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1.1 ! root 1: .PS ! 2: .ps 20 ! 3: boxht = .754; boxwid = 1.75 ! 4: ## figure 2 ! 5: UPRG: box ! 6: move from UPRG.w up .015 ! 7: line invisible right 1.75 "{USER}" " " ! 8: move from UPRG.w down .015 ! 9: line invisible right 1.75 " " "{PROGRAMS}" ! 10: APP: box with .n at UPRG.s ! 11: move from APP.w up .015 ! 12: line invisible right 1.75 "{LAYER 7}" " " ! 13: move from APP.w down .015 ! 14: line invisible right 1.75 " " "{APPLICATION}" ! 15: PRES: box with .n at APP.s ! 16: move from PRES.w up .015 ! 17: line invisible right 1.75 "{LAYER 6}" " " ! 18: move from PRES.w down .015 ! 19: line invisible right 1.75 " " "{PRESENTATION}" ! 20: SESS: box with .n at PRES.s ! 21: move from SESS.w up .015 ! 22: line invisible right 1.75 "{LAYER 5}" " " ! 23: move from SESS.w down .015 ! 24: line invisible right 1.75 " " "{SESSION}" ! 25: TRANS: box with .n at SESS.s ! 26: box shaded with .nw at TRANS.nw ht .24 width 1.25 ! 27: move from TRANS.nw down .225 ! 28: line invisible right 1.25 "{MAGIC-BOX}" " " ! 29: move from TRANS.nw down .48 ! 30: line invisible right 1.75 "{LAYER 4}" " " ! 31: move from TRANS.nw down .51 ! 32: line invisible right 1.75 " " "TRANSPORT" ! 33: line from TRANS.nw to TRANS.sw ! 34: move from TRANS.nw down .005 ! 35: line right .875 ! 36: NET: box with .n at TRANS.s ! 37: move from NET.w up .015 ! 38: line invisible right 1.75 "{LAYER 3}" " " ! 39: move from NET.w down .015 ! 40: line invisible right 1.75 " " "{NETWORK}" ! 41: DL: box with .n at NET.s ! 42: move from DL.w up .015 ! 43: line invisible right 1.75 "{LAYER 2}" " " ! 44: move from DL.w down .015 ! 45: line invisible right 1.75 " " "{DATA LINK}" ! 46: PHY: box with .n at DL.s ! 47: move from PHY.w up .015 ! 48: line invisible right 1.75 "{LAYER 1}" " " ! 49: move from PHY.w down .015 ! 50: line invisible right 1.75 " " "{PHYSICAL}" ! 51: # ! 52: # ! 53: boxwid = 6.0 ! 54: move from PRES.e right .5; move up .3; X1: Here ! 55: line invis right 6.0 "\hbox to 6.0in{$\circ\ $ NETWORK LAYER (OR BELOW):\hfil}" " " ! 56: move from X1 down .25; X2: Here ! 57: line invis right 6.0 "\hbox to 6.0in{\hphantom{$\circ\ \ $\ I} RE--INVENTS TCP\hfil}" " " ! 58: move from X2 down .25; X4: Here ! 59: line invis right 6.0 "\hbox to 6.0in{\hphantom{$\circ\ \ $\ I} PREVENTS USE OF BOARD--LEVEL PRODUCTS\hfil}" " " ! 60: move from X4 down .25; X5: Here ! 61: move from X5 down .3; X6: Here ! 62: line invis right 6.0 "\hbox to 6.0in{$\circ\ $ SESSION LAYER (OR ABOVE):\hfil}" " " ! 63: move from X6 down .25; X7: Here ! 64: line invis right 6.0 "\hbox to 6.0in{\hphantom{$\circ\ \ $\ I} TOO MUCH DEPENDENCY ON TCP AND THE\hfil}" " " ! 65: move from X7 down .25; X8: Here ! 66: line invis right 6.0 "\hbox to 6.0in{\hphantom{$\circ\ \ $\ I} ARPANET REFERENCE MODEL\hfil}" " " ! 67: move from X8 down .25; X9: Here ! 68: move from X9 down .3; X10: Here ! 69: line invis right 6.0 "\hbox to 6.0in{$\circ\ $ TRANSPORT SERVICE ACCESS POINT (TSAP):\hfil}" " " ! 70: move from X10 down .25; X11: Here ! 71: XA: line invis right 6.0 "\hbox to 6.0in{\hphantom{$\circ\ \ $ I} TAKES ADVANTAGE OF TCP's STRENGTHS,\hfil}" " " ! 72: move from X11 down .25; X12: Here ! 73: line invis right 6.0 "\hbox to 6.0in{\hphantom{$\circ\ \ $\ I} WHILE GIVING ISO A FREE HAND ABOVE\hfil}" " " ! 74: .ps 1 ! 75: move from XA.e left .75; XA1: Here ! 76: line dotted from XA1 right .001 ! 77: ## ! 78: .PE
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