CSCI-131 Networking: the End-to-End Layer. Rodrigo Fonseca March 12 th, 2013
|
|
- Darlene Sparks
- 5 years ago
- Views:
Transcription
1 CSCI-131 Networking: the End-to-End Layer Rodrigo Fonseca March 12 th, 2013
2 Today Transport layer Provides useful abstractions for applications Uses (the fairly minimal) services provided by the network layer Corresponding text: Saltzer and Kaashoek, 7.5 and 7.6
3 Plan Transport layer introduction Factoring functionality End-to-end argument Multiplexing Reliability At least once At most once In-order Integrity Efficient use of medium Don t send faster than receiver can handle Don t send faster than the network can handle
4 Layers Application what the users sees, e.g., HTTP Presentation crypto, conversion between representations Session can tie together multiple streams (e.g., audio & video) Transport demultiplexes, provides reliability, flow and congestion control Network sends packets, using routing Data Link sends frames, handles media access Physical sends individual bits
5 Why not provide (*) on the network layer? Cost These functionalities are not free: don t burden those who don t need them Conflicting Timeliness and in-order delivery, for example Insufficient Example: reliability
6 End-to-end argument Functions placed at lower levels of a system may be redundant or of little value They may need to be performed at a higher layer anyway But they may be justified for performance reasons Or just because they provide most of what is needed Example: retransmissions Lesson: weigh the costs and benefits at each layer Also: the end also varies from case to case
7 Transport Protocols Why then not let the applications handle (*)? Applications have different requirements But many have common requirements "#$ -##$ ). #"#$ #%$ &'$ ($! )*# + )*#, )*#!
8 Transport protocol examples UDP Best-effort, datagram-based service Provides multiplexing Basic integrity (checksums) TCP Reliable, connection-based stream service In-order, exactly once delivery Congestion control Also provides multiplexing and basic integrity DCCP Unreliable, connection-based datagram service Congestion control Multiplexing and basic integrity Many others
9 Plan Transport layer introduction Factoring functionality End-to-end argument Multiplexing Reliability At least once At most once In-order Integrity Efficient use of medium Don t send faster than receiver can handle Don t send faster than the network can handle
10 Network Layer Service Best effort, packets may: Not arrive Arrive out of order Arrive corrupted Take too long
11 Multiplexing Several applications on a single node want to use the same network endpoint Possible solution: have application identifiers Well known names? Program name? There may be multiple instances of the same application Another solution: ports Opaque ids to the transport layer Chosen by the applications/os Well-known ports make it easy to find services
12 Reliability: At least once How to guarantee that a packet reaches the destination at least once? Acknowledgments and timeouts Semantics: If it is possible to get through, the packet will Otherwise the application will know Problems? Duplicate packets. Why do they arise? Differentiating failures: forward or reverse path?
13 Challenge: How to Choose Timeouts? What are the effects of wrong timeouts? What are the sources of delay? Fixed timers are bad Adaptive timers EWMA: running estimate of the average EstRTT = (1 α) EstRTT + α SampleRTT Use 2x EstRTT TCP does something more Also estimate Standard Error, and uses EstRTT + 4x EstErr
14 At most once semantics Acks and timeouts work, but create duplicates How do we eliminate these duplicates? Keep state at the receiver List of received packet ids How long should this list be? For how long should we keep it? What if the sender uses incremental ids? Receiver can forget about packets that are far enough in the past (more about this later) Can this always work?
15 Reliability Question: did we really achieve exactly once semantics? If the data arrives, it will arrive exactly once If not, the sender will learn of this by a lack of acknowledgment But it can t be fundamentally perfect, people choose limits that work well in practice
16 Integrity* Question: did you get the same data that was sent? Must have a way to check: Make not all messages valid Discard the messages that are invalid How to do that? Checksums are a simple way Are they perfect? Can you have false positives? False negatives? * Not the cryptographic no0on of integrity, although you can layer it on top
17 In-order delivery Why can packets arrive out of order? How to ensure that data is delivered in order to the application? Receiver should keep a buffer, and only deliver a packet once all the others before it. How can we limit the size? What if we miss the first packet? Solution: have a window of valid packets Receiver doesn t ack until all preceding packets have been received. Sender only sends packet i+w after i s acknowledgment
