Computer Networks Principles LAN - Ethernet
|
|
- Lydia Bennett
- 6 years ago
- Views:
Transcription
1 Computer s Principles LN - thernet Prof. ndrzej Duda duda@imag.fr Interconnection structure - layer subnetwork interconnection layer interconnection layer subnet subnet router switch (bridge) VLN Interconnection structure - layer Interconnection at layer interconnection layer switch (bridge) VLN Switches (bridges) interconnect s logically separate groups of s (VLNs) managed by one entity ype of the network broadcast Forwarding based on address flat address space forwarding tables: one entry per works if no loops careful management Spanning ree protocol not scalable Protocol architecture I thernet pplication ransport L PDU ( Frame) L PDU ( Frame) transceiver switch (bridge) Switches are layer intermediate systems ransparent forwarding Management protocols (Spanning ree, VLN) repeater terminator 6
2 Random ccess protocols When node has packet to send transmit at full channel data rate R. no a priori coordination among nodes two or more transmitting nodes -> collision, random access protocol specifies: how to detect collisions how to recover from collisions (e.g., via delayed retransmissions) xamples of random access protocols: LOH, slotted LOH CSM, CSM/CD (thernet), CSM/C (80.) CSM/CD (Collision Detection) CSM/CD (Carrier Sense Multiple ccess/ Collision Detection) carrier sensing, deferral if ongoing transmission collisions detected within short time colliding transmissions aborted, reducing channel wastage persistent transmission collision detection: easy in wired LNs: measure signal strengths, compare transmitted, received signals difficult in wireless LNs: receiver shut off while transmitting 7 8 CSM/CD algorithm CSM / CD Collision i = while (i <= maxttempts) do listen until channel is idle transmit and listen wait until (end of transmission) or (collision detected) if collision detected then stop transmitting, send jam bits ( bits) else wait for interframe delay (9.6!s) leave wait random time increment i end do 9 senses idle channel, starts transmitting shortly before, senses idle channel, starts transmitting 0 0 CSM / CD Jam Signal Random retransmission interval senses collision, continues to transmit the jam signal (-bit) senses collision, continues to transmit the jam signal 0 t r = random (0, k -) k = min (0, ttemptnb) slot time =. µs st collision, r = 0, nd collision, r = 0,,, 0 th, r = 0,,, 0 th, stop
3 CSM / CD Retransmission Retransmission interval waits random time t waits random time t=slottime < t =*slottime senses channel idle and transmits senses channel busy and defers to now waits until channel is idle 0 t t Round trip time Slot limits the interval during which collisions may occur µs +. µs <. µs ( bits) channel is acquired after. µs non-valid frames (results of collisions) < bits minimal frame size (data field 6 bytes) unit of the retransmission interval Frame format (thernet v.) ddressing preamble dest source type data CRC 8 bytes 6 bytes 6 bytes bytes 6-00 bytes bytes Preamble synchronization : ddresses unique, unicast and multicast (starts with the first bit ) broadcast: ype upper layer protocol (IP, IPX, RP, etc.) address: 8 bits = adapter identifier sender puts destination address in the frame all stations read all frames; keep only if destination address matches all address (FF:FF:FF:FF:FF:FF) = broadcast address 08:00:0:7:0d:d C D 00:00:c0:f:6c:a 0:00:e:0:a6:cf (group address) 6 ddressing Data on thernet is transmitted least significant bit of first byte first (a bug dictated by Intel processors) Canonical representation thus inverts the order of bits inside a byte (the first bit of the address is the least significant bit of the first byte) examples of addresses: 0:00:e:0:a6:cf (a group address) 08:00:0:7:0d:d (a SUN machine) 00:00:c0:f:6c:a (a PC ) 00:00:0c:0:78:6 (a CISCO router) FF:FF:FF:FF:FF:FF the broadcast address s Function of a simple, port repeater: repeat bits received on one port to other port if collision sensed on one port, repeat random bits on other port One network with repeaters = one collision domain s perform only physical layer functions (bit repeaters) 7 8
