著名的tcp端口与udp端口(tcp端口和udp端口怎么区分)

常用20,21,443,80，谢谢

用户使用telnet用户程序与服务进程建立一个连接。用户程序向服务进程写入信息，服务进程读出信息并发出响应，用户程序读出响应并向用户报告。因而，这个连接是双工的，可以用来进行读写。 tcp或udp连接唯一地使用每个信息中的如下四项进行确认：源ip地址发送包的ip地址。目的ip地址接收包的ip地址。源端口源系统上的连接的端口。目的端口目的系统上的连接的端口。 端口指网络中面向旦虎测臼爻铰诧歇超忙连接服务和无连接服务的通信协议端口，是一种抽象的软件结构，包括一些数据结构和i/o（基本输入输出）缓冲区。它是一个软件结构，被客户程序或服务进程用来发送和接收信息。一个端口对应一个16比特的数。
计算机之间相互通信的时候，分为两种方式： 一种是发送信息以后，可以确认信息是否到达，也就是有应答的方式，这种方式大多采用TCP协议。在TCP传输控制协议中，建立端对端的连接是靠IP地址和TCP的端口号的共同作用。所以TCP协议使用的端口叫TCP端口。IE浏览器使用的协议是TCP协议，它用的端口就是TCP端口。一种是发送以后就不管了，不去确认信息是否到达，这种方式大多采用UDP协议。UDP也是使用端口号进行连接的。 如QQ，使用的是UDP协议端口。

TCP端口和UDP端口主要是区别，基本没什么联系： 1）TCP端口---传输控制协议,提供的是面向连接、可靠的字节流服务。当客户和服务器彼此交换数据前，必须先在双方之间建立一个TCP连接，之后才能传输数据。TCP提供超时重发，丢弃重复数据，检验数据，流量控制等功能，保证数据能从一端传到另一端。 2）UDP端口---用户数据报协议，是一个简单的面向数据报的运输层协议。UDP不提供可靠性，它只是把应用程序传给IP层的数据报发送出去，但是并不能保证它们能到达目的地。由于UDP在传输数据报前不用在客户和服务器之间建立一个连接，且没有超时重发等机制，故而传输速度很快。

TCP端口和UDP端口主要是区别，基本没什么联系： 1）TCP端口---传输控制协议,提供的是面向连接、可靠的字节流服务。当客户和服务器彼此交换数据前，必须先在双方之间建立一个TCP连接，之后才能传输数据。TCP提供超时重发，丢弃重复数据，检验数据，流量控制等功能，保证数据能从一端传到另一端。 2）UDP端口---用户数据报协议，是一个简单的面向数据报的运输层协议。UDP不提供可靠性，它只是把应用程序传给IP层的数据报发送出去，但是并不能保证它们能到达目的地。由于UDP在传输数据报前不用在客户和服务器之间建立一个连接，且没有超时重发等机制，故而传输速度很快。
TCP（Transmission Control Protocol，传输控制协议）是基于连接的协议，也就是说，在正式收发数据前，必须和对方建立可靠的连接。一个TCP连接必须要经过三次“对话”才能建立起来，其中的过程非常复杂，我们这里只做简单、形象的介绍，你只要做到能够理解这个过程即可。我们来看看这三次对话的简单过程：主机A向主机B发出连接请求数据包：“我想给你发数据，可以吗？”，这是第一次对话；主机B向主机A发送同意连接和要求同步（同步就是两台主机一个在发送，一个在接收，协调工作）的数据包：“可以，你什么时候发？”，这是第二次对话；主机A再发出一个数据包确认主机B的要求同步：“我现在就发，你接着吧！”，这是第三次对话。三次“对话”的目的是使数据包的发送和接收同步，经过三次“对话”之后，主机A才向主机B正式发送数据。 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。
TCP端口和UDP端口主要是区别，基本没什么联系： 1）TCP端口---传输控制协议,提供的是面向连接、可靠的字节流服务。当客户和服务器彼此交换数据前，必须先在双方之间建立一个TCP连接，之后才能传输数据。TCP提供超时重发，丢弃重复数据，检验数据，流量控制等功能，保证数据能从一端传到另一端。 2）UDP端口---用户数据报协议，是一个简单的面向数据报的运输层协议。UDP不提供可靠性，它只是把应用程序传给IP层的数据报发送出去，但是并不能保证它们能到达目的地。由于UDP在传输数据报前不用在客户和服务器之间建立一个连接，且没有超时重发等机制，故而传输速度很快。
每一项服务都对应相应的端口，比如众如周知的www服务的端口是80，smtp是25，ftp是21，win2000/xp安装中默认的都是这些服务开启的。对于个人用户来说确实没有必要，关掉端口也就是关闭无用的服务。 “控制面板”的“管理工具”中的“服务”中来配置。1、关闭7.9等等端口：关闭simpletcp/ipservice,支持以下tcp/ip服务：charactergenerator,daytime,discard,echo,以及quoteoftheday。2、关闭80口：关掉www服务。在“服务”中显示名称为"worldwidewebpublishingservice"，通过internet信息服务的管理单元提供web连接和管理。3、关掉25端口：关闭simplemailtransportprotocol(smtp)服务，它提供的功能是跨网传送电子邮件。4、关掉21端口：关闭ftppublishingservice,它提供的服务是通过internet信息服务的管理单元提供ftp连接和管理。5、关掉23端口：关闭telnet服务，它允许远程用户登录到系统并且使用命令行运行控制台程序。6、还有一个很重要的就是关闭server服务，此服务提供rpc支持、文件、打印以及命名管道共享。关掉它就关掉了win2k的默认共享，比如ipc$、c$、admin$等等，此服务关闭不影响您的共他操作。7、还有一个就是139端口，139端口是netbios　session端口，用来文件和打印共享，注意的是运行samba的unix机器也开放了139端口，功能一样。以前流光2000用来判断对方主机类型不太准确，估计就是139端口开放既认为是nt机，现在好了。关闭139口听方法是在“网络和拨号连接”中“本地连接”中选取“internet协议(tcp/ip)”属性，进入“高级tcp/ip设置”“wins设置”里面有一项“禁用tcp/ip的netbios”，打勾就关闭了139端口。