Slide mạng máy tính nâng cao chapter7 the application layer

Chapter The Application Layer CuuDuongThanCong.com https://fb.com/tailieudientucntt DNS – The Domain Name System • • • The DNS Name Space Resource Records Name Servers CuuDuongThanCong.com https://fb.com/tailieudientucntt The DNS Name Space A portion of the Internet domain name space CuuDuongThanCong.com https://fb.com/tailieudientucntt Resource Records The principal DNS resource records types CuuDuongThanCong.com https://fb.com/tailieudientucntt Resource Records (2) A portion of a possible DNS database for cs.vu.nl CuuDuongThanCong.com https://fb.com/tailieudientucntt Name Servers Part of the DNS name space showing the division into zones CuuDuongThanCong.com https://fb.com/tailieudientucntt Name Servers (2) How a resolver looks up a remote name in eight steps CuuDuongThanCong.com https://fb.com/tailieudientucntt Electronic Mail • • • • • Architecture and Services The User Agent Message Formats Message Transfer Final Delivery CuuDuongThanCong.com https://fb.com/tailieudientucntt Electronic Mail (2) Some smileys They will not be on the final exam :-) CuuDuongThanCong.com https://fb.com/tailieudientucntt Architecture and Services Basic functions • • • • • CuuDuongThanCong.com Composition Transfer Reporting Displaying Disposition https://fb.com/tailieudientucntt SIP – The Session Initiation Protocol The SIP methods defined in the core specification CuuDuongThanCong.com https://fb.com/tailieudientucntt SIP (2) Use a proxy and redirection servers with SIP CuuDuongThanCong.com https://fb.com/tailieudientucntt Comparison of H.323 and SIP CuuDuongThanCong.com https://fb.com/tailieudientucntt Video Analog Systems The scanning pattern used for NTSC video and television CuuDuongThanCong.com https://fb.com/tailieudientucntt The JPEG Standard The operation of JPEG in lossy sequential mode CuuDuongThanCong.com https://fb.com/tailieudientucntt The JPEG Standard (2) (a) RGB input data (b) After block preparation CuuDuongThanCong.com https://fb.com/tailieudientucntt The JPEG Standard (3) (a) (b) (a) One block of the Y matrix (b) The DTC coefficients CuuDuongThanCong.com https://fb.com/tailieudientucntt The JPEG Standard (4) Computation of the quantized DTC coefficients CuuDuongThanCong.com https://fb.com/tailieudientucntt The JPEG Standard (5) The order in which the quantized values are transmitted CuuDuongThanCong.com https://fb.com/tailieudientucntt The MPEG Standard Synchronization of the audio and video streams in MPEG-1 CuuDuongThanCong.com https://fb.com/tailieudientucntt The MPEG Standard (2) Three consecutive frames CuuDuongThanCong.com https://fb.com/tailieudientucntt Video on Demand Overview of a video-on-demand system CuuDuongThanCong.com https://fb.com/tailieudientucntt Video Servers A video server storage hierarchy CuuDuongThanCong.com https://fb.com/tailieudientucntt Video Servers (2) The hardware architecture of a typical video server CuuDuongThanCong.com https://fb.com/tailieudientucntt The MBone – The Multicast Backbone MBone consists of multicast islands connected by tunnels CuuDuongThanCong.com https://fb.com/tailieudientucntt ... and reading mail when the receiver has a permanent Internet connection and the user agent runs on the same machine as the message transfer agent (b) Reading e-mail when the receiver has a dial-up...DNS – The Domain Name System • • • The DNS Name Space Resource Records Name Servers CuuDuongThanCong.com https://fb.com/tailieudientucntt The DNS Name Space A portion of the Internet domain... https://fb.com/tailieudientucntt Forms (2) (a) The HTML for an order form (b) The formatted page (b) CuuDuongThanCong.com https://fb.com/tailieudientucntt Forms (3) A possible response from the browser to the server with information