Switching and Forwarding
|
|
- Dorothy McBride
- 6 years ago
- Views:
Transcription
1 Switching and Forwarding Outline Store-and-Forward Switches Bridges and Extended LANs Spring 7 CSE64 Switch Switching protocol T T STS- Spring 7 CSE64
2 Scalable Networks Switch forwards packets from input port to output port port selected based on address in packet header T T STS- Input ports Switch T T STS- Output ports Advantages cover large geographic area (tolerate latency) support large numbers of hosts (scalable bandwidth) Spring 7 CSE64 Source Routing Switch Switch Host A Switch Host B Spring 7 CSE64 4
3 Source Routing Header entering switch D C B A D C B A Ptr D C B A Header leaving switch A D C B D C B Ptr D C B A (a) (b) (c) Spring 7 CSE64 5 Virtual Circuit Switching Explicit connection setup (and tear-down) phase Subsequence packets follow same circuit Sometimes called connection-oriented model Analogy: phone call Each switch maintains a VC table Host A Switch 5 Switch 7 Switch 4 Host B Spring 7 CSE64 6
4 Datagram Switching No connection setup phase Each packet forwarded independently Sometimes called connectionless model Analogy: postal system Each switch maintains a forwarding (routing) table Host D Switch Host C Host A Host E Switch Host G Switch Host F Host B Host H Spring 7 CSE64 7 Example Tables Circuit Table (switch, port ) VC In VC Out Port Out Forwarding Table (switch ) Address Port A C F G Spring 7 CSE64 8 4
5 Virtual Circuit Model Typically wait full RTT for connection setup before sending first data packet. While the connection request contains the full address for destination, each data packet contains only a small identifier, making the per-packet header overhead small. If a switch or a link in a connection fails, the connection is broken and a new one needs to be established. Connection setup provides an opportunity to reserve resources. Spring 7 CSE64 9 Datagram Model There is no round trip delay waiting for connection setup; a host can send data as soon as it is ready. Source host has no way of knowing if the network is capable of delivering a packet or if the destination host is even up. Since packets are treated independently, it is possible to route around link and node failures. Since every packet must carry the full address of the destination, the overhead per packet is higher than for the connection-oriented model. Spring 7 CSE64 5
6 Bridges and Extended LANs LANs have physical limitations (e.g., 5m) Connect two or more LANs with a bridge accept and forward strategy level connection (does not add packet header) A B C Port Bridge Port X Y Z Ethernet Switch = Bridge on Steroids Spring 7 CSE64 Learning Bridges Do not forward when unnecessary Maintain forwarding table A B C Bridge Port Port X Y Z Host Port A B C X Y Z Learn table entries based on source address Table is an optimization; need not be complete Always forward broadcast frames Spring 7 CSE64 6
7 Spanning Tree Algorithm Problem: loops A B B C B5 B D B7 K E F B G H B6 B4 I J Bridges run a distributed spanning tree algorithm select which bridges actively forward developed by Radia Perlman now IEEE 8. specification (a) (b) Spring 7 CSE64 Algorithm Overview Each bridge has unique id (e.g., B, B, B) Select bridge with smallest id as root Select bridge on each LAN closest to root as designated bridge (use id to break ties) A Each bridge forwards frames over each LAN for which it B C is the designated bridge B D B5 B7 B K E F B G H B6 B4 I J Spring 7 CSE64 4 7
8 Algorithm Details Bridges exchange configuration messages id for bridge sending the message id for what the sending bridge believes to be root bridge distance (hops) from sending bridge to root bridge Each bridge records current best configuration message for each port Initially, each bridge believes it is the root Spring 7 CSE64 5 Algorithm Detail (cont) When learn not root, stop generating config messages in steady state, only root generates configuration messages When learn not designated bridge, stop forwarding config messages in steady state, only designated bridges forward config messages Root continues to periodically send config messages If any bridge does not receive config message after a period of time, it starts generating config messages claiming to be the root Spring 7 CSE64 6 8