18 Efficiency We want to utilize the network resources as much as possible but not more!
19 Sliding Window See drawing What is the data rate achieved? data rate = window size / round trip time What is the best you can do? fill the pipe : window size = round trip x bottleneck rate A sliding window is self-paced Acknowledgment allows sender to send new packet Determines buffer size at sender and receiver Controls the rate
20 Efficiency 3 goals: Utilize the network Don t overwhelm the receiver: flow control Don t overwhelm the network: congestion control
The Transmission Control Protocol (TCP)
The Transmission Control Protocol (TCP) Application Services (Telnet, FTP, e-mail, WWW) Reliable Stream Transport (TCP) Unreliable Transport Service (UDP) Connectionless Packet Delivery Service (IP) Goals
More informationCSCI-1680 Transport Layer I Rodrigo Fonseca
CSCI-1680 Transport Layer I Rodrigo Fonseca Based partly on lecture notes by David Mazières, Phil Levis, John Jannotti Today Transport Layer UDP TCP Intro Connection Establishment From Lec 2: OSI Reference
More informationCSCI-1680 Transport Layer I Rodrigo Fonseca
CSCI-1680 Transport Layer I Rodrigo Fonseca Based partly on lecture notes by David Mazières, Phil Levis, John Janno< Today Transport Layer UDP TCP Intro Connection Establishment Transport Layer "#$ -##$
More informationECE697AA Lecture 3. Today s lecture
ECE697AA Lecture 3 Transport Layer: TCP and UDP Tilman Wolf Department of Electrical and Computer Engineering 09/09/08 Today s lecture Transport layer User datagram protocol (UDP) Reliable data transfer
More informationTransport Layer Marcos Vieira
Transport Layer 2014 Marcos Vieira Transport Layer Transport protocols sit on top of network layer and provide Application-level multiplexing ( ports ) Error detection, reliability, etc. UDP User Datagram
More informationChapter 23 Process-to-Process Delivery: UDP, TCP, and SCTP 23.1
Chapter 23 Process-to-Process Delivery: UDP, TCP, and SCTP 23.1 Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display. 23-1 PROCESS-TO-PROCESS DELIVERY 23.2 The transport
More informationBasic Reliable Transport Protocols
Basic Reliable Transport Protocols Do not be alarmed by the length of this guide. There are a lot of pictures. You ve seen in lecture that most of the networks we re dealing with are best-effort : they
More informationAnnouncements. No book chapter for this topic! Slides are posted online as usual Homework: Will be posted online Due 12/6
Announcements No book chapter for this topic! Slides are posted online as usual Homework: Will be posted online Due 12/6 Copyright c 2002 2017 UMaine Computer Science Department 1 / 33 1 COS 140: Foundations
More informationUNIT IV -- TRANSPORT LAYER
UNIT IV -- TRANSPORT LAYER TABLE OF CONTENTS 4.1. Transport layer. 02 4.2. Reliable delivery service. 03 4.3. Congestion control. 05 4.4. Connection establishment.. 07 4.5. Flow control 09 4.6. Transmission
More informationTransport Layer. Gursharan Singh Tatla. Upendra Sharma. 1
Transport Layer Gursharan Singh Tatla mailme@gursharansingh.in Upendra Sharma 1 Introduction The transport layer is the fourth layer from the bottom in the OSI reference model. It is responsible for message
More informationChapter 6. What happens at the Transport Layer? Services provided Transport protocols UDP TCP Flow control Congestion control
Chapter 6 What happens at the Transport Layer? Services provided Transport protocols UDP TCP Flow control Congestion control OSI Model Hybrid Model Software outside the operating system Software inside
More informationReliable Transport I: Concepts and TCP Protocol
Reliable Transport I: Concepts and TCP Protocol Stefano Vissicchio UCL Computer Science COMP0023 Today Transport Concepts Layering context Transport goals Transport mechanisms and design choices TCP Protocol
More informationNo book chapter for this topic! Slides are posted online as usual Homework: Will be posted online Due 12/6
Announcements No book chapter for this topic! Slides are posted online as usual Homework: Will be posted online Due 12/6 Copyright c 2002 2017 UMaine School of Computing and Information S 1 / 33 COS 140:
More informationReliable Transport I: Concepts and TCP Protocol
