Documents about User Datagram Protocol
L14-Review
Allan Hancock College, MIP 31089
Excerpt: ... REVIEW for EXAM Introduction Wireless LANs 802.11, Hiperlan (2) Bluetooth (2) WML/WMLScript Applications Internet Mobile IP (2) TCP congestion control over Wireless networks Mobile Adhoc networks Integrating Mobile and Fixed IP networks Mi ...
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rfc840
Dallas, EE 6345
Excerpt: ... st Level User Datagram Protocol (UDP) STATUS: Recommended SPECIFICATION: RFC 768 (in IPTW) COMMENTS: The only change noted for the UDP specification is a minor clarification that if in computing the checksum a padding octet is used for the computation it is not transmitted or counted in the length. OTHER REFERENCES: DEPENDENCIES: Internet Protocol CONTACT: Postel@USC-ISIF Postel [Page 4] RFC 840 April 1983 Official Protocols Transmission Control Protocol (TCP) STATUS: Recommended SPECIFICATION: RFC 793 (in IPTW) COMMENTS: Many comments and corrections have been received for the TCP specification document. These are primarily document bugs rather than protocol bugs. Event Processing ...
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rfc0840
Arkansas Tech, CS 4303
Excerpt: ... HER REFERENCES: DEPENDENCIES: Internet Protocol CONTACT: Postel@USC-ISIF Host Level User Datagram Protocol (UDP) STATUS: Recommended SPECIFICATION: RFC 768 (in IPTW) COMMENTS: The only change noted for the UDP specification is a minor clarification that if in computing the checksum a padding octet is used for the computation it is not transmitted or counted in the length. OTHER REFERENCES: DEPENDENCIES: Internet Protocol CONTACT: Postel@USC-ISIF Postel [Page 4] RFC 840 April 1983 Official Protocols Transmission Control Protocol (TCP) STATUS: Recommended SPECIFICATION: RFC 793 (in IPTW) COMMENTS: Many comments and corrections have been received for the TCP s ...
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CPSC5157_L19
Columbus State University, CPSC 5157
Excerpt: ... CPSC 5157 Lecture 19 Computer Networks Wednesday, July 12, 2006 Topics: Chapter 24: UDP User Datagram Protocol Why Study UDP? HosttoHost Transport vs. EndtoEnd Transport UDP Services UDP Datagram Format UDP Encapsulation Advantages of UDP Chapter 25: TCP and Reliable Transport Service The Need for A Reliable Transport Service TCP Services Slide 1 of 9 slides Lecture 19 Revised July 12, 2006 CPSC 5157 Computer Networks Lecture for Wednesday, July 12, 2006 Why Study UDP? Most of our work will focus on TCP. So why study UDP? 1. As we shall see, UDP is quite useful for a number of applications. 2. UDP addresses a number of issues that are also addressed by TCP. 3. UDP is simpler and avoids some of the complexities associated with a reliable service provider. The bottom line is that we shall study the issues common to UDP and TCP within the context of the simpler UDP protocol. Slide 2 of 9 slides Lecture 19 Revised July 12, 2006 CPSC 5157 Computer Networks Lecture for Wednesday, July 12, 200 ...
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finalexam-studyguide
DePaul, TDC 375
Excerpt: ... . Internet Protocol (IP) A. Addressing B. IPv4 addressing issues and solutions C. IPv6 III. Network Control A. ARP B. DHCP C. ICMP IV. Routing Protocols A. Static B. RIP C. OSPF D. BGP V. IP Multicast A. Addressing B. IP to Ethernet MAC mapping C. IGMP D. DVMRP E. PIM-DM F. PIM-SM G. MBGP H. MSDP VI. Transmission Control Protocl (TCP) A. Reliability B. Flow Control C. Connection setup, data transfer and connection termination phases D. Congestion control and avoidance mechanisms VII. User Datagram Protocol (UDP) A. Usage VIII. Network Management A. Simple Network Management Protocol (SNMP) IX. Random Early Detection (RED) and Explicit Congestion Notification (ECN) A. Basic operations X. Network Security A. Firewalls and permiter security B. Intrusion Detection Systems C. Network-based attacks The final exam is comprehensive. You should use the midterm and the midterm study guide for additiona ...
