- Amaphrothokholi enethiwekhi amasethi emithetho avumela ukuxhumana phakathi kwamadivayisi akunethiwekhi.
- Imodeli ye-OSI ihlukanisa ukuxhumana kube izingqimba eziyisikhombisa, ngasinye sinomsebenzi othile.
- Amaphrothokholi afana ne-TCP/IP, i-HTTP, ne-DNS abalulekile ekudluliselweni kwedatha ku-inthanethi.
- Ukuphepha kumaphrothokholi kufinyelelwa ngokubethela kanye nokuqinisekisa ukuvikela imininingwane edlulisiwe.
Esikhathini solwazi lwedijithali nokuxhumana, izivumelwano zenethiwekhi zidlala indima ebalulekile ekuxhumekeni nasekushintshisaneni ngedatha ku-inthanethi. Lezi zinhlelo, ezisebenza ngemuva kwemisebenzi yethu ye-inthanethi, zisenza sikwazi ukuthumela ama-imeyili, sibuke amavidiyo aku-inthanethi, sibambe iqhaza ezingqungqutheleni zamavidiyo futhi sifinyelele inqwaba yezinsizakalo ze-inthanethi. Kulesi sihloko, sizohlola ngokuningiliziwe ukuthi yiziphi izivumelwano zenethiwekhi, ukuthi zisebenza kanjani, nokuthi kungani zibaluleke kangaka ku-inthanethi yethu yansuku zonke. Ngakho-ke zilungiselele ukujula emhlabeni othakazelisayo wamanethiwekhi futhi uthole ukuthi amadivaysi axhumana kanjani ku-inthanethi!
Amaphrothokholi Enethiwekhi: Lokho Ayikho nokuthi Asebenza Kanjani
Amaphrothokholi enethiwekhi amasethi emithetho namazinga asungulwe ukunika amandla ukuxhumana phakathi kwamadivayisi axhunywe kunethiwekhi. Le mithetho ichaza ukuthi idatha edluliswa kunethiwekhi ithunyelwa kanjani, yamukelwe, ifomethwa futhi icutshungulwa kanjani. Ngaphandle kwamaphrothokholi enethiwekhi, bekungeke kwenzeke ukuthi amadivayisi ahlukene aqondane futhi nolwazi luhambe kahle nangokuvikelekile kuyo yonke i-inthanethi.
Amaphrothokholi enethiwekhi angabhekwa njengolimi oluvamile oluvumela ukuxhumana phakathi kwamadivayisi ahlukene, kungakhathaliseki ukuthi umkhiqizi wawo noma isistimu yokusebenza. Njengasengxoxweni phakathi kwabantu, kumele kulandelwe isethi yemithetho nezimiso ukuze kuqinisekiswe ukuthi umyalezo udluliswa futhi uhunyushwa ngendlela efanele. Ngokufanayo, amaphrothokholi enethiwekhi asungula imithetho nezinqubo ukuze amadivayisi ashintshisane ngolwazi ngempumelelo.
Indlela Amaphrothokholi Enethiwekhi Asebenza Ngayo
Amaphrothokholi enethiwekhi asebenza ngendlela efanayo nohlelo lokuxhumana kwabantu. Zicabange ukhuluma nothile ngolunye ulimi futhi udinga ukudlulisa umlayezo. Ukuze uqiniseke ukuthi uyaqonda, kufanele ulandele imithetho ethile yohlelo futhi usebenzise ulwazimagama olwabiwe. Izivumelwano zenethiwekhi zisebenza ngendlela efanayo, kodwa esikhundleni sezilimi zabantu, zisebenzisa isethi yemithetho yobuchwepheshe.
Uma idivayisi ithumela ulwazi ngenethiwekhi, izivumelwano zenethiwekhi zihlukanisa idatha ibe amaphakethe amancane futhi iwathumele ngokulandelana kwawo. Lawa maphakethe aqukethe ulwazi olufana nekheli lomthumeli nomamukeli, kanye nedatha ewusizo. Uma amaphakethe efika lapho aya khona, amaphrothokholi enethiwekhi anesibopho sokuwahlanganisa kabusha futhi alethe umlayezo ophelele kudivayisi eyamukelayo.
Izendlalelo kanye ne-OSI Model
Ukuze uqonde kangcono ukuthi amaphrothokholi enethiwekhi asebenza kanjani, kuyasiza ukwazi imodeli ye-OSI (Open Systems Interconnection). Imodeli ye-OSI iwuhlaka lomqondo oluhlukanisa inqubo yokuxhumana ibe izingqimba eziyisikhombisa, ngayinye enesethi yayo yemisebenzi ethile. Isendlalelo ngasinye sinesibopho sesici esithile sokuxhumana futhi sixhumana nezingqimba eziseduze ngokusebenzisa ukuxhumana okuchazwe kahle.
