The Link Layer and LANs: Ethernet and Swiches

Size: px
Start display at page:

Download "The Link Layer and LANs: Ethernet and Swiches"

Transcription

1 The Link Layer and LNs: Ethernet and Swiches EECS Link layer, LNs: outline 6.1 introduction, services 6.2 error detection, correction 6.3 multiple access protocols 6.4 LNs addressing, RP Ethernet switches VLNS 6.5 link virtualization: MPLS 6.6 data center networking 6.7 a day in the life of a web request Link Layer and LNs 6-2 1

2 MC addresses and RP 32-bit IP address: network-layer address for interface used for layer 3 (network layer) forwarding MC (or LN or physical or Ethernet) address: function: used locally to get frame from one interface to another physically-connected interface (same network, in IPaddressing sense) 48 bit MC address (for most LNs) burned in NIC ROM, also sometimes software settable e.g.: 1-2F D hexadecimal (base 16) notation (each numeral represents 4 bits) Link Layer and LNs 6-3 LN addresses and RP each adapter on LN has unique LN address 1-2F D F LN (wired or wireless) D7-F-20-0 adapter 0C-C4-11-6F-E3-98 Link Layer and LNs 6-4 2

3 LN addresses (more) MC address allocation administered by IEEE manufacturer buys portion of MC address space (to assure uniqueness) analogy: MC address: like Social Security Number IP address: like postal address MC flat address portability can move LN card from one LN to another IP hierarchical address not portable address depends on IP subnet to which node is attached Link Layer and LNs 6-5 RP: address resolution protocol Question: how to determine interface s MC address, knowing its IP address? F LN F D D7-F C-C4-11-6F-E3-98 RP table: each IP node (host, router) on LN has table IP/MC address mappings for some LN nodes: < IP address; MC address; TTL> TTL (Time To Live): time after which address mapping will be forgotten (typically 20 min) Link Layer and LNs 6-6 3

4 RP protocol: same LN wants to send datagram to s MC address not in s RP table. broadcasts RP query packet, containing 's IP address destination MC address = FF-FF-FF-FF-FF-FF all nodes on LN receive RP query receives RP packet, replies to with its ('s) MC address frame sent to s MC address (unicast) caches (saves) IP-to- MC address pair in its RP table until information becomes old (times out) soft state: information that times out (goes away) unless refreshed RP is plug-and-play : nodes create their RP tables without intervention from net administrator Link Layer and LNs 6-7 ddressing: routing to another LN walkthrough: send datagram from to via R focus on addressing at IP (datagram) and MC layer (frame) assume knows s IP address assume knows IP address of first hop router, R (how?) assume knows R s MC address (how?) C-E8-FF CC-49-DE-D0--7D R E6-E F9-CD D-D2-C F F Link Layer and LNs 6-8 4

5 ddressing: routing to another LN creates IP datagram with IP source, destination creates link-layer frame with R's MC address as destination address, frame contains -to- IP datagram IP Eth Phy MC src: C-E8-FF-55 MC dest: E6-E IP src: IP dest: C-E8-FF CC-49-DE-D0--7D R E6-E F9-CD D-D2-C F F Link Layer and LNs 6-9 ddressing: routing to another LN frame sent from to R frame received at R, datagram removed, passed up to IP MC src: C-E8-FF-55 MC dest: E6-E IP src: IP src: IP dest: IP dest: IP Eth Phy C-E8-FF CC-49-DE-D0--7D IP Eth Phy R E6-E F9-CD D-D2-C F F Link Layer and LNs

6 ddressing: routing to another LN R forwards datagram with IP source, destination R creates link-layer frame with 's MC address as destination address, frame contains -to- IP datagram C-E8-FF-55 IP Eth Phy R F9-CD-06-9 MC src: 1-23-F9-CD-06-9 MC dest: 49-D-D2-C IP src: IP dest: IP Eth Phy D-D2-C CC-49-DE-D0--7D E6-E F F Link Layer and LNs 6-11 ddressing: routing to another LN R forwards datagram with IP source, destination R creates link-layer frame with 's MC address as destination address, frame contains -to- IP datagram C-E8-FF-55 IP Eth Phy R F9-CD-06-9 MC src: 1-23-F9-CD-06-9 MC dest: 49-D-D2-C IP src: IP dest: IP Eth Phy D-D2-C CC-49-DE-D0--7D E6-E F F Link Layer and LNs

