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1.1 ! root 1: \catcode`@=11 ! 2: \expandafter\ifx\csname graph\endcsname\relax \alloc@4\box\chardef\insc@unt\graph\fi ! 3: \catcode`@=12 ! 4: \setbox\graph=\vtop{% ! 5: \baselineskip=0pt \lineskip=0pt \lineskiplimit=0pt ! 6: \vbox to0pt{\hbox{% ! 7: \special{pn 8}% ! 8: \special{pn 20}% ! 9: \special{pa 0 754}% ! 10: \special{pa 0 0}% ! 11: \special{pa 1750 0}% ! 12: \special{pa 1750 754}% ! 13: \special{pa 0 754}% ! 14: \special{fp}% ! 15: \rlap{\kern 0.875in\lower 0.320in\hbox to 0pt{\hss {USER}\hss}}% ! 16: \rlap{\kern 0.875in\lower 0.486in\hbox to 0pt{\hss \hss}}% ! 17: \rlap{\kern 0.875in\lower 0.350in\hbox to 0pt{\hss \hss}}% ! 18: \rlap{\kern 0.875in\lower 0.516in\hbox to 0pt{\hss {PROGRAMS}\hss}}% ! 19: \special{pa 0 1508}% ! 20: \special{pa 0 754}% ! 21: \special{pa 1750 754}% ! 22: \special{pa 1750 1508}% ! 23: \special{pa 0 1508}% ! 24: \special{fp}% ! 25: \rlap{\kern 0.875in\lower 1.074in\hbox to 0pt{\hss {LAYER 7}\hss}}% ! 26: \rlap{\kern 0.875in\lower 1.240in\hbox to 0pt{\hss \hss}}% ! 27: \rlap{\kern 0.875in\lower 1.104in\hbox to 0pt{\hss \hss}}% ! 28: \rlap{\kern 0.875in\lower 1.270in\hbox to 0pt{\hss {APPLICATION}\hss}}% ! 29: \special{pa 0 2262}% ! 30: \special{pa 0 1508}% ! 31: \special{pa 1750 1508}% ! 32: \special{pa 1750 2262}% ! 33: \special{pa 0 2262}% ! 34: \special{fp}% ! 35: \rlap{\kern 0.875in\lower 1.828in\hbox to 0pt{\hss {LAYER 6}\hss}}% ! 36: \rlap{\kern 0.875in\lower 1.994in\hbox to 0pt{\hss \hss}}% ! 37: \rlap{\kern 0.875in\lower 1.858in\hbox to 0pt{\hss \hss}}% ! 38: \rlap{\kern 0.875in\lower 2.024in\hbox to 0pt{\hss {PRESENTATION}\hss}}% ! 39: \special{pa 0 3016}% ! 40: \special{pa 0 2262}% ! 41: \special{pa 1750 2262}% ! 42: \special{pa 1750 3016}% ! 43: \special{pa 0 3016}% ! 44: \special{fp}% ! 45: \rlap{\kern 0.875in\lower 2.582in\hbox to 0pt{\hss {LAYER 5}\hss}}% ! 46: \rlap{\kern 0.875in\lower 2.748in\hbox to 0pt{\hss \hss}}% ! 47: \rlap{\kern 0.875in\lower 2.612in\hbox to 0pt{\hss \hss}}% ! 48: \rlap{\kern 0.875in\lower 2.778in\hbox to 0pt{\hss {SESSION}\hss}}% ! 49: \special{pa 0 3770}% ! 50: \special{pa 0 3016}% ! 51: \special{pa 1750 3016}% ! 52: \special{pa 1750 3770}% ! 53: \special{pa 0 3770}% ! 54: \special{fp}% ! 55: \special{sh}% ! 56: \special{pa 0 3256}% ! 57: \special{pa 0 3016}% ! 58: \special{pa 1250 3016}% ! 59: \special{pa 1250 3256}% ! 60: \special{pa 0 3256}% ! 61: \special{fp}% ! 62: \rlap{\kern 0.625in\lower 3.199in\hbox to 0pt{\hss {MAGIC-BOX}\hss}}% ! 63: \rlap{\kern 0.625in\lower 3.365in\hbox to 0pt{\hss \hss}}% ! 64: \rlap{\kern 0.875in\lower 3.454in\hbox to 0pt{\hss {LAYER 4}\hss}}% ! 65: \rlap{\kern 0.875in\lower 3.620in\hbox to 0pt{\hss \hss}}% ! 66: \rlap{\kern 0.875in\lower 3.484in\hbox to 0pt{\hss \hss}}% ! 67: \rlap{\kern 0.875in\lower 3.650in\hbox to 0pt{\hss TRANSPORT\hss}}% ! 68: \special{pa 0 3016}% ! 69: \special{pa 0 3770}% ! 70: \special{fp}% ! 71: \special{pa 0 3021}% ! 72: \special{pa 875 3021}% ! 73: \special{fp}% ! 74: \special{pa 0 4524}% ! 75: \special{pa 0 3770}% ! 76: \special{pa 1750 3770}% ! 77: \special{pa 1750 4524}% ! 78: \special{pa 0 4524}% ! 79: \special{fp}% ! 