Networking Acronym Smorgasbord: , DVMRP, CBT, WFQ
|
|
- Shawn Ellis
- 6 years ago
- Views:
Transcription
1 Networking Acronym Smorgasbord: , DVMRP, CBT, WFQ EE122 Fall 2011 Scott Shenker Materials with thanks to Jennifer Rexford, Ion Stoica, Vern Paxson and other colleagues at Princeton and UC Berkeley 1
2 Announcements Congratulations: You all got 100% on HW4 Worksheet will provide practice This is last week of sections See posting about additional office hours next week Next week will have office hours during class times Will work through problems on work sheet Be there or be square. Wednesday s Review: will figure something out. 2
3 Today s Lecture: Dim Sum of Design Wireless review Multicast Packet Scheduling Peer-to-peer 3
4 Wireless Review 4
5 History MACA proposal: basis for RTS/CTS in lecture Contention is at receiver, but CS detects sender! Replace carrier sense with RTS/CTS MACAW paper: extended and altered approach Implications of data ACKing Introducing DS in exchange: RTS-CTS-DS-Data-ACK o Shut up when hear DS or CTS Other clever but unused extensions for fairness, etc : uses carrier sense and RTS/CTS RTS/CTS often turned off, just use carrier sense When RTS/CTS turned on, shut up when hear either RTS/CTS augments carrier sense 5
6 What Will Be on the Final? General awareness of wireless (lecture) Reasoning about a given protocol If we used the following algorithm, what would happen? You are not expected to know which algorithm to use; we will tell you explicitly. 6
7 Multicast 7
8 Motivating Example: Internet Radio Internet concert More than 100,000 simultaneous online listeners Could we do this with parallel unicast streams? Bandwidth usage If each stream was 1Mbps, concert requires > 100Gbps Coordination Hard to keep track of each listener as they come and go Multicast addresses both problems. 8
9 Unicast approach does not scale Broadcast Center Backbone ISP 9
10 Instead build data replication trees Copy data at routers At most one copy of a data packet per link Broadcast Center Backbone ISP LANs implement link layer multicast by broadcasting Routers keep track of groups in real-time Routers compute trees and forward packets along them 10
11 Multicast Service Model R 0 S [G, data] Net R 1... R n Receivers join multicast group identified by a multicast address G Sender(s) send data to address G Network routes data to each of the receivers Note: multicast is both a delivery and a rendezvous mechanism Senders don t know list of receivers For many purposes, the latter is more important than the former 11
12 Multicast and Layering Multicast can be implemented at different layers link layer o e.g. Ethernet multicast network layer o e.g. IP multicast application layer o e.g. End system multicast Each layer has advantages and disadvantages Link: easy to implement, limited scope IP: global scope, efficient, but hard to deploy Application: less efficient, easier to deploy [not covered] 12
13 Multicast Implementation Issues How is join implemented? How is send implemented? How much state is kept and who keeps it? 13
14 Link Layer Multicast Join group at multicast address G NIC normally only listens for packets sent to unicast address A and broadcast address B After being instructed to join group G, NIC also listens for packets sent to multicast address G Send to group G Packet is flooded on all LAN segments, like broadcast Scalability: State: Only host NICs keep state about who has joined Bandwidth: Requires broadcast on all LAN segments Limitation: just over single LAN 14
15 Network Layer (IP) Multicast Performs inter-network multicast routing Relies on link layer multicast for intra-network routing Portion of IP address space reserved for multicast 2 28 addresses for entire Internet Open group membership Anyone can join (sends IGMP message) o Internet Group Management Protocol Privacy preserved at application layer (encryption) Anyone can send to group Even nonmembers 15
16 How Would YOU Design this? 5 Minutes. 16
17 IP Multicast Routing Intra-domain (know the basics here) Source Specific Tree: Distance Vector Multicast Routing Protocol (DVRMP) Shared Tree: Core Based Tree (CBT) Inter-domain [not covered] Protocol Independent Multicast Single Source Multicast 17
18 Distance Vector Multicast Routing Protocol Elegant extension to DV routing Using reverse paths! Use shortest path DV routes to determine if link is on the source-rooted spanning tree See whiteboard.. Three steps in developing DVRMP Reverse Path Flooding Reverse Path Broadcasting Truncated Reverse Path Broadcasting (pruning) 18
19 Reverse Path Flooding (RPF) If incoming link is shortest path to source Send on all links except incoming Otherwise, drop s:3 s:2 s:3 s:1 s:2 Issues: (fixed with RPB) s r Some links (LANs) may receive multiple copies Every link receives each multicast packet 19
