Web Systems. Lecture 1. An Overview of Web Systems
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1 Web Systems Lecture 1 An Overview of Web Systems Paul I-Hai Lin, Professor of Electrical and Computer Engineering Technology Dept. of Computer, Electrical, and Information Technology College of Engineering, Technology, and Computer Science Purdue University Fort Wayne 1 Web Systems A study of essential knowledge and skills that an effective web administrator must know. Introduction to fundamental topics of web technologies, web-based systems, and web page design. Topics covered include Internet applications, web site development and publishing, information architecture, client and server-side programming, multimedia technologies and publishing, vulnerabilities, and web site implementation and maintenance. 2 1
2 Web Systems Web Systems utilize Computer Systems Communications and Networking Technology The Internet Technology & Services Web Clients, Web Sites & Servers Web sites, Web pages, contents, apps, services Cloud Data Centers and Storage Systems Web Enabled, Assisted Applications Online E-Commerce & E-Business Web Content Sharing Web Services Enterprise Computer System & App Integration Enterprise Data Integration etc 3 Web Systems need to utilize Computer Systems Main Frames (IBM z14) Networked Computers in Data centers Server computers Workstation computers Desktops/Laptops Embedded computers Mobile Devices (smart phones, tablet, ipad, etc) 4 2
3 Web Systems need to utilize Networking & Communication Systems 5 Web Systems use Internet infrastructure Internet, The Internet is the global system of interconnected computer networks that use the Internet protocol suite (TCP/IP) to link devices worldwide. It is a network of networks that consists of private, public, academic, business, and government networks of local to global scope, linked by a broad array of electronic, wireless, and optical networking technologies. The Internet carries an extensive range of information resources and services, such as the inter-linked hypertext documents and applications of the World Wide Web (WWW), electronic mail, telephony, and file sharing. 6 3
4 Internet Interconnected Global Computer Networks Networks of networks A collection of LANs, WiFi, and WANs systems and network enabled devices and/or computers from private, public, government, and business networks TCP/IP Protocols and Applications Carry and support an extensive range of information resources and services 7 Web Systems share and deliver Data and Information Resources and Services: Voice Multimedia Video Medical record Images Web pages Document etc 8 4
5 Remote Measurement/Monitoring/Control Web Enabled 9 Internet- and Web-enabled Enterprise IT Services & Operation Environment: An Example 10 5
6 Enterprise Applications and Data Integration 11 Web Servers for Enterprise Applications and Data Integration 12 6
7 Web Browser/Web Server Interaction 13 Web Clients Browser Statistics, Chrome IE/Edge Firefox Safari Opera July 76.7 % 4.2 % 13.3 % 3.0 % 1.2 % June 76.3 % 4.6 % 13.3 % 3.3 % 1.2 % May 75.8 % 4.6 % 13.6 % 3.4 % 1.1 % Apr 75.7 % 4.6 % 13.6 % 3.7 % 1.1 % Mar 75.1 % 4.8 % 14.1 % 3.6 % 1.0 % Feb 74.1 % 4.8 % 15.0 % 3.6 % 1.0 % Jan 73.7 % 4.9 % 15.4 % 3.6 % 1.0 % 14 7
8 Web Browser Architecture User Interface Controller (uses keyboard, mouse, client protocols/script programs) HTML/ XML Parser DCOM Transmission Control Protocol (TCP) CSS Style Sheets /Parser Content Model HTTP FTP TELNET SMTP Frame Constructor Cache, Client Protocols, Programs Paiting Internet Protocol (IP) Medium Access Control (MAC) Display Physical Layer (wired/wireless) IEEE Firewall WLAN physical layer Ethernet a/b/g n IE Web Browser Architecture [accessed 2017/8/22] 16 8
9 The Chromium Project - Multiprocess Architecture, hromium.org/ developers/de signdocuments/m ulti-processarchitecture [accessed 2017/8/22] Chrome Browser Architecture 17 Web Servers/Web Sites Netcraft Web Server Survey May 2017 Web server survey, web-server-survey.html Microsoft IIS 49.1% Apache % NGINX 29.22% Google 1.05% 18 9
10 Web Servers (HTTP Server) HTTP (HyperText Transfer Protocol Port 80) HTTPs (HyperText Transfer Protocols Secured Port 443) protocols 19 Internet Service Providers (ISPs) Basic Services Provided DNS (Domain Name Resolution Service): translating domain name into an IP address. RADIUS: User Authentication Dial-In User Services, and accounting WWW: Basic web hosting and server functionality; FTP, etc Providing POP3 (post office protocol), IMAP (Internet Message Access Protocol) and SMTP (Simple Mail Transfer Protocols) services 20 10
11 Internet Service Providers (ISPs) ISP Connection Types DSL (Digital Subscriber Line): DSL modem, Router Fiber: Verizon FIOS, Cable: Cable Internet Access, Satellite: The Best Satellite ISP in 2017, Wireless ISP: Cellular ork/wwan.jsp 21 Internet Service Providers (ISPs) Internet Providers in Fort Wayne, [accessed 2017/8/20] Verison DSL, Fiber Frontier FiOS Fiber, DSL Xfinity (Comcast) - cable CenturyLink DSL, Fiber HiughesNet - Satellite 22 11
12 Web Systems May use Data Centers Networked Computer Systems in Data Centers Globaldots.com Consulttech.us Datacenters.com Stackoverflow.com 23 AWS Global Infrastructure (Amazon Web Services) AWS Global Infrastructure, The AWS Cloud operates 44 Availability Zones within 16 geographic Regions around the world, with announced plans for 14 more Availability Zones and 5 more Regions in China, France, Hong Kong, Sweden, and a second AWS GovCloud Region in the US
13 AWS Global Infrastructure AWS Global Infrastructure, 25 AWS Global Infrastructure Azure Regions, [accessed 2017/8/17] 26 13
14 Hot Topics in Web Systems and Technologies HotWeb 2016, Oct , 4 th IEEE Workshop, 6/ Content delivery architectures Peer-to-Peer systems Support for mobile and wireless systems Web caching and replication Edge services and dynamic content delivery 27 Hot Topics in Web Systems and Technologies Multimedia content distribution Overlay networks Content placement and request routing Measurement studies of deployed systems Security and privacy Wide-area upload and content gathering Novel web-based applications Web/database integration Information retrieval and searching Electronic commerce 28 14
15 Hot Topics in Web Systems and Technologies Internet telephony Social computing Web of Things Mobile web Big web data 29 Summary 30 15
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