Reliable Transport I: Concepts and TCP Protocol Brad Karp UCL Computer Science CS 3035/GZ01 29 th October 2013 Part I: Transport Concepts Layering context Transport goals Transport mechanisms 2 Context:
More informationCSCI Computer Networks
CSCI-1680 - Computer Networks Chen Avin (avin) Based partly on lecture notes by David Mazières, Phil Levis, John Jannotti, Peterson & Davie, Rodrigo Fonseca Administrivia Sign and hand in Collaboration
More informationNetwork Protocols. Sarah Diesburg Operating Systems CS 3430
Network Protocols Sarah Diesburg Operating Systems CS 3430 Protocol An agreement between two parties as to how information is to be transmitted A network protocol abstracts packets into messages Physical
More informationComputer Networks. Homework #4: No Grading
Computer Networks Homework #4: No Grading Problem #1. Assume you need to write and test a client-server application program on two hosts you have at home. a. What is the range of port numbers you would
More informationTSIN02 - Internetworking
TSIN02 - Internetworking Literature: Lecture 4: Transport Layer Forouzan: ch 11-12 Transport layer responsibilities UDP TCP 2004 Image Coding Group, Linköpings Universitet 2 Transport layer in OSI model
More informationCommunication Networks
Communication Networks Prof. Laurent Vanbever Exercises week 4 Reliable Transport Reliable versus Unreliable Transport In the lecture, you have learned how a reliable transport protocol can be built on
More informationProgramming Assignment 3: Transmission Control Protocol
CS 640 Introduction to Computer Networks Spring 2005 http://www.cs.wisc.edu/ suman/courses/640/s05 Programming Assignment 3: Transmission Control Protocol Assigned: March 28,2005 Due: April 15, 2005, 11:59pm
More informationCSE 461 Module 10. Introduction to the Transport Layer
CSE 461 Module 10 Introduction to the Transport Layer Last Time We finished up the Network layer Internetworks (IP) Routing (DV/RIP, LS/OSPF, BGP) It was all about routing: how to provide end-to-end delivery
More informationCS419: Computer Networks. Lecture 10, Part 3: Apr 13, 2005 Transport: TCP performance
: Computer Networks Lecture 10, Part 3: Apr 13, 2005 Transport: TCP performance TCP performance We ve seen how TCP the protocol works But there are a lot of tricks required to make it work well Indeed,
More informationReliable Byte-Stream (TCP)
Reliable Byte-Stream () Outline Connection Establishment/Termination Sliding Window Revisited Flow Control Adaptive Timeout Simple Demultiplexer (UDP) Header format Note 16 bit port number (so only 64K
More informationTransport Layer Protocols TCP
Transport Layer Protocols TCP Gail Hopkins Introduction Features of TCP Packet loss and retransmission Adaptive retransmission Flow control Three way handshake Congestion control 1 Common Networking Issues
More informationCS 640 Introduction to Computer Networks Spring 2009
CS 640 Introduction to Computer Networks Spring 2009 http://pages.cs.wisc.edu/~suman/courses/wiki/doku.php?id=640-spring2009 Programming Assignment 3: Transmission Control Protocol Assigned: March 26,
More informationCSCD 330 Network Programming
CSCD 330 Network Programming Lecture 10 Transport Layer Continued Spring 2018 Reading: Chapter 3 Some Material in these slides from J.F Kurose and K.W. Ross All material copyright 1996-2007 1 Last Time.
More informationCS4700/CS5700 Fundamentals of Computer Networks
CS4700/CS5700 Fundamentals of Computer Networks Lecture 14: TCP Slides used with permissions from Edward W. Knightly, T. S. Eugene Ng, Ion Stoica, Hui Zhang Alan Mislove amislove at ccs.neu.edu Northeastern
More informationNWEN 243. Networked Applications. Layer 4 TCP and UDP
NWEN 243 Networked Applications Layer 4 TCP and UDP 1 About the second lecturer Aaron Chen Office: AM405 Phone: 463 5114 Email: aaron.chen@ecs.vuw.ac.nz Transport layer and application layer protocols
More informationSolution to Question 1: ``Quickies'' (25 points, 15 minutes)
Solution to Question : ``Quickies'' (25 points, 5 minutes) What is meant by the term statistical multiplexing? Answer: In statistical multiplexing, data from multiple users (senders) is sent over a link.