20 Other Problems Flooding can cause a given packet to be sent multiple times over the same link S x y a z duplicate packet b Solution: Reverse Path Broadcasting 20
21 Reverse Path Broadcasting (RPB) Choose single parent for each link along reverse shortest path to source Only parent forwards to child link Identifying parent links Distance Lower address as tiebreaker Parent of z on reverse path forward only to child link child link of x for S a b x S 5 6 y z 21
22 Even after fixing this, not done This is still a broadcast algorithm the traffic goes everywhere Need to Prune the tree when there are subtrees with no group members Networks know they have members based on IGMP messages Add the notion of leaf nodes in tree They start the pruning process 22
23 Pruning Details Prune (Source,Group) at leaf if no members Send Non-Membership Report (NMR) up tree If all children of router R send NMR, prune (S,G) Propagate prune for (S,G) to parent R On timeout: Prune dropped Flow is reinstated Down stream routers re-prune Note: a soft-state approach 23
24 Distance Vector Multicast Scaling State requirements: O(Sources Groups) active state How to get better scaling? Hierarchical Multicast Core-based Trees 24
25 Core-Based Trees (CBT) Pick rendevouz point for the group (called core) Build tree from all members to that core Shared tree More scalable: Reduces routing table state from O(S x G) to O(G) 25
26 Use Shared Tree for Delivery Group members: M1, M2, M3 M1 sends data root M1 M2 M3 control (join) messages data 26
27 Barriers to Multicast Hard to change IP Multicast means changes to IP Details of multicast were very hard to get right Not always consistent with ISP economic model Charging done at edge, but single packet from edge can explode into millions of packets within network 27
28 Packet Scheduling 28
29 Scheduling Decide when and what packet to send on output link Classifier partitions incoming traffic into flows In some designs, each flow has their own FIFO queue flow 1 1 Classifier flow 2 Scheduler 2 flow n Buffer management 29
30 Packet Scheduling: FIFO What if scheduler uses one first-in first-out queue? Simple to implement But everyone gets the same service Example: two kinds of traffic Video conferencing needs low bandwidth and low delay o E.g., 1 Mbps and 100 msec delay not sensitive to delay, but need bandwidth Cannot admit much traffic Since it will interfere with the video conference traffic 30
31 Packet Scheduling: Strict Priority Strict priority Multiple levels of priority Always transmit high-priority traffic, when present.. and force the lower priority traffic to wait Isolation for the high-priority traffic Almost like it has a dedicated link Except for the (small) delay for packet transmission o High-priority packet arrives during transmission of low-priority o Router completes sending the low-priority traffic first 31
32 Scheduling: Weighted Fairness Limitations of strict priority Lower priority queues may starve for long periods even if the high-priority traffic can afford to wait Traffic still competes inside each priority queue Weighted fair scheduling Assign each queue a fraction of the link bandwidth Rotate across the queues on a small time scale Send extra traffic from one queue if others are idle 50% red, 25% blue, 25% green 32
33 Max-Min Fairness Given a set of bandwidth demands r i and a total bandwidth C, the max-min bandwidth allocations are: a i = min(f, r i ) where f is the unique value such that Sum(a i ) = C Property: If you don t get full demand, no one gets more than you 33
34 Computing Max-Min Fairness Denote C link capacity N number of flows r i arrival rate Max-min fair rate computation: 1. compute C/N (= the remaining fair share) 2. if there are flows i such that r i C/N then update C and N C = C r i s.t r i ; N = N k (for k such flows) i C / N and go to 1 3. if not, f = C/N; terminate 34
35 Example C = 10; r 1 = 8, r 2 = 6, r 3 = 2; N = 3 C/3 = 3.33 Can service all of r 3 Remove r 3 from the accounting: C = C r 3 = 8; N = 2 C/2 = 4 Can t service all of r 1 or r 2 So hold them to the remaining fair share: f = f = 4: min(8, 4) = 4 min(6, 4) = 4 min(2, 4) = 2 35
36 Fair Queuing (FQ) Conceptually, computes when each bit in the queue should be transmitted to attain max-min fairness (a fluid flow system approach) Then serve packets in the order of the transmission time of their last bits Allocates bandwidth in a max-min fairly 36
37 Example Flow 1 (arrival traffic) time Flow 2 (arrival traffic) time Service in fluid flow system time Packet system time 37
38 Fair Queuing (FQ) Provides isolation: Misbehaving flow can t impair others Could change congestion control paradigm o But not used. Doesn t solve congestion by itself: Still need to deal with individual queues filling up Generalized to Weighted Fair Queuing (WFQ) Can give preferences to classes of flows Used for quality of service (QoS) o Allocations to aggregates 38
CS 268: IP Multicast Routing
