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SYN,SYN/ACK,ACK PassiveOpen,ActiveOpen,ACK,ACK SYN,ACK/SYN,ACK ActiveOpen/PassiveOpen,ACK,ACK
(SYN=0,ACK=0,seq=11221,ack=11221) (SYN=1,ACK=1,seq=11220,ack=11220) (SYN=1,ACK=1,seq=11221,ack=11221) (SYN=0,ACK=0,seq=11220,ack=11220)
——SYN/ACK——>,<——ACK,——SYN/ACK——> ——SYN/ACK——>,<——SYN/ACK——,——ACK——> ——SYN——>,<——ACK,——SYN——>,<——ACK—— ——SYN——>,<——SYN/ACK——,——ACK——>
ACK SYN/ACK SYN/RST RST/ACK
each antibody attack one particular antigen all the antibodies resist against the disease when activated the antibodies that attack measles, once activated, continue to confer resistance against measles a vaccine can stimulate the production of antibodies