具体介绍下http,tcp,udp协议,ftp,ip等专业性的网络通信名词
HTTP FTP 为应用层协议,主要应用于某些服务 TCP UDP 传输层协议IP 网络层协议HTTP 中文名称:超文本传送协议 英文名称:hypertext transport protocol;HTTP定义:一种详细规定了浏览器和万维网服务器之间互相通信的规则,通过因特网传送万维网文档的数据传送协议。主要应用于WEB服务TCP:Transmission Control Protocol 传输控制协议TCP是一种面向连接(连接导向)的、可靠的、基于字节流的运输层(Transport layer)通信协议,由IETF的RFC 793说明(specified)。在简化的计算机网络OSI模型中,它完成第四层传输层所指定的功能,UDP是同一层内另一个重要的传输协议。UDP 是User Datagram Protocol的简称, 中文名是用户数据包协议,是 OSI 参考模型中一种无连接的传输层协议,提供面向事务的简单不可靠信息传送服务。它是IETF RFC 768是UDP的正式规范。FTP(File Transfer Protocol, FTP)是TCP/IP网络上两台计算机传送文件的协议,FTP是在TCP/IP网络和INTERNET上最早使用的协议之一,它属于网络协议组的应用层。FTP客户机可以给服务器发出命令来下载文件,上载文件,创建或改变服务器上的目录。 IP是英文Internet Protocol(网络之间互连的协议)的缩写,中文简称为“网协”,也就是为计算机网络相互连接进行通信而设计的协议。在因特网中,它是能使连接到网上的所有计算机网络实现相互通信的一套规则,规定了计算机在因特网上进行通信时应当遵守的规则。任何厂家生产的计算机系统,只要遵守 IP协议就可以与因特网互连互通。IP地址具有唯一性,根据用户性质的不同,可以分为5类。另外,IP还有进入防护,知识产权,指针寄存器等含义。
说实在的,真的很难形容这些协议,只能大概的讲述它有什么作用。 其实也不用认识的太深,系统学习网络知识后,你反过来看这些协议就会明明白白的了。我一开始也是摸不着头脑,不过也没怎么管这些,现在反过来看,就变得简单易懂了。我现在在考CCNP,说实话,看中文版的教程还不如直接读英文版的,英文比中文更容易理解所以也没什么好的中文教程推荐给你,因为都是像百度百科上的那种专业程度很高的语句。我建议你先定个目标然后再学习网络知识,你先考国家计算机四级网络工程师,它的官方教程很不错,你可以看看,看不懂也没关系,你可以边看边做真题,从“实践”中理解定义。其次看看计算机网络第五版(好像是最新版吧),看完这两本,就差不多了,网络的知识并不多,但更新速度很快,大概3年就会全版更新,所以,你要跟上速度啊。现在IPv6都准备开始普及了,所以,近两年,网络发展速度会更快。最后如果还是不懂的话,就参加培训,不懂的问讲解的老师。如果还是不懂,那就没办法了,说明你真的不是搞这个的料。把你邮箱发过来吧,我这有计算机网络第五版。最后,在具体问题中有什么不懂的你可以问我,及时我技术不济,我还有个CCIE和H3CSE的老师 我可以问他,祝你学习有成
HTTP定义:HTTP是一个属于应用层的面向对象的协议。在源服务器上资源进入互联网需要打的抬头。如果这个网站使我是HTTP协议,那你下载时下载时就进行了一次HTTP下载。 tcp:就是计算机与计算机之间的一座桥,只有计算机通讯才能通过的桥.一般单位内部网络的抬头。它是在计算机和网络之间交换文件的最简单的方法。UDP: UDP是使用IP协议在计算机数据交换时提供一定服务的通信协议。它是无连接的传输,例如QQ用的就是这种协议,它发出的数据包后是不管到达否,正确否,只要送出去就行了FTP:比如,人走人行道,车走快车道一样,是个规则。 ip:IP地址是大家比较熟悉的一个协议,它为每一台客户端都注册了一个独立的地址, 就跟每个人的身份证一样。
http:超文本传输协议,不仅可以传输文字,还可以传输视频、图片、音乐等 udp:不可靠传输,像我们用的QQ聊天就是用udp协议传输的 ftp:文件传输协议,传输文件用的
你可以理解成两个国家的人互相写信 。 tcp:你写好信需要包个信封吧就这个,写上源地址目的地址等。udp/tcp:这两是一个层次。tcp:就想是一个在发信前给你先打个电话确认一样,安全级别高点。另一个就是发出去就不管了。 http/ftp:这些属于应用层了,就像你写的是汉字,他那边也必须是懂汉字才能看懂。在实际使用中比较复杂。

英文简称
一般常用缩写 AAMOF as a matter of factADN any day nowAFAIC as far as I'm concernedAFAICS as far as I can seeAFAICT as far as I can tellAFAIK = as far as I know 就我所知AFAIR as far as I rememberAFK away from keyboardAISB as I said beforeAISI as I see itAIUI as I understand itAKA - " Also Known As"AKA also known asANFAWFOS and now for a word from our sponsorANFSCD And now for something completely different...ARP - " Address Resolution Protocol"ARQ - " Automatic Repeat Request"ASAP as soon as possibleASCII(American Standard Code for Information Interchange) :美国信息交换标准码。ASP(Active Server Pages) :是一种基于 Windows NT 的 IIS 的服务器端的脚本编写环境。ATLA another three letter acronymAWGTHTGTATA Are we going to have to go through all this again?AWGTHTGTTA Are we going to have to go through this again?AYOR at your own riscBAK back at keyboardBBL be back later 稍后便回BBS - " Bulletin Board Software" and " Bulletin Board System"BBS be back soonBCNU be seeing youBF boyfriendBFN bye for nowBig5 :大五码,中文内码之一, 此码代表中文繁体字, 为港、台地区广泛使用。