7 ddressing: routing to another LN R forwards datagram with IP source, destination R creates link-layer frame with 's MC address as dest, frame contains -to- IP datagram MC src: 1-23-F9-CD-06-9 MC dest: 49-D-D2-C IP src: IP dest: IP Eth Phy C-E8-FF CC-49-DE-D0--7D R E6-E F9-CD D-D2-C F F * Check out the online interactive exercises for more examples: Link Layer and LNs 6-13 Link layer, LNs: outline 6.1 introduction, services 6.2 error detection, correction 6.3 multiple access protocols 6.4 LNs addressing, RP Ethernet switches VLNS 6.5 link virtualization: MPLS 6.6 data center networking 6.7 a day in the life of a web request Link Layer and LNs

8 Ethernet dominant wired LN technology: first widely used LN technology simpler, cheap kept up with speed race: 10 Mbps 10 Gbps Metcalfe s Ethernet sketch Link Layer and LNs 6-15 Ethernet: physical topology bus: popular through mid 90s all nodes in same collision domain (can collide with each other) use CSM/CD with binary exponential backoff star: prevails today active switch in center each spoke runs a (separate) Ethernet protocol (nodes do not collide with each other) bus: coaxial cable star switch Link Layer and LNs

9 Ethernet frame structure sending adapter encapsulates IP datagram (or other network layer protocol packet) in Ethernet frame preamble dest. address source address type data (payload) CRC preamble: 7 bytes with pattern followed by one byte with pattern used to synchronize receiver, sender clock rates Link Layer and LNs 6-17 Ethernet frame structure (more) addresses: 6 byte source, destination MC addresses if adapter receives frame with matching destination address, or with broadcast address (e.g. RP packet), it passes data in frame to network layer protocol otherwise, adapter discards frame type: indicates higher layer protocol (mostly IP but others possible, e.g., Novell IPX, ppletalk) CRC: cyclic redundancy check at receiver error detected: frame is dropped preamble dest. address source address type data (payload) CRC Link Layer and LNs

10 Ethernet: unreliable, connectionless connectionless: no handshaking between sending and receiving NICs unreliable: receiving NIC doesn't send CK or NCK to sending NIC data in dropped frames recovered only if initial sender uses higher layer reliable data transfer (e.g., TCP), otherwise dropped data lost Ethernet s MC protocol: unslotted CSM/CD with binary exponential backoff Link Layer and LNs Ethernet standards: link and physical layers many different Ethernet standards common MC protocol and frame format different speeds: 2 Mbps, 10 Mbps, 100 Mbps, 1Gbps, 10 Gbps, 40 Gbps different physical layer media: optical fiber, cable application transport network link physical 100SE-TX 100SE-T4 MC protocol and frame format 100SE-T2 100SE-SX 100SE-FX 100SE-X copper (twister pair) physical layer fiber physical layer Link Layer and LNs

11 Link layer, LNs: outline 6.1 introduction, services 6.2 error detection, correction 6.3 multiple access protocols 6.4 LNs addressing, RP Ethernet switches VLNS 6.5 link virtualization: MPLS 6.6 data center networking 6.7 a day in the life of a web request Link Layer and LNs 6-21 Ethernet switch link-layer device: takes an active role store, forward Ethernet frames examine incoming frame s MC address, selectively forward frame to one-or-more outgoing links when frame is to be forwarded on segment, uses CSM/CD to access segment transparent hosts are unaware of presence of switches plug-and-play, self-learning switches do not need to be configured Link Layer and LNs

12 Switch: multiple simultaneous transmissions hosts have dedicated, direct connection to switch switches buffer packets Ethernet protocol used on each incoming link, but no collisions; full duplex each link is its own collision domain switching: -to- and -to- can transmit simultaneously, without collisions C C 4 3 switch with six interfaces (1,2,3,4,5,6) Link Layer and LNs 6-23 Switch forwarding table Q: how does switch know reachable via interface 4, reachable via interface 5? : each switch has a switch table, each entry: (MC address of host, interface to reach host, time stamp) looks like a routing table! Q: how are entries created, maintained in switch table? something like a routing protocol? C C 4 3 switch with six interfaces (1,2,3,4,5,6) Link Layer and LNs

13 Switch: self-learning Source: Dest: switch learns which hosts can be reached through which interfaces when frame received, switch learns location of sender: incoming LN segment records sender/location pair in switch table C C MC addr interface TS 1 9:32 Switch table (initially empty) Link Layer and LNs 6-25 Switch: frame filtering/forwarding when frame received at switch: 1. record incoming link, MC address of source if entry for source does not exist 2. index switch table using MC destination address 3. if entry found for destination then { if destination on LN segment from which frame arrived then drop frame /* frame filtering */ else forward frame on interface indicated by entry } else flood /* forward on all interfaces except arriving interface */ Link Layer and LNs