对于个人用户来说，可以在各项服务属性设置中设为“禁用”，以免下次重启服务也重新启动，端口也开放了。电脑端口基础知识端口可分为3大类：1）公认端口（wellknownports）：从0到1023，它们紧密绑定于一些服务。通常这些端口的通讯明确表明了某种服务的协议。例如：80端口实际上总是http通讯。2）注册端口（registeredports）：从1024到49151。它们松散地绑定于一些服务。也就是说有许多服务绑定于这些端口，这些端口同样用于许多其它目的。例如：许多系统处理动态端口从1024左右开始。3）动态和/或私有端口（dynamicand/orprivateports）：从49152到65535。理论上，不应为服务分配这些端口。实际上，机器通常从1024起分配动态端口。但也有例外：sun的rpc端口从32768开始。你可以在命令行下输入“netstat-an”来查看已经打开的端口“netstat-a-n”，按下回车键后就可以看到以数字形式显示的tcp和udp连接的端口号及状态。netstat命令用法命令格式：netstat-a-e-n-o-s－an-a表示显示所有活动的tcp连接以及计算机监听的tcp和udp端口。-e表示显示以太网发送和接收的字节数、数据包数等。-n表示只以数字形式显示所有活动的tcp连接的地址和端口号。-o表示显示活动的tcp连接并包括每个连接的进程id（pid）。-s 表示按协议显示各种连接的统计信息，包括端口号。也可以通过防火墙的ip规则来管理端口！

TCP/IP协议端口一栏表 _____# GoSH portlist compiled by Julian Assange - proff@suburbuia.net## Please send any additions / clarifications to strobe@suburbia.net#reserved 0/tcp Reserved [JBP]reserved 0/udp Reserved [JBP]tcpmux1/tcp TCP Port Service Multiplexer [MKL]tcpmux1/udp TCP Port Service Multiplexer [MKL]compressnet 2/tcp Management Utility [BV15]compressnet 2/udp Management Utility [BV15]compressnet 3/tcp Compression Process [BV15]compressnet 3/udp Compression Process [BV15]rje5/tcp Remote Job Entry [12,JBP]rje5/udp Remote Job Entry [12,JBP]echo7/tcp Echo [95,JBP]echo7/udp Echo [95,JBP]discard9/tcp Discard [94,JBP]discard9/udp Discard [94,JBP]systat 11/tcp Active Users [89,JBP]systat 11/udp Active Users [89,JBP]daytime 13/tcp Daytime [93,JBP]daytime 13/udp Daytime [93,JBP]netstat 15/tcp Netstatqotd 17/tcp Quote of the Day [100,JBP]qotd 17/udp Quote of the Day [100,JBP]msp 18/tcp Message Send Protocol [RXN]msp 18/udp Message Send Protocol [RXN]chargen 19/tcp ttytst source Character Generatorchargen 19/udp ttytst source Character Generatorftp-data20/tcp File Transfer [Default Data] [96,JBP]ftp-data20/udp File Transfer [Default Data] [96,JBP]ftp 21/tcp File Transfer [Control] [96,JBP]ftp 21/udp File Transfer [Control] [96,JBP]ssh 22/tcp Secure Shell - RSA encrypted rshtelnet 23/tcp Telnet [112,JBP]telnet 23/udp Telnet [112,JBP]priv-mail24/tcp any private mail system [RA11]priv-mail24/udp any private mail system [RA11]smtp 25/tcp Simple Mail Transfer [102,JBP]smtp 25/udp Simple Mail Transfer [102,JBP]nsw-fe 27/tcp NSW User System FE [24,RHT]nsw-fe 27/udp NSW User System FE [24,RHT]msg-icp 29/tcp MSG ICP [85,RHT]msg-icp 29/udp MSG ICP [85,RHT]msg-auth31/tcp MSG Authentication [85,RHT]msg-auth31/udp MSG Authentication [85,RHT]dsp 33/tcp Display Support Protocol [EXC]dsp 33/udp Display Support Protocol [EXC]priv-print35/tcp any private printer server [JBP]priv-print35/udp any private printer