More informationCOMP/ELEC 429/556 Introduction to Computer Networks
COMP/ELEC 429/556 Introduction to Computer Networks The TCP Protocol Some slides used with permissions from Edward W. Knightly, T. S. Eugene Ng, Ion Stoica, Hui Zhang T. S. Eugene Ng eugeneng at cs.rice.edu
More informationCS457 Transport Protocols. CS 457 Fall 2014
CS457 Transport Protocols CS 457 Fall 2014 Topics Principles underlying transport-layer services Demultiplexing Detecting corruption Reliable delivery Flow control Transport-layer protocols User Datagram
More informationPage 1. Goals for Today" Discussion" Example: Reliable File Transfer" CS162 Operating Systems and Systems Programming Lecture 11
Goals for Today" CS162 Operating Systems and Systems Programming Lecture 11 Reliability, Transport Protocols" Finish e2e argument & fate sharing Transport: TCP/UDP Reliability Flow control October 5, 2011
More informationPage 1. Goals for Today" Placing Network Functionality" Basic Observation" CS162 Operating Systems and Systems Programming Lecture 15
Goals for Today" CS162 Operating Systems and Systems Programming Lecture 15 Finish e2e argument & fate sharing! Transport: TCP/UDP! Reliability! Flow control! Reliability, Transport Protocols" March 16,
More informationCMPE 80N: Introduction to Networking and the Internet
CMPE 80N: Introduction to Networking and the Internet Katia Obraczka Computer Engineering UCSC Baskin Engineering Lecture 11 CMPE 80N Fall'10 1 Announcements Forum #2 due on 11.05. CMPE 80N Fall'10 2 Last
More informationTSIN02 - Internetworking
Lecture 4: Transport Layer Literature: Forouzan: ch 11-12 2004 Image Coding Group, Linköpings Universitet Lecture 4: Outline Transport layer responsibilities UDP TCP 2 Transport layer in OSI model Figure
More informationMobile Transport Layer Lesson 02 TCP Data Stream and Data Delivery
Mobile Transport Layer Lesson 02 TCP Data Stream and Data Delivery 1 TCP Data Stream Consists of bytes Delivered using a virtual connection between sockets Each socket has the port number and IP address
More informationChapter 3: Transport Layer Part A
Chapter 3: Transport Layer Part A Course on Computer Communication and Networks, CTH/GU The slides are adaptation of the slides made available by the authors of the course s main textbook 3: Transport
More information32 bits. source port # dest port # sequence number acknowledgement number not used. checksum. Options (variable length)
Chapter 3 outline 3.1 Transport-layer services 3.2 Multiplexing and demultiplexing 3.3 Connectionless transport: UDP 3.4 Principles of reliable data transfer 3.5 Connectionoriented transport: TCP segment
More informationIntroduction to Protocols
Chapter 6 Introduction to Protocols 1 Chapter 6 Introduction to Protocols What is a Network Protocol? A protocol is a set of rules that governs the communications between computers on a network. These
More informationApplied Networks & Security
Applied Networks & Security TCP/IP Protocol Suite http://condor.depaul.edu/~jkristof/it263/ John Kristoff jtk@depaul.edu IT 263 Spring 2006/2007 John Kristoff - DePaul University 1 ARP overview datalink
More informationDoes current Internet Transport work over Wireless? Reviewing the status of IETF work in this area
Does current Internet Transport work over Wireless? Reviewing the status of IETF work in this area Sally Floyd March 2, 2000 IAB Workshop on Wireless Internetworking 1 Observations: Transport protocols
More informationLecture 3: The Transport Layer: UDP and TCP
Lecture 3: The Transport Layer: UDP and TCP Prof. Shervin Shirmohammadi SITE, University of Ottawa Prof. Shervin Shirmohammadi CEG 4395 3-1 The Transport Layer Provides efficient and robust end-to-end
