IST 220: Application Layer
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1 IST 220: Layer Abdullah Konak School of Information Sciences and Technology Penn State Berks Learning Objectives. Focus on applications, not the theory how things work. A. Konak IST 220: Ch2- Layer 2 1
2 / Model (Paradigm) WS-FTP Network FTP Internet Explorer Outlook Express, EUDORA Web (IIS, Apache) Mail (POP,, IMAP) A. Konak IST 220: Ch2- Layer 3 / Networks Printer Print Services Print s use the applications on dedicated servers File Database Program Database A. Konak IST 220: Ch2- Layer 4 2
3 Addressing at Layer A. Konak IST 220: Ch2- Layer 5 Electronic (Mail ) is a store-forward application on the Internet. Components User Agents: Pine, Eudora, MS Outlook. Mail Transfer Agent Mail Transfer Protocols : Simple Mail Transfer Protocol () Mail Access Protocols : Post Office Protocol (POP) A. Konak IST 220: Ch2- Layer 6 3
4 Mail Protocols Mail Delivery Protocols Simple Mail Transfer Protocol (): a simple protocols that defines the format of the message and pushes from clients to servers. Mail Access Protocols Post Office Protocol (POP): Used to download s to client computers from the mailbox at servers. Internet Mail Access Protocols (IMAP): provides clients with tools to store and manipulate s on the mail server. A. Konak IST 220: Ch2- Layer 7 Mail Delivery Internet Sender pushes s to the local server Mail Local pushes s to the remote server Mail Remote MAILBOX Mail Access (POP) the client sends request Receiver POP s are queued on the local server until the remote server is ready to receive them. s are stored on the mailbox until clients delete or download them. the client pulls the s Step 1 Step 2 Step 3 A. Konak IST 220: Ch2- Layer 8 4
5 File Transfer Protocol (FTP) Electronically transfer files from one computer to another. A. Konak IST 220: Ch2- Layer 9 TELNET TELNET is a general-purpose client-server program that let a user access any application program on a remote computer. A. Konak IST 220: Ch2- Layer 10 5
6 HTTP and World Wide Wed =Hypertext Markup Language HTTP=Hypertext Transfer Protocol A. Konak IST 220: Ch2- Layer 11 Components of HTTP : Browser Internet Explorer Netscape ( FireFox ( : Web Microsoft Internet Information Services (or ) IIS Apache ( Zeus Web Sun ONE (Netscape iplanet Web ) A. Konak IST 220: Ch2- Layer 12 6
7 The State of the Current Web Technologies Web Technologies Static Web s Dynamic Web s Active Web s ASP.NET Java Pages PHP Cold Fusion JavaScript Dynamic A. Konak IST 220: Ch2- Layer 13 Static s Network Browser (IE, Netscape, Mozilla) Request Web (IIS, Apache) Web Root Directory Response A. Konak IST 220: Ch2- Layer 14 7
8 Dynamic s accesses databases Database Browser (IE, Netscape, Mozilla) Request Network Web (IIS, Apache) Run side complier (CGI, PHP, ASP.NET) Side Code Creates documents Response Output A. Konak IST 220: Ch2- Layer 15 Active s Browser (IE, Netscape, Mozilla) Network Request Web (IIS, Apache) Web Root Directory Output User Input side script interpreter (JavaScript, VBScript) & Script Response & Script A. Konak IST 220: Ch2- Layer 16 8
9 Browser & Addressing A. Konak IST 220: Ch2- Layer 17 9
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