server [JBP]time 37/tcp Time [108,JBP]time 37/udp Time [108,JBP]rap 38/tcp Route Access Protocolrap 38/udp Route Access Protocolrlp 39/tcp resource Resource Location Protocolrlp 39/udp resource Resource Location Protocolgraphics41/tcp Graphics [129,JBP]graphics41/udp Graphics [129,JBP]nameserver42/tcp Host Name Server [99,JBP]nameserver42/udp Host Name Server [99,JBP]nicname 43/tcp Who Is [55,ANM2]nicname 43/udp Who Is [55,ANM2]mpm-flags44/tcp MPM FLAGS Protocol [JBP]mpm-flags44/udp MPM FLAGS Protocol [JBP]mpm 45/tcp Message Processing Module [recv] [98,JBP]mpm 45/udp Message Processing Module [recv] [98,JBP]mpm-snd 46/tcp MPM [default send] [98,JBP]mpm-snd 46/udp MPM [default send] [98,JBP]ni-ftp 47/tcp NI FTP [134,SK8]ni-ftp 47/udp NI FTP [134,SK8]auditd 48/tcp Digital Audit Daemonauditd 48/udp Digital Audit Daemonlogin 49/tcp Login Host Protocol [PHD1]login 49/udp Login Host Protocol [PHD1]re-mail-ck50/tcp Remote Mail Checking Protocol [171,SXD1]re-mail-ck50/udp Remote Mail Checking Protocol [171,SXD1]la-maint51/tcp IMP Logical Address Maintenance [76,AGM]la-maint51/udp IMP Logical Address Maintenance [76,AGM]xns-time52/tcp XNS Time Protocol [SXA]xns-time52/udp XNS Time Protocol [SXA]domain 53/tcp Domain Name Server [81,95,PM1]domain 53/udp Domain Name Server [81,95,PM1]xns-ch 54/tcp XNS Clearinghouse [SXA]xns-ch 54/udp XNS Clearinghouse [SXA]isi-gl 55/tcp ISI Graphics Language [7,RB9]isi-gl 55/udp ISI Graphics Language [7,RB9]xns-auth56/tcp XNS Authentication [SXA]xns-auth56/udp XNS Authentication [SXA]mtp 57/tcp deprecatedpriv-term57/tcp any private terminal access [JBP]priv-term57/udp any private terminal access [JBP]xns-mail58/tcp XNS Mail [SXA]xns-mail58/udp XNS Mail [SXA]priv-file59/tcp any private file service [JBP]priv-file59/udp any private file service [JBP]ni-mail 61/tcp NI MAIL [5,SK8]ni-mail 61/udp NI MAIL [5,SK8]acas 62/tcp ACA Services [EXW]acas 62/udp ACA Services [EXW]via-ftp 63/tcp VIA Systems - FTP [DXD]via-ftp 63/udp VIA Systems - FTP [DXD]whois++ 63/tcpwhois++ 63/udpcovia 64/tcp Communications Integrator (CI) [TXD]covia 64/udp Communications Integrator (CI) [TXD]tacacs-ds65/tcp TACACS-Database Service [3,KH43]tacacs-ds65/udp TACACS-Database Service [3,KH43]sql*net 66/tcp Oracle SQL*NET [JFH2]sql*net 66/udp Oracle SQL*NET [JFH2]bootps 67/tcp Bootstrap Protocol Server [36,WJC2]bootps 67/udp Bootstrap Protocol Server [36,WJC2]bootpc 68/tcp Bootstrap Protocol Client [36,WJC2]bootpc 68/udp Bootstrap Protocol Client [36,WJC2]tftp 69/tcp Trivial File Transfer [126,DDC1]tftp 69/udp Trivial File Transfer [126,DDC1]gopher 70/tcp Gopher [MXC1]gopher 70/udp Gopher [MXC1]netrjs-171/tcp Remote Job Service [10,RTB3]netrjs-171/udp Remote Job Service [10,RTB3]netrjs-272/tcp Remote Job Service [10,RTB3]netrjs-272/udp Remote Job Service [10,RTB3]netrjs-373/tcp Remote Job Service [10,RTB3]netrjs-373/udp Remote Job Service [10,RTB3]netrjs-474/tcp Remote Job Service [10,RTB3]netrjs-474/udp Remote Job Service [10,RTB3]priv-dial75/tcp any private dial out service [JBP]priv-dial75/udp any private dial out service [JBP]deos 76/tcp Distributed External Object Storedeos 76/udp Distributed External Object Storenetrjs 77/tcppriv-rje77/tcp any private RJE service [JBP]priv-rje77/udp any private RJE service [JBP]vettcp 78/tcp vettcp [CXL1]vettcp 78/udp vettcp [CXL1]finger 79/tcp Finger [52,KLH]finger 79/udp Finger [52,KLH]http 80/tcp www www-http World Wide Web HTTPhttp 80/udp www www-http World Wide Web HTTPwww 80/tcp World Wide Web HTTP [TXL]www 80/udp World Wide Web HTTP [TXL]hosts2-ns81/tcp HOSTS2 Name Server [EAK1]hosts2-ns81/udp HOSTS2 Name Server [EAK1]xfer 82/tcp XFER Utility [TXS2]xfer 82/udp XFER Utility [TXS2]mit-ml-dev83/tcp MIT ML Device [DXR3]mit-ml-dev83/udp MIT ML Device [DXR3]ctf 84/tcp Common Trace Facility [HXT]ctf 84/udp Common Trace Facility [HXT]mit-ml-dev85/tcp MIT ML Device [DXR3]mit-ml-dev85/udp MIT ML Device [DXR3]mfcobol 86/tcp Micro Focus Cobol [SXE]mfcobol 86/udp Micro Focus Cobol [SXE]priv-term-l87/tcp any private terminal link [JBP]priv-term-l87/udp any private terminal link [JBP]ttylink 87/tcpkerberos88/tcp Kerberos [BCN]kerberos88/udp Kerberos [BCN]su-mit-tg89/tcp SU/MIT Telnet Gateway [MRC]su-mit-tg89/udp SU/MIT Telnet Gateway [MRC]dnsix 90/tcp DNSIX Securit Attribute Token Map [CXW1]dnsix 90/udp DNSIX Securit Attribute Token Map [CXW1]mit-dov 91/tcp MIT Dover Spooler [EBM]mit-dov 91/udp MIT Dover Spooler [EBM]npp 92/tcp Network Printing Protocol [LXM]npp 92/udp Network Printing Protocol [LXM]dcp 93/tcp Device Control Protocol [DT15]dcp 93/udp Device Control Protocol [DT15]objcall 94/tcp Tivoli Object Dispatcher [TXB1]objcall 94/udp Tivoli Object Dispatcher [TXB1]supdup 95/tcp SUPDUP [27,MRC]supdup 95/udp SUPDUP [27,MRC]dixie 96/tcp DIXIE Protocol Specification [TXH1]dixie 96/udp DIXIE Protocol Specification [TXH1]swift-rvf97/tcp Swift Remote Vitural File Protocol [MXR]swift-rvf97/udp Swift Remote Vitural File Protocol [MXR]tacnews 98/tcp TAC News [ANM2]tacnews 98/udp TAC News [ANM2]metagram99/tcp Metagram Relay [GEOF]metagram99/udp Metagram Relay [GEOF]newacct100/tcp [unauthorized use]hostname 101/tcp hostnames NIC Host Name Serverhostname 101/udp hostnames NIC Host Name Serveriso-tsap 102/tcp tsap ISO-TSAP Class 0iso-tsap 102/udp