第13题: [单项选择]{{B}}Questions 12 to 18 are based on the conversation you have just heard.{{/B}} A. See it later when he is not so busy. B. Not see it since he has seen it before. C. Wait for the video to come out. D. Never see it, since it’s not his type. 参考答案:D 答案解析:[听力原文]
W:I’ve got a free ticket to the movies.Do you want to come along
M:It’ll come out on video
第31题: [单项选择]帧中继减少中继结点的处理步骤,它是以______为前提的。 A. 中继交换机具有高速处理能力 B. 基于数据帧在光纤上传输基本不会出错 C. 一种新的帧结构 D. 中继传输距离较短 参考答案:B 答案解析:[解析] 随着数据传输速率高、误码率低的光纤的广泛使用,帧中继是基于光纤上传输基本不会出错的前提,中继交换机只要一检测到帧的目的地址就立即开始转发该帧,以减小网络传输延迟。而流量控制和差错控制由端到端