Data Communications And Networking Overview
Data CommunicationsandNetworking OverviewRaj JainWashington UniversitySaint Louis, MO 63131Jain@cse.wustl.eduThese slides are available on-line at:http://www.cse.wustl.edu/ jain/cse473-05/Washington University in St. LouisCSE473s2-1 2005 Raj Jain
OverviewData Comm vs Networking vs Distributed Systems! Communications Tasks! Types of Networks! Protocol Layers! ISO/OSI Reference Model! TCP/IP Reference Model!Washington University in St. LouisCSE473s2-2 2005 Raj Jain
Data Communication vs Networking!Communication: Two Nodes. Mostly EE issues.!Networking: Two or more nodes. More issues, e.g.,routingWashington University in St. LouisCSE473s2-3 2005 Raj Jain
Distributed Systems vs NetworksDistributed Systems:! Users are unaware of underlying structure.E.g., trn instead of \n\bone\0\trn! Mostly operating systems issues.! Nodes are generally under one organization’scontrol.! Networks: Users specify the location of resources.http:\\www.cse.wustl.edu\ jain\! Nodes are autonomous.!ServerServerWashington University in St. LouisCSE473s2-4 2005 Raj Jain
Simplified Communications Model!Transmitter: encodes the informationWashington University in St. LouisCSE473s2-5 2005 Raj Jain
Data Communications: Example!Modem is used to transmit/receive digital informationover analog phone systemWashington University in St. LouisCSE473s2-6 2005 Raj Jain
Communications Tasks!!!!!!!!!!!!!Transmission System Utilization (Multiplexing)InterfacingSignal generation (Coding)Synchronization between transmitter and receiverExchange management (Connection Management)Error detection and correctionFlow controlAddressingRoutingRecoveryMessage formattingSecurityNetwork ManagementWashington University in St. LouisCSE473s2-7 2005 Raj Jain
Types of Networks!Point to point vs BroadcastWANBus LAN!RingLANCircuit switched vs packet switchedWashington University in St. LouisCSE473s2-8 2005 Raj Jain
Types of Networks (Cont)!!!Enterprise vs Telecom NetworksEthernet is the most common interface in EnterpriseFrame relay and ATM are common in Telecom NetworksLocal Area Networks (LAN) 0-2 km, Single OwnershipMetropolitan Area Networks (MAN) 2-50 km,Wide Area Networks (WAN) 50 kmTelecom Networks:! Access: Between subscriber and the service provider! Metro: Covering a city! Core: Between citiesWashington University in St. LouisCSE473s2-9 2005 Raj Jain
An Example ConfigurationWashington University in St. LouisCSE473s2-10 2005 Raj Jain
Protocol Layers!Problem: Philosophers in different countries speakdifferent languages. The Telex system works onlywith English. I believe there is a God!PhilosopherTranslatorSecretaryWashington University in St. LouisCSE473s2-11 2005 Raj Jain
A Sample Protocol ArchitectureWashington University in St. LouisCSE473s2-12 2005 Raj Jain
ISO/OSI Reference workDatalinkPhysicalWashington University in St. LouisFile transfer, Email, Remote LoginASCII Text, SoundEstablish/manage connectionEnd-to-end communication: TCPRouting, Addressing: IPTwo party communication: EthernetHow to transmit signal: CodingCSE473s2-13 2005 Raj Jain
Service and Protocol Data UnitsApplication 1Application 2Application 1Application sService Access Points (SAPs)! Service Data Units (SDUs)! Protocol Data Units (PDUs)!Washington University in St. LouisCSE473s2-14 2005 Raj Jain
Service Data Unit on University in St. LouisCSE473s2-15 2005 Raj Jain
Protocol Data Unit kDatalinkPhysicalWashington University in St. LouisAPDU, MessagePPDUSPDUTPDUNPDU, PacketDPDU, FramePhPDU, sportNetworkDatalinkPhysical 2005 Raj Jain
Use of a RelayWashington University in St. LouisCSE473s2-17 2005 Raj Jain
Service Primitives!Indication InterruptHigher Layer1Higher Layer43Lower Layer1. Request2. Indication2Lower Layer3. Response4. ConfirmUnconfirmed service: No confirmation or responseWashington University in St. LouisCSE473s2-18 2005 Raj Jain
TCP/IP Reference ModelTCP Transport Control Protocol! IP Internet Protocol (Routing)!TCP/IP Ref ModelApplicationTransportTCP/IP ProtocolsFTPTelnet HTTPTCPUDPInternetworkIPHost toNetworkEther Point-to- PacketnetPoint RadioPhysicalCoax Fiber WirelessWashington University in St. LouisCSE473s2-19 2005 Raj Jain
OSI vs TCP/IPWashington University in St. LouisCSE473s2-20 2005 Raj Jain
OSI vs TCP Reference ModelsOSI introduced concept of services, interface,protocols. These were force-fitted to TCP later It is not easy to replace protocols in TCP.! In OSI, reference model was done before protocols.In TCP, protocols were done before the model! OSI: Standardize first, build laterTCP: Build first, standardize later! OSI took too long to standardize.TCP/IP was already in wide use by the time.! OSI became too complex.! TCP/IP is not general. Ad hoc.!Washington University in St. LouisCSE473s2-21 2005 Raj Jain
TCP/IP ConceptsSub!SubNetwork Attachment Point (NAP)Washington University in St. LouisCSE473s2-22 2005 Raj Jain
PDUs in TCP/IP ArchitectureSubSubWashington University in St. LouisCSE473s2-23 2005 Raj Jain
TCP/IP ApplicationsWashington University in St. LouisCSE473s2-24 2005 Raj Jain
SummaryCommunication, Networks, and Distributed systems! ISO/OSI’s 7-layer reference model! TCP/IP has a 5-layer model! PDU, SDU, SAP! Request, Indication, Response, Confirmation!Washington University in St. LouisCSE473s2-25 2005 Raj Jain
Reading AssignmentRead Chapters 0, 1, and 2 of Stallings 7th EditionAppendix 2A can be skipped at this time! 0.2 Internet and Web Resources! 0.3 Standards! Visit some of the web sites mentioned in 0.2 and 0.3!Washington University in St. LouisCSE473s2-26 2005 Raj Jain
HomeworkVisit www.ietf.org and find the titles of RFC 1 andRFC 780! Submit answers to Problems 2.2 and 2.7 of Stallings7th Edition! Problem 2.2: Communications between France andChina! Problem 2.7: Segmentation and Blocking!Washington University in St. LouisCSE473s2-27 2005 Raj Jain
Data Communications and Networking Overview, Overview, Data Communication vs Networking, Distributed Systems vs Networks, Simplified Communications Model, Data Communications: Example, Communications Tasks, Types of Networks, An Example Configuration, Protocol Layers, A Sample Protocol Architecture,
Dell EMC Networking S4148F-ON 2.2 Dell EMC Networking S4248FB-ON The Dell EMC Networking S4248FB-ON is a 1-RU, multilayer switch with forty 10GbE ports, two 40GbE ports, and six 10/25/40/50/100GbE ports. Two S4248FB-ON switches are used as leaf switches in the examples in this guide. Dell EMC Networking S4248FB-ON 2.3 Dell EMC Networking Z9100-ON
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