Motivation CS 268: IP Multicast Routing Ion Stoica April 8, 2003 Many applications requires one-to-many communication - E.g., video/audio conferencing, news dissemination, file updates, etc. Using unicast
More informationMulticast EECS 122: Lecture 16
Multicast EECS 1: Lecture 16 Department of Electrical Engineering and Computer Sciences University of California Berkeley Broadcasting to Groups Many applications are not one-one Broadcast Group collaboration
More informationAnnouncements. EECS 122: Introduction to Computer Networks Multicast and Overlay Networks. Motivational Example: Streaming Media
Announcements EEC : Introduction to Computer Networks Multicast and Overlay Networks Ion toica (and Brighten Godfrey) TAs: Lucian Popa, David Zats and Ganesh Ananthanarayanan http://inst.eecs.berkeley.edu/~ee/
More informationCS4700/CS5700 Fundamentals of Computer Networks
CS4700/CS5700 Fundamentals of Computer Networks Lecture 19: Multicast Routing Slides used with permissions from Edward W. Knightly, T. S. Eugene Ng, Ion Stoica, Hui Zhang Alan Mislove amislove at ccs.neu.edu
More informationQuality of Service (QoS)
Quality of Service (QoS) EE 122: Intro to Communication Networks Fall 2007 (WF 4-5:30 in Cory 277) Vern Paxson TAs: Lisa Fowler, Daniel Killebrew & Jorge Ortiz http://inst.eecs.berkeley.edu/~ee122/ Materials
More informationAnnouncements. Quality of Service (QoS) Goals of Today s Lecture. Scheduling. Link Scheduling: FIFO. Link Scheduling: Strict Priority
Announcements Quality of Service (QoS) Next week I will give the same lecture on both Wednesday (usual ) and next Monday Same and room Reminder, no lecture next Friday due to holiday EE : Intro to Communication
More informationMulticast service model Host interface Host-router interactions (IGMP) Multicast Routing Distance Vector Link State. Shared tree.
CSE 123A Computer Networks Fall 2009 Lecture 10 Internet Routing: Multicast Today: Multicast routing Multicast service model Host interface Host-router interactions (IGMP) Multicast Routing Distance Vector
More informationCSE 123A Computer Networks
CSE 123A Computer Networks Winter 2005 Lecture 12 Internet Routing: Multicast Today: Multicast routing Multicast service model Host interface Host-router interactions (IGMP) Multicast Routing Limiters
More informationContents. Overview Multicast = Send to a group of hosts. Overview. Overview. Implementation Issues. Motivation: ISPs charge by bandwidth
EECS Contents Motivation Overview Implementation Issues Ethernet Multicast IGMP Routing Approaches Reliability Application Layer Multicast Summary Motivation: ISPs charge by bandwidth Broadcast Center
More informationEE122: Multicast. Kevin Lai October 7, 2002
EE122: Multicast Kevin Lai October 7, 2002 Internet Radio www.digitallyimported.com (techno station) - sends out 128Kb/s MP3 music streams - peak usage ~9000 simultaneous streams only 5 unique streams
More informationEE122: Multicast. Internet Radio. Multicast Service Model 1. Motivation
Internet Radio EE122: Multicast Kevin Lai October 7, 2002 wwwdigitallyimportedcom (techno station) - sends out 128Kb/s MP music streams - peak usage ~9000 simultaneous streams only 5 unique streams (trance,
More informationQuality of Service (QoS)
Quality of Service (QoS) EE 122: Intro to Communication Networks Fall 2006 (MW 4-5:30 in Donner 155) Vern Paxson TAs: Dilip Antony Joseph and Sukun Kim http://inst.eecs.berkeley.edu/~ee122/ Materials with
More informationAnnouncements. Quality of Service (QoS) Goals of Today s Lecture. Scheduling. Link Scheduling: Strict Priority. Link Scheduling: FIFO
Announcements Homework #3 solutions now available Quality of Service (QoS) Reminder, phase of Project #3 due this Thurs evening with no slip days EE : Intro to Communication Networks Fall 006 (MW -5:30
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 informationWhat is Multicasting? Multicasting Fundamentals. Unicast Transmission. Agenda. L70 - Multicasting Fundamentals. L70 - Multicasting Fundamentals
What is Multicasting? Multicasting Fundamentals Unicast transmission transmitting a packet to one receiver point-to-point transmission used by most applications today Multicast transmission transmitting
More informationList of groups known at each router. Router gets those using IGMP. And where they are in use Where members are located. Enhancement to OSPF
Multicast OSPF OSPF Open Shortest Path First Link State Protocol Use Dijkstra s algorithm (SPF) Calculate shortest path from the router to every possible destination Areas Limit the information volume
More informationCS 356: Computer Network Architectures. Lecture 24: IP Multicast and QoS [PD] Chapter 4.2, 6.5. Xiaowei Yang
CS 356: Computer Network Architectures Lecture 24: IP Multicast and QoS [PD] Chapter 4.2, 6.5 Xiaowei Yang xwy@cs.duke.edu Overview Two historic important topics in networking Multicast QoS Limited Deployment
More informationMulticast Communications
