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                                                      !                        "                 #      "     $"         %  "    "  &                  '%%     (      #  '%%     )  %  "        "  %       "              '          *& '''+,*+- .      '%            "         "  "       ./            %       #             01'%%'    '    21 01             '%%   3  21            #           '%%  01   (    01#  21     /  /                "  4 - ."          '%%01,**5-  21"          21   67%' - ."          *&358%  9:;%' - ."          *&5%%58%  9<;%' $      &                  $"      '                  '%%'    "           '%%'    '%/"    #   *  #"        '           "        111#          "   '  "       ="    '  #        %>    '    /  *+          ?    '    *+    /     4 - 1114@A;/%' - B%%4C977/%' - %D,6*?E'-466;6/%' - %D,C;*?E'-4C:AC6/%'  !"!#$ca ́ ch thư ́ c truyê ̀ n cu ̉ a đoa ̣ n phân ma ̉ nh %&'  (     ) (*  $#  >>''%#%@77<#  (  F''    =%> * '& + (  )$,+,-! .  /0&0120340& !& 4.    /0'56  70/& 8& =    G%C  H%IGG'%  G%   %& )  9   /0  &=    G%    H%IGG'%       &'#  /   :& =    2123    G% ;& 4.    /0';& <& =    H%H/    7"        G%     =& >  0& %&!  9      ?  /    "  2101+3120*1    (  "  /  #         ,%>-#    '%                /   '%  '    @%'      /    "     J  %       12=)%#      H1% ?    "    /  '%           01E21K    /             +9       #  /  L>'5%#%@77<=%>*"         /    (  "  1  @'#    H15%''  @' M  1#  H1"       #    '#%  G%' &#  G & 0     =%>*'%    #  G%' #  G  ?        G%N#   =%  ('  #       ?          G%'0F1#  =%> *#  ('    (    G%'  /      %&!&'?@A)4    5      %#  G%%&      01E21%%(       '%''  /    '    #             ) (*  $/  #  L>'5%#%@77<#  (  F#     =%>* '& 4.  1 .  /&B&/ C* 0)$,+,-! ?  ( '  "  /   !& D  /(  .  & 8& )C  1203405 .  /&       04O'OM%''@ %& P'  G%C    B%%/'    &      "  21  /    "   *F0    :& P'  G%@  %      #      (  "         @'        #   ;& P'  @G%'  % 0        20*1%  (    @'   G%%& E  0    A)45 6    /08 % "  /   <& P'  #            '%''                 K"        20*1%%(%'#  %'    20*1%% =& >  & &B&     #    "  5%''  "     #        '      '    /     (  "    H1 0  '%  ('    H1  '%''             '    /      H1    #  /     %&!&!+0C 97+ ?    '%      H1'%''     0  @  H1           (    #/   @  H1               #  /     Q          "  #  H1  H1     H1       %          H1'%#% 0%    C7@6,       N-      #  '%#%#    @C#  H1#  '%''        5%#%      /            /  @7 0%'%             #  /    'NRC H1/    %      @(  "        %#  '%#% . H1%/      H1'%''%  @,    C7@6CN#NRC- P  "      #  '%''  '%#%#   @C  '%#% 5  '%#%  ,  C7@6    S '%''  -#        % 5  %%(%'       #  %#  NRC(S  '%#% .H1        "    G%>            H1'%''  %#  '%#%    #    "  '%#%       %    G%>"  G%>'%          '%''  /                   #     H1/          (  #        G%>  @    H1'%''   /      H1%#    '%''  /          /    0    #      #  H1/    #        #  G%>   #    "  '%#%    ?  #"  H1%/      @'%''H1'%#%         %C/    "              #          !      #  "      /        H1/    "       C    '%#%  %  '     %&!&8F    9    7+   & 3  %#    G%%&        01E21%%                 #         ) (*  $/  #  L>5%#%@77<#  (F'=%#  =%>* '& )C  1 .  /&B&H%    04O'OM%''@ ?     ('    (  /      !& P'      '%''  G'%#%  ''>'%  ''     "   8& )C  1203405 .  /&0)$,+,-!&?  '%       (    "  /   ,      #  /    =%>*   /  '      "  *F0#  21          Q%&#                 - Đây la ̀ 51 frame liên quan đê ́ n capture na ̀ y. %& =  /            H1"  '%GC"H)05 3  9  (    7+I(   F309  B9  J       9   3KE&=  /        '%        G%%& :& P'  G%'<6#  9  (  "  /  //         '%'' =  G%'    &    ,;TUACCUC@C6C;UCA@<@A<CU<6<T66 6;U6:-    (        H1    H1%(%'   G%        (  "    #       ;& P'  G%T/      "      '%     <& P'  G%A/          ''> =& P'  G%CC/        ''>     %/  "                   #      /          V L&   CB6  0 J*  CJJ.  6 J   H%</    (  "  /  //  F#%I%/    '      5S=/ C     @7@9,7:BAQ%&-        %(%'   @C,C9Q%&-'%#% *  '  '%(%%/%@79@<;7CC@,:F96T:?7 [...]... frame này để đinh nghia cho nó, thâ ̣m chí trong môi trường ̣ ̃ multiple session giữa 2 host giố ng nhau 10 Quan sát mô ̣t reply Reply từ FTP server trong frame 4 bao gồ m mô ̣t ACK, trong khi đó đồ ng thời bao gồ m mô ̣t SYN Đây là Passive Open 11 Quan sát frame 5 bao gồ m mô ̣t ACK từ client Khi mô ̣t session đươ ̣c thành lâ ̣p, FTP có thể tiế p tu ̣c với qua trinh cài đă... ̣c chứng thực lúc cài đă ̣t, ba ̣n có thể nhin thấ y password dưới da ̣ng ̀ plaintext 15 Quan sát mô ̣t capture của user đã đươ ̣c chứng thực, FTP session đươ ̣c cho phép để tiế p tu ̣c FTP server san sàng đã san sàng nhâ ̣n gói tin như trong frame 12 ̃ ̃ 16 Quan sát phầ n còn la ̣i là các FTP frame 14, 16-19, 23, 29, 31- 34, 38 và 44 phải làm với danh sách thư mu ̣c và... Quit ̣ ̣ ̀ command 19 Quan sát trong frame 47, ban có thế thấ y server giao tiế p với client với tin nhắ n “See ya ̣ later” 20 Quan sát những tin nhắ n đươ ̣c theo sau bởi TCP chấ m dứt session từ cả 2 đầ u trong frames 48 và 49, 50 và 51, khi mà bit FIN đươ ̣c bâ ̣t lên 1 và frame tương ứng chứa bit ACK bâ ̣t lên 1 21 Đóng Network Monitor Nế u có nhắ c nhở save thì click . %D,C;*?E'-4C:AC6/%'  !"!#$ca ́ ch thư ́ c truyê ̀ n cu ̉ a đoa ̣ n phân ma ̉ nh %&'  (     ) (*  $#

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