14 Self-learning, forwarding: example Source: Dest: frame destination,, location unknown: flood destination location known: selectively send on just one link C C MC addr interface TS 1 9:32 4 9:33 switch table (initially empty) Link Layer and LNs 6-27 Frame filtering Data Link Layer

15 Interconnecting switches self-learning switches can be connected together: S 4 S 1 C S 2 D E F G S 3 H I Q: sending from to G - how does S 1 know to forward frame destined to G via S 4 and S 3? : self learning! (works exactly the same as in single-switch case!) Link Layer and LNs 6-29 Self-learning multi-switch example Suppose C sends frame to I, I responds to C S 4 S 1 C S 2 D E F G S 3 H I Q: show switch tables and packet forwarding in S 1, S 2, S 3, S 4 Link Layer and LNs

16 Institutional network to external network router mail server web server IP subnet Link Layer and LNs 6-31 Switches vs. routers both are store-and-forward: routers: network-layer devices (examine networklayer headers) switches: link-layer devices (examine link-layer headers) datagram frame application transport network link physical switch link physical frame both have forwarding tables: routers: compute tables using routing algorithms, IP addresses switches: learn forwarding table using flooding, learning, MC addresses application transport network link physical network link physical datagram frame Link Layer and LNs

17 Link layer, LNs: outline 6.1 introduction, services 6.2 error detection, correction 6.3 multiple access protocols 6.4 LNs addressing, RP Ethernet switches VLNS 6.5 link virtualization: MPLS 6.6 data center networking 6.7 a day in the life of a web request Link Layer and LNs

CS 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 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 information

CS 3516: Advanced Computer Networks

CS 3516: Advanced Computer Networks Welcome to CS 3516: Advanced Computer Networks Prof. Yanhua Li Time: 9:00am 9:50am M, T, R, and F Location: Fuller 320 Fall 2017 A-term 1 Some slides are originally from the course materials of the textbook

More information

CMPE 150/L : Introduction to Computer Networks. Chen Qian Computer Engineering UCSC Baskin Engineering Lecture 18

CMPE 150/L : Introduction to Computer Networks. Chen Qian Computer Engineering UCSC Baskin Engineering Lecture 18 CMPE 150/L : Introduction to Computer Networks Chen Qian Computer Engineering UCSC Baskin Engineering Lecture 18 1 Final project demo Please do the demo THIS week to the TAs. Or you are allowed to use

More information

Link layer, LANs: outline. Chapter 5-2 Link Layer. MAC addresses (more) MAC addresses

Link 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 information

Link layer: introduction

Link layer: introduction Link layer: introduction terminology: hosts and routers: nodes communication channels that connect adjacent nodes along communication path: links wired links wireless links LANs layer-2 packet: frame,

More information

Chapter 5: The Data Link Layer. Chapter 5 Link Layer and LANs. Ethernet. Link Layer. Star topology. Ethernet Frame Structure.

Chapter 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 information

CSC 4900 Computer Networks: Link Layer (2)

CSC 4900 Computer Networks: Link Layer (2) CSC 4900 Computer Networks: Link Layer (2) Professor Henry Carter Fall 2017 Link Layer 6.1 Introduction and services 6.2 Error detection and correction 6.3 Multiple access protocols 6.4 LANs addressing,

More information

Data 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: 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 information

Lecture 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 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 information

Chapter 4. DataLink Layer. Reference: Computer Networking: A Top Down Approach 4 th edition. Jim Kurose, Keith Ross Addison-Wesley, July 2007.

Chapter 4. DataLink Layer. Reference: Computer Networking: A Top Down Approach 4 th edition. Jim Kurose, Keith Ross Addison-Wesley, July 2007. Chapter 4 DataLink Layer Reference: Computer Networking: A Top Down Approach 4 th edition. Jim Kurose, Keith Ross Addison-Wesley, July 2007. DataLink Layer Link Layer 4.1 Link-Layer Addressing 4.2 Ethernet

More information

Principles behind data link layer services

Principles 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 information

Principles behind data link layer services:

Principles 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 information

Principles behind data link layer services:

Principles 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 information

Principles behind data link layer services:

Principles 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 information

CS 455/555 Intro to Networks and Communications. Link Layer Addressing, Ethernet, and a Day in the Life of a Web Request

