Commander Paul A. Sohl, USN CDR Sohl was born in Waterloo, Iowa and graduated from Rock Island High School, Rock Island, Illinois in May 1981. After graduating from the Massachusetts Institute of Technology in June 1985 with a Bachelor of Science degree in Aeronautical

CDR Sohl was born in Waterloo, Iowa and graduated from Rock Island High School, Rock Island, Illinois in May 1981. After graduating from the Massachusetts Institute of Technology in June 1985 with a Bachelor of Science degree in Aeronautical Engineering, he continued his education at

4.1网络层提供的两种服务 4.2网际协议P 4.2.1虚拟互连网络 4.2.2分类的P地址 4.2.3P地址与硬件地址 4.2.4地址解析协议ARP与逆地址解析协议 RARP 4.2.5P数据报的格式 4.2.6P层转发分组的流程 4.3划分子网和构造超网 4.3.1划分子网 4.3.2使用子网时分组转发 4.3.3无分类编址CDR(构造超网) 4.4网际控制报文协议icmP 4.4.1CMP报文的种类 4.4.2CMP的应用举例 4.5因特网的路由选择协议 4.5.1有关路由选择协议的几个基本概念 4.5.2内部网关协议RP 4.5.3内部网关协议OSPF 4.5.4外部网关协议BGP 4.5.6路由器的构成 4.6P多播 4.6.1P多播的基本概念 4.6.2在局域网上进行硬件多播 4.6.2因特网组管理协议IGMP和多播路由选 择协议 4.7虚拟专用网VPN和网络地址转换NAT 4.7.1虚拟专用网VPN 4.7.2网络地址转换NAT

Sum list, iterative version 入 Now construct an iterative version (define(sum D) (let loop(( D)(answer o) (if (null? D) answer (loop (cdr D)(+ answer(car sept.17,2003

Slide 12.1.1 In the last lecture, we introduced mutation as a component of 6001s|cP our data structures We saw for example that set was a Environment mode way of changing the value associated with a variable in our system, and we saw that set-car! and set-cdr! were ways of changing the values of parts of list structure Now, several important things happened when we introduced