This object selects how the switch handles IGMP leave messages: fast(1) immediately prunes the multicast stream as soon as a leave is received, while inquisitive(2) instead sends a Group-Specific Query and only prunes the stream if no membership report arrives within the wwpIgmpSnoopInqLeaveTimeout interval. An admin chooses inquisitive(2) to avoid briefly dropping a stream for other remaining members on a shared port when only one host leaves. For example, a switch serving multiple set-top boxes off one port would want inquisitive(2) mode so one box leaving a channel doesn't interrupt the multicast stream for the others still watching on the same port.