Introduction Continues the discussion of middleware (i.e., tools and libraries programmers used to construct client-server software) Y Introduces the remote procedure call (RPC) concept, and describes a particular implementation of an rpc that uses XDr standard for data representation

Introduction Examines a de facto standard for external data representation and presentation as well as a set of library procedures used to perform data conversion Describes the general motivations for using an external data representation and the details of one particular implementation

Contents NAME SPACE DOMAIN NAME SPACE DISTRIBUTION OF NAME SPACE DNS IN THE INTERNET RESOLUTION DNS MESSAGES TYPES OF RECORDS COMPRESSION EXAMPLES

Examples Iterative, Connectionless Server (UDP) Iterative, Connected-Oriented Server (TCP) Concurrent. Connection-Oriented Server(TCP)

Consolidating Servers Same motivations for multiprotocol servers Higher risk to use a single, multiservice server, why? Consolidating many services into a single server process reduces the number of executing processes dramatically The total code required

How applications become clients by initiating communication How applications use TCP or UDP protocols to contact a server How they use socket calls to interact with the protocols CSIE, NTUT, Taiwan

Client-Server Model Software Design Concurrent Processing CSIE, NTUT, TAIWAN

Transport layer protocol is to reate a process-to-process communication Provide control mechanisms Provide a connection mechanism for the processes

Course Description Text (required) TCP/IP Protocol Suite, 2nd edition, Behrouz A. Forouzan. Mc Graw-Hill 2003. · Supplementary Texts Internetworking with TCP/IP, Volume 3: Client-Server Programming and Application, Linux-POSIX Sockets Version

案情简介 原告:陈凯,男,52岁。 被告:上海市性教育协会。 1993年4月,原告会同本市部分专家对某中学百余名初中二年级男生进行外生殖器检查,得出患有 各种外生殖器疾病的学生占被检查人数55.24%的结论。上海电视台、《解放日报》《新民晚报》等新闻 媒体对此相继作了大量报道,引起社会较大反响,不少家长带领孩子前往原告所在单位进行检查。 同年6月9日,被告邀请本市部分专家和教师进行座谈,与会人员对原告的检查数据进行讨论并提 出质疑