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（） Yes, I’d like to speak to the person who deals with paying your suppliers, please.
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In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.In low-speed network, it is usually adequate to wait for congestion to occur and then react to it by telling the source of packets to slow down. In high-speed networks, this approach often works poorly, because in the (1) between sending the notification and notification arriving at the source, thousands of additional (2) may arrive. In ATM network, a major tool for preventing (3) is (4) control. When a host wants a new virtual (5) , it must describe the traffic to be offered and the service expected. 2（）
For each blank, choose the best answer from the four choices and write down on the answer sheet.(1) is a one-way function that takes an arbitrarily long piece of plaintext and from it computes a fixed-length bit string.(2) is a protocol that most USENET machines now use it to allow news articles to propagate from one machine to another over a reliable connection.(3) is an approach preferred by cable TV providers. In this solution the fiber terminates at an optoelectrical converter and the final segment is a shared coaxial cable.(4) is a device used to connect two separate network that use different communication protocol.(5) is a digital-to-digital polar encoding method in which the signal level is always either positive or negative. 2（）
For each blank, choose the best answer from the four choices and write down on the answer sheet.(1) is a one-way function that takes an arbitrarily long piece of plaintext and from it computes a fixed-length bit string.(2) is a protocol that most USENET machines now use it to allow news articles to propagate from one machine to another over a reliable connection.(3) is an approach preferred by cable TV providers. In this solution the fiber terminates at an optoelectrical converter and the final segment is a shared coaxial cable.(4) is a device used to connect two separate network that use different communication protocol.(5) is a digital-to-digital polar encoding method in which the signal level is always either positive or negative. 1（）
现代计算机体系结构的发展突破了冯·诺依曼的体系结构，主要表现在 (1) 。多机系统与多计算机构成的计算机网络差别的主要特征是 (2) 。面向对象程序设计以 (3) 为基本的逻辑构件，用 (4) 来描述具有共同特征的一组对象，以 (5) 为共享机制，共享类中的方法和数据。 1（）
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