More informationCommunication Networks
Communication Networks Spring 2018 Laurent Vanbever nsg.ee.ethz.ch ETH Zürich (D-ITET) April 30 2018 Materials inspired from Scott Shenker & Jennifer Rexford Last week on Communication Networks We started
More informationCSCI-1680 Link Layer I Rodrigo Fonseca
CSCI-1680 Link Layer I Rodrigo Fonseca Based partly on lecture notes by David Mazières, Phil Levis, John Jannotti Last time Physical layer: encoding, modulation Today Link layer framing Getting frames
More information4.0.1 CHAPTER INTRODUCTION
4.0.1 CHAPTER INTRODUCTION Data networks and the Internet support the human network by supplying seamless, reliable communication between people - both locally and around the globe. On a single device,
More informationCSCD 330 Network Programming
CSCD 330 Network Programming Lecture 9 Transport Layer Spring 2018 Reading: Begin Chapter 3 Some Material in these slides from J.F Kurose and K.W. Ross All material copyright 1996-2007 1 Outline Overview
More informationLecture 20 Overview. Last Lecture. This Lecture. Next Lecture. Transport Control Protocol (1) Transport Control Protocol (2) Source: chapters 23, 24
Lecture 20 Overview Last Lecture Transport Control Protocol (1) This Lecture Transport Control Protocol (2) Source: chapters 23, 24 Next Lecture Internet Applications Source: chapter 26 COSC244 & TELE202
More informationc. If the sum contains a zero, the receiver knows there has been an error.
ENSC-37 Fall 27 Assignment#3 Due Date 6 Oct. 27 Problem-:[4] UDP and TCP use s complement for their checksums. Suppose you have the following three 8-bit bytes:,, and. a. [6] What is the s complement of
More informationEE 122: IP Forwarding and Transport Protocols
EE 1: IP Forwarding and Transport Protocols Ion Stoica (and Brighten Godfrey) TAs: Lucian Popa, David Zats and Ganesh Ananthanarayanan http://inst.eecs.berkeley.edu/~ee1/ (Materials with thanks to Vern
More informationCS 716: Introduction to communication networks th class; 7 th Oct Instructor: Sridhar Iyer IIT Bombay
CS 716: Introduction to communication networks - 18 th class; 7 th Oct 2011 Instructor: Sridhar Iyer IIT Bombay Reliable Transport We have already designed a reliable communication protocol for an analogy
More informationCS 5520/ECE 5590NA: Network Architecture I Spring Lecture 13: UDP and TCP
CS 5520/ECE 5590NA: Network Architecture I Spring 2008 Lecture 13: UDP and TCP Most recent lectures discussed mechanisms to make better use of the IP address space, Internet control messages, and layering
More informationComputer Networks. Sándor Laki ELTE-Ericsson Communication Networks Laboratory
Computer Networks Sándor Laki ELTE-Ericsson Communication Networks Laboratory ELTE FI Department Of Information Systems lakis@elte.hu http://lakis.web.elte.hu Based on the slides of Laurent Vanbever. Further
More informationCS 4390 Computer Networks. Transport Services and Protocols
CS 4390 Computer Networks UT D data Session 07 Transport Layer Overview and UDP Adapted from Computer Networking a Top-Down Approach 1996-2012 by J.F Kurose and K.W. Ross, All Rights Reserved Transport
More informationOSI Transport Layer. Network Fundamentals Chapter 4. Version Cisco Systems, Inc. All rights reserved. Cisco Public 1
OSI Transport Layer Network Fundamentals Chapter 4 Version 4.0 1 Transport Layer Role and Services Transport layer is responsible for overall end-to-end transfer of application data 2 Transport Layer Role
More informationECE 333: Introduction to Communication Networks Fall 2001
ECE 333: Introduction to Communication Networks Fall 2001 Lecture 28: Transport Layer III Congestion control (TCP) 1 In the last lecture we introduced the topics of flow control and congestion control.
