【名词&注释】
集线器(hub)、应运而生(emerge as)、微型机(microcomputer)、内存空间(memory space)、人工智能技术(artificial intelligent technology)、数据链路层(data link layer)、系统总线(system bus)、第三层交换机(layer 3 switches)、地址总线(address bus)、相一致(phase matched)
[单选题]E-mail is a(n) ______ message delivery system that allows information such as typed messages and multimedia to be sent to individual compmer users．
A. graphic-based
B. char-based
C. web-based
D. text-based
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举一反三：
[单选题]下列网络互连设备中，工作在数据链路层的是(53)。
A. 交换机
B. 路由器
C. 网桥
D. 网关
[单选题]CD-ROM盘中的信息存储在(13)中。
A. 内外圈磁道
B. 螺旋形磁道
C. 内外圈光道
D. 螺旋形光道
[单选题]在Windows操作系统中，可以打开“开始”菜单的组合键是(3)。
A. Alt+Esc
B. Ctrl+Esc
C. Tab+Esc
D. Shift+Esc
[单选题]虚拟现实技术将现实世界的多维信息映射到计算机的数字空间，并生成相应的虚拟世界，它具有的特征不包括______。
A. 独立性
B. 多感知性
C. 沉浸感
D. 交互性
[单选题]
B． 20K
C． 1M
D． 20M
A. 10KB． 20K
B. 1M
C. 20M
[单选题]Networks can be interconnected by different devices in the physical layer networks can be connected by (71) 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 (72) ，examine the MAC address and forward the frames to a different network while doing minor protocol translation in the process in me network layer，we have routers that can connect two networks，If two networks have (73) network layer，the router may be able to translate betweenthe packer 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 (74) ．As an example，gateways between Internet e-mail and X，400 e-mail must (75) thee-mail message and change various header fields．(68)
A. reapers
B. relays
C. packages
D. modems
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