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summary1
Air Force Academy, CS 557
Excerpt: ... Summary 1: Jan 5-Jan 9 WWW=disttributed hypermedia system built on internet services; set of protocols & standards; it is NOT the internet or TCP. WWW programming: Developing Internet Applications and Distributed Systems Layers: 5: Application Layer - HTTP, POP3 4: Transport Layer - TCP, UDP 3: Network/Internet Layer - IP4 2: Data Link Layer - 802.11, Internet 1: Physical Layer - Modems, Twisted pair cable TCP: Transport Coltrol Protocol; used for WWW UDP: User Datagram Protocol ; used for video People of note: D. Davis, P. Baran, L. Kleinrock: idea of packet switching 1960 62-69 DARPA - Defense Advanced Research Projects Agency - supports packet switching network Tim Berners-Lee - Wrote about Information Management for CERN - became WWW 89-91 Marc Andreessen - Wrote Mosaic browser 1993 Tim O'Reilly - Big name in Documentation and Web 2.0 Jeffrey Preston Bezos - Amazon Evolution of Web: Platform - web as application pla ...
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lec18-outline
Berkeley, CS 122
Excerpt: ... 1 EECS 122, Lecture 18 Today Topics: s Review of Where We Are Introduction to Transport Layer UDP: The User Datagram Protocol Introduction to Reliability Kevin Fall, kfall@cs.berkeley.edu kfall@cs.berkeley. 2 Where We Are So Far Networking concepts remote access to resources controlled sharing multiplexing: TDM, Stat Mux protocols and layering ISO reference model, encapsulation service model, error detection end-to-end argument soft state 3 Where We Are So Far Development of the Internet interconnection of heterogeneous networks simple best-effort service model fully-connected graph of hosts (routing) Internet scaling issues use of hierarchies in routing, addresses, DNS use of caching in DNS 4 Where We Are So Far Direct-link networks 1 signals, modulation, error detection best-effort delivery between attached stations possible error correction using codes MAC protocols, Ethernet 5 Where We Are So Far ...
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UDP
Syracuse, CIS 758
Excerpt: ... Fall 2006, Syracuse University Lecture Notes for Internet Security UDP Protocols (1) UDP: User Datagram Protocol Why need UDP (or TCP) On a single host, there might be many application programs IP only identifies host, not application programs running on host We need another thing to distinguish one application from another, so when the TCP/IP software receives a packet, it knows which program to send to. TCP/IP uses protocol port number to distinguish programs. Application programs bind themselves to port numbers. Both TCP and UDP have port numbers. They are different. UDP Transport-layer protocol Connectionless service Same best-effort semantics as IP Messages can be delayed, lost, or duplicated Messages can arrive out of order Application accepts full responsibility for errors UDP-based applications DNS: Normal hosts query DNS servers using UDP in practice Streaming video, Voice-over-IP Encapsulation UDP Message Format Wenliang Du ...
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lec3
CUNY Baruch, CIS 3
Excerpt: ... speed of servers open systems a system whose architecture is not a secret prime example: UNIX, LINUX runs on many hardware platforms; LINUX is free protocol rules for how computers communicate with each other TCP: transmission control protocol (computer computer) UDP: user datagram protocol IP: internet protocol HTTP: hypertext transfer protocol (computer browser) distributed system multiple computers are distributed geographically example: banking system network concepts network topologies bus (linear model; inexpensive to run cables, but not robust to node failure) ring (example: IBM token ring) star (book calls it hub; can be expensive to run cables, but robust to node failure) layered models: OSI (below) is the classic model 2 Open System Interconnection (OSI) reference model also called the 7-layer model: 1. application layer (displays data, communicates with lower layers via presentation layer) 2. prese ...
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IST220_Fall07_UDP_protocol
Penn State, IST 220
Excerpt: ... IST220 Networking and Telecommunications Chapter 24: UDP Datagram Transport Service Fall 2007 Company LOGO Angsana A. Techatassanasoontorn Where is UDP in TCP/IP Protocol? User Datagram Protocol (UDP) Transport Control Protocol (TCP) Angsana A. Techatassanasoontorn Internet Applications Angsana A. Techatassanasoontorn What kind of services UDP provide? Connectionless service Low overhead Message-oriented interface Best-effort delivery Angsana A. Techatassanasoontorn User Datagram Protocol Used with IP Example of port numbers: 20(Echo) Angsana A. Techatassanasoontorn UDP Encapsulation Angsana A. Techatassanasoontorn ...