4 From s to Hubs Multiport repeater (n ports), logically equivalent to: n simple repeater connected to one internal thernet segment Multi-port repeaters make it possible to use point-to-point segments (thernet in the box) ease of management fault isolation Multiport S S S thernet Hub UP segment Multiport 0 S Hubs ree topology (star) (répéteur multiport) max. s to other 9 0 ridges port ridge D port port ridges are intermediate systems, or switches, that forward frames to destinations based on addresses ransparent bridges: learn the Forwarding able C Forwarding able Dest Port Nb addr C D ransparent ridging () ridges are intermediate systems that forward frames to destinations based on addresses Interconnect systems beyond one LN segment, keeping main characteristics of LN without additional addresses addresses used to identify end systems nd systems ignore that there are transparent bridges bridge is transparent frames not changed by bridges frames not sent to bridge, but rather: bridge is promiscuous listens to all frames and retransmits if needed Collision domains s and ridges in OSI Model bridge to 7 pplication Presentation Session pplication Presentation Session to 7 ridges separate collision domains a bridged LN maybe much larger than a repeated LN there may be several frames transmitted in parallel in a bridged LN ransport L PDU ( Frame) L PDU ( Frame) ridges are layer intermediate systems ransport nd System /Hub ridge nd System s are in layer intermediate systems Routers are layer intermediate systems (IP routers)
5 Protocol architecture Switched thernet Switched thernet = bridge in the box pplication ransport L PDU (IP packet) pplication ransport otal bandwidth is not shared parallel frame transmission Half and full-duplex operation L PDU ( Frame) switch (bridge) L PDU ( Frame) router ridge ridge Routers are layer intermediate systems xplicit forwarding has to know the address of the first router Management protocols (control, routing, configuration) C D U V W X 6 Switching Store and forward receive full frame, check if valid, retransmit 0 µs delay for a 6 bytes frame Cut through address read, retransmit at line speed bytes read and decision made on output link if link busy, defaults to store and forward 0 µs delay for a 6 bytes frame transmission of non-valid frames CRC check at end of forwarding Flow control back pressure using false collision notification on full duplex links, send PUS to s VLN - Virtual LN Keep the advantages of Layer interconnection auto-configuration (addresses, topology - Spanning ree) performance of switching nhance with functionalities of Layer extensibility spanning large distances traffic filtering Limit broadcast domains Security separate subnetworks C D VLN ridge/switch VLN 7 8 Virtual LNs 80.Q No traffic between different VLNs VLNs build on bridges or switches VLN trunk D S data D S t tag data ridge/switch trunk ridge/switch 80. frame 80./P frame Frame encapsulation extension for assigning frame priority and VLN tag C D VLN VLN X Y Z U VLN VLN t - bytes of PI (ag Protocol Identifier): 0x800 tag - bytes of CI (ag Control Information): priority ( bits), VLN Id ( bits) (VID 0x00 often reserved for management) max length = bytes 9 0
6 agged VLNs VLN table VLN tag ports untagged,, tagged untagged, tagged C VLN VLN SWICH 6 trame non taguée interface physique IP em0 D trame taguée VLN em0 em0. interface IP em0. virtuelle Summary Original thernet is a shared medium: one collision domain per LN ridges are connectionless intermediate systems that interconnect LNs Using bridging, we can have several collision domains per LN thernet switches use bridging State of the art switched 00 Mb/s thernet to the Gb thernet between switches Wireless LNs become increasingly popular WiFi, luetooth
Computer Networks Principles LAN - Ethernet
Computer Networks Principles LAN - Ethernet Prof. Andrzej Duda duda@imag.fr http://duda.imag.fr 1 Interconnection structure - layer 3 interconnection layer 3 router subnetwork 1 interconnection layer 2
More informationBroadcast Links, Addressing and Media Access Control. Link Layer B. Link and Physical Layers. MAC Addresses
roadcast Links, ddressing and Media ccess Control Message M C Message M Link Layer In a broadcast, there are two additional issues that must be resolved How do the nodes agree on who gets to use the next?
