01022nam a2200217Ia 4500 CTU_232448 210402s9999 xx 000 0 und d 004.62 B627 Black, Uyless D. The X series recommendations : Standards for data communications Uyless D. Black New York McGraw-Hill 1995 A new edition of the authoritative source on X.2 facilities, X.1 service, X.25, X.28, and X.29 PAD protocols, internetworking with packet networks and ISDN, telephone and satellite networks, and all X.500 directory applications. Black updates the X series, and the new CCITT X series, embellishing and improving the X.200 recommendations, and adding explanations of APIs and upper level protocols. Giao thức mạng máy tính,Computer network protocols Tiêu chuẩn,Standards dqhieu Trung tâm Học liệu Trường Đại học Cần Thơ