<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageWikiLinkText>	"Network Time Protokolu"@cs .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageWikiLink>	<http://cs.dbpedia.org/resource/Stratum> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageExternalLink>	<http://www.galleon.eu.com/> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageWikiLink>	<http://cs.dbpedia.org/resource/OpenBSD> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/abstract>	"NTP (Network Time Protocol) je protokol pro synchronizaci vnit\u0159n\u00EDch hodin po\u010D\u00EDta\u010D\u016F po paketov\u00E9 s\u00EDti s prom\u011Bnn\u00FDm zpo\u017Ed\u011Bn\u00EDm. Tento protokol zaji\u0161\u0165uje, aby v\u0161echny po\u010D\u00EDta\u010De v s\u00EDti m\u011Bly stejn\u00FD a p\u0159esn\u00FD \u010Das. Byl obzvl\u00E1\u0161t\u011B navr\u017Een tak, aby odol\u00E1val n\u00E1sledku prom\u011Bnliv\u00E9ho zpo\u017Ed\u011Bn\u00ED v doru\u010Dov\u00E1n\u00ED paket\u016F.NTP pou\u017E\u00EDv\u00E1 User Datagram Protocol (UDP) na portu 123.NTP klient pou\u017E\u00EDv\u00E1 Marzull\u016Fv algoritmus pro stanoven\u00ED \u010Dasu z (nepatrn\u011B) se li\u0161\u00EDc\u00EDch odpov\u011Bd\u00ED \u010Dasov\u00FDch server\u016F. Pou\u017E\u00EDv\u00E1 se \u010Das UTC se speci\u00E1ln\u00EDmi p\u0159\u00EDznaky pro p\u0159estupn\u00E9 sekundy. NTP verze 4 obvykle dovede po internetu udr\u017Eovat \u010Das s chybou pod 10 milisekund (1/100 s), v lok\u00E1ln\u00ED s\u00EDti m\u016F\u017Ee p\u0159i ide\u00E1ln\u00EDch podm\u00EDnk\u00E1ch dos\u00E1hnout p\u0159esnosti a\u017E 200 mikrosekund (1/5000 s).Po\u010D\u00EDta\u010D, kter\u00FD chce synchronizovat sv\u00E9 hodiny, po\u0161le p\u00E1r dotaz\u016F n\u011Bkolika NTP server\u016Fm a ty mu v odpov\u011Bdi po\u0161lou sv\u016Fj, p\u0159esn\u00FD \u010Das. Klient z odpov\u011Bd\u00ED nejprve vylou\u010D\u00ED servery se z\u0159ejm\u011B nesmysln\u00FDm \u010Dasem (s odchylkou 1000 sekund a v\u00EDce). Pot\u00E9 ponech\u00E1 skupinu server\u016F s nejv\u011Bt\u0161\u00EDm spole\u010Dn\u00FDm pr\u016Fnikem.B\u011B\u017En\u011B se j\u00EDm dosahuje p\u0159esnosti hodin v \u0159\u00E1du milisekund.NTP je jeden z nejstar\u0161\u00EDch dosud pou\u017E\u00EDvan\u00FDch IP protokol\u016F.NTP p\u016Fvodn\u011B navrhl Dave Mills z univerzity v Delaware a st\u00E1le jej, spolu se skupinou dobrovoln\u00EDk\u016F, udr\u017Euje.Sou\u010Dasn\u00E1 verze je NTP verze 4, kterou popisuje RFC 5905.NTP d\u00E9mon je u\u017Eivatelsk\u00FD proces, kter\u00FD na stroji b\u011B\u017E\u00ED trvale. V\u011Bt\u0161ina protokolu a inteligence je implementov\u00E1na v tomto procesu. Pro dosa\u017Een\u00ED nejlep\u0161\u00EDho v\u00FDkonu je d\u016Fle\u017Eit\u00E9, aby j\u00E1dro opera\u010Dn\u00EDho syst\u00E9mu um\u011Blo \u0159\u00EDdit \u010Das f\u00E1zov\u00FDm z\u00E1v\u011Bsem, m\u00EDsto aby p\u0159esn\u00FD \u010Das do syst\u00E9mov\u00FDch hodin dosazoval NTP d\u00E9mon p\u0159\u00EDmo. V\u0161echny dne\u0161n\u00ED verze Linuxu f\u00E1zov\u00FD z\u00E1v\u011Bs implementuj\u00ED.NTP pou\u017E\u00EDv\u00E1 hierarchick\u00FD syst\u00E9m \u201Estrata hodin\u201C, kde syst\u00E9my se stratem 1 jsou synchronizov\u00E1ny s p\u0159esn\u00FDmi extern\u00EDmi hodinami jako t\u0159eba GPS nebo jin\u00E9 hodiny \u0159\u00EDzen\u00E9 r\u00E1diov\u00FDm sign\u00E1lem (v \u010Cesku obvykle DCF77). NTP syst\u00E9my strata 2 odvozuj\u00ED sv\u016Fj \u010Das od jednoho nebo v\u00EDce syst\u00E9m\u016F se stratem 1 atd. To zabra\u0148uje vzniku cyklu v grafu synchronizuj\u00EDc\u00EDch se stroj\u016F. Stratum syst\u00E9mu le\u017E\u00ED v rozsahu 1 a\u017E 14; stratum 0 maj\u00ED samotn\u00E9 referen\u010Dn\u00ED hodiny p\u0159ipojen\u00E9 k nejp\u0159esn\u011Bj\u0161\u00EDmu serveru; stratum 15 m\u00E1 po\u010D\u00EDta\u010D, kter\u00FD se v d\u016Fsledku v\u00FDpadku s\u00EDt\u011B nem\u016F\u017Ee synchronizovat s zdrojem \u010Dasu, nebo se synchronizuje po v\u00FDpadku spojen\u00ED. (Je dobr\u00E9 si v\u0161imnout, \u017Ee stratum hodin v telekomunika\u010Dn\u00EDch syst\u00E9mech je odli\u0161n\u00FD pojem.) NTP udr\u017Euje a zna\u010Dkuje \u010Das v UTC ve form\u011B \u010D\u00EDsla s pevnou desetinnou \u010D\u00E1rkou: 32 bit\u016F na \u010D\u00E1st sekund + 32 bit\u016F desetinn\u00E1 \u010D\u00E1st sekund. To NTP d\u00E1v\u00E1 \u0161k\u00E1lu 232 sekund s teoretick\u00FDm