More informationLecture 5 The Data Link Layer. Antonio Cianfrani DIET Department Networking Group netlab.uniroma1.it
Lecture 5 The Data Link Layer Antonio Cianfrani DIET Department Networking Group netlab.uniroma1.it Link Layer: setting the context two physically connected devices: host-router, router-router, host-host,
More informationVLAN and bridges. Transparent Bridging (TB) Transparent Bridging (TB) LB: Learning Bridge. Several Learning Bridges. Loops. Loop-Free topology
VLN and bridges dvanced Computer Networks Interconnection Layer : bridges and VLNs Contents Transparent bridges Spanning Tree Protocol (STP) apid Spanning Tree Protocol (STP) VLNs Prof. ndrzej uda duda@imag.fr
More informationAdaptors Communicating. Link Layer: Introduction. Parity Checking. Error Detection. Multiple Access Links and Protocols
Link Layer: Introduction daptors ommunicating Terminology: hosts and routers are nodes communication channels that connect adjacent nodes along communication path are links wired links wireless links LNs
More informationThe MAC Layer. Contents. Textbook. Jean Yves Le Boudec Fall 2012
The MAC Layer Jean Yves Le Boudec Fall 2012 1 Contents 1. MAC as Shared Medium : The Ethernet Myth and the WiFi Reality 2. MAC as interconnection at small scale : Why Ethernet became a point to point technology
More informationLecture 6 The Data Link Layer. Antonio Cianfrani DIET Department Networking Group netlab.uniroma1.it
Lecture 6 The Data Link Layer Antonio Cianfrani DIET Department Networking Group netlab.uniroma1.it Link Layer: setting the context two physically connected devices: host-router, router-router, host-host,
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 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 informationAnnouncements. CS 5565 Network Architecture and Protocols. Ethernet. Ethernet. Ethernet Model. Ideal Multiple Access Protocol
nnouncements CS 5565 Network rchitecture and Protocols Lecture 4 odmar ack Project due in parts: pr 5 and May xtra Credit Opportunities: xpand simulator (and your implementation) to introduce multiple
More informationContents. The MAC layer CN2. 1. MAC as Shared Medium 2. MAC as interconnection at small scale 3. MAC and Link layer. Jean-Yves Le Boudec, EPFL
ÉCOLE POLYTECHNIQUE FÉDÉRALE DE LAUSANNE The MAC layer Jean-Yves Le Boudec Fall 2007 1 Contents 1. MAC as Shared Medium 2. MAC as interconnection at small scale 3. MAC and Link layer 2 1: Shared Medium
More informationAdvanced Computer Networks
Advanced Computer Networks Interconnection Layer 2: bridges and VLANs Prof. Andrzej uda duda@imag.fr http://duda.imag.fr 1 Contents Transparent bridges Spanning Tree Protocol (STP) Rapid Spanning Tree
More informationAdaptors Communicating. Link Layer: Introduction. Parity Checking. Error Detection. Multiple Access Links and Protocols
Link Layer: Introduction daptors ommunicating hosts and routers are nodes links connect nodes wired links wireless links layer-2 packet is a frame, encapsulates datagram datagram controller sending host
More informationThe Link Layer and LANs: Ethernet and Swiches
The Link Layer and LNs: Ethernet and Swiches EECS3214 2018-03-21 Link layer, LNs: outline 6.1 introduction, services 6.2 error detection, correction 6.3 multiple access protocols 6.4 LNs addressing, RP
More informationLinks Reading: Chapter 2. Goals of Todayʼs Lecture. Message, Segment, Packet, and Frame
Links Reading: Chapter 2 CS 375: Computer Networks Thomas Bressoud 1 Goals of Todayʼs Lecture Link-layer services Encoding, framing, and error detection Error correction and flow control Sharing a shared
More informationThe MAC Layer. Clicker registration
The MAC Layer Jean Yves Le Boudec Fall 2012 1 Clicker registration Please note your clicker number Register it using the link on moodle before today 23:59 This will allow you to verify that your fun grade
More informationLink Layer and Ethernet
Link Layer and Ethernet 14-740: Fundamentals of Computer Networks Bill Nace Material from Computer Networking: A Top Down Approach, 6 th edition. J.F. Kurose and K.W. Ross traceroute Data Link Layer Multiple
More informationLink Layer and Ethernet
Link Layer and Ethernet 14-740: Fundamentals of Computer Networks Bill Nace Material from Computer Networking: A Top Down Approach, 6 th edition. J.F. Kurose and K.W. Ross traceroute Data Link Layer Multiple
More informationCN2 ÉCOLE POLYTECHNIQUE FÉDÉRALE DE LAUSANNE. The MAC layer. Jean-Yves Le Boudec Fall Jean-Yves Le Boudec, EPFL
ÉCOLE POLYTECHNIQUE FÉDÉRALE DE LAUSANNE The MAC layer Jean-Yves Le Boudec Fall 2009 1 Contents 1. MAC as Shared Medium 2. MAC as interconnection at small scale 3. MAC and Link layer 2 1: Shared Medium
More informationLinks. Error Detection. Link Layer. Multiple access protocols. Nodes Links Frame. Shared channel Problem: collisions How nodes share a channel
Link Layer Error Detection Nodes Links Frame R yclic Redundancy hecksum Parity its More about this in exercise! Data Link Layer -1 Data Link Layer -2 Links Two types of links : point-to-point broadcast
More informationLink Layer: Introduction. Chapter 5 Link Layer & LANS. Link layer: context. Link Layer Services
