lecture10 - CS4700/CS5700 Fundamentals of Computer Networks...

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Alan Mislove amislove at ccs.neu.edu Northeastern University 1 CS4700/CS5700 Fundamentals of Computer Networks Lecture 10: Internet Protocol (IP) Slides used with permissions from Edward W. Knightly, T. S. Eugene Ng, Ion Stoica, Hui Zhang
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Alan Mislove amislove at ccs.neu.edu Northeastern University 2 Recap Cannot build a global network such as the Internet using Ethernet bridges Problem 1: Addressing Problem 2: Routing Additionally, a global network should allow heterogeneous technologies (e.g. ATM, circuit-switched networks, Ethernet, etc)
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Alan Mislove amislove at ccs.neu.edu Northeastern University 3 New Word: Internetwork Multiple incompatible LANs can be physically connected by specialized computers called routers . The connected networks are called an internetwork . – The “ Internet ” is one (very big & successful) example of an internetwork host host host LAN 1 ... host host host LAN 2 ... router router router WAN WAN LAN 1 and LAN 2 might be completely different, totally incompatible LANs (e.g., Ethernet, Wi-Fi, ATM, Circuit-switched)
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Alan Mislove amislove at ccs.neu.edu Northeastern University 4 Logical Structure of Internet – Ad hoc interconnection of networks • No particular topology – Send packets from source to destination by hopping through networks • Router connects one network to another • Different packets may take different routes host host router router router router router router Ethernet Hosts, bridges, switches, hubs, etc ATM Wi-Fi
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Alan Mislove amislove at ccs.neu.edu Northeastern University 4 Logical Structure of Internet – Ad hoc interconnection of networks • No particular topology – Send packets from source to destination by hopping through networks • Router connects one network to another • Different packets may take different routes host host router router router router router router Ethernet Hosts, bridges, switches, hubs, etc ATM Wi-Fi
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Alan Mislove amislove at ccs.neu.edu Northeastern University 4 Logical Structure of Internet – Ad hoc interconnection of networks • No particular topology – Send packets from source to destination by hopping through networks • Router connects one network to another • Different packets may take different routes host host router router router router router router Ethernet Hosts, bridges, switches, hubs, etc ATM Wi-Fi
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Alan Mislove amislove at ccs.neu.edu Northeastern University 5 Adding an Internetwork Layer (IP) for Interoperability FTP TCP IP Ethernet Ethernet ATM IP FTP TCP IP ATM Router Host Bridge ATM Switch Host
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Alan Mislove amislove at ccs.neu.edu Northeastern University 6 Issues in Designing an Internetwork How do I designate a distant host? – Addressing / naming
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lecture10 - CS4700/CS5700 Fundamentals of Computer Networks...

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