第4题: [单项选择]如果一个接入交换机有24个10/100Mbps端口,那么上联宽带可以控制在 A. 50Mbps B. 100Mbps C. 120Mbps D. 200Mbps 参考答案:D 答案解析:[解析] 根据经验,层次之间的上联带宽与下一级带宽之比一般控制在1:20,因此,24×100/20=120Mbps,留有一定余量后,一般定为200Mbps,所以选D。
第18题: [单项选择]Passage Three Questions 32 to 35 are based on the passage you have just heard. A. College student viewers. B. Favorite TV serials. C. Soap opera fans. D. College-age viewers. 参考答案:C 答案解析:[听力原文] Which is the best title for the passage