9 Configuration A B B C B5 B D B7 K E F B G H I B6 B4 J Spring 7 CSE64 7 Broadcast and Multicast Forward all broadcast/multicast frames current practice Learn when no group members downstream Accomplished by having each member of group G send a frame to bridge multicast address with G in source field Spring 7 CSE64 8 9
10 Limitations of Bridges Do not scale spanning tree algorithm does not scale broadcast does not scale Do not accommodate heterogeneity Caution: beware of transparency Spring 7 CSE64 9
Switching and Forwarding - continued
Fall 9/ CptS/EE 555 Fall 9/ CptS/EE 555 4 Housekeeping Look at select system call See homework solutions on the Lecture Notes web page for answer to the probability difficulties we (I) had last time No
More informationSwitching and Forwarding - continued
Fall 9/7 CptS/EE 555 Fall 9/7 CptS/EE 555 4 Housekeeping Look at select system call See homework solutions on the Lecture Notes web page for answer to the probability difficulties we (I) had last time
More informationSwitching and Forwarding
Switching and Forwarding Outline Store-and-Forward Switches ridges and Extended LNs ell Switching Segmentation and Reassembly Scalable Networks Switch forwards packets from input port to output port port
More informationHWP2 Application level query routing HWP1 Each peer knows about every other beacon B1 B3
HWP2 Application level query routing HWP1 Each peer knows about every other beacon B2 B1 B3 B4 B5 B6 11-Feb-02 Computer Networks 1 HWP2 Query routing searchget(searchkey, hopcount) Rget(host, port, key)
More informationResearch paper Measured Capacity of an Ethernet: Myths and Reality
Research paper Measured apacity of an Ethernet: Myths and Reality Theoretical work seems to suggest that Ethernet works saturate at 7%. Realistic networks can offer higher throughputs Lessons learnt Don
More informationSwitching and Forwarding Reading: Chapter 3 1/30/14 1
Switching and Forwarding Reading: Chapter 3 1/30/14 1 Switching and Forwarding Next Problem: Enable communication between hosts that are not directly connected Fundamental Problem of the Internet or any
More informationPacket Switching. Hongwei Zhang Nature seems to reach her ends by long circuitous routes.
Problem: not all networks are directly connected Limitations of directly connected networks: limit on the number of hosts supportable limit on the geographic span of the network Packet Switching Hongwei
More informationCSCI Computer Networks
CSCI-1680 - Computer Networks Link Layer III: LAN & Switching Chen Avin Based partly on lecture notes by David Mazières, Phil Levis, John Jannotti, Peterson & Davie, Rodrigo Fonseca Today: Link Layer (cont.)
More informationOutline. Routing. Introduction to Wide Area Routing. Classification of Routing Algorithms. Introduction. Broadcasting and Multicasting
Outline Routing Fundamentals of Computer Networks Guevara Noubir Introduction Broadcasting and Multicasting Shortest Path Unicast Routing Link Weights and Stability F2003, CSG150 Fundamentals of Computer
More informationCSE 461: Bridging LANs. Last Topic
CSE 461: Bridging LANs Last Topic Medium Access Control (MAC) protocols Part of the Link Layer At the heart of Local Area Networks (LANs) How do multiple parties share a wire or the air? Random access
More informationL9: Bridges and LAN Switches. Hui Chen, Ph.D. Dept. of Engineering & Computer Science Virginia State University Petersburg, VA 23806
L9: Bridges and LAN Switches Hui Chen, Ph.D. Dept. of Engineering & Computer Science Virginia State University Petersburg, VA 23806 1 Acknowledgements Some pictures used in this presentation were obtained
More informationPacket Switching Techniques
Packet Switching Techniques 188lecture3.ppt Pasi Lassila 1 Problem Aim: Build larger networks connecting more users also spanning different network technologies Shared media networks limited number of
More informationLecture 7. Reminder: Homework 2, Programming Project 1 due today. Homework 3, Programming Project 2 out, due Thursday next week. Questions?
Lecture 7 Reminder: Homework 2, Programming Project 1 due today. Homework 3, Programming Project 2 out, due Thursday next week. Questions? Thursday, September 15 CS 475 Networks - Lecture 7 1 Outline Chapter
More informationCSCI-1680 Link Layer Wrap-Up Rodrigo Fonseca
CSCI-1680 Link Layer Wrap-Up Rodrigo Fonseca Based partly on lecture notes by David Mazières, Phil Levis, John Jannotti Administrivia Homework I out later today, due next Thursday Today: Link Layer (cont.)