Lezi izendlalelo eziyisikhombisa zemodeli ye-OSI:
- ungqimba olungokwenyama
- Isendlalelo Sesixhumanisi Sedatha
- Isendlalelo senethiwekhi
- Isendlalelo sezokuthutha
- Isendlalelo seseshini
- Isendlalelo sephrezentheshini
- Isendlalelo sohlelo lokusebenza
Isendlalelo ngasinye semodeli ye-OSI sinesethi yaso yamaphrothokholi asetshenziselwa ukwenza imisebenzi ethile. Isibonelo, kusendlalelo senethiwekhi, izivumelwano zomzila zinesibopho sokunquma indlela engcono kakhulu yamaphakethe wedatha ukuze afinyelele lapho aya khona. Kusendlalelo sezokuthutha, izivumelwano ezifana ne-TCP (Transmission Control Protocol) kanye ne-UDP (User Datagram Protocol) zinesibopho sokuqinisekisa ukulethwa kwamaphakethe edatha nokusungula ukuxhumana okuthembekile noma okungathembekile, ngokulandelana.
Amaphrothokholi enethiwekhi ajwayelekile
Kunamaphrothokholi amaningi enethiwekhi asetshenziswa ku-inthanethi namanethiwekhi endawo. Amanye amaphrothokholi ajwayelekile yilezi:
- I-TCP/IP (Iphrothokholi Yokulawula Ukudlulisa/Iphrothokholi Ye-inthanethi): Lena iphrothokholi esetshenziswa kakhulu ku-inthanethi kanye namanethiwekhi amaningi endawo. I-TCP/IP inikeza ukuxhumana okuthembekile futhi iqinisekisa ukuthi idatha ilethwa ngendlela efanele. Futhi inesibopho sokunikeza amakheli e-IP kanye namaphakethe wedatha womzila.
- I-HTTP (i-Hypertext Transfer Protocol): Le protocol isetshenziselwa ukudlulisa ulwazi, njengamakhasi ewebhu, ku-inthanethi. I-HTTP iphrothokholi eyenza ukuxhumana phakathi kweziphequluli zewebhu namaseva ewebhu. Amawebhusayithi aqala ngokuthi “http://” asebenzisa le mithetho yomthetho.
- I-FTP (Ifayela Lokudlulisa Ifayela): Njengoba igama liphakamisa, i-FTP isetshenziselwa ukudlulisa amafayela phakathi kwamadivayisi akunethiwekhi. Ivamise ukusetshenziselwa ukulayisha nokulanda amafayela kumaseva ewebhu.
- I-DNS (Isistimu Yegama Lesizinda): Le nqubo yomthetho inesibopho sokuhumusha amagama wesizinda (afana nokuthi www.example.com) abe amakheli e-IP. Uma sithayipha igama lesizinda esipheqululini sethu sewebhu, iphrothokholi ye-DNS inesibopho sokuthola ikheli le-IP elihambisanayo nokusungula ukuxhumana neseva efanele.
- I-SMTP (Iphrothokholi Yokudlulisa Imeyili Elula): I-SMTP iphrothokholi esetshenziselwa ukuthumela ama-imeyili. Inesibopho sokudluliswa kwemiyalezo ye-imeyili phakathi kwamaseva e-imeyili.
- I-POP (Iphrothokholi Yehhovisi Leposi) y I-IMAP (Iphrothokholi Yokufinyelela Umlayezo We-inthanethi): Lezi zivumelwano zisetshenziselwa ukuthola ama-imeyili kumaklayenti e-imeyili. I-POP ilanda imilayezo kusuka kuseva futhi iyilondoloze kudivayisi yasendaweni, kuyilapho i-IMAP ivumela ukufinyelela kumilayezo egcinwe kuseva ngesikhathi sangempela.
Imibuzo Evame Ukubuzwa Ngamaphrothokholi Enethiwekhi
1. Uyini umehluko phakathi kwe-TCP ne-UDP? I-TCP (Transmission Control Protocol) kanye ne-UDP (User Datagram Protocol) yizinqubo ezimbili zokuthutha ezisetshenziswa kumanethiwekhi ekhompyutha. Umehluko omkhulu usezingeni lokuthembeka kokulethwa kwedatha. I-TCP inikeza ukulethwa okuthembekile, okusho ukuthi amaphakethe edatha alethwa ngokulandelana okufanele futhi ukufika kwawo kuqinisekisiwe. I-UDP, ngakolunye uhlangothi, iyinqubo engathembekile engaqinisekisi ukulethwa noma ukuhleleka kwamaphakethe. I-UDP ifaneleka kangcono ezinhlelweni zokusebenza lapho isivinini sibaluleke kakhulu kunobuqotho bedatha, njengevidiyo yesikhathi sangempela noma ukudluliselwa kwezwi.
2. Ukuphepha kwedatha kuqinisekiswa kanjani kumaphrothokholi enethiwekhi? Ukuphepha kwedatha kumaphrothokholi enethiwekhi kufezwa ngezindlela ezahlukene. Enye yalezi ukusetshenziswa kwamaphrothokholi okubethela, njenge-SSL/TLS (Secure Sockets Layer/Transport Layer Security), abethela idatha ngesikhathi sokudluliselwa ukuze avimbele ukuthi ingabanjwa futhi ifundwe ngabantu besithathu abangagunyaziwe. Ezinye izindlela zifaka phakathi ukusetshenziswa kwama-firewall ukulawula ukufinyelela kwenethiwekhi, ukuqinisekiswa komsebenzisi, kanye nokubethela iphasiwedi.
