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CMU CS 15213 - Lecture

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Internetworking May 1, 2001Typical computer systemGeneric networkProtocolsProtocol layeringEncapsulationBasic network typesThe internetworking idea (Kahn, 1972)Internetworking challengesInternetworking with repeatersSlide 11Internetworking with repeaters: Pros and consInternetworking with bridgesSlide 14Internetworking with bridges: Pros and consInternetworking with routersBuilding an internetBuilding an internet (cont)Slide 19Slide 20Slide 21IP: Internetworking with routersInternet protocol stackIP service modelIP datagram delivery: Example internetIP layeringBasic Internet componentsThe Internet circa 1993The Internet backbone (circa 1993)Current NAP-based Internet architectureInternet connection hierarchyNetwork access points (NAPs)PowerPoint PresentationInternetworking May 1, 2001 Topics•Protocol layering and encapsulation•Internetworking with hubs, bridges, and routers•The Internet Protocol (IP)•The global Internetclass30.ppt15-213“The course that gives CMU its Zip!”CS 213 S’01– 2 –class30.pptTypical computer systemLocal/IO BusLocal/IO BusMemoryMemoryNetworkadapterNetworkadapterIDE diskcontrollerIDE diskcontrollerVideoadapterVideoadapterDisplayDisplayNetworkNetworkProcessorProcessorInterruptcontrollerInterruptcontrollerSCSIcontrollerSCSIcontrollerSCSI busSCSI busSerial port controllerSerial port controllerParallel portcontrollerParallel portcontrollerKeyboardcontrollerKeyboardcontrollerKeyboardKeyboardMouseMousePrinterPrinterModemModemdiskdisk cdromCS 213 S’01– 3 –class30.pptGeneric networkInterconnect (wires, repeaters, bridges, and routers)Interconnect (wires, repeaters, bridges, and routers)softwaresoftwarehardwarehardwaresoftwaresoftwarehardwarehardwarelink link linkhost hostprotocol stacknetwork adapter/interface cardOS codesoftwaresoftwarehardwarehardwareCS 213 S’01– 4 –class30.pptProtocolsA protocol defines the format of packets and the rules for communicating them across the network.Different protocols provide different levels of service:•simple error correction (ethernet)•uniform name space, unreliable best-effort datagrams (host-host) (IP)•reliable byte streams (TCP)•unreliable best-effort datagrams (process-process) (UDP)•multimedia data retrieval (HTTP)Crucial idea: protocols leverage off of the capabilities of other protocols.CS 213 S’01– 5 –class30.pptProtocol layeringProtocols provide specialized services by relying on services provided by lower-level protocols (i.e., they leverage lower-level services).Reliable byte streamdelivery(process-process)Unreliablebest effort datagramdelivery(host-host)Unreliablebest effortdatagramdelivery(process-process)User application program (FTP, Telnet, WWW, email)User application program (FTP, Telnet, WWW, email)User datagram protocol(UDP)User datagram protocol(UDP)Transmission control protocol (TCP)Transmission control protocol (TCP)Internet Protocol (IP)Internet Protocol (IP)Network interface (ethernet)Network interface (ethernet)hardwarehardwarePhysical connectioninterface between user code and OS code(Sockets interface)CS 213 S’01– 6 –class30.pptEncapsulationTCP segment headerTCP segment headerdatadatadatadataEthernet frameheaderEthernet frameheaderIP datagramheaderIP datagramheaderTCP segment headerTCP segment headerdatadataIP datagramheaderIP datagramheaderTCP segment headerTCP segment headerdatadataApplication programTCPIPAdapterNetworkOS codeUser codeUser Interface (API)OS/adapter interface(exception mechanism)Adapter/Network interfaceCS 213 S’01– 7 –class30.pptBasic network typesSystem area network (SAN)•same room (meters) •300 MB/s Cray T3ELocal area network (LAN)•same bldg or campus (kilometers) •10 Mb/sEthernet•100 Mb/s Fast Ethernet•100 Mb/s FDDI•150 Mb/s OC-3 ATM•622 Mb/s OC-12 ATMMetropolitan area network (MAN)•same city (10’s of kilometers)•800 Mb/s Gigabit NectarWide area network (WAN)•nationwide or worldwide (1000’s of kilometers) •telephone system•1.544 Mb/s T1 carrier•44.736 Mb/s T3 carrier•Global InternetCS 213 S’01– 8 –class30.pptThe internetworking idea (Kahn, 1972)Build a single network (an interconnected set of networks, or internetwork, or internet) out of a large collection of separate networks.•Each network must stand on its own, with no internal changes allowed to connect to the internet.•Communications should be on a best-effort basis.•“black boxes” (later called routers) should be used to connect the networks.•No global control at the operations level.CS 213 S’01– 9 –class30.pptInternetworking challengesChallenges:•heterogeneity–lots of different kinds of networks (Ethernet, FDDI, ATM, wireless, point-to-point)–how to unify this hodgepodge?•scale–how to provide uniques names for potentially billions of nodes? (naming)–how to find all these nodes? (forwarding and routing)Note: internet refers to a general idea, Internet refers to a particular implementation of that idea (The global IP Internet).CS 213 S’01– 10 –class30.pptInternetworking with repeatersrrrrRepeaters (also called hubs)(r in the figure) directly transfer bits from their inputs to their outputsCS 213 S’01– 11 –class30.pptInternetworking with repeatersHost on network AHost on network BTelnet, FTP, HTTP, emailapplicationtransportnetworkdata linkphysicalapplicationtransportnetworkdata link10Base-TphysicalRepeater(forwards bits)CS 213 S’01– 12 –class30.pptInternetworking with repeaters:Pros and consPros•Transparency–LANS can be connected without any awareness from the hosts.•Useful for serving multiple machines in an office from one ethernet outlet.Cons•Not scalable–ethernet standard allows only 4 repeaters.–more than 4 would introduce delays that would break contention detection.•No heterogeneity–Networks connected with repeaters must have identical electrical properties.CS 213 S’01– 13 –class30.pptInternetworking with bridgesbbbbBridges (b In the figure) maintain a cache of hosts on their input segments.Selectively transferethernet frames from their inputs to their outputs.CS 213 S’01– 14 –class30.pptInternetworking with bridgesHost on network AHost on network BTelnet, FTP, HTTP, emailapplicationtransportnetworkdata linkphysicalapplicationtransportnetworkdata linkCSMA/CD10Base-TphysicalBridge(forwards ethernetframes)CS 213 S’01– 15 –class30.pptInternetworking with bridges:Pros and consPros•Transparency–LANS can be connected without any awareness from


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