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presentationToddandAsh
Clarkson, WEB 2
Excerpt: ... fo rm or e! User Datagram Protocol (UDP) What is it? A protocol that allows for fast data transfer Does not establish connection (connectionless) Makes a best effort to transfer data Not very reliable! User Datagram Protocol (UDP) No Handshaking! Se n di No Reliable data transfer No Flow Control No Congestion Control Se nd Se nd i ng ng g in da ta ! ta ! da da ta ! TCP vs. UDP Stream-oriented Datagram-oriented Connection established Connectionless Good network citizen Blasts Away Congestion control Flow control No congestion control No flow control Reliable Best-effort Research Questions TCP UDP Elegant Protocol Lots of nice features Slower Barebones Protocol Lacks reliability Faster How much do we pay to use TCP? How do we measure performance? What causes the differences in performance? Measuring Network Traffic Basic terminology: ...
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CCNA_Ch02
CSU LA, CS 447
Excerpt: ... on Protocol (DHCP)/BootP Wiley Inc. 2006. All Rights Reserved. (Bootstrap Protocol) TCP/IP and the DoD Model Host-to-Host Layer Protocols Transmission Control Protocol (TCP) Header Wiley Inc. 2006. All Rights Reserved. Transport Layer Overview Application Transport Transmission Control Protocol (TCP) User Datagram Protocol (UDP) ConnectionOriented Connectionless NNTP(119), HTTP (80), HTTPS (443), Telnet (23), FTP (21), SMTP (25): TCP TFTP (69), SNMP(161): UDP DNS (53): both TCP and UDP Wiley Inc. 2006. All Rights Reserved. Transmission Control Protocol (TCP) Connectionoriented services Uses virtual circuits (threeway handshake) Enables devices to send large quantities of data using windowing in a connectionoriented manner Uses acknowledgements Considered reliable Dest Port Source Ack. Window Sequence Port Number number number . CRC Data Segment Wiley Inc. 2006. All Rights Reserved. TCP/IP and the DoD Model HosttoHost Layer Protocols User Datagram Protocol (UDP) Header ...
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CCNA_Ch02
CUNY Baruch, CS 707
Excerpt: ... on Protocol (DHCP)/BootP Wiley Inc. 2006. All Rights Reserved. (Bootstrap Protocol) TCP/IP and the DoD Model Host-to-Host Layer Protocols Transmission Control Protocol (TCP) Header Wiley Inc. 2006. All Rights Reserved. Transport Layer Overview Application Transport Transmission Control Protocol (TCP) User Datagram Protocol (UDP) ConnectionOriented Connectionless NNTP(119), HTTP (80), HTTPS (443), Telnet (23), FTP (21), SMTP (25): TCP TFTP (69), SNMP(161): UDP DNS (53): both TCP and UDP Wiley Inc. 2006. All Rights Reserved. Transmission Control Protocol (TCP) Connectionoriented services Uses virtual circuits (threeway handshake) Enables devices to send large quantities of data using windowing in a connectionoriented manner Uses acknowledgements Considered reliable Dest Port Source Ack. Window Sequence Port Number number number . CRC Data Segment Wiley Inc. 2006. All Rights Reserved. TCP/IP and the DoD Model HosttoHost Layer Protocols User Datagram Protocol (UDP) Header ...
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lec18
Berkeley, CS 122
Excerpt: ... EECS 122, Lecture 18 Today Topics: s Review of Where We Are Introduction to Transport Layer UDP: The User Datagram Protocol Introduction to Reliability Kevin Fall, kfall@cs.berkeley.edu Where We Are So Far Networking concepts remote access to resources controlled sharing multiplexing: TDM, Stat Mux protocols and layering ISO reference model, encapsulation service model, error detection end-to-end argument soft state Where We Are So Far Development of the Internet interconnection of heterogeneous networks simple best-effort service model fully-connected graph of hosts (routing) Where We Are So Far Direct-link networks signals, modulation, error detection best-effort delivery between attached stations possible error correction using codes MAC protocols, Ethernet Internet scaling issues use of hierarchies in routing, addresses, DNS use of caching in DNS Where We Are So Far The Internet Protocol IP service ...
