2. 计算机
  3. Routers perform the decision process that selects what path a packet takes．These(71)layer devices participate in the collection

Routers perform the decision process that selects what path a packet takes．These(71)layer devices participate in the collection

admin2019-05-15  70
问题 Routers perform the decision process that selects what path a packet takes．These(71)layer devices participate in the collection and distribution of network一layer information， andperform Layer 3 switching based on the contents of the network layer(72)of eachpacket．You can connect the routers direct1y by point一to一point(73)or local一area networks， or you can connect them by LAN or WAN switches．These Layer 2 switches unfortunately donot have the capability to hold Layer 3(74)information or to select the path taken by apacket through analysis ofits Layer 3 destination address．Thus， Layer 2 switches cannot beinvolved in the Layer 3 packet(75)decision process．
(75)
选项 A、switching
B、processing
C、forwarding
D、connecting
答案C
解析 路由器完成决策过程，选择分组要走的通路。这些网络层设备加入分发网络层信息的集合，基于每一个分组网络层头部的内容完成第三层交换功能。你可以直接通过点对点链路或局域网连接路由器，也可以用LAN或WAN交换机连接它们。但是这些第二层交换机不具有保存第三层路由信息的能力，也不能通过分析第三层目标地址选择分组要经过的通路。于是，第二层交换机不会涉入第三层分组转发的决策过程。
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