rozli\u0161en\u00EDm 2-32 sekundy. A\u010Dkoliv NTP \u0161k\u00E1la p\u0159et\u00E9k\u00E1 ka\u017Ed\u00FDch 232 sekund, implementace by m\u011Bla odstranit nejednozna\u010Dnost z jin\u00FDch zdroj\u016F. Proto\u017Ee k tomu sta\u010D\u00ED \u010Das p\u0159esn\u00FD na n\u011Bkolik desetilet\u00ED, pro b\u011B\u017En\u00E9 pou\u017Eit\u00ED to nen\u00ED probl\u00E9m.Jednodu\u0161\u0161\u00ED forma NTP je zn\u00E1m\u00E1 jako Simple Network Time Protocol nebo SNTP. SNTP klient neuva\u017Euje zpo\u017Ed\u011Bn\u00ED paket\u016F v s\u00EDti a nepamatuje si stav p\u0159edchoz\u00ED komunikace. Pou\u017E\u00EDv\u00E1 se ve vestav\u011Bn\u00FDch za\u0159\u00EDzen\u00EDch a v aplikac\u00EDch, kter\u00E9 nepot\u0159ebuj\u00ED tak extr\u00E9mn\u011B vysokou p\u0159esnost. Viz RFC 1361, 1769 a 2030.Detaily provozu NTP popisuj\u00ED RFC 778, 891, 956, 958 a 1305. (Nezam\u011B\u0148ujte NTP s protokoly daytime (RFC 867) nebo time (RFC 868).)Nicm\u00E9n\u011B k roku 2005 bylo v RFC dokumentov\u00E1no NTP jen do verze 4. Aby se standardizovala d\u00EDlo NTP komunity od doby RFC 1305 a jin\u00FDch, zformovala se IETF NTP Working Group.Krom\u011B referen\u010Dn\u00ED, softwarov\u00E9 implementace NTP, kter\u00E1 je k nalezen\u00ED na domovsk\u00E9 str\u00E1nce NTP a kter\u00E1 byla portov\u00E1na na v\u011Bt\u0161inu obl\u00EDben\u00FDch opera\u010Dn\u00EDch syst\u00E9m\u016F, mnoho v\u00FDrobc\u016F, jako Symmetricom, Elproma, Meinberg, FEI-Zyfer a jin\u00ED, nab\u00EDz\u00ED samostatn\u00E9 (tj. vyhrazen\u00E9) \u010Dasov\u00E9 servery."@cs .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageWikiLinkText>	"NTP"@cs .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageRevisionID>	"16393141"^^<http://www.w3.org/2001/XMLSchema#integer> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageExternalLink>	<http://www.symmetricom.com> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageWikiLink>	<http://cs.dbpedia.org/resource/Protokol_(informatika)> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageExternalLink>	<http://www.openntpd.org/> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageWikiLink>	<http://cs.dbpedia.org/resource/Hodiny> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageWikiLink>	<http://cs.dbpedia.org/resource/Coordinated_Universal_Time> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageWikiLink>	<http://cs.dbpedia.org/resource/S\u00ED\u0165ov\u00FD_port> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://purl.org/dc/terms/subject>	<http://cs.dbpedia.org/resource/Kategorie:Aplika\u010Dn\u00ED_protokoly_IP> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageWikiLink>	<http://cs.dbpedia.org/resource/Kategorie:Aplika\u010Dn\u00ED_protokoly_IP> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageExternalLink>	<http://www.fei-zyfer.com/> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageWikiLink>	<http://cs.dbpedia.org/resource/F\u00E1zov\u00FD_z\u00E1v\u011Bs> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageWikiLink>	<http://cs.dbpedia.org/resource/Synchronizace> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageWikiLink>	<http://cs.dbpedia.org/resource/P\u0159esn\u00FD_\u010Das> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageExternalLink>	<http://www.boulder.nist.gov/timefreq/general/softwarelist.htm> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageWikiLink>	<http://cs.dbpedia.org/resource/Opera\u010Dn\u00ED_syst\u00E9m> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageWikiLink>	<http://cs.dbpedia.org/resource/RFC> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageWikiLink>	<http://cs.dbpedia.org/resource/2005> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageExternalLink>	<http://www.fei-zyfer.com> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://cs.dbpedia.org/property/wikiPageUsesTemplate>	<http://cs.dbpedia.org/resource/\u0160ablona:Internetov\u00E9_protokoly> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageID>	"12759"^^<http://www.w3.org/2001/XMLSchema#integer> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageWikiLink>	<http://cs.dbpedia.org/resource/Internet> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageExternalLink>	<http://nts.softros.com/> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageOutDegree>	