Multicast Communications Multicast communications refers to one-to-many or many-tomany communications. Unicast Broadcast Multicast Dragkedja IP Multicasting refers to the implementation of multicast communication
More informationWhy multicast? The concept of multicast Multicast groups Multicast addressing Multicast routing protocols MBONE Multicast applications Conclusions
Tuomo Karhapää tuomo.karhapaa@otaverkko.fi Otaverkko Oy Why multicast? The concept of multicast Multicast groups Multicast addressing Multicast routing protocols MBONE Multicast applications Conclusions
More informationBandwidth measurement & Multicast
Bandwidth measurement & Multicast EECS 489 Computer Networks http://www.eecs.umich.edu/~zmao/eecs489 Z. Morley Mao Tuesday Nov 11, 004 Acknowledgement: Some slides taken from Kurose&Ross and Katz&Stoica
More informationBroadcast and Multicast Routing
Broadcast and Multicast Routing Daniel Zappala CS 460 Computer Networking Brigham Young University Group Communication 2/34 How can the Internet provide efficient group communication? send the same copy
More informationETSF10 Internet Protocols Routing on the Internet
ETSF10 Internet Protocols Routing on the Internet 2012, Part 2, Lecture 1.2 Kaan Bür, Jens Andersson Routing on the Internet Unicast routing protocols (part 2) [ed.4 ch.22.4] [ed.5 ch.20.3] Forwarding
More informationMulticast and Quality of Service. Internet Technologies and Applications
Multicast and Quality of Service Internet Technologies and Applications Aims and Contents Aims Introduce the multicast and the benefits it offers Explain quality of service and basic techniques for delivering
More informationFair Queueing. Presented by Brighten Godfrey. Slides thanks to Ion Stoica (UC Berkeley) with slight adaptation by Brighten Godfrey
Fair Queueing Presented by Brighten Godfrey Slides thanks to Ion Stoica (UC Berkeley) with slight adaptation by Brighten Godfrey Traditional queueing Traditional Internet - Congestion control mechanisms
More informationPage 1. This Week. CS 269: Lecture 11 Multicast A Tale of Two Failures. Multicast and QoS: the lost decade. Irony. History. Lectures.
This Week CS 269: Lecture 11 Multicast A Tale of Two Failures Scott Shenker and Ion Stoica Computer Science Division Department of Electrical Engineering and Computer Sciences University of California,
More informationBroadcast Routing. Multicast. Flooding. In-network duplication. deliver packets from source to all other nodes source duplication is inefficient:
Broadcast Routing Multicast deliver packets from source to all other nodes source duplication is inefficient: duplicate duplicate creation/transmission duplicate source duplication in-network duplication
More informationInternet Protocols Fall Lectures Inter-domain routing, mobility support, multicast routing Andreas Terzis
Internet Protocols Fall 2006 Lectures 11-12 Inter-domain routing, mobility support, multicast routing Andreas Terzis Outline Inter-domain Internet Routing BGP Routing for mobile nodes Multicast routing
More informationBandwidth measurement & Multicast
Capacity vs. Available Bandwidth Capacity: Maximum throughput without cross-traffic Bandwidth measurement & Multicast Available bandwidth: Maximum throughput given crosstraffic A A A A 4 EECS 49 Computer
More informationCSCE 463/612 Networks and Distributed Processing Spring 2018
CSCE 463/612 Networks and Distributed Processing Spring 2018 Network Layer V Dmitri Loguinov Texas A&M University April 17, 2018 Original slides copyright 1996-2004 J.F Kurose and K.W. Ross Chapter 4:
More informationMulticast Technology White Paper
Multicast Technology White Paper Keywords: Multicast, IGMP, IGMP Snooping, PIM, MBGP, MSDP, and SSM Mapping Abstract: The multicast technology implements high-efficiency point-to-multipoint data transmission
More informationLecture 24: Scheduling and QoS
Lecture 24: Scheduling and QoS CSE 123: Computer Networks Alex C. Snoeren HW 4 due Wednesday Lecture 24 Overview Scheduling (Weighted) Fair Queuing Quality of Service basics Integrated Services Differentiated
More informationMulticast Communications. Tarik Čičić, 4. March. 2016
Multicast Communications Tarik Čičić, 4. March. 06 Overview One-to-many communication, why and how Algorithmic approach: Steiner trees Practical algorithms Multicast tree types Basic concepts in multicast
More informationComputer Networks. Routing
Computer Networks Routing Topics Link State Routing (Continued) Hierarchical Routing Broadcast Routing Sending distinct packets Flooding Multi-destination routing Using spanning tree Reverse path forwarding
More informationAdvanced Networking. Multicast
Advanced Networking Multicast Renato Lo Cigno Renato.LoCigno@dit.unitn.it Homepage: disi.unitn.it/locigno/index.php/teaching-duties/advanced-networking Multicasting Addresses that refer to group of hosts
More informationHow did IP Multicast get so complicated?