More informationCSCI-1680 Link Layer Wrap-Up Rodrigo Fonseca
CSCI-1680 Link Layer Wrap-Up Rodrigo Fonseca Based partly on lecture notes by David Mazières, Phil Levis, John Janno< Administrivia Homework I out later today, due next Thursday, Sep 25th Today: Link Layer
More informationCSCI-1680 Link Layer Wrap-Up Rodrigo Fonseca
CSCI-1680 Link Layer Wrap-Up Rodrigo Fonseca Based partly on lecture notes by David Mazières, Phil Levis, John Janno< Administrivia Homework I out later today, due next ursday, Sep 27th Today: Link Layer
More informationLecture 6: Bridges and Switches. CS/ECE 438: Communication Networks Prof. Matthew Caesar February 19, 2010
Lecture 6: ridges and Switches CS/C 48: Communication Networks Prof. Matthew Caesar February 9, How can many hosts communicate? Naïve approach: full mesh Problem: doesn t scale How can many hosts communicate?
More informationMedium Access Protocols
Medium Access Protocols Summary of MAC protocols What do you do with a shared media? Channel Partitioning, by time, frequency or code Time Division,Code Division, Frequency Division Random partitioning
More informationCSCI-1680 Link Layer Wrap-Up Rodrigo Fonseca
CSCI-1680 Link Layer Wrap-Up Rodrigo Fonseca Based partly on lecture notes by David Mazières, Phil Levis, John Jannotti Today: Link Layer (cont.) Framing Reliability Error correction Sliding window Medium
More informationPacket Switching. Guevara Noubir Fundamentals of Computer Networks. Computer Networks: A Systems Approach, L. Peterson, B. Davie, Morgan Kaufmann
Guevara Noubir Textbook: Chapter 3. Computer Networks: A Systems Approach, L. Peterson, B. Davie, Morgan Kaufmann Outline Store- and- Forward Switches Cell Switching Segmenta?on and Reassembly Bridges
More informationCompSci 356: Computer Network Architectures. Lecture 7: Switching technologies Chapter 3.1. Xiaowei Yang
CompSci 356: Computer Network Architectures Lecture 7: Switching technologies Chapter 3.1 Xiaowei Yang xwy@cs.duke.edu Types of switching Datagram Virtual circuit Source routing Today Bridges and LAN switches
More informationData Communication & Computer Networks INFO
Data Communication & Computer Networks INFO Instructor: Dr. A. SARI Department: Management Information Systems Course Code: MIS 305 Academic Term: 2013/2014 Fall Title: Data Communication & Computer Networks
More informationInternetworking Part 1
CMPE 344 Computer Networks Spring 2012 Internetworking Part 1 Reading: Peterson and Davie, 3.1 22/03/2012 1 Not all networks are directly connected Limit to how many hosts can be attached Point-to-point:
More informationAdministrivia CSC458 Lecture 4 Bridging LANs and IP. Last Time. This Time -- Switching (a.k.a. Bridging)
Administrivia CSC458 Lecture 4 Bridging LANs and IP Homework: # 1 due today # 2 out today and due in two weeks Readings: Chapters 3 and 4 Project: # 2 due next week Tutorial today: Joe Lim on project 2
More informationSwitching and bridging
Switching and bridging CSCI 466: Networks Keith Vertanen Fall 2011 Last chapter: Overview Crea7ng networks from: Point- to- point links Shared medium (wireless) This chapter: SoCware and hardware connec7ng
More informationCompSci 356: Computer Network Architectures. Lecture 8: Spanning Tree Algorithm and Basic Internetworking Ch & 3.2. Xiaowei Yang
CompSci 356: Computer Network Architectures Lecture 8: Spanning Tree Algorithm and Basic Internetworking Ch 3.1.5 & 3.2 Xiaowei Yang xwy@cs.duke.edu Review Past lectures Single link networks Point-to-point,
More informationECE 4450:427/527 - Computer Networks Spring 2017
ECE 4450:427/527 - Computer Networks Spring 2017 Dr. Nghi Tran Department of Electrical & Computer Engineering Lecture 6.1: Internetworking Dr. Nghi Tran (ECE-University of Akron) ECE 4450:427/527 Computer
More informationCSE/EE 461 Lecture 7 Bridging LANs. Last Two Times. This Time -- Switching (a.k.a. Bridging)