BIOS(Basic Input and Output System) :基本输入输出系统。BOT back on topicBRB = be right back 很快回来Browser :浏览器,一种可在 Internet 上任何地方查找和访问文件的程序, 如网景公司 (Netscape) 所推出的 Netscape Navigator 或微软公司 (Microsoft) 的 Microsoft Internet Explorer 。BSD - " Berkeley Software Distribution"BSF but seriously folksBST but seriously thoughBTAIM be that as it mayBTDT been there done thatBTHOM Beats the hell outta me!BTSOOM Beats the shit out of me!BTW = by the way 顺便说一下BTWBO Be there with bells on.Cc: - " Carbon Copy"CD(Compact Disc) :光盘。CGI - " Comman Gateway Interface"CGI(Common Gateway Interface) :通用网关接口,通用网关接口,是 Web 服务器与外部应用程序之间的一个接口标准。CIU(Computer Interface Unit) :计算机接口部件。CMIIW Correct me if I'm wrong.COTFLGOHAHA Crawling on the floor laughing guts out and having a heart attack.CU See you.CUA commonly used acronymCUL See you later. 再会CUL8R See you later.CWYL Chat with you later.CYA Cover your ass.D& C Duck and cover.DBMS(Date Base Mananement System) :数据库管理系统。DC = Washington D . C 华盛顿特区DDE(Dynamic Date Exchang) :动态数据交换。DEC(Digital Equipment Corporation) :数字设备公司。DES - " Data Encryption Standard"DIIK = damned if I know 我的确不知道DILLIGAD Do I look like I give a darn?!DILLIGAF Do I look like I give a fuck!DIY do it yourselvesDIY(er)(Do It Yourself) :自己动手做,泛指操作、使用、安装、维护计算机的人。DNPM darn near pissed myselfDNS - " Domain Name Service"Domain :域,称为网络区域, 每区有独立的运行方式。DOS(Disk Operating System) :磁盘操作系统,是一种早期最常见的操作系统。DUCWIC Do you see what I see?DVD(Digital Video Disk) :数字视盘。DWISNWID Do what I say not what I do.DYHWIH Do you hear what I hear?DYJHIW Don't You just hate it when...E2EG ear to ear grinEIDE(Enhanced Integrated Drive Electronics interface) :增强型集成驱动器电子接口标准,传输速度高,适于大硬盘。EIN(Educational Information Network) :教育信息网。Elm - " Electronic Mail for UNIX"E-mail :电子邮(函)件,是计算机应用软件的通用术语, 可使用户在不同的计算机上发送信息, 电子邮件是网络上最常用的通信方式。EOD end of discussionEOF end of fileEOS end of showESAL Eat shit and live!ETLA extended three letter acronymFAAK falling asleep at keyboardFAFWOA for a friend without accessFAQ - " Frequently asked questions"Fcc: - " File Carbon Copy"FIFO first in first outFirewall :防火墙,用来分割网域、过滤传送和接收资料、及防制非法入侵。FITB Fill in the blank.FOAD Fuck off and die.FOAF friend of a friendFOAFOAG father of a friend of a girlfriendFOAG father of a girlfriendFOC free of chargeFTASB faster than a speeding bulletFTF = face to face 面对面FTL faster than lightFTP - " File Transfer Protocol" (now often seen in lower case as " ftp" )FTP(File Transfer Protocol) :文件传输协议,是 Internet 网上最早使用的文件传输程序。