More informationCS321: Computer Networks Error and Flow Control in TCP
CS321: Computer Networks Error and Flow Control in TCP Dr. Manas Khatua Assistant Professor Dept. of CSE IIT Jodhpur E-mail: manaskhatua@iitj.ac.in SEQ and ACK numbers in TCP TCP views data as an unstructured,
More informationChapter 24. Transport-Layer Protocols
Chapter 24. Transport-Layer Protocols 23.1 Introduction 23.2 User Datagram Protocol 23.3 Transmission Control Protocol 23.4 SCTP Computer Networks 24-1 Position of Transport-Layer Protocols UDP is an unreliable
More informationTSIN02 - Internetworking
Lecture 4: Transport Layer Literature: Forouzan: ch 11-12 2004 Image Coding Group, Linköpings Universitet Lecture 4: Outline Transport layer responsibilities UDP TCP 2 Transport layer in OSI model Figure
More informationCCNA Exploration Network Fundamentals. Chapter 04 OSI Transport Layer
CCNA Exploration Network Fundamentals Chapter 04 OSI Transport Layer Updated: 05/05/2008 1 4.1 Roles of the Transport Layer 2 4.1 Roles of the Transport Layer The OSI Transport layer accept data from the
More informationCS 138: Communication I. CS 138 V 1 Copyright 2012 Thomas W. Doeppner. All rights reserved.
CS 138: Communication I CS 138 V 1 Copyright 2012 Thomas W. Doeppner. All rights reserved. Topics Network Metrics Layering Reliability Congestion Control Routing CS 138 V 2 Copyright 2012 Thomas W. Doeppner.
More informationTSIN02 - Internetworking
Lecture 4: Outline Literature: Lecture 4: Transport Layer Forouzan: ch 11-12 RFC? Transport layer introduction UDP TCP 2004 Image Coding Group, Linköpings Universitet 2 The Transport Layer Transport layer
More informationTransport Protocols Reading: Sections 2.5, 5.1, and 5.2
Transport Protocols Reading: Sections 2.5, 5.1, and 5.2 COS 461: Computer Networks Spring 2006 (MW 1:30-2:50 in Friend 109) Jennifer Rexford Teaching Assistant: Mike Wawrzoniak http://www.cs.princeton.edu/courses/archive/spring06/cos461/
More informationNetworking Technologies and Applications
Networking Technologies and Applications Rolland Vida BME TMIT Transport Protocols UDP User Datagram Protocol TCP Transport Control Protocol and many others UDP One of the core transport protocols Used
More informationQuestion. Reliable Transport: The Prequel. Don t parse my words too carefully. Don t be intimidated. Decisions and Their Principles.
Question How many people have not yet participated? Reliable Transport: The Prequel EE122 Fall 2012 Scott Shenker http://inst.eecs.berkeley.edu/~ee122/ Materials with thanks to Jennifer Rexford, Ion Stoica,
More informationChapter 5 End-to-End Protocols
Chapter 5 End-to-End Protocols Transport layer turns the host-to-host packet delivery service of the underlying network into a process-to-process communication channel Common properties that application
More informationSequence Number. Acknowledgment Number. Data
CS 455 TCP, Page 1 Transport Layer, Part II Transmission Control Protocol These slides are created by Dr. Yih Huang of George Mason University. Students registered in Dr. Huang's courses at GMU can make
More informationProblem. Chapter Outline. Chapter Goal. End-to-end Protocols. End-to-end Protocols. Chapter 5. End-to-End Protocols
Computer Networks: A Systems Approach, 5e Larry L. Peterson and Bruce S. Davie End-to-End Protocols Problem How to turn this host-to-host packet delivery service into a process-to-process communication
More informationDifferent Layers Lecture 20
Different Layers Lecture 20 10/15/2003 Jian Ren 1 The Network Layer 10/15/2003 Jian Ren 2 Network Layer Functions Transport packet from sending to receiving hosts Network layer protocols in every host,
More informationTransport Protocols Reading: Sections 2.5, 5.1, and 5.2. Goals for Todayʼs Lecture. Role of Transport Layer
Transport Protocols Reading: Sections 2.5, 5.1, and 5.2 CS 375: Computer Networks Thomas C. Bressoud 1 Goals for Todayʼs Lecture Principles underlying transport-layer services (De)multiplexing Detecting
More informationIntroduction to Networks and the Internet
Introduction to Networks and the Internet CMPE 80N Announcements Project 2. Reference page. Library presentation. Internet History video. Spring 2003 Week 7 1 2 Today Internetworking (cont d). Fragmentation.
