Reliable User Datagram Protocol

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Topic: Reliable User Datagram Protocol

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	User Datagram Protocol (UDP)
		The User Datagram Protocol (UDP) is a connectionless Transport (host-to-host) layer protocol.
		UDP is preferred over TCP when high performance or low network overhead is more critical than reliable delivery.
		UDP is the Transport layer protocol used with the
	www.measureup.com /testobjects/MS_NetEss/5a7770e.htm (115 words)

	UDP Protocol. Description and Packet Format
		User Datagram Protocol is utilized to send data that doesn't necessarily need to be very reliable.
		UDP is a simple to implement protocol because it does not require to keep track of every packet sent or received and it does not need to initiate or end a transmission.
		The UDP packet is encapsulated in an IP packet which in turn is encapsulated in a PPP packet.
	www.netfor2.com /udp.htm (213 words)

	User Datagram Protocol - Introduction to TCP/IP - Developer Fusion, the UK developer community - VB, ASP, C#, .NET, PHP and XML tutorials & source code
		UDP is sometimes referred to as an unreliable protocol because when a program sends a UDP datagram over the network, there is no way for it to know that it actually arrived at it's destination.
		User Datagram Protocol - Introduction to TCP/IP - Developer Fusion, the UK developer community - VB, ASP, C#,.NET, PHP and XML tutorials and source code
		Unlike TCP, the User Datagram Protocol (UDP) does not present data as a stream of bytes, nor does it require that you establish a connection with another program in order to exchange information.
	www.developerfusion.co.uk /show/28/3 (451 words)

	Reliable User Datagram Protocol - Wikipedia, the free encyclopedia
		In computer networking, the Reliable User Datagram Protocol (RUDP) is a transport layer protocol designed at Bell Labs for the Plan 9 operating system.
		It aims to provide a solution where UDP is too primitive because guaranteed-order packet delivery is desirable, but TCP adds too much complexity/overhead.
		It extends UDP by adding the following additional features:
	en.wikipedia.org /wiki/Reliable_User_Datagram_Protocol (157 words)

	[Appendix C] C.6 Transport Layer
		The User Datagram Protocol gives application programs direct access to a datagram delivery service, like the delivery service that IP provides.
		The two most important protocols in the Transport Layer are Transmission Control Protocol ( TCP) and User Datagram Protocol ( UDP).
		(As noted before, "unreliable" merely means that there are no techniques in the protocol for verifying that the data reached the other end of the network correctly.) Within your computer, UDP will deliver data correctly.
	ora-tcpip.h1.ru /firewall/appc_06.htm (157 words)

	RFC 1240 (rfc1240) - OSI connectionless transport services on top of UDP:
		[RFC768] Postel, J., "User Datagram Protocol", RFC 768, USC/Information Sciences Institute, September 1981.
		Using the approach of RFC 1006, this memo specifies how to offer OSI connectionless transport service using the User Datagram Protocol (UDP) [RFC768] of the TCP/IP suite.
		It is observed that the connection setup and tear-down protocol exchanges and complex connection-oriented protocol machines become unnecessary overheads for a simple request/response exchange between a client application and a server application, especially in reliable communications environments such as LAN and ISDN.
	www.faqs.org /rfcs/rfc1240.html (1459 words)

	A Famous Greeting
		The price the user pays for the lower overhead of datagram communications is exactly the lower reliability; it is often necessary for user-level protocols that use datagram communications to add their own reliability features on top of the basic communications.
		This is a duplex, reliable, sequenced byte-stream protocol, again layered on top of IP, and also providing the notion of ports.
		It is meant to be the basis for implementing and experimenting with transport-level protocols.(1) In the most general case, the sender has to supply the encapsulating header bytes in front of the packet and the receiver has to strip the additional bytes from the message.
	www.gnu.org /software/gawk/manual/gawkinet/gawkinet.txt (1459 words)

	[Appendix C] C.6 Transport Layer
		The two most important protocols in the Transport Layer are Transmission Control Protocol (TCP) and User Datagram Protocol (UDP).
		Applications that require the transport protocol to provide reliable data delivery use TCP because it verifies that data is delivered across the network accurately and in the proper sequence.
		Both protocols deliver data between the Application Layer and the Internet Layer.
	dylix.mine.nu:100 /oreilly/tcpip/firewall/appc_06.htm (1459 words)

	Transport layer - Wikipedia, the free encyclopedia
		(The datagram-type transport, User Datagram Protocol (UDP), provides neither error recovery, nor flow control, leaving these to the application.) The purpose of the Transport layer is to provide transparent transfer of data between end users, thus relieving the upper layers from any concern with providing reliable and cost-effective data transfer.
		In computing and telecommunications, the transport layer is layer four of the seven layer OSI model.
		The Transport layer uses this simplest set of options to implement whatever combinations of options are actually desired.
	en.wikipedia.org /wiki/Transport_layer (716 words)

