《计算机网络和 与因特网》课件第二十一章互联网协议地址.pptVIP

Computer Networks and Internets 《计算机网络与因特网》课件 林坤辉;PART III Internetworking;21.2 Addresses for the Virtual Internet 虚拟互联网地址;To give the appearance of a single,uniform system,all host computers must use a uniform addressing scheme,and each address must be unique. To guarantee uniform addressing for all hosts,protocol software defines an addressing scheme that is independent of the underlying physical addresses.;Users, application programs, and higher layers of protocol software use the abstract protocol addresses to communication. The designers are free to choose addresses, packet formats, and delivery techniques independent of the details of the physical hardware.;Each physical network in an internet is assigned a unique value known as a network number. Network number assignments must be coordinated globally. Each computer on a given physical network is assigned a unique address suffix . suffixes can be assigned locally without global coordination.;21.5 Original Classes of IP Addresses IP地址分类;21.6 Computing The Class of An Address 地址类别的计算;21.7 Classes and Dotted Decimal Notation 类别和点分十进制表示法;21.9 Division of the Address Space地址空间的划分;21.11 A Classful Addressing Example;21.12 Subnet and Classless Addressing;21.16 CIDR Host Addresses;21.17 Special IP Addresses;21.18 Summary of Special IP Addresses;21.20 Routers and the IP Addressing principle;作业