CS 455/555 Intro to Networks and Communications. Link Layer Addressing, Ethernet, and a Day in the Life of a Web Request CS 455/555 Intro to Networks and Communications Link Layer Addressing, ernet, and a Day in the Life of a Web Request Dr. Michele Weigle Department of Computer Science Old Dominion University mweigle@cs.odu.edu

More information

Summary of MAC protocols

Summary 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 information

Lecture 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 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 information

Lecture 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 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 information

Adaptors Communicating. Link Layer: Introduction. Parity Checking. Error Detection. Multiple Access Links and Protocols

Adaptors 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 information

Chapter 5 Link Layer. Computer Networking: A Top Down Approach. 6 th edition Jim Kurose, Keith Ross Addison-Wesley March 2012

Chapter 5 Link Layer. Computer Networking: A Top Down Approach. 6 th edition Jim Kurose, Keith Ross Addison-Wesley March 2012 Chapter 5 Link Layer Computer Networking: A Top Down Approach 6 th edition Jim Kurose, Keith Ross Addison-Wesley March 2012 All material copyright 1996-2012 J.F Kurose and K.W. Ross, All Rights Reserved

More information

Adaptors Communicating. Link Layer: Introduction. Parity Checking. Error Detection. Multiple Access Links and Protocols

Adaptors 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 information

Lecture 9 Ethernet and other Link Layer protocols

Lecture 9 Ethernet and other Link Layer protocols Lecture 9 Ethernet and other Link Layer protocols From Kurose & Ross Book slightly modified by Romaric Duvignau duvignau@chalmers.se Thanks and enjoy! JFK/KWR All material copyright 1996-2016 J.F Kurose

More information

Chapter 6 The Link Layer and LANs

Chapter 6 The Link Layer and LANs Chapter 6 The Link Layer and LANs A note on the use of these Powerpoint slides: We re making these slides freely available to all (faculty, students, readers). They re in PowerPoint form so you see the

More information

Chapter 5 Link Layer. Down Approach. Computer Networking: A Top. 6 th edition Jim Kurose, Keith Ross Addison-Wesley March 2012

Chapter 5 Link Layer. Down Approach. Computer Networking: A Top. 6 th edition Jim Kurose, Keith Ross Addison-Wesley March 2012 Chapter 5 Link Layer Computer Networking: A Top Down Approach 6 th edition Jim Kurose, Keith Ross Addison-Wesley March 2012 Slides adopted from original ones provided by the textbook authors. Link layer,

More information

Medium Access Protocols

Medium 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 information

Link Layer: Introduction. Chapter 5 Link Layer & LANS. Link layer: context. Link Layer Services

Link 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 information

Link Layer: Introduction. Chapter 5 Link Layer & LANS. Link layer: context. Link Layer Services

Link 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 information

Master Course Computer Networks IN2097

Master 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 information

Links. Error Detection. Link Layer. Multiple access protocols. Nodes Links Frame. Shared channel Problem: collisions How nodes share a channel

Links. 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 information

Chapter 5 Link Layer. Computer Networking: A Top Down Approach. 6 th edition Jim Kurose, Keith Ross Addison-Wesley March 2012

Chapter 5 Link Layer. Computer Networking: A Top Down Approach. 6 th edition Jim Kurose, Keith Ross Addison-Wesley March 2012 Chapter 5 Link Layer Computer Networking: A Top Down Approach 6 th edition Jim Kurose, Keith Ross Addison-Wesley March 2012 All material copyright 1996-2012 J.F Kurose and K.W. Ross, All Rights Reserved

More information

Chapter V: Link Layer

Chapter V: Link Layer Chapter V: Link Layer UG3 Computer Communications & Networks (COMN) Myungjin Lee myungjin.lee@ed.ac.uk Slides copyright of Kurose and Ross Link layer services framing, link access: encapsulate datagram

More information

INTRODUCTION, SERVICES. Data-link layer has responsibility of transferring datagram from one node to physically adjacent node over a link

INTRODUCTION, SERVICES. Data-link layer has responsibility of transferring datagram from one node to physically adjacent node over a link LINK LAYER 1 GOALS Understand principles behind link layer services: error detection, correction link layer addressing local area networks: Ethernet, VLANs, and data center networks 2 INTRODUCTION, SERVICES

More information

Broadcast Links, Addressing and Media Access Control. Link Layer B. Link and Physical Layers. MAC Addresses