	Protocol Engineering Lab - POC
		The Stream Control Transmission Protocol (SCTP) is a new transport protocol, existing at an equivalent level as UDP (User Datagram Protocol) and TCP (Transmission Control Protocol), which currently provide transport layer functions to all of the main Internet applications.
		As with TCP, SCTP provides a reliable transport service, ensuring that data is delievered from to the receiver without error and in the same sequence as transmitted.
		Two versions of POC have been proposed: reliable, which requires that all transmitted objects are eventually delivered, and unreliable, which permits the service to lose a subset of the objects.
	www.eecis.udel.edu /~amer/PEL/poc (1648 words)

	Transport layer - Wikipedia, the free encyclopedia
		(The datagram-type transport, User Datagram Protocol (UDP), provides neither error recovery, nor flow control, leaving these to the application.) The purpose of the Transport layer is to provide transparent transfer of data between end users, thus relieving the upper layers from any concern with providing reliable and cost-effective data transfer.
		In computing and telecommunications, the transport layer is layer four of the seven layer OSI model.
		The Transport layer uses this simplest set of options to implement whatever combinations of options are actually desired.
	en.wikipedia.org /wiki/Transport_layer (717 words)

	Settlement Program - Published Protocols
		The PGM Protocol is a reliable multicast transport protocol for applications that require ordered or unordered, duplicate-free, multicast data delivery from multiple sources to multiple receivers.
		The TCP/IP v4 protocol is used for host-to-host datagram service in a system of interconnected networks (catenet).
		The Kerberos protocol provides a means of verifying the identities of principals (for example, a workstation user or a network server) on an open (unprotected) network.
	www.microsoft.com /legal/protocols/protocols.asp (717 words)

	Transmission Control Protocol article - Transmission Control Protocol transport layer IETF TCP/IP network layer application layer - What-Means.com
		In many cases, the User Datagram Protocol (UDP) may be used in place of TCP when just application multiplexing services are required.
		Transmission Control Protocol (TCP) is a connection-oriented, reliable delivery byte-stream transport layer protocol currently documented in IETF RFC 793 [1] (http://www.ietf.org/rfc/rfc793.txt).
		However, TCP is not appropriate for many applications, and newer transport layer protocols are being designed and deployed to address some of the inherent weaknesses.
	www.what-means.com /encyclopedia/Transmission_Control_Protocol (1434 words)

	The Appletalk Protocol - Final Project CS337 - Chris Ashworth
		The main function of the LAP Manager is to act as a switching mechanism that connects the AppleTalk link-access protocol for the link type that the user selects to both the higher-level AppleTalk protocols and the lower-level hardware device driver for that data link.
		Although the AppleTalk protocol stack includes protocols that provide connection-oriented services, these protocols are built on top of the lower level datagram service.
		Higher-level protocols that use the services of DDP provide for reliable delivery of data.
	www.chrisashworth.org /classes/cs337 (1434 words)

	TCP (Transmission Control Protocol) (Linktionary term)
		TCP and UDP (User Datagram Protocol) are transport layer components that provide the connection point through which applications access network services.
		TCP is a connection-oriented protocol that provides the flow controls and reliable data delivery services listed next.
		TCP is described in RFC 793 (Transmission Control Protocol, September 1981).
	www.linktionary.com /t/tcp.html (2078 words)

	The Appletalk Protocol - Final Project CS337 - Chris Ashworth
		AppleTalk, like IP, is based upon a best-effort datagram delivery, relying on higher protocols to establish reliable connection-oriented communication.
		The main function of the LAP Manager is to act as a switching mechanism that connects the AppleTalk link-access protocol for the link type that the user selects to both the higher-level AppleTalk protocols and the lower-level hardware device driver for that data link.
		This document is intended to provide an introduction to the AppleTalk protocol stack, with specific focus on describing its characteristics as a set of protocols and comparing it to other networking models such as the OSI reference model and the TCP/IP reference model.
	www.chrisashworth.org /classes/cs337 (1514 words)

	The Appletalk Protocol - Final Project CS337 - Chris Ashworth
		AppleTalk, like IP, is based upon a best-effort datagram delivery, relying on higher protocols to establish reliable connection-oriented communication.
		The main function of the LAP Manager is to act as a switching mechanism that connects the AppleTalk link-access protocol for the link type that the user selects to both the higher-level AppleTalk protocols and the lower-level hardware device driver for that data link.
		This document is intended to provide an introduction to the AppleTalk protocol stack, with specific focus on describing its characteristics as a set of protocols and comparing it to other networking models such as the OSI reference model and the TCP/IP reference model.
	www.chrisashworth.org /classes/cs337 (1514 words)

