首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
计算机
The corporate head office of Ezonexam has a teleconferencing system that uses VOIP (voice over IP) technology. This system uses
The corporate head office of Ezonexam has a teleconferencing system that uses VOIP (voice over IP) technology. This system uses
admin
2009-05-19
19
问题
The corporate head office of Ezonexam has a teleconferencing system that uses VOIP (voice over IP) technology. This system uses UDP as the transport for the data transmissions. If these UDP datagrams arrive at their destination out of sequence, what will happen?
选项
A、UDP will send an ICMP Information Request to the source host.
B、UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
C、UDP will drop the datagrams.
D、UDP will use the sequence numbers in the datagram headers to reassemble the data in the correct order.
E、UDP will not acknowledge the datagrams and wait for a retransmission of the datagrams.
答案
B
解析
Explanation:
VOIP systems utilize UDP because it is faster and uses less overhead. In addition, the reliable transport mechanism used in TCP is useless to VOIP because if a packet gets dropped and needs to be resent, it will be already too late.
UDP provides a service for applications to exchange messages. Unlike TCP, UDP is connectionless and provides no reliability, no windowing, and no reordering of the received data. However, UDP provides some functions of TCP , such as data transfer, segmentation, and multiplexing using port numbers, and it does so with fewer bytes of overhead and with less processing required. UDP data transfer differs from TCP data transfer in that no reordering or recovery is accomplished. Applications that use UDP are tolerant of lost data, or they have some application mechanism to recover data loss.
转载请注明原文地址:https://kaotiyun.com/show/bShZ777K
本试题收录于:
思科640802题库思科认证分类
0
思科640802
思科认证
相关试题推荐
Writeanessayof160-200wordsbasedonthefollowingdrawing.Inyouressay,youshould1)describethedrawingbriefly,
Directions:Wesometimeshearthesadnewsofsuicideinuniversities.Isthereanywaytopreventthisfromhappeningagain
输入一个整数数组,判断该数组是不是某二元查找树的后序遍历的结果。如果是返回true,否则返回false。例如输入5、7、6、9、11、10、8,由于这一整数序列是如下树的后序遍历结果:8/\610
定义栈的数据结构,要求添加一个min函数,能够得到栈的最小元素。要求函数min、push以及pop的时间复杂度都是O(1)。
在用户管理组administrators中删除lusi用户。
设置TCP/IP属性的备用DNS服务器地址202.112.88.31。
下列关于在Windows资源管理器中“查找”文件或文件夹的描述,正确的是______A.可以按照文件或文件夹的名称和位置查找B.查找的位置只能是某个磁盘,而不能是某个磁盘中的文件夹C.可以按照文件中所包含的文字查找D.可以按照文件类型和文件的创建
删除“王跃”在图表中的数据系列,添加“赵刚”的数据系列到图表中。
EzonexamusesstaticTCP/IPaddressingforitsservers.YouareinstallingWindows2000ServeronanewcomputernamedVE32.VE3
给WCS地图添加某些元件可协助哪个进程?A、RF建模B、RF调查C、现场勘测D、镜像
随机试题
农业生态系统是一种人工驯化生态系统。()
实验室应确保其环境条件不会使结果
患者发热,口苦,饮食无味,纳呆,恶心,泛泛欲吐,关节肿痛以下肢为重,全身困乏无力,下肢沉重酸胀,浮肿,有关节积液,舌苔黄腻,脉滑数。其中医证型是
以下关于静脉畸形的叙述,错误的是
虚证不寐的病理因素主要是
依据《安全生产法》的规定,予以关闭的行政处罚由()按照国务院规定的权限决定。
证券公司董事会授权董事长在董事会闭会期间行使董事会部分明确具体的职权,但对涉及公司重大利益的事项不得授权董事长决定。()
三元集团为了保证奶源的安全性,培植了自己的奶源地,这种战略属于()。
3,5,9,16,28,(),77
WelcometovisitourcompanyandIamverygladtohavetheopportunitytointroduceourcompanytoyouall.Ourcompanywasest
最新回复
(
0
)