●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．

试卷相关题目

• 1(66).is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point to point communication．<br class="bogusBR">(67).is a professional organization of individuals in multiple professions which focuses on effort on lower-layer protocols．<br class="bogusBR">(68).functions with two layers of protocols．It Can connect networks of different speeds and can be adapted to an environment as it expands．<br class="bogusBR">(69).is the popular LAN developed under the direction of the IEEE 802．5．<br class="bogusBR">(70).is the popular backbone technology for transmitting information at high speed with a high level of fault tolerance which is developed under the direction of ANSI．

  A.The MAC address

  B.The IP address

  C.The subnet address

  D.The virtual address

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• 2●DNS的作用是  (65)  。

  A.为客户机分配IP地址

  B.访问HTTP的应用程序

  C.将计算机名翻译为IP地址

  D.将MAC地址翻译为IP地址

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• 3●HTTP协议是常用的应用层协议，它通过  (60)  协议提供服务，上下层协议默认时，使用  (61)  端口进行服务识别。HTTP双方的一次会话与上次会话是  (62)  ，即协议是无状态的。从交换信息的整体性说是  (63)  ，SHTTP对HTTP的扩展在于  (64)  。

  A.IP

  B.UCP

  C.TCP

  D.ICMP

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• 4●MIB-Ⅱ组的组织结构是一种  (59)  。

  A.链表结构

  B.线性结构

  C.树形结构

  D.分层结构

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• 5●Telnet采用  (58)  方法确定对方的TSAP。

  A.静态分配TSAP

  B.动态分配TSAP

  C.名字服务器

  D.随机选取TSAP

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