{"id":736,"date":"2019-01-16T23:45:22","date_gmt":"2019-01-16T21:45:22","guid":{"rendered":"https:\/\/blog.nav.ro\/?p=736"},"modified":"2019-02-19T13:04:09","modified_gmt":"2019-02-19T11:04:09","slug":"nodurile-dintr-o-retea-de-calculatoare-explicate","status":"publish","type":"post","link":"https:\/\/www.nav.ro\/blog\/nodurile-dintr-o-retea-de-calculatoare-explicate\/","title":{"rendered":"Nodurile dintr-o re\u021bea de calculatoare explicate"},"content":{"rendered":"<p>Un nod este orice dispozitiv fizic dintr-o re\u021bea de alte dispozitive care poate trimite, primi \u0219i da mai departe informa\u021bii. Computerul este cel mai des \u00eent\u00e2lnit nod \u0219i se nume\u0219te adesea nodul computerului sau nodul de internet.<\/p>\n<p>Modem-urile, switch-urile, hub-urile, serverele \u0219i imprimantele sunt, de asemenea, noduri, la fel ca \u0219i alte dispozitive care se conecteaz\u0103 prin WiFi sau Ethernet. De exemplu, o re\u021bea care conecteaz\u0103 trei computere \u0219i o imprimant\u0103, al\u0103turi de alte dou\u0103 dispozitive f\u0103r\u0103 fir, are \u00een total \u0219ase noduri.<\/p>\n<p>Nodurile dintr-o re\u021bea de calculatoare trebuie s\u0103 aib\u0103 o anumit\u0103 form\u0103 de identificare, cum ar fi o adres\u0103 IP sau o adres\u0103 MAC, pentru a fi recunoscute de alte dispozitive din re\u021bea. Un dispozitiv f\u0103r\u0103 aceste informa\u021bii sau unul care a fost deconectat nu mai func\u021bioneaz\u0103 ca un nod.<\/p>\n<p><strong>Ce face un nod de re\u021bea?<\/strong><\/p>\n<p>Nodurile de re\u021bea sunt piesele fizice care alc\u0103tuiesc o re\u021bea, deci exist\u0103 adesea c\u00e2teva tipuri diferite.<\/p>\n<p>Un nod de re\u021bea este de obicei orice dispozitiv care prime\u0219te \u0219i apoi comunic\u0103 ceva prin re\u021bea, dar poate primi \u0219i salva doar datele, transmi\u021b\u00e2nd informa\u021bii \u00een alt\u0103 parte sau poate crea \u0219i trimite date.<\/p>\n<p>De exemplu, un nod de computer poate crea copii de rezerv\u0103 online pentru fi\u0219iere sau trimite un e-mail, dar poate \u0219i s\u0103 fac\u0103 streaming video \u0219i s\u0103 descarce alte fi\u0219iere. O imprimant\u0103 din re\u021bea poate primi solicit\u0103ri de imprimare de la alte dispozitive din re\u021bea \u00een timp ce un scaner poate trimite imagini \u00eenapoi la calculator. Un router determin\u0103 ce date sunt trimise pe fiecare dispozitiv care solicit\u0103 desc\u0103rc\u0103ri de fi\u0219iere \u00een cadrul unei re\u021bele, dar sunt, de asemenea, folosite pentru a trimite cereri c\u0103tre internetul public.<\/p>\n<p><strong>Alte tipuri de noduri<\/strong><\/p>\n<p>\u00centr-o re\u021bea de cablu TV pe baz\u0103 de fibr\u0103, nodurile sunt casele \u0219i \/ sau \u00eentreprinderile care sunt conectate la acela\u0219i receptor de fibr\u0103 optic\u0103.<\/p>\n<p>Un alt exemplu de nod este un dispozitiv care ofer\u0103 servicii de re\u021bea inteligente \u00eentr-o re\u021bea celular\u0103, cum ar fi un controler de sta\u021bie (BSC) sau un Gateway GPRS Support Note(GGSN). Cu alte cuvinte, nodul celular este cel ce ofer\u0103 controalele software din spatele echipamentului celular, cum ar fi structura de antene care sunt utilizate pentru a transmite semnale c\u0103tre toate dispozitivele din re\u021beaua celular\u0103.<\/p>\n<p>Un supernod este un nod dintr-o re\u021bea peer-to-peer care func\u021bioneaz\u0103 nu numai ca un nod obi\u0219nuit, ci \u0219i ca un server proxy, tot odat\u0103 fiind \u0219i dispozitivul care transmite informa\u021bii altor utilizatori din cadrul re\u021belei P2P. Din acest motiv, supernodurile necesit\u0103 mai mult CPU \u0219i l\u0103\u021bime de band\u0103 dec\u00e2t nodurile obi\u0219nuite.<\/p>\n<p><strong>Ce este termenul de &#8222;End-Node Problem&#8221;?<\/strong><\/p>\n<p>Exist\u0103 un termen numit &#8222;End-Node Problem&#8221; care se refer\u0103 la riscul de securitate care vine odat\u0103 cu utilizatorii care \u00ee\u0219i conecteaz\u0103 computerele sau alte dispozitive \u00eentr-o re\u021bea sensibil\u0103, fizic (la locul de munc\u0103) sau prin cloud (oriunde) folosind acela\u0219i dispozitiv pentru a efectua activit\u0103\u021bi nesecurizate.