{"id":31,"date":"2020-05-12T23:03:24","date_gmt":"2020-05-12T20:03:24","guid":{"rendered":"https:\/\/blogs.e-me.edu.gr\/hive-diktya-ypologistvn-eneegyl-eyboias\/?p=31"},"modified":"2020-05-12T23:03:24","modified_gmt":"2020-05-12T20:03:24","slug":"%ce%b4%ce%b9%ce%b5%cf%85%ce%b8%cf%85%ce%bd%cf%83%ce%b9%ce%bf%ce%b4%cf%8c%cf%84%ce%b7%cf%83%ce%b7-internet-protocol-%ce%ad%ce%ba%ce%b4%ce%bf%cf%83%ce%b7-4-ipv4","status":"publish","type":"post","link":"https:\/\/blogs.e-me.edu.gr\/hive-diktya-ypologistvn-eneegyl-eyboias\/2020\/05\/12\/%ce%b4%ce%b9%ce%b5%cf%85%ce%b8%cf%85%ce%bd%cf%83%ce%b9%ce%bf%ce%b4%cf%8c%cf%84%ce%b7%cf%83%ce%b7-internet-protocol-%ce%ad%ce%ba%ce%b4%ce%bf%cf%83%ce%b7-4-ipv4\/","title":{"rendered":"\u0394\u03b9\u03b5\u03c5\u03b8\u03c5\u03bd\u03c3\u03b9\u03bf\u03b4\u03cc\u03c4\u03b7\u03c3\u03b7 Internet Protocol \u03ad\u03ba\u03b4\u03bf\u03c3\u03b7 4 (IPv4)"},"content":{"rendered":"<p>\u03a4\u03bf \u03b5\u03c0\u03af\u03c0\u03b5\u03b4\u03bf \u0394\u03b9\u03ba\u03c4\u03cd\u03bf\u03c5 (Network layer) \u03c3\u03c4\u03bf \u03bc\u03bf\u03bd\u03c4\u03ad\u03bb\u03bf OSI \u03ae \u03c4\u03bf \u03b1\u03bd\u03c4\u03af\u03c3\u03c4\u03bf\u03b9\u03c7\u03bf \u0394\u03b9\u03b1\u03b4\u03b9\u03ba\u03c4\u03cd\u03bf\u03c5 \u03c4\u03bf\u03c5 TCP\/IP \u03c0\u03b1\u03c1\u03ad\u03c7\u03b5\u03b9 \u03c4\u03b7 \u03bb\u03bf\u03b3\u03b9\u03ba\u03ae \u03b4\u03b9\u03b5\u03c5\u03b8\u03c5\u03bd\u03c3\u03b9\u03bf\u03b4\u03cc\u03c4\u03b7\u03c3\u03b7 \u03b3\u03b9\u03b1 \u03cc\u03bb\u03b1 \u03c4\u03b1 \u03b4\u03b9\u03b1\u03c3\u03c5\u03bd\u03b4\u03b5\u03b4\u03b5\u03bc\u03ad\u03bd\u03b1 \u03bc\u03b5\u03c4\u03b1\u03be\u03cd \u03c4\u03bf\u03c5\u03c2 \u03b4\u03af\u03ba\u03c4\u03c5\u03b1. \u03a6\u03c1\u03bf\u03bd\u03c4\u03af\u03b6\u03b5\u03b9 \u03b3\u03b9\u03b1 \u03c4\u03b7\u03bd \u03b5\u03cd\u03c1\u03b5\u03c3\u03b7 \u03c4\u03b7\u03c2 \u03ba\u03b1\u03c4\u03ac\u03bb\u03bb\u03b7\u03bb\u03b7\u03c2 \u03b4\u03b9\u03b1\u03b4\u03c1\u03bf\u03bc\u03ae\u03c2 \u03ba\u03b1\u03b9 \u03c0\u03b1\u03c1\u03ac\u03b4\u03bf\u03c3\u03b7 \u03c4\u03bf\u03c5 \u03c0\u03b1\u03ba\u03ad\u03c4\u03bf\u03c5 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03c9\u03bd \u03c3\u03c4\u03bf\u03bd \u03c4\u03b5\u03bb\u03b9\u03ba\u03cc \u03ba\u03cc\u03bc\u03b2\u03bf, \u03ad\u03c1\u03b3\u03bf \u03c4\u03bf \u03bf\u03c0\u03bf\u03af\u03bf \u03c7\u03b1\u03c1\u03b1\u03ba\u03c4\u03b7\u03c1\u03af\u03b6\u03b5\u03c4\u03b1\u03b9 \u03c9\u03c2 \u03b4\u03c1\u03bf\u03bc\u03bf\u03bb\u03cc\u03b3\u03b7\u03c3\u03b7 (routing). \u03a3\u03c4\u03b7\u03bd \u03c0\u03c1\u03bf\u03c3\u03c0\u03ac\u03b8\u03b5\u03b9\u03b1 \u03b1\u03c5\u03c4\u03ae \u03c4\u03bf \u03c0\u03b1\u03ba\u03ad\u03c4\u03bf \u03bc\u03c0\u03bf\u03c1\u03b5\u03af \u03bd\u03b1 \u03c7\u03c1\u03b5\u03b9\u03b1\u03c3\u03c4\u03b5\u03af \u03bd\u03b1 \u03b4\u03b9\u03b1\u03c3\u03c0\u03b1\u03c3\u03c4\u03b5\u03af \u03c3\u03b5 \u03b4\u03b9\u03ac\u03c6\u03bf\u03c1\u03b1 \u03c4\u03bc\u03ae\u03bc\u03b1\u03c4\u03b1 \u03c4\u03b1 \u03bf\u03c0\u03bf\u03af\u03b1 \u03bc\u03c0\u03bf\u03c1\u03b5\u03af \u03bd\u03b1 \u03c6\u03c4\u03ac\u03c3\u03bf\u03c5\u03bd \u03b1\u03c0\u03cc \u03ac\u03bb\u03bb\u03b5\u03c2 \u03b4\u03b9\u03b1\u03b4\u03c1\u03bf\u03bc\u03ad\u03c2 \u03ba\u03b1\u03b9 \u03bc\u03b5 \u03b4\u03b9\u03b1\u03c6\u03bf\u03c1\u03b5\u03c4\u03b9\u03ba\u03ae \u03c3\u03b5\u03b9\u03c1\u03ac, \u03cc\u03bc\u03c9\u03c2 \u03c4\u03bf \u03b5\u03c0\u03af\u03c0\u03b5\u03b4\u03bf \u03b4\u03b9\u03ba\u03c4\u03cd\u03bf\u03c5 \u03b8\u03b1 \u03c4\u03b1 \u03b5\u03c0\u03b1\u03bd\u03b1\u03c3\u03c5\u03bd\u03b8\u03ad\u03c3\u03b5\u03b9 \u03ba\u03b1\u03b9 \u03b8\u03b1 \u03b1\u03bd\u03b1\u03c6\u03ad\u03c1\u03b5\u03b9 \u03bf\u03c0\u03bf\u03b9\u03b1\u03b4\u03ae\u03c0\u03bf\u03c4\u03b5 \u03c0\u03c1\u03bf\u03b2\u03bb\u03ae\u03bc\u03b1\u03c4\u03b1 \u03c0\u03b1\u03c1\u03ac\u03b4\u03bf\u03c3\u03b7\u03c2 \u03c0\u03c1\u03bf\u03ba\u03cd\u03c8\u03bf\u03c5\u03bd. \u03a4\u03bf \u03b5\u03c0\u03af\u03c0\u03b5\u03b4\u03bf \u0394\u03b9\u03b1\u03b4\u03b9\u03ba\u03c4\u03cd\u03bf\u03c5 \u03c3\u03c4\u03bf \u03bc\u03bf\u03bd\u03c4\u03ad\u03bb\u03bf TCP\/IP \u03ad\u03c7\u03b5\u03b9 \u03c9\u03c2 \u03b2\u03b1\u03c3\u03b9\u03ba\u03cc \u03c0\u03c1\u03c9\u03c4\u03cc\u03ba\u03bf\u03bb\u03bb\u03bf \u03c4\u03bf \u03c0\u03c1\u03c9\u03c4\u03cc\u03ba\u03bf\u03bb\u03bb\u03bf \u0394\u03b9\u03b1\u03b4\u03b9\u03ba\u03c4\u03cd\u03bf\u03c5 (Internet Protocol - IP) \u03c4\u03bf \u03bf\u03c0\u03bf\u03af\u03bf \u03c0\u03b1\u03c1\u03ad\u03c7\u03b5\u03b9 \u03c5\u03c0\u03b7\u03c1\u03b5\u03c3\u03af\u03b5\u03c2 \u03b1\u03c0\u03bf\u03ba\u03bb\u03b5\u03b9\u03c3\u03c4\u03b9\u03ba\u03ac \u03c7\u03c9\u03c1\u03af\u03c2 \u03c3\u03cd\u03bd\u03b4\u03b5\u03c3\u03b7. \u0393\u03b9\u03b1 \u03c4\u03bf \u03c3\u03ba\u03bf\u03c0\u03cc \u03b1\u03c5\u03c4\u03cc \u03c7\u03c1\u03b7\u03c3\u03b9\u03bc\u03bf\u03c0\u03bf\u03b9\u03b5\u03af \u03b1\u03c5\u03c4\u03bf\u03b4\u03cd\u03bd\u03b1\u03bc\u03b1 \u03c0\u03b1\u03ba\u03ad\u03c4\u03b1 IP \u03c4\u03b1 \u03bf\u03c0\u03bf\u03af\u03b1 \u03bf\u03bd\u03bf\u03bc\u03ac\u03b6\u03bf\u03bd\u03c4\u03b1\u03b9 datagram (= data + telegram).<\/p>\n<p>\u03a3\u03c4\u03bf \u03b5\u03c0\u03af\u03c0\u03b5\u03b4\u03bf \u0394\u03b9\u03b1\u03b4\u03b9\u03ba\u03c4\u03cd\u03bf\u03c5, \u03b5\u03ba\u03c4\u03cc\u03c2 \u03b1\u03c0\u03cc \u03c4\u03bf \u03b2\u03b1\u03c3\u03b9\u03ba\u03cc \u03c0\u03c1\u03c9\u03c4\u03cc\u03ba\u03bf\u03bb\u03bb\u03bf \u0394\u03b9\u03b1\u03b4\u03b9\u03ba\u03c4\u03cd\u03bf\u03c5 IP, \u03bb\u03b5\u03b9\u03c4\u03bf\u03c5\u03c1\u03b3\u03b5\u03af \u03c4\u03bf \u03c0\u03c1\u03c9\u03c4\u03cc\u03ba\u03bf\u03bb\u03bb\u03bf \u03bc\u03b7\u03bd\u03c5\u03bc\u03ac\u03c4\u03c9\u03bd \u03b5\u03bb\u03ad\u03b3\u03c7\u03bf\u03c5 \u0394\u03b9\u03b1\u03b4\u03b9\u03ba\u03c4\u03cd\u03bf\u03c5 (Internet Control Message Protocol - ICMP) \u03ba\u03b1\u03b9 \u03c4\u03bf \u03c0\u03c1\u03c9\u03c4\u03cc\u03ba\u03bf\u03bb\u03bb\u03bf \u03b4\u03b9\u03b1\u03c7\u03b5\u03af\u03c1\u03b9\u03c3\u03b7\u03c2 \u03bf\u03bc\u03ac\u03b4\u03c9\u03bd \u0394\u03b9\u03b1\u03b4\u03b9\u03ba\u03c4\u03cd\u03bf\u03c5 (Internet Group Management Protocol - IGMP). \u03a4\u03b1 \u03c0\u03c1\u03c9\u03c4\u03cc\u03ba\u03bf\u03bb\u03bb\u03b1 ICMP \u03ba\u03b1\u03b9 IGMP \u03c3\u03c5\u03bd\u03ae\u03b8\u03c9\u03c2 \u03b4\u03b5 \u03c7\u03c1\u03b7\u03c3\u03b9\u03bc\u03bf\u03c0\u03bf\u03b9\u03bf\u03cd\u03bd\u03c4\u03b1\u03b9 \u03b1\u03c0\u03cc \u03c4\u03bf\u03c5\u03c2 \u03c7\u03c1\u03ae\u03c3\u03c4\u03b5\u03c2 \u03ba\u03b1\u03b9 \u03c4\u03b9\u03c2 \u03b5\u03c6\u03b1\u03c1\u03bc\u03bf\u03b3\u03ad\u03c2 \u03c4\u03bf\u03c5\u03c2 \u03b1\u03bb\u03bb\u03ac \u03b1\u03c0\u03cc \u03b4\u03b9\u03ba\u03c4\u03c5\u03b1\u03ba\u03ad\u03c2 \u03c3\u03c5\u03c3\u03ba\u03b5\u03c5\u03ad\u03c2 \u03ba\u03b1\u03b9 \u03bb\u03bf\u03b3\u03b9\u03c3\u03bc\u03b9\u03ba\u03cc \u03c3\u03c5\u03c3\u03c4\u03b7\u03bc\u03ac\u03c4\u03c9\u03bd<\/p>\n<p>\u03a4\u03bf ICMP \u03c7\u03c1\u03b7\u03c3\u03b9\u03bc\u03bf\u03c0\u03bf\u03b9\u03b5\u03af\u03c4\u03b1\u03b9 \u03ba\u03c5\u03c1\u03af\u03c9\u03c2 \u03b3\u03b9\u03b1 \u03c4\u03b7\u03bd \u03b1\u03bd\u03b1\u03c6\u03bf\u03c1\u03ac \u03c3\u03c6\u03b1\u03bb\u03bc\u03ac\u03c4\u03c9\u03bd \u03bc\u03b5\u03c4\u03ac\u03b4\u03bf\u03c3\u03b7 \u03b5\u03c1\u03c9\u03c4\u03b7\u03bc\u03ac\u03c4\u03c9\u03bd \u03ba\u03b1\u03b9 \u03b1\u03bd\u03b1\u03bc\u03b5\u03c4\u03ac\u03b4\u03bf\u03c3\u03b7 (relaying) \u03b4\u03b9\u03b1\u03b3\u03bd\u03c9\u03c3\u03c4\u03b9\u03ba\u03ce\u03bd \u03bc\u03b7\u03bd\u03c5\u03bc\u03ac\u03c4\u03c9\u03bd. \u0395\u03be\u03b1\u03af\u03c1\u03b5\u03c3\u03b7 \u03b1\u03c0\u03bf\u03c4\u03b5\u03bb\u03bf\u03cd\u03bd \u03bf\u03b9 \u03b5\u03bd\u03c4\u03bf\u03bb\u03ad\u03c2 ping \u03ba\u03b1\u03b9 traceroute.<br \/>\n\u03a4\u03bf IGMP \u03c7\u03c1\u03b7\u03c3\u03b9\u03bc\u03bf\u03c0\u03bf\u03b9\u03b5\u03af\u03c4\u03b1\u03b9 \u03b3\u03b9\u03b1 \u03c4\u03b7\u03bd \u03bf\u03bc\u03b1\u03b4\u03bf\u03c0\u03bf\u03af\u03b7\u03c3\u03b7 \u03c5\u03c0\u03bf\u03bb\u03bf\u03b3\u03b9\u03c3\u03c4\u03ce\u03bd \u03ba\u03b1\u03b9 \u03b1\u03c0\u03bf\u03c3\u03c4\u03bf\u03bb\u03ae \u03bc\u03b7\u03bd\u03c5\u03bc\u03ac\u03c4\u03c9\u03bd \u03c4\u03b1\u03c5\u03c4\u03cc\u03c7\u03c1\u03bf\u03bd\u03b1 \u03c3\u03b5 \u03cc\u03bb\u03bf\u03c5\u03c2 \u03c4\u03bf\u03c5\u03c2 \u03c5\u03c0\u03bf\u03bb\u03bf\u03b3\u03b9\u03c3\u03c4\u03ad\u03c2 \u03c4\u03b7\u03c2 \u03bf\u03bc\u03ac\u03b4\u03b1\u03c2 (streaming). \u03a3\u03b5 \u03ad\u03bd\u03b1\u03bd \u03c5\u03c0\u03bf\u03bb\u03bf\u03b3\u03b9\u03c3\u03c4\u03ae \u03bc\u03b5 TCP\/IP \u03b7 \u03c5\u03bb\u03bf\u03c0\u03bf\u03af\u03b7\u03c3\u03b7 \u03ba\u03b1\u03b9 \u03c5\u03c0\u03bf\u03c3\u03c4\u03ae\u03c1\u03b9\u03be\u03b7 \u03c4\u03bf\u03c5 ICMP \u03b5\u03af\u03bd\u03b1\u03b9 \u03c5\u03c0\u03bf\u03c7\u03c1\u03b5\u03c9\u03c4\u03b9\u03ba\u03ae \u03b5\u03bd\u03ce \u03c4\u03bf\u03c5 IGMP \u03c0\u03c1\u03bf\u03b1\u03b9\u03c1\u03b5\u03c4\u03b9\u03ba\u03ae.