Broadcast 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 information

Link Layer and LANs. CMPS 4750/6750: Computer Networks

Link Layer and LANs. CMPS 4750/6750: Computer Networks Link Layer and LANs CMPS 4750/6750: Computer Networks 1 Outline overview (6.1) multiple access (6.3) link addressing: ARP (6.4.1) a day in the life of a web request (6.7) 2 Link layer: introduction terminology:

More information

CSCD 330 Network Programming Spring 2017

CSCD 330 Network Programming Spring 2017 CSCD 330 Network Programming Spring 2017 Lecture 18 Link Layer Protocols Continued Who is this? Reading: Chapter 5 Some slides provided courtesy of J.F Kurose and K.W. Ross, All Rights Reserved, copyright

More information

LINK LAYER AND LANS 1

LINK LAYER AND LANS 1 LINK LAYER AND LANS 1 GOALS Understand principles behind link layer services: error detection, correction link layer addressing local area networks: Ethernet, VLANs, and data center networks Instantiation,

More information

Announcements. CS 5565 Network Architecture and Protocols. Ethernet. Ethernet. Ethernet Model. Ideal Multiple Access Protocol

Announcements. 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 information

Computer Networks. Today. Principles of datalink layer services Multiple access links Adresavimas, ARP LANs Wireless LANs VU MIF CS 1/48 2/48

Computer 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 information

Link Layer: CSMA/CD, MAC addresses, ARP

Link Layer: CSMA/CD, MAC addresses, ARP Link Layer: CSM/CD, MC addresses, RP Smith College, CSC 249 March 29, 208 MC ddress q 32-bit IP address: network-layer address used to get datagram to destination IP subnet q MC (or LN, physical, thernet,

More information

Chapter 5 Data Link Layer

Chapter 5 Data Link Layer Chapter 5 Data Link Layer Reti degli Elaboratori Canale AL Prof.ssa Chiara Petrioli a.a. 2013/2014 We thank for the support material Prof. Kurose-Ross All material copyright 1996-2012 J.F Kurose and K.W.

More information

Chapter 5 Link Layer and LANs

Chapter 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 information

Chapter V: Link Layer

Chapter V: Link Layer Chapter V: Link Layer UG3 Computer Communications & Networks (COMN) Myungjin Lee myungjin.lee@ed.ac.uk Slides copyright of Kurose and Ross Link layer: introduction terminology: hosts and routers: nodes

More information

CSEN 503 Introduction to Communication Networks. Mervat AbuElkheir Hana Medhat Ayman Dayf. **Slides are attributed to J. F. Kurose

CSEN 503 Introduction to Communication Networks. Mervat AbuElkheir Hana Medhat Ayman Dayf. **Slides are attributed to J. F. Kurose CSEN 503 Introduction to Communication Networks Mervat AbuElkheir Hana Medhat Ayman Dayf **Slides are attributed to J. F. Kurose 1-2 Link Layer Link Layer: Introduction Some terminology: hosts and routers

More information

Review. Error Detection: CRC Multiple access protocols. LAN addresses and ARP Ethernet. Slotted ALOHA CSMA/CD

Review. 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 information

Lecture 6. Data Link Layer (cont d) Data Link Layer 1-1

Lecture 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 information

Master Course Computer Networks IN2097

Master 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. Chair for

More information

CSCD 330 Network Programming Winter 2016

CSCD 330 Network Programming Winter 2016 CSCD 330 Network Programming Winter 2016 Lecture 18 Link Layer Protocols Continued Who is this? Reading: Chapter 5 Some slides provided courtesy of J.F Kurose and K.W. Ross, All Rights Reserved, copyright

More information

Hubs. twisted pair. hub. 5: DataLink Layer 5-1

Hubs. twisted pair. hub. 5: DataLink Layer 5-1 Hubs Hubs are essentially physical-layer repeaters: bits coming from one link go out all other links at the same rate no frame buffering no CSMA/CD at : adapters detect collisions provides net management

More information

Chapter 5 Data Link Layer

Chapter 5 Data Link Layer Chapter 5 Data Link Layer Reti di Elaboratori Corso di Laurea in Informatica Università degli Studi di Roma La Sapienza Canale A-L Prof.ssa Chiara Petrioli Parte di queste slide sono state prese dal materiale

More information

Chapter 6 The Link Layer and LANs

Chapter 6 The Link Layer and LANs Chapter 6 The Link Layer and LANs A note on the use of these Powerpoint slides: We re making these slides freely available to all (faculty, students, readers). They re in PowerPoint form so you see the

More information

Module 10 Data Link Layer CS655! 10-1!