<\/p>\n<p>C\u00e2teva exemple includ un utilizator final care \u00ee\u0219i ia laptopul de serviciu cu el, \u0219i \u00ee\u0219i verific\u0103 e-mailurile \u00eentr-o re\u021bea nesecurizata cum ar fi la o cafenea sau un utilizator care \u00ee\u0219i conecteaz\u0103 laptopul personal sau telefonul la re\u021beaua Wi-Fi a companiei.<\/p>\n<p>Unul dintre cele mai mari riscuri pentru o re\u021bea corporatist\u0103 este un dispozitiv personal care a fost exploatat \u0219i apoi utilizat \u00een acea re\u021bea. Problema este destul de clar\u0103: dispozitivul amestec\u0103 o re\u021bea poten\u021bial nesecurizat\u0103 \u0219i re\u021beaua de afaceri care con\u021bine probabil date sensibile.<\/p>\n<p>Dispozitivul utilizatorului final ar putea fi infectat cu programe cum ar fi cele de tip keylogger sau programele de transfer de fi\u0219iere care extrag informa\u021bii sensibile sau pot muta malware \u00een re\u021beaua privat\u0103 odat\u0103 ce conexiunea a fost stabilit\u0103.<\/p>\n<p>Exist\u0103 multe modalit\u0103\u021bi de a evita aceast\u0103 problem\u0103, de la VPN-uri \u0219i autentificarea \u00een doi factori la un software special bootabil, care va permite utilizarea numai a anumitor programe.<\/p>\n<p>Cu toate acestea, o alt\u0103 metod\u0103 este de a educa pur \u0219i simplu utilizatorii cu privire la modul de a-\u0219i asigura \u00een mod corespunz\u0103tor dispozitivul. Laptopurile personale pot folosi un program antivirus pentru a p\u0103stra fi\u0219ierele lor protejate \u00eempotriva malware-ului, iar smartphone-urile pot utiliza o aplica\u021bie antimalware similar\u0103 pentru a detecta viru\u0219i \u0219i alte amenin\u021b\u0103ri \u00eenainte de a le face r\u0103u.<\/p>\n<p><strong>Alte semnifica\u021bii ale nodurilor<\/strong><\/p>\n<p>Nodul este, de asemenea, cuv\u00e2ntul folosit pentru a descrie un fi\u0219ier de computer atunci c\u00e2nd se refer\u0103 la o structur\u0103 de date arborescent\u0103. La fel ca un copac adev\u0103rat \u00een care ramurile \u00ee\u0219i p\u0103streaz\u0103 frunzele, folderele din cadrul unei structuri de date \u00ee\u0219i p\u0103streaz\u0103 propriile fi\u0219iere. Fi\u0219ierele ar putea fi numite frunze sau noduri de frunze.<\/p>\n<p>Cuv\u00e2ntul &#8222;nod&#8221; este folosit \u0219i cu node.js, care este un mediu de rulare JavaScript folosit pentru executarea codului JavaScript din partea unui server. &#8222;Js&#8221; din node.js nu se refer\u0103 la extensia de fi\u0219ier JS utilizat\u0103 cu fi\u0219iere JavaScript, ci este doar numele instrumentului.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Un nod este orice dispozitiv fizic dintr-o re\u021bea de alte dispozitive care poate trimite, primi \u0219i da mai departe informa\u021bii. Computerul este cel mai des \u00eent\u00e2lnit nod \u0219i se nume\u0219te adesea nodul computerului sau nodul de internet. Modem-urile, switch-urile, hub-urile, serverele \u0219i imprimantele sunt, de asemenea, noduri, la fel ca \u0219i alte dispozitive care se<\/p>\n","protected":false},"author":1,"featured_media":1033,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[152],"tags":[],"class_list":["post-736","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-data-room"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Nodurile dintr-o re\u021bea de calculatoare explicate - NAV.RO Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.nav.ro\/blog\/nodurile-dintr-o-retea-de-calculatoare-explicate\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Nodurile dintr-o re\u021bea de calculatoare explicate - NAV.RO Blog\" \/>\n<meta property=\"og:description\" content=\"Un nod este orice dispozitiv fizic dintr-o re\u021bea de alte dispozitive care poate trimite, primi \u0219i da mai departe informa\u021bii. 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