FU fucked upFUBAR - " F'd Up Beyond All Recognition"FUBAR fucked up beyond all recognitionFUBB fouled up beyond beliefFUD (spreading) fear, uncertainty, and disinformationFWIW = for what it's worth 对其价值而言FYA for Your amusementFYE for Your entertainmentFYI = for your information 供参考GA go aheadGAFIA get away from it allGAL get a lifeGateway :网关,资料传输在不同的网段相接的接口。GB :国标码,中文内码之一, 此码代表中文简体字, 为中国大陆广泛使用。GD& R - " Grinning, Ducking and Running (After snide remark)"GF girlfriendGFAK go fly a kiteGG - " Good Game"GGN gotta go nowGIGO garbage in, garbage outGIWIST Gee, I wish I'd said that.GMT - " Greenwich Mean Time"GMTA great minds think alikeGNU - " GNU is Not Unix (recursive)"GR& D grinning, running & duckingGTFOOMF Get the fuck out of my face.GUI - " Graphical Users Interface"HAK hugs and kissesHAND - " Have A Nice Day"HAND have a nice dayHLOL hysterically laughing out loudHLOLARAWCHAWMP hysterically laughing out loud and rolling around while clapping hands and wetting my pantshomepage :主页,在任何超文本系统中, 作为进入 Web 有关文档的初始入口点的文档。HOMPR Hang on, mobile phone's ringing.HP who's then running horrified into the street beeing killed accidentally by a yellow bulldozer ROTFLBTCUTS ... ... unable to stopHTH - " Hope This/To Help(s)"HTML - " HyperText Markup Language"HTML :超文本标示语言,此语言专用在全球互联网上, 为网上标准格式化的一种, 需用浏览器来观看。HTTP - " HyperText Transfer Protocol"HTTP :超文本传送方式,此为网页常用的传送方式之一。HWS(PEST) husband wants sex (please excuse slow typing)hyperlink :超链,此为连接另一些网页的入囗, 含有此连接点的文字通常以蓝字底线显示。hypertext :超文本,此文件规格含有超文本处理语言, 可以通过链接至其它地方, 用於网页上。IAC in any caseIAE = in any event 无论如何IAE in any eventIANAL I am not a lawyer (also IANAxxx, such as IANACPA)IANALBIPOOTV I am not a lawyer, but I play one on TVIARTPFWTSIOWIM I am repeating this parrot-fashion with out the slightest idea of what it means.IBC inadequate, but cuteIBTD I beg to differ.IC = I see 我明白ICCL - " I Could Care Less"ICMP(Internet Control Messages Protocol) : Internet 信报控制协议,如果服务器关闭了该协议服务,那么你将无法" ping" 通它。IDE(Integrated Drive Electronices interface) :集成驱动器电子接口标准,是硬盘广泛使用的一种接口标准。IDGAD I don't give a damn.IDGAS I don't give a shit.IDK I don't know IDK - " I don't know"IHTFP - " I have truly found paradise" (or: I hate this f'n place)IIRC - " If I Recall Correctly"IIRC If I recall correctlyIITYWIMWYBMAD If I tell you what it means will you buy me a drink?IITYWTMWYKM If I tell you what this means will you kiss me?IIWM if it were me (mine)ILIWTPCT I love it when the plan comes togetherILSHIBAMF I laughed so hard I broke all my furniture!IMAP(Internet Message Access Protocol) 协议: Internet 消息访问协议,这是一种比 POP3 协议更具先进特性的协议。IMBO in my biased opinionIMCAO in my completely arrogant opinion (Use for attracting flames!)IMCO in my considered opinionIME in my experienceIMHO = in my humble opinion 依本人愚见IMNSHO in my not so humble opinionIMO = in my opinion 在我看来INPO in no particular orderIO - " Input Output" As in file IO.IOW = in other words 换句话说IP Address :网络协定位址,又称网络地址、 IP 地址, 此地址在全球网络上独一无二, 不可重复。