帧中继网CHINAFRN的虚电路建立在 (24) ，用户平面采用的协议是 (25) 。这种网络没有流量控制功能，但是增加了拥塞控制功能，如果沿着帧传送方向出现了拥塞，则把帧地址字段中的 (26) 位置1。这样接收方就可以通过 (27) 要求发送方降低数据传输速率。以下选项中 (28) 是适合提供帧中继业务的网络。

A:网络层协议 B:数据链路层协议 C:传输层协议 D:高层协议

帧中继网CHINAFRN的虚电路建立在 (24) ，用户平面采用的协议是 (25) 。这种网络没有流量控制功能，但是增加了拥塞控制功能，如果沿着帧传送方向出现了拥塞，则把帧地址字段中的 (26) 位置1。这样接收方就可以通过 (27) 要求发送方降低数据传输速率。以下选项中 (28) 是适合提供帧中继业务的网络。

A:LAN B:ATM C:DDN D:ISDN

Web browser is simply a terminal emulator, designed to display text on a screen. The two essential differences between an ordinary terminal emulator and a Web browser are that the browser knows how to deal with (71) , and that it has a mechanism for (72) graphical files. Display text, display graphics, and (73) hypefiinks, there’s 99 percent of the (74) value. That’s not to say that the manufacturers didn’t go all-out to attach a hyperactive efflorescence of useless capabilities onto their browsers. Remember when media channels in the browser were a big deal, instead of the clutter you can’t wait to delete from your favorites of bookmarks menu Remember when client-side Java applets were supposed to become the preferred (75) for application development Remember frames and all their nasty side effects

A:superlinks B:links C:hyperlinks D:connections

Web browser is simply a terminal emulator, designed to display text on a screen. The two essential differences between an ordinary terminal emulator and a Web browser are that the browser knows how to deal with (71) , and that it has a mechanism for (72) graphical files. Display text, display graphics, and (73) hypefiinks, there’s 99 percent of the (74) value. That’s not to say that the manufacturers didn’t go all-out to attach a hyperactive efflorescence of useless capabilities onto their browsers. Remember when media channels in the browser were a big deal, instead of the clutter you can’t wait to delete from your favorites of bookmarks menu Remember when client-side Java applets were supposed to become the preferred (75) for application development Remember frames and all their nasty side effects

A:displaying B:illustrating C:drawing D:writing

Web browser is simply a terminal emulator, designed to display text on a screen. The two essential differences between an ordinary terminal emulator and a Web browser are that the browser knows how to deal with (71) , and that it has a mechanism for (72) graphical files. Display text, display graphics, and (73) hypefiinks, there’s 99 percent of the (74) value. That’s not to say that the manufacturers didn’t go all-out to attach a hyperactive efflorescence of useless capabilities onto their browsers. Remember when media channels in the browser were a big deal, instead of the clutter you can’t wait to delete from your favorites of bookmarks menu Remember when client-side Java applets were supposed to become the preferred (75) for application development Remember frames and all their nasty side effects

A:direct B:navigate C:indicate D:go-on

Web browser is simply a terminal emulator, designed to display text on a screen. The two essential differences between an ordinary terminal emulator and a Web browser are that the browser knows how to deal with (71) , and that it has a mechanism for (72) graphical files. Display text, display graphics, and (73) hypefiinks, there’s 99 percent of the (74) value. That’s not to say that the manufacturers didn’t go all-out to attach a hyperactive efflorescence of useless capabilities onto their browsers. Remember when media channels in the browser were a big deal, instead of the clutter you can’t wait to delete from your favorites of bookmarks menu Remember when client-side Java applets were supposed to become the preferred (75) for application development Remember frames and all their nasty side effects

A:Web browser’s B:terminal’s C:emulator’s D:network’s

Web browser is simply a terminal emulator, designed to display text on a screen. The two essential differences between an ordinary terminal emulator and a Web browser are that the browser knows how to deal with (71) , and that it has a mechanism for (72) graphical files. Display text, display graphics, and (73) hypefiinks, there’s 99 percent of the (74) value. That’s not to say that the manufacturers didn’t go all-out to attach a hyperactive efflorescence of useless capabilities onto their browsers. Remember when media channels in the browser were a big deal, instead of the clutter you can’t wait to delete from your favorites of bookmarks menu Remember when client-side Java applets were supposed to become the preferred (75) for application development Remember frames and all their nasty side effects

A:plane B:plant C:plate D:platform

IEEE802.5令牌环网中，时延是由 (36) 决定的。要保证环网的正常运行，整个环网的时延必须大于 (37) 。设有一个令牌环网，长度为400m，环上有28个站，数据速率为4Mbit/s，信号传播速度为200m/μs，每个站点引入1位时延，则环网的最大和最小时延分别为 (38) 和 (39) 。

A:站点时延和信号传播时延 B:令牌帧的长短和数据帧的长短 C:电缆长度和站点个数 D:数据速率和信号传播速度

IEEE802.5令牌环网中，时延是由 (36) 决定的。要保证环网的正常运行，整个环网的时延必须大于 (37) 。设有一个令牌环网，长度为400m，环上有28个站，数据速率为4Mbit/s，信号传播速度为200m/μs，每个站点引入1位时延，则环网的最大和最小时延分别为 (38) 和 (39) 。

A:数据帧长 B:令牌帧长 C:信号传播时延 D:站点个数

IEEE802.5令牌环网中，时延是由 (36) 决定的。要保证环网的正常运行，整个环网的时延必须大于 (37) 。设有一个令牌环网，长度为400m，环上有28个站，数据速率为4Mbit/s，信号传播速度为200m/μs，每个站点引入1位时延，则环网的最大和最小时延分别为 (38) 和 (39) 。

A:1 B:8 C:20 D:24