Module 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 information

Chapter 5 Link Layer. Computer Networking: A Top Down Approach. 6 th edition Jim Kurose, Keith Ross Addison-Wesley March 2012

Chapter 5 Link Layer. Computer Networking: A Top Down Approach. 6 th edition Jim Kurose, Keith Ross Addison-Wesley March 2012 Chapter 5 Link Layer 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 see the animations; and can

More information

Chapter 5 Link Layer. Computer Networking: A Top Down Approach. 6 th edition Jim Kurose, Keith Ross Addison-Wesley March 2012

Chapter 5 Link Layer. Computer Networking: A Top Down Approach. 6 th edition Jim Kurose, Keith Ross Addison-Wesley March 2012 Chapter 5 Link Layer 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 see the animations; and can

More information

Chapter 5 Link Layer and LANs

Chapter 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 information

Chapter 6 The Link Layer and LANs

Chapter 6 The Link Layer and LANs Chapter 6 The Link Layer and LANs A note on the use of these Powerpoint slides: We re making these slides freely available to all (faculty, students, readers). They re in PowerPoint form so you see the

More information

Chapter 6 The Data Link layer

Chapter 6 The Data Link layer Chapter 6 The Data Link layer 6.1 introduction, services 6.2 error detection, correction 6.3 multiple access protocols 6.4 LANs addressing, ARP Ethernet layer-2 switches VLANS 6.5 link virtualization:

More information

Chapter 5: The Data Link Layer

Chapter 5: The Data Link Layer Chapter 5: The Data Link Layer Our goals: principles behind data link layer services: error detection, correction sharing a broadcast channel: multiple access link layer addressing reliable data transfer,

More information

CSC 401 Data and Computer Communications Networks

CSC 401 Data and Computer Communications Networks CSC 401 Data and Computer Communications Networks Link Layer, Switches, VLANS, MPLS, Data Centers Sec 6.4 to 6.7 Prof. Lina Battestilli Fall 2017 Chapter 6 Outline Link layer and LANs: 6.1 introduction,

More information

Chapter 5: Link layer

Chapter 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 information

Chapter 5 Link Layer. Link Layer 5-1

Chapter 5 Link Layer. Link Layer 5-1 Chapter 5 Link Layer Link Layer 5-1 Link layer: introduction terminology: hosts and routers: nodes communication channels that connect adjacent nodes along communication path: links wired links wireless

More information

Lecture 20: Link Layer

Lecture 20: Link Layer Lecture 20: Link Layer COMP 332, Spring 2018 Victoria Manfredi Acknowledgements: materials adapted from Computer Networking: A Top Down Approach 7 th edition: 1996-2016, J.F Kurose and K.W. Ross, All Rights

More information

Link Layer: Introduction. Chapter 5 Link Layer & LANS. Link layer: context. Link Layer Services

Link Layer: Introduction. Chapter 5 Link Layer & LANS. Link layer: context. Link Layer Services Chapter 5 Link Layer & LANS 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 information

Chapter 5 part 2 LINK LAYER. Computer Networks Timothy Roscoe Summer Networks & Operating Systems Computer Networks

Chapter 5 part 2 LINK LAYER. Computer Networks Timothy Roscoe Summer Networks & Operating Systems Computer Networks Chapter 5 part 2 LINK LAYER Computer Networks Timothy Roscoe Summer 2007 LAN technologies Data link layer so far services, error detection/correction, multiple access Next: LAN technologies LAN addressing,

More information

Chapter 6 The Link Layer and LANs

Chapter 6 The Link Layer and LANs Chapter 6 The Link Layer and LANs Andrei Gurtov TDTS04/TDTS11/TDDD93 All material copyright 1996-2016 J.F Kurose and K.W. Ross, All Rights Reserved Computer Networking: A Top Down Approach 7 th edition

More information

Chapter 6 The Link Layer and LANs

Chapter 6 The Link Layer and LANs Chapter 6 The Link Layer and LANs Andrei Gurtov All material copyright 1996-2016 J.F Kurose and K.W. Ross, All Rights Reserved Computer Networking: A Top Down Approach 7 th edition Jim Kurose, Keith Ross

More information

Chapter 5: DataLink Layer

Chapter 5: DataLink Layer Chapter 5: DataLink Layer Course on Computer Communication and Networks, CTH/GU The slides are adaptation of the slides made available by the authors of the course s main textbook Slides with darker background

More information

Module 4 Data Link Layer CS655! 4-1!

