assigned the A site would like to ensure that a given web server's default page is being served correctly prior to sending it client traffic. They.e assigned the default HTTP monitor to the pool. What would the member status be if it sent an unexpected response to the GET request. default HTTP monitor to the pool. What would the member. status be if it sent an unexpected response to the GET request.

Options

  • AThe pool member would be marked offline (red).
  • BThe pool member would be marked online (green).
  • CThe pool member would be marked unknown (blue).
  • DThe pool member would alternate between red and green.

How the community answered

(65 responses)
  • A
    9% (6)
  • B
    72% (47)
  • C
    15% (10)
  • D
    3% (2)

Why each option

The default F5 HTTP monitor has no receive string configured, so any HTTP response from the server - even unexpected content - is treated as a successful health check.

AThe pool member would be marked offline (red).

A pool member would only go offline (red) if a configured receive string is not found in the server's response or if the server fails to respond at all - neither of which applies when using the default monitor with no receive string.

BThe pool member would be marked online (green).Correct

The default HTTP monitor is configured with a GET request send string but an empty receive string. When no receive string is defined, BIG-IP considers any response from the server a successful probe and marks the pool member online (green). The content of the response is irrelevant because there is no expected string to match against.

CThe pool member would be marked unknown (blue).

Unknown (blue) status indicates a monitor has not yet executed or is in an unconfigured/disabled state, not the outcome of receiving an unexpected HTTP response.

DThe pool member would alternate between red and green.

Monitor results are deterministic within each polling interval; the status does not alternate unless the server intermittently passes and fails the health check across separate probe intervals.

Concept tested: F5 BIG-IP default HTTP monitor receive string behavior

Source: https://techdocs.f5.com/en-us/bigip-15-1-0/big-ip-local-traffic-manager-monitors-reference/http-and-https-monitor-settings.html

Topics

#HTTP monitor#pool member status#GET request#health monitoring

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