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CS335 Networking & Network Administration

CS335 Networking & Network Administration. Tuesday, June 1, 2010. IP telephony. Equipment is less costly than telephone switches Backward compatible with PSTN (public switched telephone network)

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CS335 Networking & Network Administration

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  1. CS335 Networking &Network Administration Tuesday, June 1, 2010

  2. IP telephony • Equipment is less costly than telephone switches • Backward compatible with PSTN (public switched telephone network) • Be able to work with calls that originate with PSTN and terminate with IP telephone and vice versa

  3. Encoding • Audio is encoded using Pulse Code Modulation (PCM) • The digitized audio is transferred using Real-Time Transport Protocol (RTP) – RTP solves some of the problems of duplication, jitter, and out of order delivery • Each RTP message is encapsulated in UDP datagram, which is further encapsulated in IP datagram

  4. Basic IP telephone system • IP telephone • Media Gateway Controller

  5. Interoperation • Media Gateway • Signaling gateway

  6. SIP – Session Initiation Protocol • Operates at application layer • Encompasses all aspects of signaling, including location of a called party, notification and setup (ringing a phone), determination of availability, and termination • Provides services such as call forwarding • Relies on multicast for conference calls • Allows the two sides to negotiate capabilities and choose the media and parameters to be used

  7. Example SIP session

  8. IP telephones and electrical power • Analog phones don’t need power • IP telephones need power also • Power over ethernet

  9. FTP • BSD UNIX

  10. FTP • Establish connection • Authorize • Put or Get files • List files • cd, cdup, ls

  11. File types • Binary • Text • Verbose and quiet mode

  12. TFTP • Trivial file transfer protocol • Uses udp • Devices use this to update software to devices like switches, routers, etc.

  13. NSF - Network File System • Accommodates applications that only need to read or write a part of a file • Integrated into a computer’s file system • http://www.uwsg.iu.edu/usail/network/nfs/overview.html • http://www.faqs.org/rfcs/rfc1094.html • http://www.tldp.org/LDP/nag/node140.html

  14. WWW • Browsing • http • https • Html • Xml • Web caching

  15. Dynamic Web • CGI • ASP • JSP • PHP • Lasso • Cold Fusion • Java • Javascript

  16. RPC • Remote Procedure Call • Places procedures on more than one machine

  17. RPC • Remote

  18. RPC • Communication stubs – software to implement the RPC

  19. Middleware • ONC RPC • CDE/RPC • MSRPC • CORBA • MSRPC2 • COM/DCOM • JINI • SOAP • XML

  20. RPC • http://www.microsoft.com/technet/security/bulletin/MS04-012.mspx • http://www.cs.cf.ac.uk/Dave/C/node33.html • http://searchwebservices.techtarget.com/sDefinition/0,,sid26_gci214272,00.html

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