Introduction Single thread for multiple transport protocols Motivation Server design and process structure An iterative example Concurrent multiprotocol servers

 Internet Overview  Internet Layering Architecture  Important Issues in Future Internet Design

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

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

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

1 The first section 2 Exercises 3 Online lecture

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

 6.1 拒绝服务攻击概述  6.2 典型拒绝服务攻击技术  6.3 分布式拒绝服务攻击  6.4 拒绝服务攻击的防御  6.5 分布式拒绝服务攻击的防御  6.6 小结

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 X Focuses on the structure of programs that use RPC, and shows how program can be divided along procedure boundaries Introduces the stub procedure concept and a program generator tool that automates much of the code generation associated with ONC RPC