Chapter 5 Link Layer & LNS Link Layer: Introduction Some terminology: hosts and routers are nodes communication channels that connect adjacent nodes along communication path are links wired links wireless
More informationLink Layer: Introduction. Chapter 5 Link Layer & LANS. Link layer: context. Link Layer Services
Chapter 5 Link Layer & LNS Link Layer: Introduction Some terminology: hosts and routers are nodes communication channels that connect adjacent nodes along communication path are links wired links wireless
More informationNetworking Technologies and Applications
Networking Technologies and Applications Rolland Vida BME TMIT September 23, 2016 Aloha Advantages: Different size packets No need for synchronization Simple operation If low upstream traffic, the solution
More informationSummary of MAC 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 (dynamic) ALOHA, S-ALOHA,
More informationUnit 8. Spanning Tree protocol, Virtual LANs (VLANs) and Access Networks
nit 8 panning ree protocol, Virtual s (Vs) and ccess etworks panning ree Protocol (P) Designed to prevent bridging loops ach bridge has unique D consisting of Priority + address n power up the bridge or
More informationRedes de Computadores. Medium Access Control
Redes de Computadores Medium Access Control Manuel P. Ricardo Faculdade de Engenharia da Universidade do Porto 1 » How to control the access of computers to a communication medium?» What is the ideal Medium
More informationPrinciples behind data link layer services
Data link layer Goals: Principles behind data link layer services Error detection, correction Sharing a broadcast channel: Multiple access Link layer addressing Reliable data transfer, flow control: Done!
More informationCCM 4300 Lecture 6 Computer Networks, Wireless and Mobile Communications. Dr Shahedur Rahman. Room: T115
CCM 4300 Lecture 6 Computer Networks, Wireless and Mobile Communications Dr Shahedur Rahman s.rahman@mdx.ac.uk Room: T115 1 Recap of Last Session Access Control ALOHA FDMA, TDMA, CDMA OSI Model Internetworking
More informationData and Computer Communications. Chapter 11 Local Area Network
Data and Computer Communications Chapter 11 Local Area Network LAN Topologies Refers to the way in which the stations attached to the network are interconnected Bus Topology Used with multipoint medium
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 informationObjectives. Hexadecimal Numbering and Addressing. Ethernet / IEEE LAN Technology. Ethernet
2007 Cisco Systems, Inc. All rights reserved. Cisco Public Objectives Ethernet Network Fundamentals Chapter 9 ITE PC v4.0 Chapter 1 1 Introduce Hexadecimal number system Describe the features of various
More informationISO/OSI Model and Collision Domain NETWORK INFRASTRUCTURES NETKIT - LECTURE 1 MANUEL CAMPO, MARCO SPAZIANI
ISO/OSI Model and Collision Domain NETWORK INFRASTRUCTURES NETKIT - LECTURE 1 MANUEL CAMPO, MARCO SPAZIANI ISO/OSI Model ISO: International Organization for Standardization OSI: Open Systems Interconnection
More informationLAN PROTOCOLS. Beulah A AP/CSE
LAN PROTOCOLS Beulah A AP/CSE IEEE STANDARDS In 1985, the Computer Society of the IEEE started a project, called Project 802, to set standards to enable intercommunication among equipment from a variety
More informationLecture 9 The Data Link Layer part II. Antonio Cianfrani DIET Department Networking Group netlab.uniroma1.it
Lecture 9 The Data Link Layer part II Antonio Cianfrani DIET Department Networking Group netlab.uniroma1.it Physical Addresses Physical (or LAN or MAC) address: 48 bit string Hexadecimal representation
More informationThe MAC Layer. Jean Yves Le Boudec 2015
The MAC Layer Jean Yves Le Boudec 2015 1 Contents 1. MAC as Shared Medium : The Ethernet Myth and the WiFi Reality 2. MAC on cabled systems: the world of switches 3. Format and addresses 4. Virtual LANs
More informationThe MAC Layer. Jean Yves Le Boudec 2015
The MAC Layer Jean Yves Le Boudec 2015 1 Contents 1. MAC as Shared Medium : The Ethernet Myth and the WiFi Reality 2. MAC on cabled systems: the world of switches 3. Format and addresses 4. Virtual LANs
More informationLocal Area Network Overview
Local Area Network Overview Chapter 15 CS420/520 Axel Krings Page 1 LAN Applications (1) Personal computer LANs Low cost Limited data rate Back end networks Interconnecting large systems (mainframes and
More informationSession Exam 1. EG/ES 3567 Worked Solutions. (revised)
Session 003-00 Exam 1 EG/ES 3567 Worked Solutions. (revised) Please note that both exams have identical solutions, however the level of detail expected in ES is less, and the questions are phrased to provide
More informationDiscussions. What are the main service. Ch06 Link Layer. The Data Link Layer. Link Layer. Link Layer: Teminology. What are the services
Mobile network Discussions The Link Layer Yanmin Zhu Department of Computer Science and Engineering Global ISP Home network Regional ISP Institutional network What are the services provided by the link
More informationChapter 5 Link Layer and LANs
Chapter 5 Link Layer and LANs A note on the use of these ppt slides: All material copyright 1996-2007 J.F Kurose and K.W. Ross, All Rights Reserved Computer Networking: A Top Down Approach 4 th edition.