80: \rlap{\kern 0.875in\lower 4.090in\hbox to 0pt{\hss {LAYER 3}\hss}}% ! 81: \rlap{\kern 0.875in\lower 4.256in\hbox to 0pt{\hss \hss}}% ! 82: \rlap{\kern 0.875in\lower 4.120in\hbox to 0pt{\hss \hss}}% ! 83: \rlap{\kern 0.875in\lower 4.286in\hbox to 0pt{\hss {NETWORK}\hss}}% ! 84: \special{pa 0 5278}% ! 85: \special{pa 0 4524}% ! 86: \special{pa 1750 4524}% ! 87: \special{pa 1750 5278}% ! 88: \special{pa 0 5278}% ! 89: \special{fp}% ! 90: \rlap{\kern 0.875in\lower 4.844in\hbox to 0pt{\hss {LAYER 2}\hss}}% ! 91: \rlap{\kern 0.875in\lower 5.010in\hbox to 0pt{\hss \hss}}% ! 92: \rlap{\kern 0.875in\lower 4.874in\hbox to 0pt{\hss \hss}}% ! 93: \rlap{\kern 0.875in\lower 5.040in\hbox to 0pt{\hss {DATA LINK}\hss}}% ! 94: \special{pa 0 6032}% ! 95: \special{pa 0 5278}% ! 96: \special{pa 1750 5278}% ! 97: \special{pa 1750 6032}% ! 98: \special{pa 0 6032}% ! 99: \special{fp}% ! 100: \rlap{\kern 0.875in\lower 5.598in\hbox to 0pt{\hss {LAYER 1}\hss}}% ! 101: \rlap{\kern 0.875in\lower 5.764in\hbox to 0pt{\hss \hss}}% ! 102: \rlap{\kern 0.875in\lower 5.628in\hbox to 0pt{\hss \hss}}% ! 103: \rlap{\kern 0.875in\lower 5.794in\hbox to 0pt{\hss {PHYSICAL}\hss}}% ! 104: \rlap{\kern 5.250in\lower 1.543in\hbox to 0pt{\hss \hbox to 6.0in{$\circ\ $ NETWORK LAYER (OR BELOW):\hfil}\hss}}% ! 105: \rlap{\kern 5.250in\lower 1.709in\hbox to 0pt{\hss \hss}}% ! 106: \rlap{\kern 5.250in\lower 1.793in\hbox to 0pt{\hss \hbox to 6.0in{\hphantom{$\circ\ \ $\ I} RE--INVENTS TCP\hfil}\hss}}% ! 107: \rlap{\kern 5.250in\lower 1.959in\hbox to 0pt{\hss \hss}}% ! 108: \rlap{\kern 5.250in\lower 2.043in\hbox to 0pt{\hss \hbox to 6.0in{\hphantom{$\circ\ \ $\ I} PREVENTS USE OF BOARD--LEVEL PRODUCTS\hfil}\hss}}% ! 109: \rlap{\kern 5.250in\lower 2.209in\hbox to 0pt{\hss \hss}}% ! 110: \rlap{\kern 5.250in\lower 2.593in\hbox to 0pt{\hss \hbox to 6.0in{$\circ\ $ SESSION LAYER (OR ABOVE):\hfil}\hss}}% ! 111: \rlap{\kern 5.250in\lower 2.759in\hbox to 0pt{\hss \hss}}% ! 112: \rlap{\kern 5.250in\lower 2.843in\hbox to 0pt{\hss \hbox to 6.0in{\hphantom{$\circ\ \ $\ I} TOO MUCH DEPENDENCY ON TCP AND THE\hfil}\hss}}% ! 113: \rlap{\kern 5.250in\lower 3.009in\hbox to 0pt{\hss \hss}}% ! 114: \rlap{\kern 5.250in\lower 3.093in\hbox to 0pt{\hss \hbox to 6.0in{\hphantom{$\circ\ \ $\ I} ARPANET REFERENCE MODEL\hfil}\hss}}% ! 115: \rlap{\kern 5.250in\lower 3.259in\hbox to 0pt{\hss \hss}}% ! 116: \rlap{\kern 5.250in\lower 3.643in\hbox to 0pt{\hss \hbox to 6.0in{$\circ\ $ TRANSPORT SERVICE ACCESS POINT (TSAP):\hfil}\hss}}% ! 117: \rlap{\kern 5.250in\lower 3.809in\hbox to 0pt{\hss \hss}}% ! 118: \rlap{\kern 5.250in\lower 3.893in\hbox to 0pt{\hss \hbox to 6.0in{\hphantom{$\circ\ \ $ I} TAKES ADVANTAGE OF TCP's STRENGTHS,\hfil}\hss}}% ! 119: \rlap{\kern 5.250in\lower 4.059in\hbox to 0pt{\hss \hss}}% ! 120: \rlap{\kern 5.250in\lower 4.143in\hbox to 0pt{\hss \hbox to 6.0in{\hphantom{$\circ\ \ $\ I} WHILE GIVING ISO A FREE HAND ABOVE\hfil}\hss}}% ! 121: \rlap{\kern 5.250in\lower 4.309in\hbox to 0pt{\hss \hss}}% ! 122: \special{pn 1}% ! 123: \special{pa 7500 3935}% ! 124: \special{pa 7501 3935}% ! 125: \special{dt 0.050}% ! 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