IP(Internet Protocol) :网络协议。IRC - " Internet Relay Chat"IRL in real lifeISA(Industrial Standard Architecture) :工业标准结构,是即将淘汰的一种总线结构。ISO(International Organization for Standardization) :国际标准化组织。ISP - " Internet Service Provider"ISP(Internet Setvice Provider) : Internet 服务提供商。ISTM it seems to meISTR I seem to recallIT(Information Technology) :信息技术。ITA I totally agreeIYKWIM - " If You Know What I Mean"IYKWIMAITYD - " If You Know What I Mean And I Think You Do"IYSWIM If You see what I mean.JAM Just a minute.Java :爪哇语言, Java 是 SUN 公司的编程语言, 用于编制面向网络的小应用程序 (Applet) , 墒雇�秤卸��男Ч�霸怂愕哪芰Α?JavaScript :这是一种在网页中使用的描述语言,可以使网页变得生动活泼。微软版的 JavaScript 被称之为 JScript ,可以在 ASP 中使用。JM2C - " Just My 2 Cents"KISS keep it simple, stupidL & R = later 稍后LAN - " Local Area Network"LAN(Local Area Network) :局域网。LIFO last in first outLLTA Lots and lots of thunderous applause!LMFAO Laughing my fucking ass off.LOL = laughing out loud 大声笑LSHMSH laughing so hard my side hurtsLTIP laughing till I pukeMB(Mega Byte) :百万字节,也称找兆字节,为 1024*1024 个字节。MDA - " Mail Delivery Agent"Metal Oxide Semiconductor Field Effect Transistor"MFG more friendly garbageMFTL my favorite toy languageMHOTY my hat's off to youMIDI(Musical Instrument Digital Interface) :乐器数字接口。MIME - " Multi-purpose Internet Mail Extensions"MMIF my mouth is full MOSFET - "MTFBWY May the force be with you!MTG = meeting 会议MUD - " Multiple User Dungeon" an interactive multiuser gameMYOB Mind your own business!NALOPKT Not a lot of people know that.NBD no big dealNFI no friggin' ideaNFW no fucking wayNH - " Nice Hand"NIMBY not in my back yardNIT = night 晚上NNTP - " Network News Transfer Protocol"NOS(Network Operate System) :网络操作系统。NRN = no reply necessary 不必回答NS(Network Service) :网络服务。NTL neverthelessNTP - " Network Time Protocol"NTTAWWT not that there's anything wrong with thatNY = New York 纽约O.K. - abbreviation of " oll korrect"OAO over and outOATUS on a totally unrelated subjectOAUS on an unrelated subjectOBTW oh, by the wayOIC Oh , I see .我明白了。OICQ 使用的便是本协议。OLE(Object Linking and Embedding) :对象链接与嵌入。OLL KORRECT, so the abreviation for those words were O.K.ONNA Oh no, not again!ONNTA Oh no, not this again!OOTB out of the box (brand new)OOTC obligatory on-topic commentOS(Operating System) :操作系统。OSF - " Open Software Foundation"OSI(Open System Intercinnection) :开放系统互连。OTC Over the counterOTOH = on the other hand 另一方面OTOOH on the other other handOTT over the topOTTH on the third handOTTOMH off the top of my headOTTOMHAROOB off the top of my head and rolling out of boundsOTW on the wholeOWTTE or words to that effect P.S. - " Post Script"PCI(Peripherial Component Interconnect) :外围设备互连,也是一种总线结构。