3. Ukuxhumana kusungulwa kanjani kuphrothokholi ye-TCP? Kuphrothokholi ye-TCP, inqubo ebizwa ngokuthi "ukuxhawulana" isetshenziswa ukusungula ukuxhumana phakathi kwamadivayisi amabili. Ukuxhawulana kunezinyathelo ezintathu:
- Idivayisi eqalisa uxhumano (okuthiwa iklayenti) ithumela iphakethe elikhethekile elibizwa ngokuthi isicelo sokuxhuma (SYN) kudivayisi eyamukelayo (ebizwa ngokuthi iseva).
- Iseva iphendula ngephakethe eliqukethe i-SYN kanye nenombolo yokuvuma (ACK) ukukhombisa ukuthi isilungele ukusungula uxhumano.
- Ekugcineni, iklayenti liphendula ngephakethe le-ACK ukuze liqinisekise ukuthi liyitholile impendulo yeseva.
Uma le nqubo yokuxhawula isiqediwe, uxhumano lubhekwa njengolumisiwe futhi amadivayisi angaqala ukushintshanisa idatha.
4. Kuyini ukubaluleka kwamaphrothokholi enethiwekhi esikhathini se-Internet of Things (IoT)? Esikhathini se-Internet of Things, lapho amadivayisi exhumana khona kakhulu, amaphrothokholi enethiwekhi adlala indima ebalulekile. La maphrothokholi avumela amadivayisi e-IoT ukuthi axhumane futhi axhumane nezinsizakalo zamafu ngendlela ephumelelayo nangokuphephile. Amaphrothokholi afana ne-MQTT (Message Queuing Telemetry Transport) kanye ne-CoAP (Constrained Application Protocol) athuthukiswe ngqo ukuze kushintshwe idatha ezindaweni ze-IoT, okwenza kube lula ukuhlanganiswa kwamadivayisi kanye nokusebenzisana.
5. Iyiphi indima edlalwa yizinhlelo zenethiwekhi kumanethiwekhi angenantambo? Izinhlelo zenethiwekhi zibaluleke ngokulinganayo kumanethiwekhi angenantambo, njenge-Wi-Fi namanethiwekhi eselula. Lezi zinhlelo zivumela amadivayisi ukuthi axhumeke kunethiwekhi engenantambo futhi axhumane. Izinhlelo zenethiwekhi ezingenantambo, njenge-IEEE 802.11 standard ye-Wi-Fi, zichaza ukuthi idatha idluliselwa kanjani nge-wireless medium nokuthi ukuxhumana phakathi kwamadivayisi kuphathwa kanjani. Ngaphandle kwalezi zinhlelo, amadivayisi abengeke akwazi ukuxhumana kahle kunethiwekhi engenantambo.
6. Amaphrothokholi enethiwekhi ashintsha kanjani ngokuhamba kwesikhathi? Amaphrothokholi enethiwekhi ahlala eshintsha ukuze azivumelanise nezidingo zobuchwepheshe ezishintshayo kanye nezidingo zomsebenzisi. Njengoba kuvela izinhlelo zokusebenza nezinsizakalo ezintsha, amaphrothokholi akhona ayathuthukiswa futhi athuthukiswe, noma amasha adalwe ukuze ahlangabezane nezidingo ezithile. Ngaphezu kwalokho, intuthuko ekuphepheni kwenethiwekhi, isivinini, kanye nokusebenza kahle nakho kuholela ekuguqukeni kwephrothokholi. Isibonelo, ukuguquka kusuka ku-IPv4 kuya ku-IPv6 kwaqaliswa ukubhekana nokuntuleka kwekheli lephrothokholi ye-IPv4 nokuqinisekisa ukuxhumana kwesikhathi eside ezweni elixhumene kakhulu.
Isiphetho
Amaphrothokholi enethiwekhi ayizisekelo ezingabonakali kodwa ezibalulekile ze-inthanethi nokuxhumana kwenethiwekhi yendawo. Ngenxa yalezi sethi zemithetho namazinga, singajabulela ulwazi lokuphequlula iwebhu, ukwabelana ngolwazi, ukuxhumana nokusebenzisa izinsiza ze-inthanethi ngokuyikho nangokuphephile. Amaphrothokholi enethiwekhi ayiglue engabonakali ebamba ingqalasizinda yedijithali ndawonye, ivumela amadivayisi ukuthi axhumeke futhi idatha idluliselwe emhlabeni jikelele. Sithemba ukuthi lesi sihloko sinikeze ukukhanya kokuthi izimiso zenethiwekhi ziyini nokuthi zisebenza kanjani, futhi ikunikeze ukuqonda okujulile kobuchwepheshe obusekela ukuphila kwethu kwansuku zonke kwedijithali.
