UC知道英语全文翻译2
来源：百度知道 编辑：UC知道 时间：2024/05/08 02:07:50
The relationship between switching and routing parallels that of telephone local and long distance calls. When a telephone call is made to number within the same area code, a local number. The local switch cannot handle all the telephone numbers in the world. When the switch receives a request for a call outside of its area code, it switches the call to a higher-level switch that recognizes area codes. The higher-level switch then switches the call so that it eventually gets to the local switch for the area code dialed.
The router performs a function similar to that of the higher-level switch in the telephone example. Figure shows the ARP tables for Layer 2 addressing and routing tables for Layer 3 addressing. Each computer and router interface maintains an ARP table for Layer 2 communication. The ARP table is only effective for the broadcast domain (or LAN) that it is connected to. The router also maintains a routing table that allows it to router data outside of the broadcast do
The router performs a function similar to that of the higher-level switch in the telephone example. Figure shows the ARP tables for Layer 2 addressing and routing tables for Layer 3 addressing. Each computer and router interface maintains an ARP table for Layer 2 communication. The ARP table is only effective for the broadcast domain (or LAN) that it is connected to. The router also maintains a routing table that allows it to router data outside of the broadcast do
在交换和路由之间的平行关系，本地电话和长途电话。当一个电话号码是向同一地区内的代码，本地号码。本地交换机不能处理所有世界上的电话号码。当开关接收到的以外地区代码调用请求时，它调用切换到更高层次的开关承认区号。更高层次的开关，然后切换调用，以便它最终获得该地区代码为本地交换机拨打。
路由器执行的电话功能，例如类似的更高的水平开关。图显示了第2层处理的ARP表和路由表的第3层处理。每一台计算机和路由器接口维护着一个层的ARP表2沟通。 ARP表是唯一有效的广播域（或LAN），它连接到。该路由器还维护一个路由表，允许境外的广播域到路由器的数据。每个ARP表包含一个IP - MAC地址对。路由表还跟踪路线据了解，该网络可以访问网络的IP地址，跳数或距离的网络和接口的数据必须被发送到到达目的地网络。
第二层交换机只能识别自己的本地MAC地址，而不能受理的第3层的IP地址。当主机有一个非本地的IP地址，它发送的帧到最近的路由器也作为其默认网关称为数据。主机使用S作为目标MAC地址的路由器的MAC地址。
二层交换机互连部分属于同一个逻辑网络或子网。如果主机X需要发送不同的网络或子网一帧一台主机，主机X发送帧的路由器，这也是连接器的开关。该开关就提出了目标MAC地址的路由器框架。路由器检查第3层的包装目标地址转发作出决定。主机X知道该路由器的IP地址，因为路由器的IP配置还包括默认网关的IP地址。