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1.1 ! root 1: .PS ! 2: .ps 20 ! 3: boxht = .754; boxwid = 1.75 ! 4: UPRG: box ! 5: move from UPRG.w up .015 ! 6: line invisible right 1.75 "{USER}" " " ! 7: move from UPRG.w down .015 ! 8: line invisible right 1.75 " " "{PROGRAMS}" ! 9: APP: box with .n at UPRG.s ! 10: move from APP.w up .015 ! 11: line invisible right 1.75 "{LAYER 7}" " " ! 12: move from APP.w down .015 ! 13: line invisible right 1.75 " " "{APPLICATION}" ! 14: PRES: box with .n at APP.s ! 15: move from PRES.w up .015 ! 16: line invisible right 1.75 "{LAYER 6}" " " ! 17: move from PRES.w down .015 ! 18: line invisible right 1.75 " " "{PRESENTATION}" ! 19: SESS: box with .n at PRES.s ! 20: move from SESS.w up .015 ! 21: line invisible right 1.75 "{LAYER 5}" " " ! 22: move from SESS.w down .015 ! 23: line invisible right 1.75 " " "{SESSION}" ! 24: TRANS: box with .n at SESS.s ! 25: box shaded with .nw at TRANS.nw ht .24 width .875 ! 26: move from TRANS.nw down .225 ! 27: line invisible right .875 "{TSAP}" " " ! 28: move from TRANS.nw down .48 ! 29: line invisible right 1.75 "{LAYER 4}" " " ! 30: move from TRANS.nw down .51 ! 31: line invisible right 1.75 " " "TRANSPORT" ! 32: line from TRANS.nw to TRANS.sw ! 33: move from TRANS.nw down .005 ! 34: line right .875 ! 35: NET: box with .n at TRANS.s ! 36: move from NET.w up .015 ! 37: line invisible right 1.75 "{LAYER 3}" " " ! 38: move from NET.w down .015 ! 39: line invisible right 1.75 " " "{NETWORK}" ! 40: DL: box with .n at NET.s ! 41: move from DL.w up .015 ! 42: line invisible right 1.75 "{LAYER 2}" " " ! 43: move from DL.w down .015 ! 44: line invisible right 1.75 " " "{DATA LINK}" ! 45: PHY: box with .n at DL.s ! 46: move from PHY.w up .015 ! 47: line invisible right 1.75 "{LAYER 1}" " " ! 48: move from PHY.w down .015 ! 49: line invisible right 1.75 " " "{PHYSICAL}" ! 50: # ! 51: # ! 52: boxwid = 6.0 ! 53: move from PRES.e right .5; move up .3; X1: Here ! 54: line invis right 6.0 "\hbox to 6.0in{$\circ\ $ NETWORK LAYER (OR BELOW):\hfil}" " " ! 55: move from X1 down .25; X2: Here ! 56: line invis right 6.0 "\hbox to 6.0in{\hphantom{$\circ\ \ $\ I} RE--INVENTS TCP\hfil}" " " ! 57: move from X2 down .25; X4: Here ! 58: line invis right 6.0 "\hbox to 6.0in{\hphantom{$\circ\ \ $\ I} PREVENTS USE OF BOARD--LEVEL PRODUCTS\hfil}" " " ! 59: move from X4 down .25; X5: Here ! 60: move from X5 down .3; X6: Here ! 61: line invis right 6.0 "\hbox to 6.0in{$\circ\ $ SESSION LAYER (OR ABOVE):\hfil}" " " ! 62: move from X6 down .25; X7: Here ! 63: line invis right 6.0 "\hbox to 6.0in{\hphantom{$\circ\ \ $\ I} TOO MUCH DEPENDENCY ON TCP AND THE\hfil}" " " ! 64: move from X7 down .25; X8: Here ! 65: line invis right 6.0 "\hbox to 6.0in{\hphantom{$\circ\ \ $\ I} ARPANET CLIENT/SERVICE MODEL\hfil}" " " ! 66: move from X8 down .25; X9: Here ! 67: move from X9 down .3; X10: Here ! 68: line invis right 6.0 "\hbox to 6.0in{$\circ\ $ TRANSPORT SERVICE ACCESS POINT (TSAP):\hfil}" " " ! 69: move from X10 down .25; X11: Here ! 70: XA: line invis right 6.0 "\hbox to 6.0in{\hphantom{$\circ\ \ $ I} TAKES ADVANTAGE OF TCP's STRENGTHS,\hfil}" " " ! 71: move from X11 down .25; X12: Here ! 72: line invis right 6.0 "\hbox to 6.0in{\hphantom{$\circ\ \ $\ I} WHILE GIVING MAP/TOP A FREE HAND ABOVE\hfil}" " " ! 73: .ps 1 ! 74: move from XA.e left .75; XA1: Here ! 75: line dotted from XA1 right .001 ! 76: .PE
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