2. 计算机
  3. Traditional IP packet forwarding analyzes the (71) IP address contained in thenetwork layer header of each packet as the packe

Traditional IP packet forwarding analyzes the (71) IP address contained in thenetwork layer header of each packet as the packe

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问题 Traditional IP packet forwarding analyzes the  (71)  IP address contained in thenetwork layer header of each packet as the packet travels from its source to its final destination．A router analyzes the destination IP address independently at each hop in the network．Dynamic(72)protocols or static configuration builds the database needed to analyze the destination IP address(the routing table)．The process of implementing traditional IP routing also is called hop—by-hop destination-based  (73)  routing．Although successful，and obviously widely deployed，certain restrictions，which have been realized for some time．exist for this method of packet forwarding that diminish its (74)．New techniques are therefore required to address and expand the functionality of an IP．based network infrastructure．This first chapter concentrate on identifying these restrictions and presents a new architecture，known as multipleprotocol(75) switching，that provides solutions to some ofthese restrictions．(2013年上半年试题)
(75)
选项 A、const
B、cast
C、mark
D、1abel
答案D
解析 译文：当数据包从其来源到其最终目的地址时，传统的IP报文转发分析包含在每一个数据包的网络层报头的目的IP地址。路由器独立地分析网络中的每一跳目标IP地址。动态路由协议或静态配置生成所需的数据库来分析目标IP地址(路由表)。传统的IP路由实现的过程也被称为基于逐跳目的地的单播路由。虽然成功地广泛采用，但是一些已经实现一段时间的限制仍存在，此方法存在报文的转发减少其灵活性。因此，需要新的技术，以处理和扩展一个基于IP的网络基础设施的功能。第一章着重识别这些限制，并提出了一种新的架构，被称为多协议标签交换，来提供解决这些限制的方法。
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