Computer Chapter 2 Networking A TOP-DOWN APPROACH VENTH IDITION Application Layer KUROSE·ROSS A note on the use of these Powerpoint slides: We're making these slides freely available to all (faculty.students,readers). They're in PowerPoint form so you see the animations;and can add,modify. and delete slides (including this one)and slide content to suit your needs. They obviously represent a lot of work on our part.In return for use,we only ask the following: Computer If you use these slides (e.g.,in a class)that you mention their source (after all,we'd like people to use our book!) Networking:A Top If you post any slides on a ww site,that you note that they are adapted from (or perhaps identical to)our slides,and note our copyright of this Down Approach material. 7th edition Thanks and enjoy!JFK/KWR Jim Kurose,Keith Ross All material copyright 1996-2016 Pearson/Addison Wesley April 2016 J.F Kurose and K.W.Ross,All Rights Reserved Application Layer 2-1
Computer Networking: A Top Down Approach A note on the use of these Powerpoint slides: We’re making these slides freely available to all (faculty, students, readers). They’re in PowerPoint form so you see the animations; and can add, modify, and delete slides (including this one) and slide content to suit your needs. They obviously represent a lot of work on our part. In return for use, we only ask the following: ▪ If you use these slides (e.g., in a class) that you mention their source (after all, we’d like people to use our book!) ▪ If you post any slides on a www site, that you note that they are adapted from (or perhaps identical to) our slides, and note our copyright of this material. Thanks and enjoy! JFK/KWR All material copyright 1996-2016 J.F Kurose and K.W. Ross, All Rights Reserved 7 th edition Jim Kurose, Keith Ross Pearson/Addison Wesley April 2016 Chapter 2 Application Layer Application Layer 2-1
Chapter 2:outline 2.I principles of network 2.5 P2P applications applications 2.6 video streaming and 2.2 Web and HTTP content distribution 2.3 electronic mail networks ·SMTP,POP3,IMAP 2.7 socket programming 2.4 DNS with UDP and TCP Application Layer2-2
Application Layer2-2 Chapter 2: outline 2.1 principles of network applications 2.2 Web and HTTP 2.3 electronic mail • SMTP, POP3, IMAP 2.4 DNS 2.5 P2P applications 2.6 video streaming and content distribution networks 2.7 socket programming with UDP and TCP
Chapter 2:application layer our goals: learn about protocols by ■conceptual,, examining popular implementation aspects application-level of network application protocols protocols ·HTTP ·transport-layer ·FTP service models ·SMTP/POP3/IMAP ·client-server ·DNS paradigm creating network ·peer-to-peer applications paradigm ·socket API content distribution networks Application Layer2-3
Application Layer2-3 Chapter 2: application layer our goals: ▪ conceptual, implementation aspects of network application protocols • transport-layer service models • client-server paradigm • peer-to-peer paradigm • content distribution networks ▪ learn about protocols by examining popular application-level protocols • HTTP • FTP • SMTP / POP3 / IMAP • DNS ▪ creating network applications • socket API
Some network apps ■e-mail ■voice over IP(e-g, ■web Skype) ■text messaging real-time video ■remote login conferencing ■P2 P file sharing ■social networking ■multi-.user network ■search games streaming stored video (YouTube,Hulu, Netflix) Application Layer2-4
Application Layer2-4 Some network apps ▪ e-mail ▪ web ▪ text messaging ▪ remote login ▪ P2P file sharing ▪ multi-user network games ▪ streaming stored video (YouTube, Hulu, Netflix) ▪ voice over IP (e.g., Skype) ▪ real-time video conferencing ▪ social networking ▪ search ▪ … ▪ …
Creating a network app pplication trans port network data link physical write programs that: run on(different)end systems communicate over network e.g.,web server software communicates with browser software no need to write software application transport network for network-core devices data link application physical transport network-core devices do not data link run user applications applications on end systems allows for rapid app development,propagation Application Layer2-5
Application Layer2-5 Creating a network app write programs that: ▪ run on (different) end systems ▪ communicate over network ▪ e.g., web server software communicates with browser software no need to write software for network-core devices ▪ network-core devices do not run user applications ▪ applications on end systems allows for rapid app development, propagation application transport network data link physical application transport network data link physical application transport network data link physical