tsap ISO-TSAP Class 0gppitnp103/tcp Genesis Point-to-Point Trans Net [PXM1]gppitnp103/udp Genesis Point-to-Point Trans Net [PXM1]x400103/tcp ISO Mailacr-nema 104/tcp ACR-NEMA Digital Imag. & Comm. 300 [PXM1]acr-nema 104/udp ACR-NEMA Digital Imag. & Comm. 300 [PXM1]x400-snd 104/tcp ISO Mailcsnet-ns 105/tcp Mailbox Name Nameserver [127,MS56]csnet-ns 105/udp Mailbox Name Nameserver [127,MS56]3com-tsmux 106/tcp 3COM-TSMUX [JXS5]3com-tsmux 106/udp 3COM-TSMUX [JXS5]rtelnet107/tcp Remote Telnet Service [101,JBP]rtelnet107/udp Remote Telnet Service [101,JBP]snagas108/tcp SNA Gateway Access Server [KXM]snagas108/udp SNA Gateway Access Server [KXM]pop2109/tcp postoffice Post Office Protocol - Version 2pop2109/udp postoffice Post Office Protocol - Version 2pop3110/tcp Post Office Protocol - Version 3 [122,MTR]pop3110/udp Post Office Protocol - Version 3 [122,MTR]sunrpc111/tcp rpcbind SUN Remote Procedure Callsunrpc111/udp rpcbind SUN Remote Procedure Callmcidas112/tcp McIDAS Data Transmission Protocol [GXD]mcidas112/udp McIDAS Data Transmission Protocol [GXD]auth113/tcp Authentication Service [130,MCSJ]auth113/udp Authentication Service [130,MCSJ]audionews 114/tcp Audio News Multicast [MXF2]audionews 114/udp Audio News Multicast [MXF2]sftp115/tcp Simple File Transfer Protocol [73,MKL1]sftp115/udp Simple File Transfer Protocol [73,MKL1]ansanotify 116/tcp ANSA REX Notify [NXH]ansanotify 116/udp ANSA REX Notify [NXH]uucp-path 117/tcp UUCP Path Service [44,MAE]uucp-path 117/udp UUCP Path Service [44,MAE]sqlserv118/tcp SQL Services [LXB3]sqlserv118/udp SQL Services [LXB3]nntp119/tcp Network News Transfer Protocol [65,PL4]nntp119/udp Network News Transfer Protocol [65,PL4]cfdptkt120/tcp CFDPTKT [JXO3]cfdptkt120/udp CFDPTKT [JXO3]erpc121/tcp Encore Expedited Remote Pro.Call [132,JXO]erpc121/udp Encore Expedited Remote Pro.Call [132,JXO]smakynet 122/tcp SMAKYNET [MXO]smakynet 122/udp SMAKYNET [MXO]ntp123/tcp Network Time Protocol [80,DLM1]ntp123/udp Network Time Protocol [80,DLM1]ansatrader 124/tcp ANSA REX Trader [NXH]ansatrader 124/udp ANSA REX Trader [NXH]locus-map 125/tcp Locus PC-Interface Net Map Ser [137,EP53]locus-map 125/udp Locus PC-Interface Net Map Ser [137,EP53]unitary126/tcp Unisys Unitary Login [FEIL]unitary126/udp Unisys Unitary Login [FEIL]locus-con 127/tcp Locus PC-Interface Conn Server [137,EP53]locus-con 127/udp Locus PC-Interface Conn Server [137,EP53]gss-xlicen 128/tcp GSS X License Verification [JXL]gss-xlicen 128/udp GSS X License Verification [JXL]pwdgen129/tcp Password Generator Protocol [141,FJW]pwdgen129/udp Password Generator Protocol [141,FJW]cisco-fna 130/tcp cisco