More informationTransport Protocols Reading: Sections 2.5, 5.1, and 5.2
Transport Protocols Reading: Sections 2.5, 5.1, and 5.2 CE443 - Fall 1390 Acknowledgments: Lecture slides are from Computer networks course thought by Jennifer Rexford at Princeton University. When slides
More informationCOMP 431 Internet Services & Protocols. Transport Layer Protocols & Services Outline. The Transport Layer Reliable data delivery & flow control in TCP
COMP 431 Internet Services & Protocols Transport Layer Protocols & Services Outline The Transport Layer Reliable data delivery & flow control in TCP Jasleen Kaur Fundamental transport layer services» Multiplexing/Demultiplexing»
More informationDatagram Congestion Control Protocol (DCCP)
Datagram Congestion Control Protocol (DCCP) Chung, Kwangsue kchung@kw.ac.kr June, 2003 1 Contents Introduction & Motivation DCCP Mechanisms Current Issues & Implementations 2 DCCP: Introduction & Motivation
More informationUser Datagram Protocol
Topics Transport Layer TCP s three-way handshake TCP s connection termination sequence TCP s TIME_WAIT state TCP and UDP buffering by the socket layer 2 Introduction UDP is a simple, unreliable datagram
More informationUnit 2.
Unit 2 Unit 2 Topics Covered: 1. PROCESS-TO-PROCESS DELIVERY 1. Client-Server 2. Addressing 2. IANA Ranges 3. Socket Addresses 4. Multiplexing and Demultiplexing 5. Connectionless Versus Connection-Oriented
More informationDevelopment of reliable protocol Sliding window protocols. C = channel capacity in bps I = interrupt/service time + propagation delay
Outline Development of reliable protocol Sliding window protocols Go-Back-N, Selective Repeat Protocol performance Sockets, UDP, TCP, and IP UDP operation TCP operation connection management flow control
More informationTransport Layer. Application / Transport Interface. Transport Layer Services. Transport Layer Connections
Application / Transport Interface Application requests service from transport layer Transport Layer Application Layer Prepare Transport service requirements Data for transport Local endpoint node address
More informationTransport Layer: outline
Transport Layer: outline Transport-layer services Multiplexing and demultiplexing Connectionless transport: UDP Principles of reliable data transfer Connection-oriented transport: TCP Segment structure
More informationThe Transport Layer Multiplexing, Error Detection, & UDP
CPSC 852 Internetworking The Transport Layer Multiplexing, Error Detection, & UDP Michele Weigle Department of Computer Science Clemson University mweigle@cs.clemson.edu http://www.cs.clemson.edu/~mweigle/courses/cpsc852
More informationCSC 4900 Computer Networks: TCP
CSC 4900 Computer Networks: TCP Professor Henry Carter Fall 2017 Project 2: mymusic You will be building an application that allows you to synchronize your music across machines. The details of which are
More informationUDP, TCP, IP multicast
UDP, TCP, IP multicast Dan Williams In this lecture UDP (user datagram protocol) Unreliable, packet-based TCP (transmission control protocol) Reliable, connection oriented, stream-based IP multicast Process-to-Process
More informationLecture 08: The Transport Layer (Part 2) The Transport Layer Protocol (TCP) Dr. Anis Koubaa
NET 331 Computer Networks Lecture 08: The Transport Layer (Part 2) The Transport Layer Protocol (TCP) Dr. Anis Koubaa Reformatted slides from textbook Computer Networking a top-down appraoch, Fifth Edition
More informationCMPE150 Midterm Solutions
CMPE150 Midterm Solutions Question 1 Packet switching and circuit switching: (a) Is the Internet a packet switching or circuit switching network? Justify your answer. The Internet is a packet switching
More information05 Transmission Control Protocol (TCP)
SE 4C03 Winter 2003 05 Transmission Control Protocol (TCP) Instructor: W. M. Farmer Revised: 06 February 2003 1 Interprocess Communication Problem: How can a process on one host access a service provided
More informationCPSC 441 COMPUTER COMMUNICATIONS MIDTERM EXAM SOLUTION
CPSC 441 COMPUTER COMMUNICATIONS MIDTERM EXAM SOLUTION Department of Computer Science University of Calgary Professor: Carey Williamson March 8, 2013 This is a CLOSED BOOK exam. Textbooks, notes, laptops,