	Learn more about Transport layer in the online encyclopedia.
		In the IP protocol Stack this function is achieved by the connection oriented Transmission Control Protocol (TCP) or the datagram type User Datagram Protocol (UDP).
		The purpose of the Transport layer is to provide transparent transfer of data between end users, thus relieving the upper layers from any concern with providing reliable and cost-effective data transfer.
		TCP is the more complicated, providing a connection and byte oriented stream which is almost error free, with flow control, multiple ports, and same order delivery.
	www.onlineencyclopedia.org /t/tr/transport_layer.html (1514 words)

	SIGTRAN - Wikipedia, the free encyclopedia
		SIGTRAN is the name given to an IETF working group that produced specifications for a family of protocols that provide reliable datagram service and user layer adaptations for SS7 and ISDN communications protocols.
		The SIGTRAN group was significantly influenced by telecommunications engineers intent on using the new protocols for adapting VoIP networks to the PSTN with special regard to signaling applications.
		The most significant protocol defined by the SIGTRAN group was the Stream Control Transmission Protocol (SCTP) which uses the Internet Protocol (IP) as its transport protocol.
	en.wikipedia.org /wiki/SIGTRAN (1514 words)

	RUDP: Reliable UDP (Reliable User Datagram Protocol) (RFC 908 1151)
		Reliable UDP (RUDP) is a simple packet based transport protocol, based on RFCs 980 (version 1) and 1151 (version 2), which is intended as a reliable protocol to transport telephony signalling across IP networks.
		Reliable UDP's congestion control mechanisms allow streams to behave in a TCP-friendly fashion without disturbing the real-time nature of the protocol.
		Protocol Structure - RUDP and RUDP v2 (Reliable UDP)
	www.javvin.com /protocolRUDP.html (1514 words)

	rfc1240.txt
		Using the approach of RFC 1006, this memo specifies how to offer OSI connectionless transport service using the User Datagram Protocol (UDP) [RFC768] of the TCP/IP suite.
		It is observed that the connection setup and tear-down protocol exchanges and complex connection-oriented protocol machines become unnecessary overheads for a simple request/response exchange between a client application and a server application, especially in reliable communications environments such as LAN and ISDN.
		The OSI connectionless upper layers are thought to be highly effective and efficient, both in time and space, for the distributed application classes mentioned above.
	ftp.cerias.purdue.edu /pub/doc/rfc/rfc1240.txt (1389 words)

	[Appendix C] C.6 Transport Layer
		The two most important protocols in the Transport Layer are Transmission Control Protocol (TCP) and User Datagram Protocol (UDP).
		Applications that require the transport protocol to provide reliable data delivery use TCP because it verifies that data is delivered across the network accurately and in the proper sequence.
		Both protocols deliver data between the Application Layer and the Internet Layer.
	dylix.mine.nu:100 /oreilly/tcpip/firewall/appc_06.htm (1389 words)

	SecuriTeam.com ™ - Check Point FireWall-1 RDP Bypass Vulnerability
		RDP (Reliable Data Protocol, but not the one specified in RFC 908, a Check Point proprietary one) is used by FireWall-1 on top of the User Datagram Protocol (UDP) to establish encrypted sessions.
		By adding a faked RDP header to normal UDP traffic, any content can be passed to port 259 on any remote host on either side of the firewall.
		Under some conditions, packets with RDP headers could be constructed which would be allowed across a VPN-1/FireWall-1 gateway without being explicitly allowed by the rule base.
	www.securiteam.com /securitynews/5YP012K4UU.html (519 words)

	Transport layer - Wikipedia, the free encyclopedia
		(The datagram-type transport, User Datagram Protocol (UDP), provides neither error recovery, nor flow control, leaving these to the application.) The purpose of the Transport layer is to provide transparent transfer of data between end users, thus relieving the upper layers from any concern with providing reliable and cost-effective data transfer.
		In computing and telecommunications, the transport layer is layer four of the seven layer OSI model.
		The Network layer doesn't generally guarantee that packets of data will arrive in the same order that they were sent, but often this is a desirable feature, so the Transport layer provides it.
	en.wikipedia.org /wiki/Transport_layer (519 words)

	Synchronize a Cisco router's clock with Network Time Protocol (NTP)
		NTP Version 3 is a standard—formalized in RFC 1305—that uses the User Datagram Protocol (UDP) and port 123.
		To ensure that your network devices display the most accurate time, you need to configure the NTP protocol and link your devices to a reliable time source.
		David Davis explains why Cisco devices need to use Network Time Protocol (NTP) for their time synchronization needs, and he tells you how to configure NTP on your Cisco devices.
	techrepublic.com.com /5100-1035_11-5712046.html (826 words)

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Topic: Reliable User Datagram Protocol

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