S/ 461 Lecture 7 ridging LNs Last Two Times Medium ccess ontrol (M) protocols Part of the Link Layer t the heart of Local rea Networks (LNs) ow do multiple parties share a wire or the air? Random access
More informationChapter 3 Part 2 Switching and Bridging. Networking CS 3470, Section 1
Chapter 3 Part 2 Switching and Bridging Networking CS 3470, Section 1 Refresher We can use switching technologies to interconnect links to form a large network What is a hub? What is a switch? What is
More informationCSEP 561 LAN Switches. David Wetherall
CSEP 561 LAN Switches David Wetherall djw@cs.washington.edu How to combine links into a simple network Topics: Switch internals Plug and play LANs (switched Ethernet) Application Transport Network Building
More informationReminder: Datalink Functions Computer Networking. Datalink Architectures
Reminder: Datalink Functions 15-441 15 441 15-641 Computer Networking Lecture 5 Media Access Control Peter Steenkiste Fall 2015 www.cs.cmu.edu/~prs/15-441-f15 Framing: encapsulating a network layer datagram
More informationCopyright 2010, Elsevier Inc. All rights Reserved
Computer Networks: A Systems Approach, 5e Larry L. Peterson and Bruce S. Davie C 3 Internetworking Copyright 2010, Elsevier Inc. All rights Reserved Switching and Forwarding Store-and-Forward Switches
More informationL8: Packet Switching. Hui Chen, Ph.D. Dept. of Engineering & Computer Science Virginia State University Petersburg, VA 23806
L8: Packet Switching Hui Chen, Ph.D. Dept. of Engineering & Computer Science Virginia State University Petersburg, VA 23806 1 Acknowledgements Some pictures used in this presentation were obtained from
More informationTroubleshooting Transparent Bridging Environments
CHAPTER Troubleshooting Transparent Bridging Environments Transparent bridges were first developed at Digital Equipment Corporation (Digital) in the early 1980s and are now very popular in Ethernet/IEEE
More informationEEC-484/584 Computer Networks
EEC-484/584 Computer Networks Lecture 13 wenbing@ieee.org (Lecture nodes are based on materials supplied by Dr. Louise Moser at UCSB and Prentice-Hall) Outline 2 Review of lecture 12 Routing Congestion
More informationEPL606. Internetworking. Part 2a. 1Network Layer
EPL606 Internetworking Part 2a The majority of the slides in this course are adapted from the accompanying slides to the books by Larry Peterson and Bruce Davie and by Jim Kurose and Keith Ross. Additional
More informationNetwork Layer. The Network Layer. Contents Connection-Oriented and Connectionless Service. Recall:
Network Layer The Network Layer Recall: The network layer is responsible for the routing of packets The network layer is responsible for congestion control 1 2 Contents 4.1.1 Connection-Oriented and Connectionless
More informationNetwork Layer. Recall: The network layer is responsible for the routing of packets The network layer is responsible for congestion control
The Network Layer 1 Network Layer Recall: The network layer is responsible for the routing of packets The network layer is responsible for congestion control 2 Contents Connection-Oriented (virtual circuit)
More informationCommunication Networks ( ) / Spring 2011 The Blavatnik School of Computer Science, Tel-Aviv University. Allon Wagner
Communication Networks (0368-3030) / Spring 2011 The Blavatnik School of Computer Science, Tel-Aviv University Allon Wagner Kurose & Ross, Chapters 5.5-5.6 (5 th ed.) Tanenbaum & Wetherall, Chapters 4.3.4
More informationTroubleshooting Transparent Bridging Environments
Troubleshooting Transparent Bridging Environments Document ID: 10543 This information from the Internetwork Troubleshooting Guide was first posted on CCO here. As a service to our customers, selected chapters
More informationCS/ECE 438: Communication Networks for Computers Spring 2018 Midterm Examination Online
1 CS/ECE 438: Communication Networks for Computers Spring 2018 Midterm Examination Online Solutions 1. General Networking a. In traditional client-server communication using TCP, a new socket is created.
