Packet switching yog ib txoj hauv kev uas siv los ntawm qee lub khoos phis tawj network raws tu qauv kom xa cov ntaub ntawv hla kev sib txuas hauv zos lossis deb. Piv txwv ntawm pob ntawv hloov raws tu qauv yog Frame Relay, IP, thiab X.25.
How Packet Switching Works
Packet hloov pauv cov ntaub ntawv mus rau ntau qhov chaw uas tau ntim rau hauv cov ntawv tshwj xeeb hu ua pob ntawv. Cov no feem ntau yog xa los ntawm qhov chaw mus rau qhov chaw uas siv network keyboards thiab routers. Ces cov ntaub ntawv yog reassembled ntawm qhov chaw.
Txhua pob ntawv muaj cov ntaub ntawv chaw nyob uas txheeb xyuas lub khoos phis tawj xa thiab cov neeg tau txais kev npaj. Siv cov chaw nyob no, network keyboards thiab routers txiav txim siab yuav ua li cas zoo tshaj rau kev hloov cov pob ntawv ntawm hops ntawm txoj kev mus rau nws qhov chaw. Muaj cov apps pub dawb, xws li Wireshark, uas ntes thiab saib cov ntaub ntawv yog tias tsim nyog.
Npaj yog dab tsi?
Hauv kev sib tham hauv computer, lub plhaw sawv cev rau ib feem ntawm txoj kev tag nrho ntawm qhov chaw thiab qhov chaw. Thaum sib txuas lus hauv Is Taws Nem, piv txwv li, cov ntaub ntawv dhau los ntawm ntau cov khoom siv nruab nrab, suav nrog routers thiab keyboards, tsis yog ntws ncaj qha los ntawm ib lub xaim. Txhua lub cuab yeej ua rau cov ntaub ntawv dhia ntawm ib qho point-to-point network txuas thiab lwm qhov.
Tus hop suav sawv cev rau tag nrho cov khoom siv uas muab cov ntaub ntawv hla dhau. Feem ntau hais lus, ntau lub hops uas cov ntaub ntawv pob yuav tsum hla mus txog lawv qhov chaw, qhov ntau dua qhov kis tau tus mob qeeb.
Cov khoom siv hluav taws xob xws li ping tuaj yeem siv los txiav txim siab suav mus rau qhov chaw tshwj xeeb. Ping tsim cov pob ntawv uas suav nrog thaj chaw tshwj tseg rau kev suav suav. Txhua lub sij hawm ib lub cuab yeej muaj peev xwm tau txais cov pob ntawv no, cov cuab yeej ntawd hloov cov pob ntawv thiab ua kom cov hop suav los ntawm ib qho. Tsis tas li ntawd, cov cuab yeej sib piv cov hop suav nrog qhov kev txwv ua ntej thiab muab pov tseg cov pob ntawv yog tias nws cov hop suav ntau dhau. Qhov kev txiav txim no tiv thaiv cov pob ntawv los ntawm qhov tsis muaj qhov kawg bouncing nyob ib ncig ntawm lub network vim kev ua yuam kev.
Pros and Cons of Packet Switching
Packet switching yog lwm txoj hauv kev hloov pauv cov txheej txheem siv keeb kwm rau kev sib txuas hauv xov tooj thiab qee zaum nrog ISDN kev sib txuas.
Piv rau kev hloov pauv, pob ntawv hloov pauv muaj cov txiaj ntsig thiab qhov tsis zoo hauv qab no:
- Kev siv ntau dua ntawm tag nrho cov network bandwidth vim qhov yooj yim hauv kev xa cov pob ntawv me dua ntawm kev sib koom sib txuas.
- Packet switching networks feem ntau pheej yig dua los tsim kom muaj cov khoom siv tsawg dua.
- Kev ntseeg. Yog tias lub pob ntawv tsis tuaj txog raws li qhov xav tau ntawm nws qhov chaw, lub khoos phis tawj txais tau kuaj pom ib pob ntawv ploj lawm thiab thov kom nws rov ua dua.
- Packet switching muaj kev hloov pauv tsis siv neeg yuav tsum muaj ib qho ntawm nws txoj kev taug tsis tau.
-
ncua sij hawm ntev dua hauv kev txais cov lus vim yog lub sijhawm xav tau rau pob thiab cov pob ntawv. Rau ntau daim ntawv thov, ncua sij hawm tsis ntev txaus los ua qhov tseem ceeb, tab sis rau cov ntawv thov kev ua haujlwm siab zoo li lub sijhawm video, ntxiv Kev Pabcuam Zoo (QoS) thev naus laus zis feem ntau tsim nyog kom ua tiav qib kev ua tau zoo.
- Qhov muaj peev xwm rau kev pheej hmoo ntawm kev ruaj ntseg network muaj tshwm sim vim yog siv cov kev sib txuas ntawm lub cev. Cov txheej txheem thiab lwm cov ntsiab lus cuam tshuam hauv pob ntawv hloov khoom siv yuav tsum ua raws li kev tiv thaiv kev nyab xeeb tsim nyog.
- Latency is unpredictable.