Module 4 Data Link Layer CS655! 4-1! Module 4 Data Link Layer CS655! 4-1! 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 available

More information

Chapter 6 The Link Layer and LANs. Chapter 6: Link layer and LANs. Link layer, LANs: outline

Chapter 6 The Link Layer and LANs. Chapter 6: Link layer and LANs. Link layer, LANs: outline Chapter 6 The Link Layer and LNs note on the use of these Powerpoint slides: We re making these slides freely available to all (faculty, students, readers). They re in PowerPoint form so you see the animations;

More information

ECE 4450:427/527 - Computer Networks Spring 2017

ECE 4450:427/527 - Computer Networks Spring 2017 ECE 4450:427/527 - Computer Networks Spring 2017 Dr. Nghi Tran Department of Electrical & Computer Engineering Lecture 6.2: IP Dr. Nghi Tran (ECE-University of Akron) ECE 4450:427/527 Computer Networks

More information

Link Layer and LANs. Our Goals. Link Layer

Link 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 information

Discussions. What are the main service. Ch06 Link Layer. The Data Link Layer. Link Layer. Link Layer: Teminology. What are the services

Discussions. 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 information

Chapter 6 The Link Layer and LANs

Chapter 6 The Link Layer and LANs Chapter 6 The Link Layer and LANs A note on the use of these Powerpoint slides: We re making these slides freely available to all (faculty, students, readers). They re in PowerPoint form so you see the

More information

Chapter 6 The Link Layer and LANs

Chapter 6 The Link Layer and LANs Chapter 6 The Link Layer and LANs A note on the use of these Powerpoint slides: We re making these slides freely available to all (faculty, students, readers). They re in PowerPoint form so you see the

More information

CSCD 330 Network Programming Winter Lecture 17b Link Layer Protocols Who is this? Reading: Chapter 5

CSCD 330 Network Programming Winter Lecture 17b Link Layer Protocols Who is this? Reading: Chapter 5 CSCD 330 Network Programming Winter 2014 Lecture 17b Link Layer Protocols Who is this? Reading: Chapter 5 Some slides provided courtesy of J.F Kurose and K.W. Ross, All Rights Reserved, copyright 1996-2007

More information

Link Layer and Ethernet

Link 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 information

CSCI Computer Networks Fall 2016

CSCI Computer Networks Fall 2016 source: computer-networks-webdesign.com CSCI 4760 - Computer Networks Fall 2016 Instructor: Prof. Roberto Perdisci perdisci@cs.uga.edu These slides are adapted from the textbook slides by J.F. Kurose and

More information

Computer Network Fundamentals Spring Week 3 MAC Layer Andreas Terzis

Computer 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 information

Links Reading: Chapter 2. Goals of Todayʼs Lecture. Message, Segment, Packet, and Frame

Links 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 information

Link Layer and Ethernet

Link 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 information

CSCI Computer Networks Spring 2017

CSCI Computer Networks Spring 2017 source: computer-networks-webdesign.com CSCI 6760 - Computer Networks Spring 2017 Instructor: Prof. Roberto Perdisci perdisci@cs.uga.edu These slides are adapted from the textbook slides by J.F. Kurose

More information

Communication Networks ( ) / Spring 2011 The Blavatnik School of Computer Science, Tel-Aviv University. Allon Wagner

Communication 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 information

Topic 2a. Ch 6: The Link Layer and LANs. Computer Networking: A Top Down Approach

Topic 2a. Ch 6: The Link Layer and LANs. Computer Networking: A Top Down Approach Topic 2a Ch 6: The Link Layer and LANs Computer Networking: A Top Down Approach 7 th edition Jim Kurose, Keith Ross Pearson/Addison Wesley April 2016 6-1 Chapter 6: Link layer and LANs our goals: understand

More information

ECE 4450:427/527 - Computer Networks Spring 2017

ECE 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 information

Chapter 6 The Link Layer and LANs

Chapter 6 The Link Layer and LANs Chapter 6 The Link Layer and LANs Chapter 6: Link layer and LANs our goals: understand principles behind link layer services: error detection, correction sharing a broadcast channel: multiple access link

More information

Chapter 6 The Data Link layer

Chapter 6 The Data Link layer Chapter 6 The Data Link layer 6.1 introduction, services 6.2 error detection, correction 63 6.3 multiple lil access protocols 64LAN 6.4 LANs addressing, ARP Ethernet layer-2 switches VLANS 6.5 link virtualization:

