'Selective repeat' presentation slideshows

Modeling using queuing theory

Modeling using queuing theory. if N.R=M then input capacity = capacity of multiplexed link => TDM if N.R>M but ? .N.R<M then this may be modeled by a queuing system to analyze its performance. Queuing system for single server. Inputs/Outputs of Queuing Theory. Given: arrival rate

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End to End Protocols

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Wireless & Mobile Networking CS 752/852 - Spring 2011

Wireless & Mobile Networking CS 752/852 - Spring 2011. Wireless TCP. Tamer Nadeem Dept. of Computer Science. The OSI Communication Model. Recall 1: PHY and MAC. MAC. MAC. PHY. PHY. Spread Spectrum radios (DS and FH) RTS/CTS and Carrier Sensing for Hidden Terminals

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Transport Layer: Part II

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The Data Link Layer

The Data Link Layer. Chapter 3. Data Link Layer Design Issues. Services Provided to the Network Layer Framing Error Control Flow Control. Functions of the Data Link Layer. Provide service interface to the network layer Dealing with transmission errors Regulating data flow

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EEC-484/584 Computer Networks

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Ch 11. Data Link Control

Ch 11. Data Link Control. Data Link Layer. Functionalities of data link layer Data link control (chapter 11): about node-to-node communication Media access control (chapter 12): about link sharing Data link control Framing (the bits organization) Flow and error control. 11.1 Framing.

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TCP: Overview RFCs: 793, 1122, 1323, 2018, 2581

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EEC-484/584 Computer Networks

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cs / ee 143 Communication Networks Chapter 7 Transport

cs / ee 143 Communication Networks Chapter 7 Transport. Text: Walrand & Parakh , 2010 Steven Low CMS, EE, Caltech. Transport services. UDP Datagram service No congestion control No error/loss recovery Lightweight. TCP Connection oriented service Congestion control

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CMPE 150 Fall 2005 Lecture 13

CMPE 150 Fall 2005 Lecture 13. Introduction to Computer Networks . Announcements. Midterm postponed! Instead of 10.28, it will be on 11.04 ! Lab next week: Discussion sessions on protocol pseudo-code (from Tanenbaum Chapter 3). Also, checksum calculation practice!

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Homework

Homework. Chapter 2#10,13-18 Due Wed September 17. 3.1 Transport-layer services 3.2 Multiplexing and demultiplexing 3.3 Connectionless transport: UDP 3.4 Principles of reliable data transfer. 3.5 Connection-oriented transport: TCP segment structure reliable data transfer flow control

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Pipelined protocols

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CS3502: Data and Computer Networks DATA LINK LAYER - 2 WB version

CS3502: Data and Computer Networks DATA LINK LAYER - 2 WB version. data link layer : flow and error control. purpose : regulate the flow of data from sender S to receiver R , so that R is neither overwhelmed nor kept idle unnecessarily.

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rdt2.1: sender, handles garbled ACK/NAKs

Wait for ACK or NAK 0. Wait for call 1 from above. Wait for ACK or NAK 1. rdt2.1: sender, handles garbled ACK/NAKs. rdt_send(data). sndpkt = make_pkt(0, data, checksum) udt_send(sndpkt). rdt_rcv(rcvpkt) && ( corrupt(rcvpkt) || isNAK(rcvpkt) ). Wait for call 0 from above.

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Transport Layer Lecture 8 Imran Ahmed University of Management & Technology

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rdt2.2: a NAK-free protocol

same functionality as rdt2.1, using ACKs only instead of NAK, receiver sends ACK for last pkt received OK receiver must explicitly include seq # of pkt being ACKed duplicate ACK at sender results in same action as NAK: retransmit current pkt. rdt2.2: a NAK-free protocol.

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Transport Layer Lecture 10 Imran Ahmed University of Management & Technology

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Fundamentals of Computer Networks ECE 478/578

Fundamentals of Computer Networks ECE 478/578. Lecture #7: Reliable Transmission Instructor: Loukas Lazos Dept of Electrical and Computer Engineering University of Arizona. Reliable Transmission. Transmission strategies under a lossless channel Simplex connection Simplex Stop-and-wait

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CS244A Midterm Review

CS244A Midterm Review. Ben Nham. Some slides derived from: David Erickson (2007) Paul Tarjan (2007). Midterm Information. In class on Tuesday E-mail staff if you need information on taking it offsite (SCPD) One side of notes on letter-sized paper Calculator

209 views • 11 slides