More informationNetworking interview questions
Networking interview questions What is LAN? LAN is a computer network that spans a relatively small area. Most LANs are confined to a single building or group of buildings. However, one LAN can be connected
More informationRevision of Previous Lectures
Lecture 15 Overview Last Lecture Local area networking This Lecture Wide area networking 1 Source: chapters 8.1-8.3, 17.1, 18.1, 18.2 Next Lecture Wide area networking 2 Source: Chapter 20 COSC244 Lecture
More informationSwitching / Forwarding
Switching / Forwarding A switch is a device that allows interconnection of links to form larger networks Multi-input, multi-output device Packet switch transfers packets from an input to one or more outputs
More informationAdministrivia. Homework on class webpage If you are having problems following me in class (or doing the homework problems), please buy the textbook
Administrivia Homework on class webpage If you are having problems following me in class (or doing the homework problems), please buy the textbook Project Discussion class_ gotcha Reading finally on webpage
More informationSome portions courtesy Srini Seshan or David Wetherall
CSE 123 Computer Networks Fall 2009 Lecture 6: Data-Link III: Hubs, Bridges and Switches Some portions courtesy Srini Seshan or David Wetherall Misc Homework solutions have been posted I ll post a sample
More information===================================================================== Exercises =====================================================================
===================================================================== Exercises ===================================================================== 1 Chapter 1 1) Design and describe an application-level
More informationIntroduction to Communication Networks Spring Unit 13 Network extensions Bridges.
Introduction to Communication Networks Spring 2007 Unit 13 Network extensions Bridges. Acknowledgements slides coming from: The book by Peterson/Davie The book by Wiliam Stallings Slides from lectures
More informationLecture 10: Internetworking"
Lecture 10: Internetworking" CSE 123: Computer Networks Alex C. Snoeren HW 2 due NOW! Lecture 10 Overview" Spanning Tree Internet Protocol Service model Packet format 2 Spanning Tree Algorithm" Each bridge
More informationLecture 8: Networks to Internetworks
Lecture 8: Networks to Internetworks CSE 123: Computer Networks Alex C. Snoeren NO CLASS FRIDAY Lecture 8 Overview Bridging & switching Learning bridges Spanning Tree Internetworking Routering Internet
More informationCSCI 466 Midterm Networks Fall 2011
CSCI 466 Midterm Networks Fall 2011 Name: This exam consists of 7 problems on the following 9 pages. You may use your single- sided hand- written 8 ½ x 11 note sheet and a calculator during the exam. No
More informationCSE 123: Computer Networks Alex C. Snoeren. HW 2 due Thursday 10/21!
CSE 123: Computer Networks Alex C. Snoeren HW 2 due Thursday 10/21! Finishing up media access Contention-free methods (rings) Moving beyond one wire Link technologies have limits on physical distance Also
More informationData Communications. Connecting Devices
Data Communications Connecting Devices Connecting Devices Networks do not normally operate in isolation. They are connected to one another or to the Internet. To connect LANs, or segments of LANs, we use
More informationInternet Protocols (chapter 18)
Internet Protocols (chapter 18) CSE 3213 Fall 2011 Internetworking Terms 1 TCP/IP Concepts Connectionless Operation Internetworking involves connectionless operation at the level of the Internet Protocol
More informationLecture 9: Bridging & Switching"
Lecture 9: Bridging & Switching" CSE 123: Computer Networks Alex C. Snoeren HW 2 due Wednesday! Lecture 9 Overview" Finishing up media access Contention-free methods (rings) Moving beyond one wire Link
More informationCSCI 466 Midterm Networks Fall 2011
CSCI 466 Midterm Networks Fall 2011 Name: This exam consists of 7 problems on the following 9 pages. You may use your single- sided hand- written 8 ½ x 11 note sheet and a calculator during the exam. No
More informationLecture 7. Network Layer. Network Layer 1-1
Lecture 7 Network Layer Network Layer 1-1 Agenda Introduction to the Network Layer Network layer functions Service models Network layer connection and connectionless services Introduction to data routing
More informationCPE 448/548 Exam #1 (100 pts) February 14, Name Class: 448