More informationThe MAC Layer. Mukhopadhyay. Jean Yves Le Boudec 2017
The MAC Layer Mukhopadhyay Jean Yves Le Boudec 2017 1 Contents 1. MAC as Shared Medium : The Ethernet Myth and the WiFi Reality 2. MAC on cabled systems: the world of switches 3. Format and addresses 4.
More informationCSE/EE 461 Section 2
CSE/EE 461 Section 2 Latency in a store-and-forward network 4ms, 10MB/s B How long does it take to send a 2kB packet from to B? 2ms, 10MB/s C 2ms, 10MB/s B What if it has to pass through a node C? Plan
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 informationPrinciples behind data link layer services:
Data link layer Goals: Principles behind data link layer services: Error detection, correction Sharing a broadcast channel: Multiple access Link layer addressing Reliable data transfer, flow control Example
More informationPrinciples behind data link layer services:
Data link layer Goals: Principles behind data link layer services: Error detection, correction Sharing a broadcast channel: Multiple access Link layer addressing Reliable data transfer, flow control Example
More informationTopics. Link Layer Services (more) Link Layer Services LECTURE 5 MULTIPLE ACCESS AND LOCAL AREA NETWORKS. flow control: error detection:
1 Topics 2 LECTURE 5 MULTIPLE ACCESS AND LOCAL AREA NETWORKS Multiple access: CSMA/CD, CSMA/CA, token passing, channelization LAN: characteristics, i basic principles i Protocol architecture Topologies
More informationPart3. Local Area Networks (LAN)
Part3 Local Area Networks (LAN) LAN Characteristics Small geographical area Relatively high data rate Single management Topologies Bus, star, ring Specifications at physical and data link layer mostly
More informationET4254 Communications and Networking 1
Topic 10:- Local Area Network Overview Aims:- LAN topologies and media LAN protocol architecture bridges, hubs, layer 2 & 3 switches 1 LAN Applications (1) personal computer LANs low cost limited data
More informationComputer Networks. Today. Principles of datalink layer services Multiple access links Adresavimas, ARP LANs Wireless LANs VU MIF CS 1/48 2/48
Computer Networks VU MIF CS 1/48 Today Principles of datalink layer services Multiple access links Adresavimas, ARP LANs Wireless LANs 2/48 1 Link layer: introduction terminology: hosts and routers: nodes
More informationCSE 461: Multiple Access Networks. This Lecture
CSE 461: Multiple Access Networks This Lecture Key Focus: How do multiple parties share a wire? This is the Medium Access Control (MAC) portion of the Link Layer Randomized access protocols: 1. Aloha 2.
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 informationThe MAC Layer. Mukhopadhyay. Jean Yves Le Boudec 2018
The MAC Layer Mukhopadhyay Jean Yves Le Boudec 2018 1 Contents 1. MAC as Shared Medium 2. MAC on cabled systems: the world of switches 3. Format and addresses 4. Virtual LANs 5. Architecture Aspects 6.
