【正文】
最大鏈路利用率為 __(30)__;若采用后退 N幀 ARQ協(xié)議通信,發(fā)送窗口為 8,則最大鏈路利用率可以達(dá)到 __(31)__。 ( 30) A、 B、 C、 D、 ( 31) A、 B、 C、 D、 【 參考答案 】 2022年下半年 典型試題分析 ● 以太網(wǎng)交換機(jī)根據(jù) __(56)__轉(zhuǎn)發(fā)數(shù)據(jù)包。 ( 56) 【 參考答案 】 2022年下半年 典型試題分析 2022年下半年 ● Networks can be interconnected by different devices. In the physical layer ,works can be connected by __(66)__ or hubs, which just move the bits from one work to an identical work. One layer up we find bridges and switches, which operate at data link layer. They can accept __(67)__ ,examine the MAC address, and forward the frames to a different work while doing minor protocol translation in the process. In the work layer, we have routers that can connect two works, If two works have __(68)__ work layer, the router may be able to translate between the 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 __(69)__. As an example, gateways between Inter and must __(70)__ the message and change various header fields. ( 66) ( 67) ( 68) ( 69) ( 70) 【 參考答案 】