PD public domainPEM = privacy enhanced mail 保密邮件PERL - " Pratical Extraction and Reporting Language" or " Pathologically Eclectic Rubbish Lister" "Perl 语言:目前在写 CGI 程序中最流行的一种语言, 大部份用来写给通用网关接口处理一些网页传送。PINE - " Pine Is Not Elm"PITA pain in the assPLS = please 请PMFJI - " Pardon Me For Jumping In (another polite way to get into a running discussion"PMIGBOM Put mind in gear, before opening mouth!PMJI - " Pardon My Jumping In (another polite way to get into a running discussion"PMYMHMMFSWGAD Pardon me, you must have mistaken me for some one who gives a damnPOP3 协议:电子邮件接收协议第三版,支持该协议的电子邮件服务器允许用户把服务器端的电子邮件用电子邮件收发程序接收到本地来。POV point of view PovRay - " Persistence of Vision Ray Tracer"PPP - " Point-to-Point Protocol"PS - " Post Script"RAEBNC Read and enjoyed, but no comment.RARP - " Reverse Address Resolution Protocol"Re: - " Regarding" . Often used in mail software.Req: - " Request" .RFC - " Request For Comments"ROTBA reality on the blink againROTFFNAR rolling on the floor for no apparent reasonROTFL = rolling on the floor laughing 笑得在地上打滚ROTFLAHMS ... and holding my sidesROTFLASTC ... and scaring the catROTFLBTC ... biting the carpetROTFLBTCACTC ... ... and scaring the catROTFLBTCASTCIIHO ... ... ... if I had oneROTFLBTCDICAJTTWADBSIHPWTRHITSBKABAYB ... dancing in circles and jumping through the window almost dieing by smashing intoROTFLGO ... guts outROTFLMAO - " Rolling On The Floor Laughing My Ass Off"ROTFLOL ... out loudROTFLOLVH ... out loud very hardROTFLSTC ... scaring the catROTFTPOF ... trying to put out flamesROTFWTIME rolling on the floor with tears in my eyesRSN real soon now (which may be a long time coming)RTF - " Rich Text Format"RTFAQ read the FAQ RTFI read the fucking instructionsRTFM read the fucking manualRTFMA read the fucking manual, againRTFMS Read the fucking manual, sir! (from the military)RTM = read the manual 读指导手册RUOK Are You OK? SBCN Sitting behind the computer naked.SCNR Sorry, couldn`t resist.SCSI(Small Computer Standand Interface) :小型计算机磁盘标准接口。SGML - " Standard Generalized Markup Language"SHM Shit happens, mate. SICS sitting in chair snickeringSIMCA sitting in my chair amusedSITD still in the dark SLIP - " Serial Line Internet Protocol"SMOP small matter of programmingSMTP - " Simple Mail Transfer Protocol"SMTP 服务器才能被发送出去。SMTP(Simple Message Transfer Protocol) 协议:简单邮件传输协议,用于电子邮件的传输。电子邮件需要有SNAFU situation normal, all fucked upSNR signal to noise ratioSO significant otherSOHF - " Sense Of Humor Failure"SOI stunk on ice sp? - abbreviation of " spelling?"SPAM - " Stupid Persons' AdvertiseMent "SWAG - " Scientific Wild Ass GuessSWALK - " Sealed With A Loving Kiss"SWISH - " Simple Web Indexing System for Humans"TAFN that's all for nowTANJ there ain't no justiceTANSTAAFL there ain't no such thing as a free lunchTARFU things are really fouled upTCP(Transmission Control Protocol)/IP(Internet Protocol) 协议:用于网络的一组通讯协议,包括传输协议和网际协议。