Name Class: 448 1) (14 pts) A message M = 11001 is transmitted from node A to node B using the CRC code. The CRC generator polynomial is G(x) = x 3 + x 2 + 1 ( bit sequence 1101) a) What is the transmitted
More informationThe Spanning Tree Protocol
Università Ca Foscari di Venezia Dipartimento di Informatica Corso di Sistemi Distribuiti 2009 Presentation outline Introduction 1 Introduction Local internetworking Motivations 2 High level description
More informationChapter 3 Packet Switching
Chapter 3 Packet Switching Self-learning bridges: Bridge maintains a forwarding table with each entry contains the destination MAC address and the output port, together with a TTL for this entry Destination
More informationConfiguring Transparent Bridging
Configuring Transparent Bridging Document ID: 10676 Contents Introduction Before You Begin Conventions Prerequisites Components Used Bridging Transparent Bridging Configuration Examples Example 1: Simple
More informationC13a: Packet Switching
CISC 7332X T6 C13a: Packet Switching Hui Chen Department of Computer & Information Science CUNY Brooklyn College 1 Acknowledgements Some pictures used in this presentation were obtained from the Internet
More informationCS519: Computer Networks. Lecture 1 (part 2): Jan 28, 2004 Intro to Computer Networking
: Computer Networks Lecture 1 (part 2): Jan 28, 2004 Intro to Computer Networking Remember this picture? How did the switch know to forward some packets to B and some to D? From the address in the packet
More informationCSE 123A Computer Networks
CSE 123A Computer Networks Winter 2005 Lecture 6: Data-Link III: Hubs, Bridges and Switches Some portions courtesy Srini Seshan or David Wetherall Last Time How do multiple hosts share a single channel?
More informationECE 333: Introduction to Communication Networks Fall 2001
ECE 333: Introduction to Communication Networks Fall 00 Lecture 9: Switching and Multiplexing More on transparent bridges. Introduction to Switching and Multiplexing Transparent bridges continued: Last
More informationExpected Time: 90 min PART-A Max Marks: 42
Birla Institute of Technology & Science, Pilani First Semester 2010-2011 Computer Networks (BITS C481) Comprehensive Examination Thursday, December 02, 2010 (AN) Duration: 3 Hrs Weightage: 40% [80M] Instructions-:
More informationIntroduction. IP Datagrams. Internet Service Paradigm. Routers and Routing Tables. Datagram Forwarding. Example Internet and Conceptual Routing Table
Introduction Datagram Forwarding Gail Hopkins Service paradigm IP datagrams Routing Encapsulation Fragmentation Reassembly Internet Service Paradigm IP Datagrams supports both connectionless and connection-oriented
More informationCSE 3214: Computer Network Protocols and Applications Network Layer
CSE 314: Computer Network Protocols and Applications Network Layer Dr. Peter Lian, Professor Department of Computer Science and Engineering York University Email: peterlian@cse.yorku.ca Office: 101C Lassonde
More informationECE 435 Network Engineering Lecture 21
ECE 435 Network Engineering Lecture 21 Vince Weaver http://web.eece.maine.edu/~vweaver vincent.weaver@maine.edu 27 November 2018 Announcements HW#9 was posted Project Status One e-mail per group One-line
More informationLast time. Wireless link-layer. Introduction. Characteristics of wireless links wireless LANs networking. Cellular Internet access
Last time Wireless link-layer Introduction Wireless hosts, base stations, wireless links Characteristics of wireless links Signal strength, interference, multipath propagation Hidden terminal, signal fading
More information15-441: Computer Networks Homework 1
15-441: Computer Networks Homework 1 Assigned: September 12, 2006 Due: September 21, 2006 1. Consider sending a file of size F = M * L bits over a path of Q links. Each link transmits at R bits/s. The
More informationCS Networks and Distributed Systems. Lecture 5: Bridging. Revised 1/14/13
CS 3700 Networks and Distributed Systems Lecture 5: Bridging Revised 1/14/13 Just Above the Data Link Layer 2 Application Presentation Session Transport Network Data Link Physical Bridging! How do we connect
More informationCS610- Computer Network Solved Subjective From Midterm Papers
Solved Subjective From Midterm Papers May 08,2012 MC100401285 Moaaz.pk@gmail.com Mc100401285@gmail.com PSMD01 CS610- Computer Network Midterm Examination - Fall 2011 1. Where are destination and source
More informationUDP: Datagram Transport Service
