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Internet Layering Level 5 -- Application Layer (rlogin, ftp, SMTP, POP3, IMAP, HTTP..) Level 4 -- Transport Layer(a.k.a Host-to-Host) (TCP, UDP) Level 3 -- Network Layer (a.k.a. Internet) (IP, ICMP, ARP) Level 2 -- (Data) Link Layer / MAC sub-layer (a.k.a. Network Interface or
Network Access Layer) Level 1 -- Physical Layer
Today’s Agenda Applications Layer
DNS nslookup Multimedia
Applications of the future Cisco SmartCare (Matt Rollins)
http://www.cisco.com/en/US/products/ps7343/serv_group_home.html
GoRemote Wireless Access (Anselm Kia) GoRemote is now iPass (ipass.com)
http://www.myxpl.com (username:cmpe | password:cmpe)
MultimediaIntroduction to Audio
Audio Compression
Streaming Audio
Internet Radio
Voice over IP
Introduction to Video
Video Compression
Video on Demand
The MBone – The Multicast Backbone
Introduction to Audio
(a) A sine wave. (b) Sampling the sine wave. (c) Quantizing the samples to 4 bits.
Audio Compression
(a) The threshold of audibility as a function of frequency.(b) The masking effect.
Streaming Audio (2)
When packets carry alternate samples, the loss of a packet reduces the temporal resolution rather than creating a gap in time.
Streaming Audio (3)
The media player buffers input from the media server and plays from the buffer rather than directly from the network.