TCP/IP - " Transmissions Control Protocol/Internet Protocol"TGAL think globally, act locallyTHOT = thought 思想TIA - " The Internet Adaptor"TIA = thanks in advance 先谢谢了TIC tongue in cheekTINALO this is not a legal opinionTINAR this is not a recommendationTINWIS that is not what I saidTLA = three-letter acronyms 三个字母的缩写词TLA VG = very good 非常好TMTOWTDI there's more than one way to do itTNOTVS theres nothing on TV so,....TNX thanks TPS(S) this program sucks (severely)TPTB the powers that beTRDMC tears running down my cheeksTSOHF total sense of humor failureTTBOMK to the best of my knowledgeTTFN ta ta for nowTTUL = talk to you later 以后再说TTY - " Tele-TYpe"TTYL talk to you laterTTYRS talk to you real soonTUFD the user file diedTVM thanks very muchTWIMC - " To Whom It May Concern"TYCLO Turn your CAPS LOCK off. (Quit shouting.)TYVM = thank you very much 非常感谢U = you 你UBD user brain damageUDP - " User Datagram Protocol"UDP(User Datagram Protocol) 协议:用户数据报协议,这是一种架设于TCP/IP 协议之上的快速协议,但不具备较好的安全性UPGS unfinished project guilt syndromeUPS(Uninterrupted Power Supply) :不间断电源。UR = your 你的URL - " Uniform Resource Locator"URL :全球资源统一定位符,网页在全球互联网上独一无二的定位点。UTC under the counterUTT under the tableVCD(Video Compact Disc) :可视光盘。VETLA very enhancedVGA(Video Graphica Array) :视频图形阵列。VR virtual realityVRAM(Video Read Access Memory) :显示存储器,供显示卡使用。VRML(Virtual Reality Modeling Language) :虚拟实境模拟语言, 此语言可使网页产生虚拟现实 (Virtual Reality) 的立体动画效果。WAB? What another bill?WAG wild ass guessWAIS - " Wide Area Information Server "WAIS(Wide Area Information Server) :广域网信息服务。WAN - " Wide Area Networks "WAN(Wide Area Network) :广域网或称远距离网络。WDYMBT What do you mean by that?WEDS / WEDNES = Wednesday 星期三WGAS Who gives a shit?WIBAMU Well, I'll be a monkey's uncle.WIBNI would it be nice ifWMMOWS Wash my mouth out with soap!WNOHGB where no one has gone beforeWRT = with respect to 关于WRT with regard toWT without thinkingWTH what the hellWTTM without thinking too muchWWW or 3W - " World Wide Web "WWW( World Wide Web) :万维网,是 Internet 上发展最快的部分, 需用浏览器查阅。WYLABOCTGWTR Would you like a bowl of cream to go with that remark?WYLASOMWTC Would you like a saucer of milk with that comment?WYSIWYG = what you see is what you get 所见即所得WYTYSYDG What you thought you saw, you didn't get.YAOTM yet another off-topic messageYHGASP You have got a serious problemYMMV - " Your Mileage May Vary" (You may not have the same luck I did)YWIA - " You're welcome in advance"YWSYLS You win some, you lose somewww.acronym.cn上面有更多参考资料:http://epizza.open.edu.cn/sbpage/abrv.htm
http://zhidao.baidu.com/question/12624331.html?si=7 参考这

名词解释DNS,TCP,UDP