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 informationApplied Networks & Security
Applied Networks & Security Wired Local Area Networks (LANs) http://condor.depaul.edu/~jkristof/it263/ John Kristoff jtk@depaul.edu IT 263 Spring 2006/2007 John Kristoff - DePaul University 1 Local Area
More informationApplied Networks & Security
Applied Networks & Security Local Area Networks (LANs) http://condor.depaul.edu/~jkristof/it263/ John Kristoff jtk@depaul.edu IT 263 Winter 2006/2007 John Kristoff - DePaul University 1 Local Area Network
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 informationIntroduction to LAN Protocols
CHAPTER 2 Chapter Goals Learn about different LAN protocols. Understand the different methods used to deal with media contention. Learn about different LAN topologies. This chapter introduces the various
More informationLecture 4b. Local Area Networks and Bridges
Lecture 4b Local Area Networks and Bridges Ethernet Invented by Boggs and Metcalf in the 1970 s at Xerox Local area networks were needed to connect computers, share files, etc. Thick or Thin Ethernet Cable
More informationTHE OSI MODEL. Application Presentation Session Transport Network Data-Link Physical. OSI Model. Chapter 1 Review.
THE OSI MODEL Application Presentation Session Transport Network Data-Link Physical OSI Model Chapter 1 Review By: Allan Johnson Table of Contents Go There! Go There! Go There! Go There! Go There! Go There!
More informationCCM 4300 Lecture 5 Computer Networks, Wireless and Mobile Communications. Dr Shahedur Rahman. Room: T115
CCM 4300 Lecture 5 Computer Networks, Wireless and Mobile Communications Dr Shahedur Rahman s.rahman@mdx.ac.uk Room: T115 1 Recap of Last Session Described the physical layer Analogue and Digital signal
More informationMaster Course Computer Networks IN2097
Chair for Network Architectures and Services Prof. Carle Department for Computer Science TU München Master Course Computer Networks IN2097 Prof. Dr.-Ing. Georg Carle Christian Grothoff, Ph.D. Dr. Nils
More informationCH : 15 LOCAL AREA NETWORK OVERVIEW
CH : 15 LOCAL AREA NETWORK OVERVIEW P. 447 LAN (Local Area Network) A LAN consists of a shared transmission medium and a set of hardware and software for interfacing devices to the medium and regulating
More informationLecture 9: Bridging. CSE 123: Computer Networks Alex C. Snoeren
Lecture 9: Bridging CSE 123: Computer Networks Alex C. Snoeren Lecture 9 Overview Finishing up media access Ethernet Contention-free methods (rings) Moving beyond one wire Link technologies have limits
More informationIntroductory to Computer Networks Local Area Networks. Lecture 16 Fall Isfahan University of technology Dr.
Introductory to Computer Networks Local Area Networks Lecture 16 Fall 2010 Isfahan University of technology Dr. Faramarz Hendessi What is a LAN? Local area means: Private ownership freedom from regulatory
More informationLink Layer and LANs 안상현서울시립대학교컴퓨터 통계학과.
Link Layer and LANs 안상현서울시립대학교컴퓨터 통계학과 ahn@venus.uos.ac.kr Data Link Layer Goals: understand principles behind data link layer services: error detection, correction sharing a broadcast channel: multiple
More informationLecture 8 The Data Link Layer part I. Antonio Cianfrani DIET Department Networking Group netlab.uniroma1.it
Lecture 8 The Data Link Layer part I Antonio Cianfrani DIET Department Networking Group netlab.uniroma1.it Link Layer: setting the context two physically connected devices: host-router, router-router,
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 informationCMPE 150/L : Introduction to Computer Networks. Chen Qian Computer Engineering UCSC Baskin Engineering Lecture 16
CMPE 150/L : Introduction to Computer Networks Chen Qian Computer Engineering UCSC Baskin Engineering Lecture 16 1 Final project demo Please do the demo next week to the TAs. So basically you may need
More informationCS 421: COMPUTER NETWORKS SPRING FINAL May 8, minutes
CS 421: COMPUTR NTWORKS SPRIN 2016 INL May 8, 2016 150 minutes Name: Student No: Q1 Q2 Q3 TOT 1) a) (6 pts) iven the following parameters for a datagram packet switching network: N: number of hops between
More informationChapter 11 in Stallings 10 th Edition
Local Area Network Overview Chapter 11 in Stallings 10 th Edition CS420/520 Axel Krings Page 1 LAN Applications (1) Personal computer LANs Low cost Limited data rate Back end networks Interconnecting large
More informationInternetworking Concepts Overview. 2000, Cisco Systems, Inc. 2-1