UDP: Datagram Transport Service 1 Topics Covered Introduction Transport Protocols and End-to-End Communication The User Datagram Protocol The Connectionless Paradigm Message-Oriented Interface UDP Communication
More informationTraditional network management methods have typically
Advanced Configuration for the Dell PowerConnect 5316M Blade Server Chassis Switch By Surendra Bhat Saurabh Mallik Enterprises can take advantage of advanced configuration options for the Dell PowerConnect
More informationBridging and Switching Basics
CHAPTER 4 Bridging and Switching Basics This chapter introduces the technologies employed in devices loosely referred to as bridges and switches. Topics summarized here include general link-layer device
More informationPart 5: Link Layer Technologies. CSE 3461: Introduction to Computer Networking Reading: Chapter 5, Kurose and Ross
Part 5: Link Layer Technologies CSE 3461: Introduction to Computer Networking Reading: Chapter 5, Kurose and Ross 1 Outline PPP ATM X.25 Frame Relay 2 Point to Point Data Link Control One sender, one receiver,
More informationVTU-NPTEL-NMEICT Project
PROBLEMS Module 05: Performance Metrics RTT (Round Trip Time) 1. Calculate the total time required transfer a 1.5 MB file in the following cases, assuming an RTT of 80 ms, a packet size of 1-KB data and
More informationIntroduction. The fundamental purpose of data communications is to exchange information between user's computers, terminals and applications programs.
Introduction The fundamental purpose of data communications is to exchange information between user's computers, terminals and applications programs. Simplified Communications System Block Diagram Intro-1
More informationSwitching & ARP Week 3
Switching & ARP Week 3 Module : Computer Networks Lecturer: Lucy White lbwhite@wit.ie Office : 324 Many Slides courtesy of Tony Chen 1 Ethernet Using Switches In the last few years, switches have quickly
More informationEE 122: Switching and Forwarding
Direct Lk Network Review EE : Switchg and Forwardg Kev Lai September, Data lk layer presents a sgle media (eg, sgle wire) network model Problem and solutions - Framg character stuffg, byte countg, bit
More informationVirtual University of Pakistan. Describe the Hidden Node and Exposed Node problems in Standard? VUSR. [Larry L. Peterson]
www..net Solution Assignment No. 2 Question No. 1 Describe the Hidden Node and Exposed Node problems in 802.11 Standard? Hidden Node Problem: Consider the figure below. [Larry L. Peterson] B can exchange
More informationData Link Layer. Our goals: understand principles behind data link layer services: instantiation and implementation of various link layer technologies
Data Link Layer Our goals: understand principles behind data link layer services: link layer addressing instantiation and implementation of various link layer technologies 1 Outline Introduction and services
More informationCMSC 332 Computer Networks Network Layer
CMSC 332 Computer Networks Network Layer Professor Szajda CMSC 332: Computer Networks Where in the Stack... CMSC 332: Computer Network 2 Where in the Stack... Application CMSC 332: Computer Network 2 Where
More informationNetwork Control and Signalling
Network Control and Signalling 1. Introduction 2. Fundamentals and design principles 3. Network architecture and topology 4. Network control and signalling 5. Network components 5.1 links 5.2 switches
More informationHW3 and Quiz. P14, P24, P26, P27, P28, P31, P37, P43, P46, P55, due at 3:00pm with both soft and hard copies, 11/11/2013 (Monday) TCP), 20 mins
HW3 and Quiz v HW3 (Chapter 3): R1, R2, R5, R6, R7, R8, R15, P14, P24, P26, P27, P28, P31, P37, P43, P46, P55, due at 3:00pm with both soft and hard copies, 11/11/2013 (Monday) v Quiz: 10/30/2013, Wednesday,
More informationModule 15: Network Structures
Module 15: Network Structures Background Topology Network Types Communication Communication Protocol Robustness Design Strategies 15.1 A Distributed System 15.2 Motivation Resource sharing sharing and
More informationGoal and Outline. Computer Networking. What Do We Need? Today s Story Lecture 3: Packet Switched Networks Peter Steenkiste
Goal and Outline 15-441 15-641 Computer Networking Lecture 3: Packet Switched Networks Peter Steenkiste Fall 2016 www.cs.cmu.edu/~prs/15 441 F16 Goal: gain a basic understanding of how you can build a
More information3. What could you use if you wanted to reduce unnecessary broadcast, multicast, and flooded unicast packets?