FNATIVE [WXB]cisco-fna 130/udp cisco FNATIVE [WXB]cisco-tna 131/tcp cisco TNATIVE [WXB]cisco-tna 131/udp cisco TNATIVE [WXB]cisco-sys 132/tcp cisco SYSMAINT [WXB]cisco-sys 132/udp cisco SYSMAINT [WXB]statsrv133/tcp Statistics Service [DLM1]statsrv133/udp Statistics Service [DLM1]ingres-net 134/tcp INGRES-NET Service [MXB]ingres-net 134/udp INGRES-NET Service [MXB]loc-srv135/tcp Location Service [JXP]loc-srv135/udp Location Service [JXP]profile136/tcp PROFILE Naming System [LLP]profile136/udp PROFILE Naming System [LLP]netbios-ns 137/tcp NETBIOS Name Service [JBP]netbios-ns 137/udp NETBIOS Name Service [JBP]netbios-dgm 138/tcp NETBIOS Datagram Service [JBP]netbios-dgm 138/udp NETBIOS Datagram Service [JBP]netbios-ssn 139/tcp NETBIOS Session Service [JBP]netbios-ssn 139/udp NETBIOS Session Service [JBP]emfis-data 140/tcp EMFIS Data Service [GB7]emfis-data 140/udp EMFIS Data Service [GB7]emfis-cntl 141/tcp EMFIS Control Service [GB7]emfis-cntl 141/udp EMFIS Control Service [GB7]bl-idm142/tcp Britton-Lee IDM [SXS1]bl-idm142/udp Britton-Lee IDM [SXS1]imap2143/tcp Interim Mail Access Protocol v2 [MRC]imap2143/udp Interim Mail Access Protocol v2 [MRC]NeWS144/tcp Window SystemNeWS144/udp Window Systemnews144/tcp NewS window system [JAG]news144/udp NewS window system [JAG]uaac145/tcp UAAC Protocol [DAG4]uaac145/udp UAAC Protocol [DAG4]iso-tp0146/tcp ISO-IP0 [86,MTR]iso-tp0146/udp ISO-IP0 [86,MTR]iso-ip147/tcp ISO-IP [MTR]iso-ip147/udp ISO-IP [MTR]cronus148/tcp CRONUS-SUPPORT [135,JXB]cronus148/udp CRONUS-SUPPORT [135,JXB]aed-512149/tcp AED 512 Emulation Service [AXB]aed-512149/udp AED 512 Emulation Service [AXB]sql-net150/tcp SQL-NET [MXP]sql-net150/udp SQL-NET [MXP]hems151/tcp HEMS [87,CXT]hems151/udp HEMS [87,CXT]bftp152/tcp Background File Transfer Program [AD14]bftp152/udp Background File Transfer Program [AD14]sgmp153/tcp SGMP [37,MS9]sgmp153/udp SGMP [37,MS9]netsc-prod 154/tcp NETSC [SH37]netsc-prod 154/udp NETSC [SH37]netsc-dev 155/tcp NETSC [SH37]netsc-dev 155/udp NETSC [SH37]sqlsrv156/tcp SQL Service [CMR]sqlsrv156/udp SQL Service [CMR]knet-cmp 157/tcp KNET/VM Command/Message Protocol[77,GSM11]knet-cmp 157/udp KNET/VM Command/Message Protocol[77,GSM11]pcmail-srv 158/tcp PCMail Server [19,MXL]pcmail-srv 158/udp PCMail Server [19,MXL]nss-routing 159/tcp NSS-Routing [JXR]nss-routing 159/udp NSS-Routing [JXR]sgmp-traps 160/tcp SGMP-TRAPS [37,MS9]sgmp-traps 160/udp SGMP-TRAPS [37,MS9]snmp161/tcp SNMP [15,MTR]snmp161/udp SNMP [15,MTR]snmptrap 162/tcp SNMPTRAP [15,MTR]snmptrap 162/udp SNMPTRAP [15,MTR]cmip-man 163/tcp CMIP/TCP Manager [4,AXB1]cmip-man 163/udp CMIP/TCP Manager [4,AXB1]cmip-agent 