DNS 是域名系统 (Domain Name System) 的缩写,它是由解析器和域名服务器组成的。域名服务器是指保存有该网络中所有主机的域名和对应IP地址,并具有将域名转换为IP地址功能的服务器。其中域名必须对应一个IP地址,而IP地址不一定有域名。域名系统采用类似目录树的等级结构。域名服务器为客户机/服务器模式中的服务器方,它主要有两种形式:主服务器和转发服务器。将域名映射为IP地址的过程就称为“域名解析”。在Internet上域名与IP地址之间是一对一(或者多对一)的,域名虽然便于人们记忆,但机器之间只能互相认识IP地址,它们之间的转换工作称为域名解析,域名解析需要由专门的域名解析服务器来完成,DNS就是进行域名解析的服务器。 DNS 命名用于 Internet 等 TCP/IP 网络中,通过用户友好的名称查找计算机和服务。当用户在应用程序中输入 DNS 名称时,DNS 服务可以将此名称解析为与之相关的其他信息,如 IP 地址。因为,你在上网时输入的网址,是通过域名解析系统解析找到了相对应的IP地址,这样才能上网。其实,域名的最终指向是IP。 TCP(Transmission Control Protocol 传输控制协议)是一种面向连接的、可靠的、基于字节流的传输层通信协议,由IETF的RFC 793定义。在简化的计算机网络OSI模型中,它完成第四层传输层所指定的功能,用户数据报协议(UDP)是同一层内另一个重要的传输协议。在因特网协议族(Internet protocol suite)中,TCP层是位于IP层之上,应用层之下的中间层。不同主机的应用层之间经常需要可靠的、像管道一样的连接,但是IP层不提供这样的流机制,而是提供不可靠的包交换。UDP(User Data Protocol,用户数据报协议)是与TCP相对应的协议。它是面向非连接的协议,它不与对方建立连接,而是直接就把数据包发送过去! UDP适用于一次只传送少量数据、对可靠性要求不高的应用环境。比如,我们经常使用“ping”命令来测试两台主机之间TCP/IP通信是否正常,其实“ping”命令的原理就是向对方主机发送UDP数据包,然后对方主机确认收到数据包,如果数据包是否到达的消息及时反馈回来,那么网络就是通的。例如,在默认状态下,一次“ping”操作发送4个数据包(如图2所示)。大家可以看到,发送的数据包数量是4包,收到的也是4包(因为对方主机收到后会发回一个确认收到的数据包)。这充分说明了UDP协议是面向非连接的协议,没有建立连接的过程。正因为UDP协议没有连接的过程,所以它的通信效果高;但也正因为如此,它的可靠性不如TCP协议高。QQ就使用UDP发消息,因此有时会出现收不到消息的情况。

udp是什么意思
udp是什么意思 是UDP吧,是一种网络协议。UDP 是User Datagram Protocol的缩写, 即用户数据报协议,是OSI(Open System Interconnection,开放式系统互联) 参考模型中一种无连接的传输层协议,提供面向事务的简单不可靠信息传送服务,IETF RFC768是UDP的正式规范。UDP在IP报文的协议号是17。与TCP(传输控制协议)协议一样,UDP协议直接位于IP(网际协议)协议的顶层。根据OSI(开放系统互连)参考模型,UDP和TCP都属于传输层协议。UDP协议的主要作用是将网络数据流量压缩成数据包的形式。一个典型的数据包就是一个二进制数据的传输单位。每一个数据包的前8个字节用来包含报头信息,剩余字节则用来包含具体的传输数据。功能为了在给定的主机上能识别多个目的地址,同时允许多个应用程序在同一台主机上工作并能独立地进行数据包的发送和接收,设计用户数据报协议UDP。使用UDP协议包括:TFTP、SNMP、NFS、DNS、BOOTPUDP使用底层的互联网协议来传送报文,同IP一样提供不可靠的无连接数据包传输服务。它不提供报文到达确认、排序、及流量控制等功能。UDP协议的更多技术细节详见:http://baike.baidu.com/link?url=UHxEDfVc-VEBBvdo4LvqHSHLgvU6P_csQDeolV2gsykAydqWWX8EUaCgw1ytSkISN_nFXHe8I0PNPS3ufylPQbwqpRNuOSPym85O7ecB7hH_mu0VB-V9CiXakblQtR3HTG5z5r50cv6oGDMx9vTl_eGJ7khkslT4pFzgfouJhO3
我知道的UDP,是不可靠传输协议 UDP是OSI参考模型中一种无连接的传输层协议,它主要用于不要求分组顺序到达的传输中,分组传输顺序的检查与排序由应用层完成[2] ,提供面向事务的简单不可靠信息传送服务。UDP 协议基本上是IP协议与上层协议的接口。UDP协议适用端口分别运行在同一台设备上的多个应用程序。 不知道是不是你想要的

求生物化学名词英语缩写
CDP 胞苷二磷酸(cytidine diphosphate) CTP 胞苷三磷酸(cytidine triphosphate)EMP 糖酵解途径(Emoden-Meyerbof-Parnas pathway)GDP 鸟苷二磷酸(guanosine diphosphate)GTP 鸟苷三磷酸(guanosine triphosphate)IU 国际单位(international unit)IF 起始因子(initiation factor)、等电聚焦(isoelectric focusing)NADH 烟酰胺腺嘌呤二核苷酸(nicotinamide adenine dinucleotide,NAD+)的还原形式NADPH 烟酰胺腺嘌呤二核苷酸磷酸(nicotinamide adenine dinucleotide phosphate,NADP+)的还原形式UMP 鸟苷酸(uridine monophosphate)UDP 尿苷二磷酸(uridine diphosphate)UTP 尿苷三磷酸(uridine triphosphate)FAS、ETC、FADF2不确定,以下给你参考FAS 美国科学家联合会(Federation of American Scientists)、TNF受体家族的Fas基因EC 酶学委员会(enzyme commission)ETC 等等(etc.)FA 脂肪酸(fatty acid)FAD 黄素腺嘌呤二核苷酸(flacin adenine dinucleotide) FADH2 还原型黄素腺嘌呤二核苷酸(flavin adenine dinucleotide,reduced)
CDP 胞苷二磷酸 CTP 胞苷三磷酸ETC 电子传递链EMP 糖酵解GDP 解离抑制因子NADH NADH脱氢酶NADPH NADPH脱氢酶UMP尿嘧啶核苷酸UDP尿苷二磷酸 UTP 尿嘧啶核苷三磷酸

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