Nguyen The Nhat - Take Exam Exam questions Time remaining: 00: 00: 51 1. Which command will give the user TECH privileged-mode access after authentication with the server? username name privilege level
More informationCSEP 561 Internetworking. David Wetherall
CSEP 561 Internetworking David Wetherall djw@cs.washington.edu Internetworking t Focus: Joining multiple, different networks into one larger network Forwarding models Application Heterogeneity Transport
More informationCommunication Networks - 3 general areas: data communications, networking, protocols
Communication Networks - Overview CSE 3213 Fall 2011 1 7 September 2011 Course Content 3 general areas: data communications, networking, protocols 1. Data communications: basic concepts of digital communications
More informationLAN Interconnection and Other Link Layer Protocols
LAN Interconnection and Other Link Layer Protocols Ethernet dominant link layer technology for local-area networks Ethernet frame structure Kai Shen Dept. of Computer Science, University of Rochester Ethernet
More informationLAN Overview (part 2) Interconnecting LANs - Hubs
LAN Overview (part 2) CSE 3213 Fall 2011 1 November 2011 Interconnecting LANs - Hubs active central element of star layout each station connected to hub by two UTP lines hub acts as a repeater limited
More informationChapter 6 Connecting Device
Computer Networks Al-Mustansiryah University Elec. Eng. Department College of Engineering Fourth Year Class Chapter 6 Connecting Device 6.1 Functions of network devices Separating (connecting) networks
More informationRequest for Comments: S. Gabe Nortel (Northern Telecom) Ltd. May Nortel s Virtual Network Switching (VNS) Overview
Network Working Group Request for Comments: 2340 Category: Informational B. Jamoussi D. Jamieson D. Williston S. Gabe Nortel (Northern Telecom) Ltd. May 1998 Status of this Memo Nortel s Virtual Network
More informationNext Steps Spring 2011 Lecture #18. Multi-hop Networks. Network Reliability. Have: digital point-to-point. Want: many interconnected points
Next Steps Have: digital point-to-point We ve worked on link signaling, reliability, sharing Want: many interconnected points 6.02 Spring 2011 Lecture #18 multi-hop networks: design criteria network topologies
More informationCh. 4 - WAN, Wide Area Networks
1 X.25 - access 2 X.25 - connection 3 X.25 - packet format 4 X.25 - pros and cons 5 Frame Relay 6 Frame Relay - access 7 Frame Relay - frame format 8 Frame Relay - addressing 9 Frame Relay - access rate
More informationModule 1. Introduction. Version 2, CSE IIT, Kharagpur
Module 1 Introduction Version 2, CSE IIT, Kharagpur Introduction In this module we shall highlight some of the basic aspects of computer networks in two lessons. In lesson 1.1 we shall start with the historical
More informationMulticast Communications. Slide Set were original prepared by Dr. Tatsuya Susa
Multicast Communications Slide Set were original prepared by Dr. Tatsuya Susa Outline 1. Advantages of multicast 2. Multicast addressing 3. Multicast Routing Protocols 4. Multicast in the Internet 5. IGMP
More informationIntegrated Services. Integrated Services. RSVP Resource reservation Protocol. Expedited Forwarding. Assured Forwarding.
Integrated Services An architecture for streaming multimedia Aimed at both unicast and multicast applications An example of unicast: a single user streaming a video clip from a news site An example of
More information