{"id":587,"date":"2020-04-08T19:46:14","date_gmt":"2020-04-08T17:46:14","guid":{"rendered":"http:\/\/tech.sosthe.sk\/?page_id=587"},"modified":"2020-04-08T20:02:14","modified_gmt":"2020-04-08T18:02:14","slug":"telnet","status":"publish","type":"page","link":"http:\/\/tech.sosthe.sk\/index.php\/odborne-predmety\/pocitacove-systemy\/telnet\/","title":{"rendered":"Telnet"},"content":{"rendered":"

Telnet<\/strong> (n\u00e1zov je skratkou slov tel<\/strong>etype over net<\/strong>work, slovensky teda \u010falekopis pripojen\u00fd po sieti) je meno komunika\u010dn\u00e9ho protokolu v po\u010d\u00edta\u010dovej sieti Internet, v\u010faka ktor\u00e9mu sa u\u017e\u00edvate\u013e m\u00f4\u017ee pripoji\u0165 k vzdialen\u00e9mu serveru. Telnet funguje na pomyselne najvy\u0161\u0161ie umiestnenej aplika\u010dnej vrstve (Application Layer) v architekt\u00fare protokolu TCP\/IP .<\/p>\n

Prv\u00fd krok vo v\u00fdvoji telnetu bol uroben\u00fd u\u017e na konci 60. rokov minul\u00e9ho storo\u010dia a protokol bol \u0161tandardizovan\u00fd ako jeden z prv\u00fdch zo v\u0161etk\u00fdch dnes zn\u00e1mych internetov\u00fdch \u0161tandardov. Telnet ofici\u00e1lne vyu\u017e\u00edva \u010di tzv. „na\u010d\u00fava“ v r\u00e1mci TCP na sie\u0165ovom porte 23<\/strong><\/em>.<\/p>\n

Pre spr\u00e1vnu funk\u010dnos\u0165 protokolu sa predpoklad\u00e1 model klient-server. Kedy klient je na tzv. fyzickom po\u010d\u00edta\u010di a server je na vzdialenom po\u010d\u00edta\u010di (kam sa u\u017e\u00edvate\u013e chce prihl\u00e1si\u0165).<\/p>\n

Preto\u017ee telnet pracuje na textovej b\u00e1ze, \u010di\u017ee sa jedn\u00e1 o textov\u00fd termin\u00e1l s ne\u0161ifrovanou d\u00e1tovou komunik\u00e1ciou, tak je dnes nahraden\u00fd, pre vy\u0161\u0161\u00ed stupe\u0148 zabezpe\u010denia, \u0161ifrovan\u00fdm protokolom s n\u00e1zvom SSH<\/strong> (Secure Shell). Telnet sa v s\u00fa\u010dasnosti pou\u017e\u00edva len na nastavovanie niektor\u00fdch sie\u0165ov\u00fdch alebo priemyseln\u00fdch zariaden\u00ed cez tzv. konzolu (termin\u00e1l RS232).<\/p>\n

Pod slovom telnet<\/strong><\/em> sa tie\u017e rozumie program, ktor\u00fd \u00faspe\u0161ne dopom\u00e1ha ku komunik\u00e1cii medzi dvoma po\u010d\u00edta\u010dmi v r\u00e1mci rovnomenn\u00e9ho protokolu. Sp\u00fa\u0161\u0165a sa z pr\u00edkazov\u00e9ho riadku (Windows, Linux…) a sl\u00fa\u017ei k spojeniu po\u010d\u00edta\u010dov v sieti TCP\/IP. Oproti in\u00fdm grafick\u00fdm klientom je ihne\u010f vidie\u0165 odozvu protistrany (servera, ku ktor\u00e9mu sa prihlasujeme), a t\u00fdm m\u00f4\u017eeme jednoducho zisti\u0165 potenci\u00e1lny probl\u00e9m.
\nVo Windows sa sp\u00fa\u0161\u0165a z pr\u00edkazov\u00e9ho riadku (cmd.exe). Ten spust\u00edte tak, \u017ee pomocou kl\u00e1vesovej skratky Win + R<\/em> otvor\u00edte dial\u00f3g Spusti\u0165, do neho zad\u00e1te cmd<\/em> a kliknete na OK. Zobraz\u00ed sa okno pr\u00edkazov\u00e9ho riadku, kde spust\u00edme pr\u00edkaz telnet<\/em> na pripojenie k in\u00e9mu serveru.<\/p>\n

