L20-Internet-2009 - 1 Packet Packet-Switched Networks...

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Unformatted text preview: 1 Packet Packet-Switched Networks Switched Networks and the Internet and the Internet Trac D. Tran ECE Department The Johns Hopkins University Baltimore, MD 21218 Outline Outline Internet: an overview Circuit-switching networks Packet-switching networks Inside a packet Advantages in sharing resources Error-resilience issues: delay & loss Transmission protocols 2 Internet Internet Millions of connected computing devices Hardware Servers, routers, workstations, mobile terminals Routers: forward data packets to their destinations Communication links fiber, copper, radio, satellite Software Distributed applications web surfing, streaming Protocols Control the sending and receiving of messages local ISP company network regional ISP router workstation server mobile Network Structure Network Structure Network edge End systems or hosts (clients, servers) run applications such as web browser Network core routers network of networks Access networks, physical media communication links 3 Network Core Network Core Mesh of routers that connect end systems How to build network core? Circuit switching Resources are reserved Example: telephone Packet-switching Resources are not reserved Example: Internet Circuit Circuit-Switched Network Switched Network Features Constant bit-rate, e.g. 64 kbps PCM channel Short transmission delay Small delay jitters Examples Public Switched Telephone Network (PSTN) Integrated Service Digital Network (ISDN) Suitable for real-time applications that requires constant...
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This note was uploaded on 02/02/2010 for the course ENGINEERIN 520.101 taught by Professor Tracdtran during the Winter '06 term at Johns Hopkins.

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L20-Internet-2009 - 1 Packet Packet-Switched Networks...

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