"30"^^<http://www.w3.org/2001/XMLSchema#nonNegativeInteger> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageExternalLink>	<http://chrony.sunsite.dk/> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://cs.wikipedia.org/wiki/Network_Time_Protocol?oldid=16393141> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageExternalLink>	<https://web.archive.org/web/20080417204858/http:/www.ietf.org/html.charters/ntp-charter.html> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageExternalLink>	<http://www.ntp.org> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageExternalLink>	<http://www.oscilloquartz.com/ntp/> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageExternalLink>	<http://www.eecis.udel.edu/~mills/> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageWikiLink>	<http://cs.dbpedia.org/resource/User_Datagram_Protocol> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageLength>	"5654"^^<http://www.w3.org/2001/XMLSchema#nonNegativeInteger> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://www.w3.org/2000/01/rdf-schema#label>	"Network Time Protocol"@cs .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageWikiLink>	<http://cs.dbpedia.org/resource/Dave_Mills> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageExternalLink>	<http://www.ntp-servers.com/> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageWikiLink>	<http://cs.dbpedia.org/resource/Linux> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://www.w3.org/2000/01/rdf-schema#comment>	"NTP (Network Time Protocol) je protokol pro synchronizaci vnit\u0159n\u00EDch hodin po\u010D\u00EDta\u010D\u016F po paketov\u00E9 s\u00EDti s prom\u011Bnn\u00FDm zpo\u017Ed\u011Bn\u00EDm. Tento protokol zaji\u0161\u0165uje, aby v\u0161echny po\u010D\u00EDta\u010De v s\u00EDti m\u011Bly stejn\u00FD a p\u0159esn\u00FD \u010Das. Byl obzvl\u00E1\u0161t\u011B navr\u017Een tak, aby odol\u00E1val n\u00E1sledku prom\u011Bnliv\u00E9ho zpo\u017Ed\u011Bn\u00ED v doru\u010Dov\u00E1n\u00ED paket\u016F.NTP pou\u017E\u00EDv\u00E1 User Datagram Protocol (UDP) na portu 123.NTP klient pou\u017E\u00EDv\u00E1 Marzull\u016Fv algoritmus pro stanoven\u00ED \u010Dasu z (nepatrn\u011B) se li\u0161\u00EDc\u00EDch odpov\u011Bd\u00ED \u010Dasov\u00FDch server\u016F."@cs .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageWikiLinkText>	"NTP (Network Time Protocol)"@cs .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageWikiLink>	<http://cs.dbpedia.org/resource/\u010Cesko> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageExternalLink>	<http://www.ntp.org/> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageWikiLink>	<http://cs.dbpedia.org/resource/Daytime> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageWikiLink>	<http://cs.dbpedia.org/resource/DCF77> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageExternalLink>	<http://phoenix.inf.upol.cz/~bazgierv/ntp.html> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageWikiLinkText>	"Network Time Protocol"@cs .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageWikiLink>	<http://cs.dbpedia.org/resource/Paket> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageExternalLink>	<http://www.timefreq.com> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageExternalLink>	<http://www.arachnoid.com/abouttime/> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageExternalLink>	<http://www.meinberg.de/english/> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageWikiLink>	<http://cs.dbpedia.org/resource/Po\u010D\u00EDta\u010D> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageWikiLink>	<http://cs.dbpedia.org/resource/Server> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageWikiLink>	<http://cs.dbpedia.org/resource/P\u0159estupn\u00E1_sekunda> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageWikiLink>	<http://cs.dbpedia.org/resource/Marzull\u016Fv_algoritmus> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageWikiLink>	<http://cs.dbpedia.org/resource/Unix> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageWikiLink>	<http://cs.dbpedia.org/resource/Sekunda> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://xmlns.com/foaf/0.1/isPrimaryTopicOf>	<http://cs.wikipedia.org/wiki/Network_Time_Protocol> .
<http://cs.dbpedia.org/resource/Network_Time_Protocol>	<http://dbpedia.org/ontology/wikiPageWikiLink>	<http://cs.dbpedia.org/resource/Global_Positioning_System> .