164/tcp CMIP/TCP Agentsmip-agent 164/udp CMIP/TCP Agentxns-courier 165/tcp Xerox 144,SXA]xns-courier 165/udp Xerox [144,SXA]s-net166/tcp Sirius Systems [BXL]s-net166/udp Sirius Systems [BXL]namp167/tcp NAMP [MS9]namp167/udp NAMP [MS9]rsvd168/tcp RSVD [NT12]rsvd168/udp RSVD [NT12]send169/tcp SEND [WDW11]send169/udp SEND [WDW11]print-srv 170/tcp Network PostScript [BKR]print-srv 170/udp Network PostScript [BKR]multiplex 171/tcp Network Innovations Multiplex [KXD]multiplex 171/udp Network Innovations Multiplex [KXD]cl/1172/tcp Network Innovations CL/1 [KXD]cl/1172/udp Network Innovations CL/1 [KXD]xyplex-mux 173/tcp Xyplex [BXS]xyplex-mux 173/udp Xyplex [BXS]mailq174/tcp MAILQ [RXZ]mailq174/udp MAILQ [RXZ]vmnet175/tcp VMNET [CXT]vmnet175/udp VMNET [CXT]genrad-mux 176/tcp GENRAD-MUX [RXT]genrad-mux 176/udp GENRAD-MUX [RXT]xdmcp177/tcp X Display Manager Control Protocol [RWS4]xdmcp177/udp X Display Manager Control Protocol [RWS4]NextStep 178/udp nextstep NeXTStep NextStep Window Servernextstep 178/tcp NextStep NeXTStep NextStep Window Serverbgp179/tcp Border Gateway Protocol [KSL]bgp179/udp Border Gateway Protocol [KSL]ris180/tcp Intergraph [DXB]ris180/udp Intergraph [DXB]unify181/tcp Unify [VXS]unify181/udp Unify [VXS]audit182/tcp Unisys Audit SITP [GXG]audit182/udp Unisys Audit SITP [GXG]ocbinder 183/tcp OCBinder [JXO1]ocbinder 183/udp OCBinder [JXO1]ocserver 184/tcp OCServer [JXO1]ocserver 184/udp OCServer [JXO1]remote-kis 185/tcp Remote-KIS [RXD1]remote-kis 185/udp Remote-KIS [RXD1]kis186/tcp KIS Protocol [RXD1]kis186/udp KIS Protocol [RXD1]aci187/tcp Application Communication Interface [RXC1]aci187/udp Application Communication Interface [RXC1]mumps188/tcp Plus Five's MUMPS [HS23]mumps188/udp Plus Five's MUMPS [HS23]qft189/tcp Queued File Transport [WXS]qft189/udp Queued File Transport [WXS]cacp190/udp Gateway Access Control Protocolgacp190/tcp Gateway Access Control Protocolprospero 191/tcp Prospero Directory Serviceprospero 191/udp Prospero Directory Serviceosu-nms192/tcp OSU Network Monitoring System [DXK]osu-nms192/udp OSU Network Monitoring System [DXK]srmp193/tcp Spider Remote Monitoring Protocol [TXS]srmp193/udp Spider Remote Monitoring Protocol [TXS]irc194/tcp Internet Relay Chat Protocol [JXO2]irc194/udp Internet Relay Chat Protocol [JXO2]dn6-nlm-aud 195/tcp DNSIX Network Level Module Audit [LL69]dn6-nlm-aud 195/udp DNSIX Network Level Module Audit [LL69]dn6-smm-red 196/tcp DNSIX Session Mgt Module Audit Redir[LL69]dn6-smm-red 196/udp DNSIX Session Mgt Module Audit Redir[LL69]dls197/tcp Directory Location Service [SXB]dls197/udp Directory Location Service [SXB]dls-mon198/tcp