Jul 1, 2015

Computer Network - Lesson 05

http://www.aluth.com/2015/07/computer-network-lesson-05.html
mß.Kl cd,lrKh
05 fjks fldgi


mß.Kl lafYa;%fha fkÜj¾lska ms<sn|j oekqu ,nd.ekSu i|yd wm úiska bosßm;a lrk fuu mdvï ud,dfõ ;j;a lreKq /ila

fï ,smsh u.ska idlÉPd lruq¡ wms miq.sh ,smsfhka fudvï j¾. 3 la .ek i|ykalrd¡ ta.ek jeä ÿrg;a oek.uq¡

  1. Internal modem
  2. External modem
  3. Wireless modem

  1. Internal modem

fuh mß.Klfha System unit tl ;=, iú lrkq ,nhs' Mother board tl u; we;s PCI slot u.ska fuh mß.Klhg iïnkaO fõ' fuhg wjYH lrk úÿ,sh Mother board tl
u.skau imhkq ,efí¡


fudvï tl mß.Klhg iïnkaO fjk wdldrh¡


  2. External modem

 
fuh mß.Klhg msg;ska iïnkaO fõ'fuys tla fl,jrla mß.Klhg iïnkaO jk w;r wfkla fl,jr telephone line tlg iïnkaO fõ' thg wjYH úÿ,sh ndysßka imhkq ,efí'






fuh mß.Klhg iïnkaO fjk wdldrh¡


3. Wireless modem

fuu Modem j¾.h Serial port fyda USB port wdOdrfhka mß.Klhg iújk kuq;a wfkla mi wire rys;j .=jka úÿ,s ;rx. fyda Micro waves Tiafia ixksfõok moaO;shg iïnkaO fõ'


  • Bridge
   o;a; ixksfõokfhaÈ mß.Kl cd, ;=< o;a; yqjudrefõÈ we;sjk ;onoh uÕ yrjd .ekSug fhdod.kakd Wmdx.hls' fuys§ isÿ lrkq ,nkafka jeäjk ;onoh u.yrjd .ekSug cd,h fldgia j,g fjka lsÍuhs' Bridge hkq oDvdx. u; l%shdlrk WmlrKhls' fuh Nú; lr cd, lsysmhla iïnkaO l, yels w;r tajdfha ;sìh hq;af;a tlu protocol tlls'


  • Gateway
fuu Wmx.h cd, fjka lsÍu ioyd Ndú;d jk w;r IP ia:rh u; l%shd lrhs' Gateway tll l%shdldÍ;ajh uDÿldx. u.ska f.dvke.sh yel' fjka lrk ,o cd, u; tlska tlg fjkia Protocol jqjo yeisrùug fuhg yelshdj we;' wdh;ksl mß.Kl cd, ;j;a cd,hlg iïnkaO lsÍfïÈ fuu l%uh wjYH fõ'
  • Router
fuho cd,h fldgia lsÍug Ndú;d lrkq ,nk Wmdx.hls'kj fufyhqï moaO;s u.ska th iSreudre l< yelsh' LAN lsysmhla we;s wdh;khla wka;¾cd,hg iïnkaO lsÍfïÈ fuh Ndú;d lrkq ,nhs'


  • HUB
Bus wdldrfha mß.Kl cd,hla ;drld wdldrhg yerùfïÈ HUB hk Wmdx.h Ndú;d lrkq ,nhs'
 


  • Repeater
cd,hla úYd, jk úg we;sjk ÿ¾j, ix{d j¾Ok ioyd Repeater Ndú; fõ'
  • Switch
fuys l%shdldß;ajh HUB tllg iudk jk kuq;a Èhqkq ;dlaIKhla fï ;=, mj;S' HUB tll ldrHho fuu.ska isÿ lrk w;r o;a; j, ;onoh md,kh lsÍu ùfYaIfhkau isÿ lrkq ,nhs'

o;a; iïfma%Ikh i,lk úg mß.Kl cd, iïfma%Ik udOHh" protocol yd Modem hk ixl,amh m%udKj;a jk kuq;a mß.Kl f,dalfha ÈhqKqj;a iu. by;ska olajk ,o Bridge" Gateway " Router "HUB" Repeater "Switch hk Wmdx. Ndú;d lrkq ,nhs' cd, l%ufha mj;sk hï hï ÿ¾j,;d u.yrjd .ekSug ms,shï f,i tu Wmdx. Ndú;d lrhs'





 ;rula úYd,
fkÜjlska i|yd fuu fkÜj¾la iaúÜÉ ke;=ju neß fldgils¡

mß.Kl cd,hl l%shdlÍ;ajh hkq Network card keue;s oDvdx. Wmdx.h u; wod, protocols tl l%shdldÍ ù úúO fiajdjka ioyd u.mE§uhs' fuu l%shdldÍ;ajh ia:r 4lska oelaúh yel'

  1. Application layer
  2. TCP layer
  3. IP layer
  4. Physical layer 

fuys§ oDvdx. ia:rh Physical layer jYfhka olajk w;r th u; IP l%shd;aul fõ' TCP yd IP hkq uDÿldx. folls' TCP layer tl u; úoHq;a ;eme,a jeks Application layer l%shd;aul fõ'

tfykï
Thd,g jvd;a jákd f;dr;=re iu.ska ó,. mdvñka yuqfjuq¡ miq.sh mdvï my;ska mSúi n,kak¡





 
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