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CPSC5157_L18
Columbus State University, CPSC 5157
Excerpt: ... CPSC 5157 Lecture 18 Computer Networks Tuesday, July 11, 2006 Topics: Chapter 23: An Error Reporting Mechanism (ICMP) Internet Control Message Protocol ICMP Message Transport and Use of IP IPv4 Header and Sample Types Traceroute, Ping, and ICMP Note that some of this material repeats topics mentioned earlier. Slide 1 of 5 slides Lecture 18 Revised July 12, 2006 CPSC 5157 Computer Networks Lecture for Tuesday, July 11 Internet Control Message Protocol We now begin a discussion of three services, each of which uses IP as a logical transport mechanism. ICMP Internet Control Message Protocol UDP User Datagram Protocol TCP Transmission Control Protocol The ICMP was designed as a way to diagnose network problems, but seems to have grown considerably as new uses (e.g., Traceroute and Ping) were developed. Figure 23.1 on page 357 of the textbook lists the ICMP messages. A few of the more interesting message types are as follows: 0 Echo reply (used in Ping) 3 Destination Unreachable (an error message) 4 Sour ...
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lecture21_student
Evansville, EE 458
Excerpt: ... EE458 - Embedded Systems Lecture 21 Networking Lecture 21 Networking TCP and UDP Outline TCP versus UDP Introduction to Sockets There are two TCP/IP transport protocols: TCP (Transport Control Protocol) and UDP ( User Datagram Protocol ). UDP is a simple, , datagram protocol. UDP is faster than TCP. TCP is a sophisticated, reliable, byte-stream (unlimited length) protocol. References Netburner Network Prog. Manual (Chs 11-12) Netburner Runtime Library (Ch 21) 1 2 Lecture 21 Networking TCP and UDP Lecture 21 Networking TCP and UDP There is no guarantee that a UDP datagram will reach its destination. To ensure delivery our application must handle time-outs, , retransmissions, etc. UDP is a connectionless protocol. TCP provides a connection between two machines. When data is sent via TCP to the other end, it requires an acknowledgment. If one is not received the data will be resent. 3 TCP provides sequencing. When a large amount of data is sent via TCP, the data will be sent in ...
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Lecture39
Virginia Tech, CS 3204
Excerpt: ... erver model client host requests, receives service from always-on server e.g. Web browser/server; email client/server flow control: sender won't overwhelm receiver peer-peer model: minimal (or no) use of dedicated servers e.g. Gnutella, KaZaA CS 3204 Spring 2006 4/26/2006 5 TCP - Transmission Control Protocol Internet's connectionoriented service congestion control: senders "slow down sending rate" when network congested 4/26/2006 6 CS 3204 Spring 2006 1 Connectionless service Goal: data transfer between end systems same as before! The Network Core the fundamental question: how is data transferred through net? circuit switching: dedicated circuit per call: (old) telephone net packet-switching: data sent thru net in discrete "chunks" How are the network's resources shared? CS 3204 Spring 2006 4/26/2006 8 App's using TCP: HTTP (Web), ssh (remote login), SMTP (email), Bittorrent (file-sharing), XMPP (instant messenging) UDP - User Datagram Protocol [RFC 768]: con ...
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chap03bv
Columbus State University, CSC 6128
Excerpt: ... is unreliabledoes not correct errors in each hop between routers This is good: reduces the work each router along the route must do 6 Figure 3-2: TCP/IP Standards (Study Figure) Transport Layer Standards Transmission Control Protocol (TCP) Reliable and connection-oriented service at the transport layer Corrects errors User Datagram Protocol (UDP) Unreliable and connectionless service at the transport layer Lightweight protocol good when catching errors is not important 7 Figure 3-7: Internet and Transport Layers Transport Layer End-to-End (Host-to-Host) TCP is Connection-Oriented, Reliable UDP is Connectionless Unreliable Client PC Server Internet Layer (Usually IP) Hop-by-Hop (Host-Router or Router-Router) Connectionless, Unreliable Router 1 Router 2 Router 3 8 Figure 3-2: TCP/IP Standards (Study Figure) Application Layer To govern communication between application programs, which may be written by different vendors Document transfer versus docume ...
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Assignment 2
Deakin, SIT 3334
Excerpt: ... SIT202 Computer Networks Assignment 2 Task 1: The transport layer By: Ruo Hui NIU ID: 600246619 SIT202 Computer Networks Assignment 2 1. Define, compare and contrast TCP and UDP. Ruo Hui NIU ID: 600246619 The most important difference between T ...