Directory Location Service Monitor [SXB]dls-mon198/udp Directory Location Service Monitor [SXB]smux199/tcp SMUX [MTR]smux199/udp SMUX [MTR]src200/tcp IBM System Resource Controller [GXM]src200/udp IBM System Resource Controller [GXM]at-rtmp201/tcp AppleTalk Routing Maintenance [RXC]at-rtmp201/udp AppleTalk Routing Maintenance [RXC]at-nbp202/tcp AppleTalk Name Binding [RXC]at-nbp202/udp AppleTalk Name Binding [RXC]at-3203/tcp AppleTalk Unused [RXC]at-3203/udp AppleTalk Unused [RXC]at-echo204/tcp AppleTalk Echo [RXC]at-echo204/udp AppleTalk Echo [RXC]at-5205/tcp AppleTalk Unused [RXC]at-5205/udp AppleTalk Unused [RXC]at-zis206/tcp AppleTalk Zone Information [RXC]at-zis206/udp AppleTalk Zone Information [RXC]at-7207/tcp AppleTalk Unused [RXC]at-7207/udp AppleTalk Unused [RXC]at-8208/tcp AppleTalk Unused [RXC]at-8208/udp AppleTalk Unused [RXC]tam209/tcp Trivial Authenticated Mail Protocol [DXB1]tam209/udp Trivial Authenticated Mail Protocol [DXB1]z39.50210/tcp ANSI Z39.50 [MXN]z39.50210/udp ANSI Z39.50 [MXN]914c/g211/tcp Texas Instruments 914C/G Terminal [BXH1]914c/g211/udp Texas Instruments 914C/G Terminal [BXH1]anet212/tcp ATEXSSTR [JXT]anet212/udp ATEXSSTR [JXT]ipx213/tcp IPX [DP666]ipx213/udp IPX [DP666]vmpwscs214/tcp VM PWSCS [DXS]vmpwscs214/udp VM PWSCS [DXS]softpc215/tcp Insignia Solutions [MXT]softpc215/udp Insignia Solutions [MXT]atls216/tcp Access Technology License Server [LXD]atls216/udp Access Technology License Server [LXD]dbase217/tcp dBASE Unix [DXG1]dbase217/udp dBASE Unix [DXG1]mpp218/tcp Netix Message Posting Protocol [STY]mpp218/udp Netix Message Posting Protocol [STY]uarps219/tcp Unisys ARPs [AXM1]uarps219/udp Unisys ARPs [AXM1]imap3220/tcp Interactive Mail Access Protocol v3 [JXR2]imap3220/udp Interactive Mail Access Protocol v3 [JXR2]fln-spx221/tcp Berkeley rlogind with SPX auth [KXA]fln-spx221/udp Berkeley rlogind with SPX auth [KXA]fsh-spx222/tcp Berkeley rshd with SPX auth [KXA]fsh-spx222/udp Berkeley rshd with SPX auth [KXA]rsh-spx222/tcp Berkeley rshd with SPX authrsh-spx222/udp Berkeley rshd with SPX authcdc223/tcp Certificate Distribution Center [KXA]cdc223/udp Certificate Distribution Center [KXA]sur-meas 243/tcp Survey Measurement [6,DDC1]sur-meas 243/udp Survey Measurement [6,DDC1]link245/tcp LINK [1,RDB2]link245/udp LINK [1,RDB2]dsp3270246/tcp Display Systems Protocol [39,WJS1]dsp3270246/udp Display Systems Protocol [39,WJS1]pdap344/tcp Prospero Data Access Protocol pdap344/udp Pros
文件，检查是否正常传输 udp是面向非连接的不可靠的协议，适用于传输一次性小批量的文件，不对传输数据报进行检查tcp需要先建立连接才能通话udp不需要，实时性要高点tcp可以形象比喻为打电话的过程，udp可以比喻为发短信的过程tcp不能发送广播和组播，只能单播udp可以广播和组播以上是个人所知，描述不够详尽 可以看看这个