More informationLecture 5: Flow Control. CSE 123: Computer Networks Alex C. Snoeren
Lecture 5: Flow Control CSE 123: Computer Networks Alex C. Snoeren Pipelined Transmission Sender Receiver Sender Receiver Ignored! Keep multiple packets in flight Allows sender to make efficient use of
More informationComputer Networks and Data Systems
Computer Networks and Data Systems Transport Layer TDC463 Winter 2011/12 John Kristoff - DePaul University 1 Why a transport layer? IP gives us end-to-end connectivity doesn't it? Why, or why not, more
More informationLecture 2: Layering & End-to-End
Lecture 2: Layering & End-to-End CSE 222A: Computer Communication Networks Alex C. Snoeren Thanks: Mike Freedman & Amin Vahdat Lecture 2 Overview Layering Application interface Transport services Discussion
More informationData Transport over IP Networks
Data Transport over IP Networks Derek Konigsberg octo@logicprobe.org AITP University of Central Florida Data Transport over IP Networks p.1/24 Introduction The TCP/IP protocol suite was created by DARPA
More informationCSE 4213: Computer Networks II
Next CSE 4213: Computer Networks II The layer Suprakash Datta datta@cs.yorku.ca Office: CSEB 3043 Phone: 416-736-2100 ext 77875 Course page: http://www.cs.yorku.ca/course/4213 These slides are adapted
More informationSuprakash Datta. Office: CSEB 3043 Phone: ext Course page:
CSE 3214: Computer Networks Protocols and Applications Suprakash Datta datta@cse.yorku.ca Office: CSEB 3043 Phone: 416-736-2100 ext 77875 Course page: http://www.cse.yorku.ca/course/3214 These slides are
More informationCSCD 330 Network Programming
CSCD 330 Network Programming Lecture 9 Transport Layer Winter 2019 Reading: Begin Chapter 3 Some Material in these slides from J.F Kurose and K.W. Ross All material copyright 1996-2007 1 Outline Overview
More informationUNIT IV TRANSPORT LAYER
Transport Layer UNIT IV TRANSPORT LAYER Congestion Control and Quality of Service Ref: Data Communication & Networking, 4 th edition, Forouzan IV-1 DATA TRAFFIC The main focus of congestion control and
More informationInternetworking Models The OSI Reference Model
Internetworking Models When networks first came into being, computers could typically communicate only with computers from the same manufacturer. In the late 1970s, the Open Systems Interconnection (OSI)
More informationCRC. Implementation. Error control. Software schemes. Packet errors. Types of packet errors
CRC Implementation Error control An Engineering Approach to Computer Networking Detects all single bit errors almost all 2-bit errors any odd number of errors all bursts up to M, where generator length
More informationThe Transport Layer Reliability
The Transport Layer Reliability CS 3, Lecture 7 http://www.cs.rutgers.edu/~sn4/3-s9 Srinivas Narayana (slides heavily adapted from text authors material) Quick recap: Transport Provide logical communication
More informationCSE 461. TCP and network congestion
CSE 461 TCP and network congestion This Lecture Focus How should senders pace themselves to avoid stressing the network? Topics Application Presentation Session Transport Network congestion collapse Data
More informationECE 333: Introduction to Communication Networks Fall 2002
ECE 333: Introduction to Communication Networks Fall 2002 Lecture 26: Transport layer I 1 Transport Layer In the remaining lectures, we will discuss several issues that are commonly addressed at the transport
More informationDepartment of Computer and IT Engineering University of Kurdistan. Transport Layer. By: Dr. Alireza Abdollahpouri
Department of Computer and IT Engineering University of Kurdistan Transport Layer By: Dr. Alireza Abdollahpouri TCP/IP protocol suite 2 Transport Layer The transport layer is responsible for process-to-process
More informationCS519: Computer Networks. Lecture 5, Part 1: Mar 3, 2004 Transport: UDP/TCP demux and flow control / sequencing
: Computer Networks Lecture 5, Part 1: Mar 3, 2004 Transport: UDP/TCP demux and flow control / sequencing Recall our protocol layers... ... and our protocol graph IP gets the packet to the host Really
More information