How did IP Multicast get so complicated? Mark Handley ACIRI mjh@aciri.org Overview IP Multicast Service Model Multicast Addresses DVMRP (1988-1993) Broadcast and Prune PIM-DM (~1993) DVMRP for "real" routers
More informationIPv6 and Multicast. Outline. IPv6 Multicast. S Computer Networks - Spring 2005
IPv6 and Multicast 188lecture5.ppt Pasi Lassila 1 Outline IPv6 Multicast 2 IPv6 overview Motivation Internet growth (address space depletion and routing information eplosion) CIDR has helped but eventually
More informationNetwork Layer Enhancements
Network Layer Enhancements EECS 122: Lecture 14 Department of Electrical Engineering and Computer Sciences University of California Berkeley Today We have studied the network layer mechanisms that enable
More informationMULTICAST AND IGMPv3. Announcements. Today s Lecture. Multicast (No Sharing) Unicast. I. HW5 will be online today CIDR, subnets, routing
Announcements MULTICAST AND IGMPv3 I. HW5 will be online today CIDR, subnets, routing due in one week Internet Protocols CSC / ECE 573 Fall, 2005 N. C. State University II. Correction to calendar! copyright
More informationInternet is Based on Packet Switching. EECS 122: Introduction to Computer Networks Semester Wrap-Up. Design Principles. Recap: Course Goals
Internet is Based on Packet Switching CS 1: Introduction to Computer s Semester Wrap-Up Node in a packet switching network incoming links Node Memory outgoing links Computer Science Division Department
More informationETSF10 Internet Protocols Routing on the Internet
ETSF10 Internet Protocols Routing on the Internet 2013, Part 2, Lecture 1.2 Jens Andersson (Kaan Bür) Routing on the Internet Unicast routing protocols (part 2) [ed.5 ch.20.3] Multicast routing, IGMP [ed.5
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 informationGoals for Today s Class. EE 122: Networks & Protocols. What Global (non-digital) Communication Network Do You Use Every Day?
Goals for Today s Class EE 122: & Protocols Ion Stoica TAs: Junda Liu, DK Moon, David Zats http://inst.eecs.berkeley.edu/~ee122/fa09 (Materials with thanks to Vern Paxson, Jennifer Rexford, and colleagues
More informationFundamental Questions to Answer About Computer Networking, Jan 2009 Prof. Ying-Dar Lin,
Fundamental Questions to Answer About Computer Networking, Jan 2009 Prof. Ying-Dar Lin, ydlin@cs.nctu.edu.tw Chapter 1: Introduction 1. How does Internet scale to billions of hosts? (Describe what structure
More informationECE 158A: Lecture 13. Fall 2015
ECE 158A: Lecture 13 Fall 2015 Random Access and Ethernet! Random Access! Basic idea: Exploit statistical multiplexing Do not avoid collisions, just recover from them When a node has packet to send Transmit
More informationLecture 6: Multicast
Lecture 6: Multicast Challene: how do we efficiently send messaes to a roup of machines? Need to revisit all aspects of networkin Routin Autonomous systems and admin control Address allocation Conestion
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 informationLecture 19: Multicast. CSE 123: Computer Networks Stefan Savage
Lecture 19: Multicast CSE 123: Computer Networks Stefan Savage Today: Multicast routing Multicast service model Host interface Host-router interactions (IGMP) Multicast outing Limiters Distance Vector
More informationMohammad Hossein Manshaei 1393
Mohammad Hossein Manshaei manshaei@gmail.com 1393 Voice and Video over IP Slides derived from those available on the Web site of the book Computer Networking, by Kurose and Ross, PEARSON 2 Multimedia networking:
More informationComputer Network Fundamentals Spring Week 3 MAC Layer Andreas Terzis
Computer Network Fundamentals Spring 2008 Week 3 MAC Layer Andreas Terzis Outline MAC Protocols MAC Protocol Examples Channel Partitioning TDMA/FDMA Token Ring Random Access Protocols Aloha and Slotted
More informationNetwork Performance: Queuing
Network Performance: Queuing EE 122: Intro to Communication Networks Fall 2006 (MW 4-5:30 in Donner 155) Vern Paxson TAs: Dilip Antony Joseph and Sukun Kim http://inst.eecs.berkeley.edu/~ee122/ Materials
More informationFairness, Queue Management, and QoS
Fairness, Queue Management, and QoS 15-441 Fall 2017 Profs Peter Steenkiste & Justine Sherry Slides borrowed from folks at CMU, Berkeley, and elsewhere. YINZ I AM GETTING T-SHIRTS If you TA for me next
More informationRouter Design: Table Lookups and Packet Scheduling EECS 122: Lecture 13
Router Design: Table Lookups and Packet Scheduling EECS 122: Lecture 13 Department of Electrical Engineering and Computer Sciences University of California Berkeley Review: Switch Architectures Input Queued
More information4.2 Multicast IP supports multicast to support one-to-many (radio, news, IP multicast was originally a many-to-many (any source MC or
CS475 Networks Lecture 14 Chapter 4 Advanced Internetworking Assignments Reading for Lecture 15: Sections 5.1-5.2 Homework 5, Wireshark Project 3 posted, due next Thursday; Programming Project 3 posted,
