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（71）between sending the notification and notification arriving at the source,thousands of additional（72）may arrive.In ATM network,a major tool for preventing（73）is（74）control.When a host wants a new virtual（75）,it must describe the traffic to be offered and the service expected.

单选题

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（本题）between sending the notification and notification arriving at the source,thousands of additional（72）may arrive.In ATM network,a major tool for preventing（73）is（74）control.When a host wants a new virtual（75）,it must describe the traffic to be offered and the service expected.

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单选题

All vessels navigating in the routing system of the Malacca Straits shall maintain at all times a ___ .A. high speed B. low speed C. moderate speed D. safe speed

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单选题

（ ） It is the WAN transmission technology after IP technology. It uses data label to guide data packet to transmit in open communication network with high speed and high efficiency, and introduces connection mode in a connectionless network, which reduces network complexity.下列 是继IP 技术之后的广域网传输技术，利用数据标签引导数据包在开放的通信网络上进行高速、高效传输，在一个无连接的网络中引入连接模式，减少了网络复杂性。

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单选题

During sea trial, the minimum constant running speed trial for the low speed main engine should be less than____minutes.

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单选题

The low speed diesel engines are tall to allow for long strokes which improve engine _______

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