Internetworking Concepts Overview 2000, Cisco Systems, Inc. 2-1 2000, Cisco Systems, Inc. www.cisco.com ICND v1.0a 2-2 Objectives On completion of this chapter, you will be able to perform the following
More informationOutline. Introduction to Networked Embedded Systems - Embedded systems Networked embedded systems Embedded Internet - Network properties
Outline Introduction to Networked Embedded Systems - Embedded systems Networked embedded systems Embedded Internet - Network properties Layered Network Architectures - OSI framework descriptions of layers
More informationChapter 5 Link Layer and LANs
Chapter 5 Link Layer and LANs A note on the use of these ppt slides: We re making these slides freely available to all (faculty, students, readers). They re in PowerPoint form so you can add, modify, and
More informationCS 455/555 Intro to Networks and Communications. Link Layer
CS 455/555 Intro to Networks and Communications Link Layer Dr. Michele Weigle Department of Computer Science Old Dominion University mweigle@cs.odu.edu http://www.cs.odu.edu/~mweigle/cs455-s13 1 Link Layer
More informationChapter 2. Switch Concepts and Configuration. Part I
Chapter 2 Switch Concepts and Configuration Part I CCNA3-1 Chapter 2-1 Note for Instructors These presentations are the result of a collaboration among the instructors at St. Clair College in Windsor,
More informationLAN Local Area Networks. CSMA/CD restriction. Bits on the Wire. PacketSize 2 * COMP476 Networked Computer Systems. Interconnecting
Interconnecting s COMP476 ed Computer Systems LN Local rea s There is a Limit to the Maximum Length of a LN - Ethernet cables (segments) can be up to 500m. - The restrictions are due to power and propagation
More informationThe random access methods we study in this chapter have evolved from a very interesting protocol known as ALOHA, which used a very simple procedure
Multiple Accesses When nodes or stations are connected and use a common link, called a multipoint or broadcast link, we need a multiple-access protocol to coordinate access to the link. The problem of
More informationThe Link Layer II: Ethernet
Monday Recap The Link Layer II: Ethernet q Link layer services q Principles for multiple access protocols q Categories of multiple access protocols CSC 249 March 24, 2017 1 2 Recap: Random Access Protocols
More informationIntroduction to LAN Protocols
CHAPTER 2 Introduction to LAN Protocols This chapter introduces the various media-access methods, transmission methods, topologies, and devices used in a local area network (LAN). Topics addressed focus
More informationLink layer, LANs: outline. Chapter 5-2 Link Layer. MAC addresses (more) MAC addresses
Chapter 5-2 Link Layer Computer Networking: Top Down pproach 6 th edition Jim Kurose, Keith Ross ddison-wesley March 2012 Link layer, LNs: outline 5.1 introduction, services 5.2 error detection, correction
More informationComputer Networks Medium Access Control. Mostafa Salehi Fall 2008
Computer Networks Medium Access Control Mostafa Salehi Fall 2008 2008 1 Outline Issues ALOHA Network Ethernet Token Ring Wireless 2 Main Issues Local Area Network (LAN) : Three or more machines are physically
More informationIEEE standards for local area networks
IEEE standards for local area networks Telecommunication Networks Group firstname.lastname@polito.it http://www.telematica.polito.it/ COMPUTER NETWORKS Standard for LANs 1 Copyright Quest opera è protetta
More informationComputer Networks Principles
Computer Networks Principles Introduction Prof. Andrzej Duda duda@imag.fr http://duda.imag.fr 1 Contents Introduction protocols and layered architecture encapsulation interconnection structures performance
More informationData Link Layer: Multi Access Protocols
Digital Communication in the Modern World Data Link Layer: Multi Access Protocols http://www.cs.huji.ac.il/~com1 com1@cs.huji.ac.il Some of the slides have been borrowed from: Computer Networking: A Top
More informationCHAPTER 7 MAC LAYER PROTOCOLS. Dr. Bhargavi Goswami Associate Professor & Head Department of Computer Science Garden City College
CHAPTER 7 MAC LAYER PROTOCOLS Dr. Bhargavi Goswami Associate Professor & Head Department of Computer Science Garden City College MEDIUM ACCESS CONTROL - MAC PROTOCOLS When the two stations transmit data
More informationCS 43: Computer Networks Switches and LANs. Kevin Webb Swarthmore College December 5, 2017
CS 43: Computer Networks Switches and LANs Kevin Webb Swarthmore College December 5, 2017 Ethernet Metcalfe s Ethernet sketch Dominant wired LAN technology: cheap $20 for NIC first widely used LAN technology
More informationModule 10 Data Link Layer CS655! 10-1!