Pou\u017eitie:<\/p>\n

c:\\Users\\admin\\telnet \"IPadresa alebo dom\u00e9nov\u00e9 meno\" \"\u010d\u00edslo_portu\"<\/em><\/span><\/pre>\n
Pr\u00edklad pre testovanie http:<\/p>\n
\"\"ukon\u010denie rel\u00e1cie je pr\u00edkazom „q“ (quit).<\/p>\n
Vo Windows od verzie Vista vy\u0161\u0161ie nie je telnet<\/em> v syst\u00e9me \u0161tandardne pr\u00edtomn\u00fd, je potrebn\u00e9 ho doin\u0161talova\u0165.<\/p>\n
    \n
  • Kliknite na ponuku \u0160tart a vyberte Ovl\u00e1dac\u00ed panel (m\u00f4\u017ee by\u0165 v polo\u017eke Syst\u00e9m vo Windows 10).<\/li>\n
  • V Ovl\u00e1dacom paneli kliknite na polo\u017eku „Programy a s\u00fa\u010dasti“ a vyberte „Zapn\u00fa\u0165 alebo vypn\u00fa\u0165 s\u00fa\u010dasti Windows“ .<\/li>\n
  • V z\u00e1vislosti na parametroch V\u00e1\u0161ho pou\u017e\u00edvate\u013esk\u00e9ho \u00fa\u010dtu a nastavenia zabezpe\u010den\u00ed Windows bud\u00fa mo\u017eno vy\u017eadovan\u00e9 administr\u00e1torsk\u00e9 opr\u00e1vnenia.<\/li>\n
  • V zozname dostupn\u00fdch programov n\u00e1jdete polo\u017eku „Klient slu\u017eby Telnet“ a kliknut\u00edm na zaklik\u00e1vacie pol\u00ed\u010dko ju vyberte k in\u0161tal\u00e1cii.<\/li>\n<\/ul>\n
    \"\"<\/p>\n
    V linuxe m\u00f4\u017eete pou\u017ei\u0165 \u013eubovo\u013en\u00fd termin\u00e1lov\u00fd program – xterm, konzola at\u010f.<\/p>\n
     <\/p>\n","protected":false},"excerpt":{"rendered":"
    Telnet (n\u00e1zov je skratkou slov teletype over network, slovensky teda \u010falekopis pripojen\u00fd po sieti) je meno komunika\u010dn\u00e9ho protokolu v po\u010d\u00edta\u010dovej sieti Internet, v\u010faka ktor\u00e9mu sa…<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":13,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"_links":{"self":[{"href":"http:\/\/tech.sosthe.sk\/index.php\/wp-json\/wp\/v2\/pages\/587"}],"collection":[{"href":"http:\/\/tech.sosthe.sk\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"http:\/\/tech.sosthe.sk\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"http:\/\/tech.sosthe.sk\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/tech.sosthe.sk\/index.php\/wp-json\/wp\/v2\/comments?post=587"}],"version-history":[{"count":6,"href":"http:\/\/tech.sosthe.sk\/index.php\/wp-json\/wp\/v2\/pages\/587\/revisions"}],"predecessor-version":[{"id":595,"href":"http:\/\/tech.sosthe.sk\/index.php\/wp-json\/wp\/v2\/pages\/587\/revisions\/595"}],"up":[{"embeddable":true,"href":"http:\/\/tech.sosthe.sk\/index.php\/wp-json\/wp\/v2\/pages\/13"}],"wp:attachment":[{"href":"http:\/\/tech.sosthe.sk\/index.php\/wp-json\/wp\/v2\/media?parent=587"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}