软件设计师专业英语(1)

最新推荐文章于 2025-04-09 15:23:22 发布

anjun359554673

最新推荐文章于 2025-04-09 15:23:22 发布

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文章标签： system network layer application internet translation

本文链接：https://blog.youkuaiyun.com/anjun359554673/article/details/4530167

版权

本文介绍了网络层设备如中继器、网桥、路由器和应用层的网关在不同层次上的作用，以及软件设计中需求定义阶段的目标，即产生清晰、完整、一致且可测试的技术需求规格说明书。

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Computer English

Networks can be interconnected by different devices. In the physical layer, networks can be connected by repeaters or hubs, which just move the bits from one network to an identical network. One layer up we find bridges and switches, which operate at data link layer. They can accept frames examine the MAC address, and forward the frames to a different network while doing minor protocol translation in the process. In the network layer, we have routers that can connect two networks. If two networks have dissimilar network layer, the router may be able to translate between the packet formats. In the transport layer we find transport gateway, which can interface between two transport connections. Finally in the application layer, application gateways translate message syntax. As an example, gateways between Internet e-mail and X.400 e-mail must