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201 · Question #310

Which three iRule events are likely to be seen in iRules designed to select a pool for load balancing? (Choose three.)

The correct answer is A. CLIENT_DATA C. HTTP_REQUEST E. CLIENT_ACCEPTED. Pool selection for load balancing typically occurs early in the connection lifecycle or after an HTTP request is fully received.

Section 7: Configure Advanced Features

Question

Which three iRule events are likely to be seen in iRules designed to select a pool for load balancing? (Choose three.)

Options

  • ACLIENT_DATA
  • BSERVER_DATA
  • CHTTP_REQUEST
  • DHTTP_RESPONSE
  • ECLIENT_ACCEPTED
  • FSERVER_SELECTED
  • GSERVER_CONNECTED

How the community answered

(30 responses)
  • A
    80% (24)
  • D
    13% (4)
  • F
    3% (1)
  • G
    3% (1)

Why each option

Pool selection for load balancing typically occurs early in the connection lifecycle or after an HTTP request is fully received.

ACLIENT_DATACorrect

CLIENT_DATA is triggered when client data is received, allowing pool selection based on initial payload content before full application-layer parsing.

BSERVER_DATA

SERVER_DATA occurs when data is received from the backend server, which is too late for initial pool selection.

CHTTP_REQUESTCorrect

HTTP_REQUEST fires after the full HTTP request headers are received, enabling pool selection based on request details like URI, host, or headers.

DHTTP_RESPONSE

HTTP_RESPONSE fires after the server's HTTP response is received, which is too late for initial pool selection.

ECLIENT_ACCEPTEDCorrect

CLIENT_ACCEPTED is triggered immediately upon client TCP connection establishment, permitting pool selection based on connection-level attributes such as source IP or port.

FSERVER_SELECTED

SERVER_SELECTED is triggered after a server from a pool has already been chosen, not as an event to initiate the selection logic itself.

GSERVER_CONNECTED

SERVER_CONNECTED occurs after the connection to the backend server is established, which is too late for initial pool selection.

Concept tested: iRule events for pool selection

Source: https://techdocs.f5.com/en-us/bigip-15-0-0/big-ip-irules-reference/irule-events.html

Topics

#iRule events#pool selection#HTTP_REQUEST#CLIENT_ACCEPTED

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