More informationMulticast. Midterm. EECS 122: Lecture 16. University of California Berkeley. Exam was not meant to be easy
Multicast EECS : Lecture 6 Department of Electrical Engineering and Computer Sciences University of California Berkeley Midterm Exam was not meant to e easy Mean: 5 Median: 5 Std Dev: 8 Performance quite
More informationMulticast overview. Introduction to multicast. Information transmission techniques. Unicast
Contents Multicast overview 1 Introduction to multicast 1 Information transmission techniques 1 Multicast features 3 Common notations in multicast 4 Multicast advantages and applications 4 Multicast models
More informationEthernet. EE 122: Intro to Communication Networks. Fall 2007 (WF 4-5:30 in Cory 277) Vern Paxson TAs: Lisa Fowler, Daniel Killebrew & Jorge Ortiz
Ethernet EE 122: Intro to Communication Networks Fall 2007 (WF 4-5:30 in Cory 277) Vern Paxson TAs: Lisa Fowler, Daniel Killebrew & Jorge Ortiz http://inst.eecs.berkeley.edu/~ee122/ Materials with thanks
More informationETSF10 Internet Protocols Routing on the Internet
ETSF10 Internet Protocols Routing on the Internet 2014, Part 2, Lecture 1.2 Jens Andersson Internet Hierarchy 2014-11-10 ETSF05/ETSF05/ETSF10 - Internet Protocols 2 Hierarchical Routing aggregate routers
More informationTransport and TCP. EE122 Fall 2011 Scott Shenker
Transport and TCP EE122 Fall 2011 Scott Shenker http://inst.eecs.berkeley.edu/~ee122/ Materials with thanks to Jennifer Rexford, Ion Stoica, Vern Paxson and other colleagues at Princeton and UC Berkeley
More informationDATA COMMUNICATOIN NETWORKING
DATA COMMUNICATOIN NETWORKING Instructor: Ouldooz Baghban Karimi Course Book & Slides: Computer Networking, A Top-Down Approach By: Kurose, Ross Introduction Course Overview Basics of Computer Networks
More informationHigh Level View. EE 122: Ethernet and Random Access protocols. Medium Access Protocols
High Level View EE 122: Ethernet and 802.11 Ion Stoica September 18, 2002 Goal: share a communication medium among multiple hosts connected to it Problem: arbitrate between connected hosts Solution goals:
More informationThinking Architecturally (80 Minutes Inside Scott s Head)
Thinking Architecturally (80 Minutes Inside Scott s Head) EE122 Fall 2012 Scott Shenker http://inst.eecs.berkeley.edu/~ee122/ Materials with thanks to Jennifer Rexford, Ion Stoica, Vern Paxson and other
More informationIntegrated Services - Overview
Multicast QoS Need bandwidth/delay guarantees On many links unknown to sender Fortunately QoS development after multicast Takes multicast into account RSVP reservations from receivers toward sender rules
More informationOverview. Lecture 22 Queue Management and Quality of Service (QoS) Queuing Disciplines. Typical Internet Queuing. FIFO + Drop tail Problems
Lecture 22 Queue Management and Quality of Service (QoS) Overview Queue management & RED Fair queuing Khaled Harras School of Computer Science niversity 15 441 Computer Networks Based on slides from previous
More informationAdvanced Topics in Routing
Advanced Topics in Routing EE122 Fall 2012 Scott Shenker http://inst.eecs.berkeley.edu/~ee122/ Materials with thanks to Jennifer Rexford, Ion Stoica, Vern Paxson and other colleagues at Princeton and UC
More informationIP Multicast. Overview. Casts. Tarik Čičić University of Oslo December 2001
IP Multicast Tarik Čičić University of Oslo December 00 Overview One-to-many communication, why and how Algorithmic approach (IP) multicast protocols: host-router intra-domain (router-router) inter-domain
More informationIP Multicast Technology Overview
IP multicast is a bandwidth-conserving technology that reduces traffic by delivering a single stream of information simultaneously to potentially thousands of businesses and homes. Applications that take
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 informationNetwork Support for Multimedia
Network Support for Multimedia Daniel Zappala CS 460 Computer Networking Brigham Young University Network Support for Multimedia 2/33 make the best of best effort use application-level techniques use CDNs
More informationDD2490 p IP Multicast routing. Multicast routing. Olof Hagsand KTH CSC
DD2490 p4 2010 IP Multicast routing Multicast routing Olof Hagsand KTH CSC 1 Literature RFC 4601 Section 3 (you may need some definitions from Section 2). See reading instructions on web. 2 Deployment
More informationEE 122: Ethernet and
EE 122: Ethernet and 802.11 Ion Stoica September 18, 2002 (* this talk is based in part on the on-line slides of J. Kurose & K. Rose) High Level View Goal: share a communication medium among multiple hosts
More informationCSCI Spring Final Exam Solution
CSCI 4211 16Spring Final Exam Solution 1. When an IP packet arrives a router, how the router decides what is the next router (output link) this packet to be forwarded to? What are the routing table and
More informationLocal Area Networks (LANs): Packets, Frames and Technologies Gail Hopkins. Part 3: Packet Switching and. Network Technologies.
