iRules are event-driven scripts that allow for advanced traffic manipulation.
Universality of Events: Every packet that passes through t 21 he BIG-IP data plane triggers events. Even non-HTTP traffic triggers events such as CLIENT_ACCEPTED (when the TCP connection is established 22 ) or CLIENT_DATA (when raw data is received). Therefore, all client traffic—regardless of protocol—has data that can trigger an iRule event.
Event Specificity: Events are not universal (Option C is false). For example, HTTP_REQUEST only occurs after a full HTTP header is parsed. You cannot trigger an HTTP_RESPONSE event before a request has been sent to a server.
Protocol Agnostic: iRules are not limited to HTTP (Option A is false); they can handle TCP, UDP, DNS, FTP, SIP, and more.
Error Handling: If an iRule references an event that never triggers (e.g., an HTTP_REQUEST event in a purely TCP virtual server), the iRule code for that event simply never executes. It does not terminate the connection (Option D is false).
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