1-10 试在下列条件下比较电路交换和分组交换。 要传送的报文共 x ( bit )。从源点到终点共经过 k 段链路,每段链路的传播 d ( s ),数据率为 b(b/s) 。在电路交换时电路的建立时间为 s(s) 。在分组交换时分组长度为 p(bit) ,且各结点的排队等待时间可忽略不计。 问在怎样的条件下,分组交换的电路交换的要小? (提示:画一下草图观察 k 段链路共有几个结点。)
【简答题】b. Listen to the dialogue and answer these questions. 1. What’s the name of the airline company? 2. When does the man want to fly? 3. Is Flight 807 a direct flight? 4. What’s the man’s name? 5. What’s...
【简答题】Answer the following questions with the information in the dialogue. 1 What’s the gross weight of each carton? 2 Are the cardboard boxes strong enough for ocean shipping? 3 Did the seller agree ...