. ▁On ▁August ▁ 2 2 , ▁ 2 0 1 3 ▁the ▁NY SE ▁Ar ca ▁system ▁sent ▁multiple ▁sequences ▁to ▁Nas da q ▁which ▁consum ed ▁a ▁large ▁amount ▁of ▁the ▁system ’ s ▁capacity . ▁The ▁S IP ▁then ▁received ▁quote ▁for ▁in ac cur ate ▁symbols , ▁the ▁few ▁characters ▁which ▁are ▁used ▁to ▁represent ▁a ▁security ▁on ▁an ▁exchange , ▁from ▁NY SE ▁Ar ca . ▁This ▁resulted ▁in ▁the ▁S IP ▁generating ▁a ▁numerous ▁quote ▁reject s ▁which ▁further ▁absor bed ▁capacity ▁of ▁the ▁S IP . ▁Every ▁connect ▁and ▁dis connect ▁sequence ▁sent ▁by ▁NY SE ▁Ar ca ▁to ▁the ▁S IP ▁resulted ▁in ▁over ▁ 2 6 0 0 0 ▁updates , ▁per ▁port ▁per ▁second . ▁This ▁enorm ously ▁over wh el med ▁the ▁Nas da q ▁S IP ▁and ▁resulted ▁in ▁a ▁system ▁shut ▁down ▁to ▁ensure ▁fair ness ▁in ▁the ▁market ▁and ▁prevent ▁further ▁over loading . ▁Nas da q ▁stated ▁that ▁the ▁volume ▁of ▁activity , ▁per ▁port , ▁per ▁second , ▁at ▁the ▁time ▁of ▁the ▁free ze , ▁was ▁ 2 6 ▁times ▁that ▁of ▁a ▁usual ▁trad ing ▁day . ▁ ▁NAS DA Q ▁Response ▁ ▁On ▁August ▁ 2 2 , ▁ 2 0 1 3 , ▁NAS DA Q ▁O M X ▁released ▁a ▁brief ▁statement ▁cit ing ▁a ▁connect ivity ▁issue ▁between ▁an ▁exchange ▁particip ant ▁and ▁the ▁S IP ▁as ▁the ▁catal yst ▁for ▁the ▁in ability ▁to ▁dist ribute ▁quotes . ▁The ▁"