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u03a4\u03bf \u03b5\u03c0\u03af\u03c0\u03b5\u03b4\u03bf \u0394\u03b9\u03ba\u03c4\u03cd\u03bf\u03c5 (Network layer) \u03c3\u03c4\u03bf \u03bc\u03bf\u03bd\u03c4\u03ad\u03bb\u03bf OSI \u03ae \u03c4\u03bf \u03b1\u03bd\u03c4\u03af\u03c3\u03c4\u03bf\u03b9\u03c7\u03bf \u0394\u03b9\u03b1\u03b4\u03b9\u03ba\u03c4\u03cd\u03bf\u03c5 \u03c4\u03bf\u03c5 TCP\/IP \u03c0\u03b1\u03c1\u03ad\u03c7\u03b5\u03b9 \u03c4\u03b7 \u03bb\u03bf\u03b3\u03b9\u03ba\u03ae \u03b4\u03b9\u03b5\u03c5\u03b8\u03c5\u03bd\u03c3\u03b9\u03bf\u03b4\u03cc\u03c4\u03b7\u03c3\u03b7 \u03b3\u03b9\u03b1 \u03cc\u03bb\u03b1 \u03c4\u03b1 \u03b4\u03b9\u03b1\u03c3\u03c5\u03bd\u03b4\u03b5\u03b4\u03b5\u03bc\u03ad\u03bd\u03b1 \u03bc\u03b5\u03c4\u03b1\u03be\u03cd \u03c4\u03bf\u03c5\u03c2 \u03b4\u03af\u03ba\u03c4\u03c5\u03b1. \u03a6\u03c1\u03bf\u03bd\u03c4\u03af\u03b6\u03b5\u03b9 \u03b3\u03b9\u03b1 \u03c4\u03b7\u03bd \u03b5\u03cd\u03c1\u03b5\u03c3\u03b7 \u03c4\u03b7\u03c2 \u03ba\u03b1\u03c4\u03ac\u03bb\u03bb\u03b7\u03bb\u03b7\u03c2 \u03b4\u03b9\u03b1\u03b4\u03c1\u03bf\u03bc\u03ae\u03c2 \u03ba\u03b1\u03b9 \u03c0\u03b1\u03c1\u03ac\u03b4\u03bf\u03c3\u03b7 \u03c4\u03bf\u03c5 \u03c0\u03b1\u03ba\u03ad\u03c4\u03bf\u03c5 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03c9\u03bd \u03c3\u03c4\u03bf\u03bd \u03c4\u03b5\u03bb\u03b9\u03ba\u03cc \u03ba\u03cc\u03bc\u03b2\u03bf, \u03ad\u03c1\u03b3\u03bf \u03c4\u03bf \u03bf\u03c0\u03bf\u03af\u03bf \u03c7\u03b1\u03c1\u03b1\u03ba\u03c4\u03b7\u03c1\u03af\u03b6\u03b5\u03c4\u03b1\u03b9 \u03c9\u03c2 \u03b4\u03c1\u03bf\u03bc\u03bf\u03bb\u03cc\u03b3\u03b7\u03c3\u03b7 (routing). \u03a3\u03c4\u03b7\u03bd \u03c0\u03c1\u03bf\u03c3\u03c0\u03ac\u03b8\u03b5\u03b9\u03b1 \u03b1\u03c5\u03c4\u03ae \u03c4\u03bf \u03c0\u03b1\u03ba\u03ad\u03c4\u03bf \u03bc\u03c0\u03bf\u03c1\u03b5\u03af \u03bd\u03b1 \u03c7\u03c1\u03b5\u03b9\u03b1\u03c3\u03c4\u03b5\u03af &hellip; <\/p>\n<p><a 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