Part 3: Packet Switching and Gail Hopkins Local Area Networks (LANs): Packets, Frames and Technologies Gail Hopkins Introduction Circuit Switching vs. Packet Switching LANs and shared media Star, bus and
More informationPage 1. Quality of Service. CS 268: Lecture 13. QoS: DiffServ and IntServ. Three Relevant Factors. Providing Better Service.
Quality of Service CS 268: Lecture 3 QoS: DiffServ and IntServ Ion Stoica Computer Science Division Department of Electrical Engineering and Computer Sciences University of California, Berkeley Berkeley,
More informationIP Multicast Technology Overview
IP multicast is a bandwidth-conserving technology that reduces traffic by delivering a single stream of information simultaneously to potentially thousands of businesses and homes. Applications that take
More informationMissing Pieces of the Puzzle
Missing Pieces of the Puzzle EE122 Fall 2011 Scott Shenker http://inst.eecs.berkeley.edu/~ee122/ Materials with thanks to Jennifer Rexford, Ion Stoica, Vern Paxson and other colleagues at Princeton and
More informationAnnouncements. Network Performance: Queuing. Goals of Today s Lecture. Window Scaling. Window Scaling, con t. Window Scaling, con t
Announcements Network Performance: Queuing Additional reading for today s lecture: Peterson & Davie 3.4 EE 122: Intro to Communication Networks Fall 2006 (MW 4-5:30 in Donner 155) Vern Paxson As: Dilip
More informationCSCD 433/533 Advanced Networks Spring Lecture 22 Quality of Service
CSCD 433/533 Advanced Networks Spring 2016 Lecture 22 Quality of Service 1 Topics Quality of Service (QOS) Defined Properties Integrated Service Differentiated Service 2 Introduction Problem Overview Have
More informationMulticast overview. Introduction to multicast. Information transmission techniques. Unicast
Contents Multicast overview 1 Introduction to multicast 1 Information transmission techniques 1 Multicast features 3 Common notations in multicast 4 Multicast benefits and applications 4 Multicast models
More informationAnnouncements. IP Forwarding & Transport Protocols. Goals of Today s Lecture. Are 32-bit Addresses Enough? Summary of IP Addressing.
IP Forwarding & Transport Protocols EE 122: Intro to Communication Networks Fall 2007 (WF 4-5:30 in Cory 277) Vern Paxson TAs: Lisa Fowler, Daniel Killebrew & Jorge Ortiz http://inst.eecs.berkeley.edu/~ee122/
More informationLecture 3: Packet Forwarding
Lecture 3: Packet Forwarding CSE 222A: Computer Communication Networks Alex C. Snoeren Thanks: Mike Freedman & Amin Vahdat Lecture 3 Overview Paper reviews Packet Forwarding IP Addressing Subnetting/CIDR
More informationCSE 473 Introduction to Computer Networks. Final Exam. Your Name: 12/17/2014 PLEASE WRITE LEGIBLY NO POINTS FOR ILLEGIBLE ANSWERS
CSE 47 Introduction to Computer Networks Roch Guérin Final Exam Your Name: 12/17/2014 PLEASE WRITE LEGIBLY NO POINTS FOR ILLEGIBLE ANSWERS 1. [10 points] Bob has been provided with the following pair of
More informationBasics (cont.) Characteristics of data communication technologies OSI-Model
48 Basics (cont.) Characteristics of data communication technologies OSI-Model Topologies Packet switching / Circuit switching Medium Access Control (MAC) mechanisms Coding Quality of Service (QoS) 49
More informationNetworked Systems (SAMPLE QUESTIONS), COMPGZ01, May 2016
Networked Systems (SAMPLE QUESTIONS), COMPGZ01, May 2016 Answer TWO questions from Part ONE on the answer booklet containing lined writing paper, and answer ALL questions in Part TWO on the multiple-choice
More informationHands-On IP Multicasting for Multimedia Distribution Networks
Hands-On for Multimedia Distribution Networks Course Description This Hands-On course provides an in-depth look how IP multicasting works, its advantages and limitations and how it can be deployed to provide
More informationEECS 122, Lecture 16. Link Costs and Metrics. Traffic-Sensitive Metrics. Traffic-Sensitive Metrics. Static Cost Metrics.