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3911
University of the West Indies at Mona, ACS 3911
Excerpt: ... ues Transport Protocol Elements Elementary Protocols Sliding Window Protocols The User Datagram Protocol (UDP) The Transmission Control Protocol (TCP) 7. The Application Layer Sockets The Domain Name Service (DNS) WWW (HTTP) 2 ...
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CSCI6268L20
Colorado, CSCI 6268
Excerpt: ... Foundations of Network and Computer Security John Black Lecture #20 Oct 17th 2007 CSCI 6268/TLEN 5831, Fall 2007 Announcements Project #0 Due on Friday Hand print-out in, in class If CAETE mail to Martin (See web page for Martin's email and OH) Martin's OH, Mondays, 11am, CSEL 122 Friday will be a midterm review session Tomorrow's Colloquium is my tenure talk Come if you like. not mandatory Networking Refresher For some of you this will be boring. sorry The basic model: Backbone (not a single line these days) ISP Et h ISP Et h LAN user1 LAN user2 Basic Networking Suppose user1 sends a UDP packet to user2, what happens? What's UDP? User Datagram Protocol Just like IP but with ports Well, first we need an IP address! What's an IP address For IPv4, it's a "dotted quad" of bytes Ex, 128.138.242.21 32 bits For IPv6, it's 128 bits 16 bytes in hex separated by colons Sending a UDP packet Assume IPv4 Get IP address via DNS Domain Name Service Distrib ...
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cs496-09
Milwaukee School of Engineering, CS 496
Excerpt: ... CS496 Lecture 09 W0708 12/20/2007 1 Limitations of IP Connectionless transfer No guarantee of delivery Lost, damaged, duplicated, out of order g p No validation Data portion of transfer is not checked No differentiation of payload Is it a web page or an e-mail? eIn effect host-to-host only! host-to- 2 User Datagram Protocol (UDP) Layer 4 Just above IP Adds two features Optional payload checksums Delivery between applications Ports Abstraction that identifies applications System independent 3 UDP Messages Header Source Port 2 octets (for replies) Destination Port 2 octets Message Length 2 octets (8 - ) ) Checksum 2 octets, optional Header and Body Body Data from the application using UDP NOTE IP addresses are handled by IP layer 2005-2007 by Henry L. Welch 1 CS496 Lecture 09 W0708 12/20/2007 4 UDP Pseudo-Header Provides validation of full address Including source and destination IP Not actually sent y Only used when checksums are on Violates strict layering rules! ...
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rfc901
Dallas, EE 6345
Excerpt: ... have not completed an implementation of IP if it does not include ICMP. OTHER REFERENCES: DEPENDENCIES: Internet Protocol CONTACT: Postel@USC-ISIF.ARPA Reynolds & Postel [Page 4] Official ARPA-Internet Protocols RFC 901 Host Level User Datagram Protocol (UDP) - STATUS: Recommended SPECIFICATION: RFC 768 (in IPTW) COMMENTS: Provides a datagram service to applications. Adds port addressing to the IP services. The only change noted for the UDP specification is a minor clarification that if in computing the checksum a padding octet is used for the computation it is not transmitted or counted in the length. OTHER REFERENCES: DEPENDENCIES: Internet Protocol CONTACT: Postel@USC-ISIF.ARPA Transmission Control Protocol (TCP) - ...
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rfc0901
Arkansas Tech, CS 4303
Excerpt: ... achable messages. Note that ICMP is defined to be an integral part of IP. You have not completed an implementation of IP if it does not include ICMP. OTHER REFERENCES: DEPENDENCIES: Internet Protocol CONTACT: Postel@USC-ISIF.ARPA Reynolds & Postel [Page 4] Official ARPA-Internet Protocols RFC 901 Host Level User Datagram Protocol (UDP) - STATUS: Recommended SPECIFICATION: RFC 768 (in IPTW) COMMENTS: Provides a datagram service to applications. Adds port addressing to the IP services. The only change noted for the UDP specification is a minor clarification that if in computing the checksum a padding octet is used for the computation it is not transmitted or counted in the length. OTHER REFERENCES: DEPENDENCIES: Inter ...
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