中级数据库系统工程师相同项单选集试卷（中级数据库系统工程师）.docVIP

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中级数据库系统工程师相同项单选集试卷（中级数据库系统工程师）.doc

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试卷第 PAGE 1 页共 NUMPAGES 1 页中级数据库系统工程师相同项单选集试卷（中级数据库系统工程师）姓名:_____________ 年级:____________ 学号:______________ 题型选择题填空题解答题判断题计算题附加题总分得分评卷人得分 1、Networks can be interconnected by different devices. In the physical layer, networks can be connected by (1)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 (2), 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 (3)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 (4). As an example, gateways between Internet e-mail and X.400 e-mail must (5)the e-mail message and change various header fields. A. reapers B. relays C. connectors modems2、 Networks can be interconnected by different devices. In the physical layer, networks can be connected by (1)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 (2), 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 (3)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 (4). As an example, gateways between Internet e-mail and X.400 e-mail must (5)the e-mail message and change various header fields.（2）是（）