More information

Objectives. Hexadecimal Numbering and Addressing. Ethernet / IEEE LAN Technology. Ethernet

Objectives. 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 information

CS/ECE 438: Communication Networks Fall Link Layer

CS/ECE 438: Communication Networks Fall Link Layer CS/ECE 438: Communication Networks Fall 2017 5. Link Layer 1 Chapter 5: Link Layer application transport network link physical 2 Chapter 6: Link layer and LANs our goals: understand principles behind link

More information

Chapter 6 The Link Layer and LANs

Chapter 6 The Link Layer and LANs Chapter 6 The Link Layer and LANs A note on the use of these Powerpoint slides: We re making these slides freely available to all (faculty, students, readers). They re in PowerPoint form so you see the

More information

Chapter 6 The Link Layer and LANs

Chapter 6 The Link Layer and LANs Chapter 6 The Link Layer and LANs A note on the use of these Powerpoint slides: We re making these slides freely available to all (faculty, students, readers). They re in PowerPoint form so you see the

More information

Lecture 6 - Link layer. Lecture 5 Review. Link Layer. Introduction, Services. Notes. Notes. Notes. Notes. Networks and Security. Jacob Aae Mikkelsen

Lecture 6 - Link layer. Lecture 5 Review. Link Layer. Introduction, Services. Notes. Notes. Notes. Notes. Networks and Security. Jacob Aae Mikkelsen Lecture 6 - Link layer Networks and Security Jacob Aae Mikkelsen IMADA October 21, 2013 October 21, 2013 1 / 91 Lecture 5 Review Explain in short the following abbreviations, and the concept behind it.

More information

Architettura di Reti

Architettura di Reti Università di Ferrara Architettura di Reti Chapter 6: Carlo Giannelli carlo.giannelli@unife.it http://www.unife.it/scienze/informatica/insegnamenti/architettura-reti/ http://docente.unife.it/carlo.giannelli

More information

CSC 8560 Computer Networks: Link Layer

CSC 8560 Computer Networks: Link Layer CSC 8560 Computer Networks: Link Layer Professor Henry Carter Fall 2017 Last Time We talked about intra-as routing protocols: Which routing algorithm is used in RIP? OSPF? What techniques allow OSPF to

More information

Chapter 6: Link layer and LANs. Link layer, LANs: outline. Link layer: introduction. Link layer: context. Link layer services (more)

Chapter 6: Link layer and LANs. Link layer, LANs: outline. Link layer: introduction. Link layer: context. Link layer services (more) Chapter 6: Link layer and LANs our goals: understand principles behind layer services: error detection, sharing a broadcast channel: multiple access layer addressing local area networks: ernet, VLANs instantiation,

More information

CC451 Computer Networks

CC451 Computer Networks CC451 Computer Networks Lecture 9 Link Layer 5: DataLink Layer 5-1 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,

More information

Chapter 6 The Link Layer and LANs

Chapter 6 The Link Layer and LANs Chapter 6 The Link Layer and LANs A note on the use of these Powerpoint slides: We re making these slides freely available to all (faculty, students, readers). They re in PowerPoint form so you see the

More information

Computer Communication Networks Link

Computer Communication Networks Link Computer Communication Networks Link ICEN/ICSI 416 Fall 2017 Prof. Dola Saha 1 Link layer and LANs our goals: understand principles behind link layer services: error detection, correction sharing a broadcast

More information

Chapter 5 Link Layer. Computer Networking: A Top Down Approach. 6 th edition Jim Kurose, Keith Ross Addison-Wesley March 2012

Chapter 5 Link Layer. Computer Networking: A Top Down Approach. 6 th edition Jim Kurose, Keith Ross Addison-Wesley March 2012 Chapter 5 Link Layer 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 see the animations; and can

More information

Chapter 5 Link Layer. Computer Networking: A Top Down Approach. 6 th edition Jim Kurose, Keith Ross Addison-Wesley March 2012

Chapter 5 Link Layer. Computer Networking: A Top Down Approach. 6 th edition Jim Kurose, Keith Ross Addison-Wesley March 2012 Chapter 5 Link Layer 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 see the animations; and can

More information

Chapter 5: Link layer

Chapter 5: Link layer Chapter 5: Link layer our goals: understand principles behind link layer services: error detection, correction sharing a broadcast channel: multiple access link layer addressing local area networks: Ethernet,

More information

Chapter 5 Link Layer and LANs

Chapter 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 information