Module 10 Data Link Layer CS655! 10-1! Please note: Most of these slides come from this book. Note their copyright notice below! A note on the use of these ppt slides: We re making these slides freely
More informationAccess Technologies! Fabio Martignon
Access Technologies! Fabio Martignon 1 LAN Ethernet - IEEE 802.3 Broadcast Bus Capacity=10 Mb/s Xerox-Intel-Digital inventors Standardized at the beginning of the 80s as IEEE 802.3 Big Success and Several
More informationChapter 6: Network Communications and Protocols
Learning Objectives Chapter 6: Network Communications and Protocols Understand the function and structure of packets in a network, and analyze and understand those packets Understand the function of protocols
More informationChapter 5: Link layer
Chapter 5: Link layer our goals: v understand principles behind link layer services: error detection, correction sharing a broadcast channel: multiple access link layer addressing local area networks:
More informationEthernet Hub. Campus Network Design. Hubs. Sending and receiving Ethernet frames via a hub
Campus Network Design Thana Hongsuwan Ethernet Hub 2003, Cisco Systems, Inc. All rights reserved. 1-1 2003, Cisco Systems, Inc. All rights reserved. BCMSN v2.0 1-2 Sending and receiving Ethernet frames
More informationLocal Area Networks (LANs) SMU CSE 5344 /
Local Area Networks (LANs) SMU CSE 5344 / 7344 1 LAN/MAN Technology Factors Topology Transmission Medium Medium Access Control Techniques SMU CSE 5344 / 7344 2 Topologies Topology: the shape of a communication
More informationMultiple Access Links and Protocols
Multiple Access Links and Protocols Two types of links : point-to-point PPP for dial-up access point-to-point link between Ethernet switch and host broadcast (shared wire or medium) old-fashioned Ethernet
More informationLocal Area Networks. Ethernet LAN
Local Area Networks Ethernet 802.3 LAN -7-1 Local Area Networks (Lokale Netze) Wide Area Network LAN -7-2 Local Area Networks What is a LAN? Multiple systems attached to an often shared medium high total
More informationCSE 461: Multiple Access. Homework: Chapter 2, problems 1, 8, 12, 18, 23, 24, 35, 43, 46, and 58
CSE 461: Multiple Access Homework: Chapter 2, problems 1, 8, 12, 18, 23, 24, 35, 43, 46, and 58 Next Topic Key Focus: How do multiple parties share a wire? This is the Medium Access Control (MAC) portion
More informationChapter 5: The Data Link Layer. Chapter 5 Link Layer and LANs. Ethernet. Link Layer. Star topology. Ethernet Frame Structure.
hapter 5 Link Layer and LNs omputer Networking: Top Down pproach 5 th edition. Jim Kurose, Keith Ross ddison-wesley, pril 2009. hapter 5: The Data Link Layer Our goals: understand principles behind data
More informationRaj Jain. The Ohio State University Columbus, OH
Columbus, OH 43210 Jain@CIS.Ohio-State.Edu http://www.cis.ohio-state.edu/~jain/ 3-1 Overview ISO/OSI Reference Model TCP/IP Reference Model Differences between ISO and TCP Ethernet/IEEE 802.3 LANs Interconnecting
More informationLecture 6. Data Link Layer (cont d) Data Link Layer 1-1
Lecture 6 Data Link Layer (cont d) Data Link Layer 1-1 Agenda Continue the Data Link Layer Multiple Access Links and Protocols Addressing Data Link Layer 1-2 Multiple Access Links and Protocols Two types
More informationLink Layer and LANs. Our Goals. Link Layer
Link Layer and LANs Instructor: Anirban Mahanti Office: ICT 745 Email: mahanti@cpsc.ucalgary.ca Class Location: ICT 121 Lectures: MWF 12:00 12:50 hours Notes derived from Computer Networking: A Top Down
More informationGetting Connected (Chapter 2 Part 4) Networking CS 3470, Section 1 Sarah Diesburg
Getting Connected (Chapter 2 Part 4) Networking CS 3470, Section 1 Sarah Diesburg Five Problems Encoding/decoding Framing Error Detection Error Correction Media Access Five Problems Encoding/decoding Framing
More information