EECS 122, Lecture 16 Kevin Fall kfall@cs.berkeley.edu edu Link Costs and Metrics Routing protocols compute shortest/cheapest paths using some optimization criteria Choice of criteria has strong effect
More informationIP Multicast. Falko Dressler Regionales Rechenzentrum Grundzüge der Datenkommunikation IP Multicast
Falko Dressler Regionales Rechenzentrum falko.dressler@rrze.uni-erlangen.de 1 Agenda Basics Principles of IP multicast, addressing, TTL Internet Group Management Protocol (IGMP) IGMPv1, v2, v3 Layer-2
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 informationTopic: Multicast routing
Topic: Multicast routing What you will learn Broadcast routing algorithms Multicasting IGMP Multicast routing algorithms Multicast routing in the Internet Multicasting 1/21 Unicasting One source node and
More informationMohamed Khedr.
Mohamed Khedr http://webmail.aast.edu/~khedr Tentatively Week 1 Week 2 Week 3 Week 4 Week 5 Week 6 Week 7 Week 8 Week 9 Week 10 Week 11 Week 12 Week 13 Week 14 Week 15 Overview Packet Switching IP addressing
More informationReal-Time Protocol (RTP)
Real-Time Protocol (RTP) Provides standard packet format for real-time application Typically runs over UDP Specifies header fields below Payload Type: 7 bits, providing 128 possible different types of
More informationReview. Error Detection: CRC Multiple access protocols. LAN addresses and ARP Ethernet. Slotted ALOHA CSMA/CD
Review Error Detection: CRC Multiple access protocols Slotted ALOHA CSMA/CD LAN addresses and ARP Ethernet Some slides are in courtesy of J. Kurose and K. Ross Overview Ethernet Hubs, bridges, and switches
More informationCSE 123b Communications Software
CSE 123b Communications Software Spring 2002 Lecture 10: Quality of Service Stefan Savage Today s class: Quality of Service What s wrong with Best Effort service? What kinds of service do applications
More information21: IP Multicast. Classic example: British and Indian communities in the US want to watch cricket. Americans worldwide want to watch baseball.
21: IP Multicast Mark Handley TV on the net Suppose you want to broadcast an event live to a million people worldwide, but your audience is too distributed for mainstream TV to carry. How do you do it?
More informationITEC310 Computer Networks II
ITEC310 Computer Networks II Chapter 22 Network Layer:, and Routing Department of Information Technology Eastern Mediterranean University Objectives 2/131 After completing this chapter you should be able
More informationExercises to Communication Systems
Exercises to Communication Systems IP Multicast Additional Slides Dr.-Ing. Falko Dressler Department of Computer Science 7 University of Erlangen ÜKS, WS 05/06 1 IP Multicast Introduction Internet Group
More informationEE 122: Introduction To Communication Networks. Some Questions & Answers
EE 122: Introduction To Communication Networks Fall 2007 (WF 4-5:30 in Cory 277) Vern Paxson TAs: Lisa Fowler, Daniel Killebrew & Jorge Ortiz http://inst.eecs.berkeley.edu/~ee122/ Materials with thanks
More informationIPv6 PIM. Based on the forwarding mechanism, IPv6 PIM falls into two modes:
Overview Protocol Independent Multicast for IPv6 () provides IPv6 multicast forwarding by leveraging static routes or IPv6 unicast routing tables generated by any IPv6 unicast routing protocol, such as
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 informationCongestion Control In the Network
Congestion Control In the Network Brighten Godfrey cs598pbg September 9 2010 Slides courtesy Ion Stoica with adaptation by Brighten Today Fair queueing XCP Announcements Problem: no isolation between flows
More informationIP Addressing & Forwarding
IP Addressing & Forwarding EE 122: Intro to Communication Networks Fall 2006 (MW 4-5:30 in Donner 155) Vern Paxson TAs: Dilip Antony Joseph and Sukun Kim http://inst.eecs.berkeley.edu/~ee122/ Materials
More information