Kwi-intanethi ye-intanethi, i- CDN imele i- Network Delivery Content okanye iNethiwekhi yokuLawulwa koLwazi . I-CDN yinkqubo yomthengi / yomncedisi ohanjelwe ukuphucula ukuthembeka nokusebenza kwezicelo ze-intanethi.
Imbali yeCDNs
IiNethwekhi zokuThumela iiNkcazo zaqala ukucwangciswa njenge- WebWide WebWide (WWW) yaqhutyelwa ekuthandeni ngexesha lama-1990. Iingcali zezobuchwepheshe zaqonda ukuba i-Intanethi ayikwazi ukujongana nenqanaba elandayo ngokukhawuleza lendlela yokunxibelelana ngaphandle kweendlela ezinengqiqo zokulawula ukuhamba kwedatha.
Eyasungulwa ngo-1998, i-Akamai Technologies yinkampani yokuqala yokwakha ishishini elikhulu kwi-CDNs. Abanye ba landela ngeempumelelo ezahlukeneyo. Kamva, iinkampani ezahlukeneyo zethungelwano njenge-AT & T, iDeutsche Telekom kunye neTelstra zakha ii-CDN zazo. IiNethwekhi zokuThumela iiNgcaciso namhlanje ziphethe inxalenye ebalulekileyo yomxholo wewebhu, ingakumbi iifayile ezinkulu ezinjengevidiyo kunye nokulandwa kwezixhobo. Zibini ii-CDN zorhwebo nezingenanto.
Indlela i-CDN isebenza ngayo
Umnikezeli we-CDN ubeka iinkonzo zazo kwiindawo eziphambili kwi-intanethi. Umncedisi ngamnye uqulethe ixabiso elikhulu lokugcina indawo kunye nokukwazi ukuvumelanisa iikopi zalo nedatha kunye namanye amaseva kwinethiwekhi yomxholo ngokusebenzisa inkqubo ebizwa ngokuthi ukuphindaphinda . Ezi ncedisi zenza njengama-caches yedatha. Ukuze unikezele iinkcukacha ezigcinwe kubathengi emhlabeni wonke ngokufanelekileyo, ababoneleli be-CDN bafake iiseva zabo kwiindawo "eziphambili" ezahlukileyo kwindawo ezahlukahlukeneyo-iindawo ezidibanisa ngqo kwi-intanethi ye-intanethi, ngokuqhelekileyo kumaziko eenkcukacha ezikufutshane nababoneleli ngeenkonzo ze-intanethi (ISPs) . Abanye abantu bawabiza ngokuba yiPoint of Presence (PoP) okanye ii-"caches caches" ngokufanelekileyo.
Umshicileli womxholo onqwenela ukusabalalisa idatha yabo nge-CDN ababhalisi kunye nomboneleli. Ababoneleli be-CDN banikezela abavakalisi kwinethiwekhi yomncedisi wabo apho iinguqu zasekuqaleni zezinto eziqulathekileyo (ngokuqhelekileyo ifayile okanye amaqela eefayile) zingalayishwa ngokusabalalisa kunye nokugcinwa kwecaching. Ababoneleli bancedisa ii-URL okanye izikripthi abashicileli abangena kuzo kwiindawo zabo ukuze baxelele izinto ezigcinwe zizinto.
Xa abathengi be-Intanethi (iincwadi zewebhu okanye iifayile ezifanayo) zithumela izicelo zomxholo, umyalezo womncedisi owamkelayo uphendula kwaye uvuselela izicelo kumaseva e-CDN njengoko kufuneka. Amaseva e-CDN afanelekileyo anyuliweyo ukuhambisa umxholo ngokubhekiselele kwingingqi yomxhasi. I-CDN ngokufanelekileyo izisa iinkcukacha ezikufutshane nomceli ukuba unciphise umzamo ofunekayo wokuwuthumela kwi-intanethi.
Ukuba iseva ye-CDN iceliwe ukuba ithumele into yenkomathi kodwa ingenayo ikopi, iya kucela umncedisi weCDN yomzali omnye. Ukongeza kokudlulisela ikopi kumceli, umncedisi we-CDN uya kugcina (ikopi) ikopi yayo ukuze izicelo ezilandelayo zento enye zizaliseke ngaphandle kokufuna ukubuza umzali kwakhona. Izinto ziyakususwa kwi-cache okanye xa umncedisi ufuna ukukhulula isikhala (inkqubo ebizwa ngokuthi ukukhutshwa ) okanye xa into ingacelwa ixesha elithile (inkqubo ebizwa ngokuthi ukuguga ).
Iinzuzo zoNxibelelwano lweeNethwekhi zokuThumela
Ii-CDN ezibonelela ngokubonelela ngenzuzo, abavakalisi bokuqukethwe kunye nabaxumi (abasebenzisi) ngeendlela ezininzi:
- Ababoneleli abakhulu abanjengoAkamai baye benza amashishini ahlawuleyo kwii-CDN, kodwa iifom ezincinci ziye zaphumelela. Ezi nkqubo zihanjisiweyo zinceda ukunciphisa umthwalo jikelele jikelele kwi-Intanethi, ukwenza iWebhu isebenze ngokufanelekileyo kumntu wonke.
- Ii-CDN zinokuphucula umgangatho womncedisi wenkonzo. Ngokwenza ukudibanisa kwabo kuphendule ngakumbi kunye nomxholo ngokukhawuleza ukukhuphela, abapapashi banokwandisa ukwaneliseka kwabathengi babo (kwaye bathambekele ekutsaleni abathengi abaninzi).
- Abasebenzisi bamakhasimende banandipha ngokukhawuleza ukulandelwa komxholo onikwe amandla we-CDN njengamavidiyo kunye nokuphendula ngokubhetele ngakumbi (i- latency encane yomnatha , amaxesha okuhamba okufutshane okufutshane) kwezicelo ze-Intanethi.
Imiba eneCDN
Ababoneleli be-CDN bahlawula abathengi babo ngokwemodareythi yenethiwekhi nganye eyenza ngezicelo zabo kunye neenkonzo. Imirhumo inokuqokelela ngokukhawuleza, ngokukodwa xa abathengi babhalisele kwizicwangciso zenkonzo kunye kunye nemida yabo. Iziganeko ezihamba ngokukhawuleza zendlela ezibangelwa ziziganeko zentlalo kunye neendaba, okanye ngamanye amaxesha ukuhlaselwa kweNkonzo (DoS) , kungabangela ingxaki.
Ukusebenzisa i-CDN kwandisa umshicileli wokuqukethwe ngokuthembela kumashishini angaphandle. Ukuba umboneleli unemiba yezobugcisa kunye nezibonelelo zayo, abasebenzisi banokufumana iingxaki ezinokubaluleka ezinjengeenkcazo ezinokusasaza kwividiyo okanye ixesha lokunxibelelana. Abanikazi bewebhusayithi banokufumana izikhalazo nje ngokuba abathengi abapheli ngokubanzi abaqapheli iiCDN.