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
Which layer of the OSI reference model is responsible for ensuring reliable end-to-end delivery of data? A. Application B. Prese
Which layer of the OSI reference model is responsible for ensuring reliable end-to-end delivery of data? A. Application B. Prese
admin
2009-05-19
20
问题
Which layer of the OSI reference model is responsible for ensuring reliable end-to-end delivery of data?
A. Application
B. Presentation
C. Session
D. Transport
E. Network
F. Data-Link
选项
答案
D
解析
Explanation:
A key function of the transport layer is to provide connection services for the protocols and applications that run at the levels above it. These can be categorized as either connection-oriented services or connectionless services. Some protocol suites, such as TCP/IP, provide both a connection-oriented and a connectionless transport layer protocol, to suit the needs of different applications.
The transport layer is also the place in the layer stack where functions are normally included to add features to end-to-end data transport. Where network layer protocols are normally concerned with just "best effort" communications, where delivery is not guaranteed. Transport layer protocols are given intelligence in the form of algorithms that ensure that reliable and efficient communication between devices takes place. This encompasses several related jobs, including lost transmission detection and handling, and managing the rate at which data is sent to ensure that the receiving device is not overwhelmed.
Transmission quality, meaning ensuring that transmissions are received as sent, is so important that some networking references define the transport layer on the basis of reliability and flow-control functions. However, not all transport layer protocols provide these services. Just as a protocol suite may have a connection-oriented and a connectionless transport layer protocol, it may also have one that provides reliability and data management services, and one that does not. Again, this is the case with TCP/IP: there is one main transport layer protocol; TCP, that includes reliability and flow control features, and a second, UDP, that doesn’t.
转载请注明原文地址:https://kaotiyun.com/show/l0hZ777K
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,
Writeanessayof160-200wordsbasedonthefollowingdrawing.Inyouressay,youshould1)describethedrawingbriefly,
Forthispart,youareallowed30minutestowriteacompositionaccordingtothefollowingtopic.CCTVhasbeenputtingup
Supposeyouwanttoapplyforajobinacompanyasanofficesecretary.Writeanapplicationemailto1)introduceyourself
Afundamentalproblemforunderstandingtheevolutionofhumanlanguagehasbeenthelackofsignificantparallelsamongnonhuma
InParagraphs1and2,thetextshowsPTK’s______.Anappropriatetitleforthetextismostlikelytobe______.
Asanyhumanbeingknows,manyfactorsgovernwhetherpeoplearehappyorunhappy.Externalcircumstancesareimportant:employe
Amidtheendlesstypingandclickingonsmartphonesandcomputers,ink-basedwritinginstrumentscontinuetoprevail,whichis
Fredisanewsecurityofficerwhowantstoimplementacontrolfordetectingandpreventinguserswhoattempttoexceedtheira
随机试题
递延资产
嗜酸性粒细胞减少,见于
(2005年)图8—38所示变压器,一次额定电压U1N=220V,一次额定电流I1N=11A,二次额定电压U2N=600V。该变压器二次电流额定值I2N约为()A。
若(3x2+2x)dx=0,(k≠0),则k等于:
简述人类学习与动物学习的区别。
下面是《祝福》教学实录的片段,阅读后回答问题。生:为什么她叫祥林嫂?(全班笑)生:为什么你叫林子浩?(前一提问的学生脸红)师:这个问题提得好,祥林嫂这个名字的确大有讲究啊!生:(一脸诧异)啊?师:大家请找出《祝福》中单独成段的一句话——“大家
戒毒人员在强制戒毒期间死亡的,应当()。
妇女适合当警察的想法是荒唐的。妇女毕竟比男子平均矮15厘米,轻15公斤。很显然,在遇到暴力事件时,妇女没有男子有效。以下哪项如果为真,最能削弱以上论证?
August10JordanMcLeod451NGarnetDriveNashville,TN37209DearMr.McLeod,Thankyouforyourinterestin【K4】______JointH
FormanypeopleintheU.S.,sportsarenotjustforfun.Theyarealmostareligion.Thousandsofsportsfansbuyexpensivetic
最新回复
(
0
)