Presentation is loading. Please wait.

Presentation is loading. Please wait.

Compsci 92, Spring 2015 2.1 Goals for next two weeks l Concepts and use of HTML and CSS  Novice, beginner, apprentice, master, … Know what you don’t know?

Published byJoel Haynes Modified over 9 years ago

Similar presentations

Presentation on theme: "Compsci 92, Spring 2015 2.1 Goals for next two weeks l Concepts and use of HTML and CSS  Novice, beginner, apprentice, master, … Know what you don’t know?"— Presentation transcript:

1 Compsci 92, Spring 2015 2.1 Goals for next two weeks l Concepts and use of HTML and CSS  Novice, beginner, apprentice, master, … Know what you don’t know?  Create, converse, discuss, appreciate, … Learning by doing, reading, re-doing

2 Compsci 92, Spring 2015 2.2 Goals for this week l Web and Internet, from A..Z  Don’t know much about historyknow much l Foundation of deeper knowledge  Differences between client and server  DNS and IP and.. Names and Numbers  How HTTP works in relation to TCP/IP P is for protocol, who decides on these?

3 Compsci 92, Spring 2015 2.3 Understanding: Internet and Web l Yesterday in the news:  Leap second problems? http://cnnmon.ie/1xmg7F2  Cyber security a national imperative? http://abcn.ws/1Ch8d4z l This week in Compsci 92  Creating web pages  Understanding basics of the technical and social foundations of information and the internet

4 Compsci 92, Spring 2015 2.4 Technical and Social Foundations l What is the Internet?  A collection of autonomous systems (AS)s  Network of networks  How do these networks communicate?  Country level, company level, …  Until 2007, 16-bit AS numbers, now 32 bits.. Explore this in more detail

5 Compsci 92, Spring 2015 2.5 Technical and Social Foundations l What is the Internet?  According to … WikipediaWikipedia  According to Jon Stewart and Ted StevensJon Stewart and Ted Stevens  According to Stephen ColbertStephen Colbert

6 Compsci 92, Spring 2015 2.6 https://twitter.com/superwuster/status/506957742083293184

7 Compsci 92, Spring 2015 2.7 What is Net Neutrality? l http://on.cc.com/1DEJrPt http://on.cc.com/1DEJrPt

8 Compsci 92, Spring 2015 2.8 Communication on the Internet l What is an Autonomous System?  On the surface? Deeper down? l Duke has ASN 13371  what is an ASN for YouTube?  Protocols: BGP, IP, STMP, these don't matter today, but next week …

9 Compsci 92, Spring 2015 2.9 Internet Protocol RFC 791, 1981 The internet protocol is specifically limited in scope to provide the functions necessary to deliver a package of bits (an internet datagram) from a source to a destination over an interconnected system of networks. There are no mechanisms to augment end-to-end data reliability, flow control, sequencing, or other services commonly found in host-to-host protocols. The internet protocol can capitalize on the services of its supporting networks to provide various types and qualities of service. http://www.ietf.org/rfc/rfc791.txt

10 Compsci 92, Spring 2015 2.10 Internet Protocol RFC 791, 1981 A distinction is made between names, addresses, and routes [4]. A name indicates what we seek. An address indicates where it is. A route indicates how to get there. The internet protocol deals primarily with addresses. http://www.ietf.org/rfc/rfc791.txt

11 Compsci 92, Spring 2015 2.11 An address indicates where it is l IPv4 address: dotted quad  dig www.cnn.com : 157.166.224.25www.cnn.com  Why do we use name and not address?  Quad part: 0-255, note that 2 8 =256  Why is this a 32-bit address? What’s a bit?  Limitations of 32 bits? l DNS: map name to address l Routers: map address to route

12 Compsci 92, Spring 2015 2.12 Powers of two l 2 2 = 4, 2 3 = 8, … 2 10 = 1024,…  00, 01, 10, 11  000, 001, 010, 011, 100, 101, 110, 111 l IP address first 32 bits, what is 2 32 ?  Bit is a b inary dig it, why use binary? l Now IPv6 address is 128 bits, 2 128 ?  Internet of Things?  http://www.wolframalpha.com/input/?i=n umber+of+atoms+on+earth http://www.wolframalpha.com/input/?i=n umber+of+atoms+on+earth

13 Compsci 92, Spring 2015 2.13 Bits, Bytes, Atoms … $5,350 10MB, 1979 http://bit.ly/1wbCooB

14 Compsci 92, Spring 2015 2.14 Bits, Bytes, Atoms l Byte is 8-bits: 10101010  Kilobyte usually 1000 bytes (1024 bytes)  Megabyte is 1000 2 bytes (1024 2 )  Gigabyte is 1000 3, or a billion l 1 Mb is … http://en.wikipedia.org/wiki/Megabyte http://en.wikipedia.org/wiki/Megabyte  One minute of music on an mp3  500 pages of 2000 characters/page book

15 Compsci 92, Spring 2015 2.15 Interlude l http://bit.ly/92spr15-jan14-1 http://bit.ly/92spr15-jan14-1 l We'll discuss answers, reasons, questions

16 Compsci 92, Spring 2015 2.16 IETF: Internet Engineering Task Force https://www.youtube.com/watch?v=Fpuzl9lvOSM

17 Compsci 92, Spring 2015 2.17 standardization l https://en.wikipedia.org/wiki/HDMI https://en.wikipedia.org/wiki/HDMI  Why do we need standards?  How do we agree on what they are?

18 Compsci 92, Spring 2015 2.18 Standards can be flexible! l high school: 12 lb l open: 16 lb l 85+ woman: 8 lb

19 Compsci 92, Spring 2015 2.19 Internet Addresses and Routing Thinkgeek.com

20 Compsci 92, Spring 2015 2.20 Sir Tim Berners-Lee

21 Compsci 92, Spring 2015 2.21 Compsci 92: what does web do? l We want you to create: this doesn't necessarily imply you're creative  You will learn and understand at different levels  We will learn about you, e.g., "my favorite things"  You will learn about each other: toward a successful course

22 Compsci 92, Spring 2015 2.22 Compsci 92: What does web do? l Levels of knowledge and computational thinking  Everyone has used the web  Fourth graders can create pages on weebly.com  Google engineers are optimizing mobile web experience  What does web have to do with net neutrality?

23 Compsci 92, Spring 2015 2.23 What is a web page? l Depends on your point of view  You, parents, grandparents?  Student in Compsci Compsci 92?  Software engineer at Amazon, Google, … l What is a webserver?  What is a browser?

24 Compsci 92, Spring 2015 2.24 What is a webserver? l http://wiki.nginx.org/Main http://wiki.nginx.org/Main  Nginx powers several high-visibility sites, such as Netflix, Hulu, Pinterest, CloudFlare, Airbnb, WordPress.com, GitHub, SoundCloud, Zynga, Eventbrite, Zappos, Media Temple, Heroku, RightScale, Engine Yard and MaxCDN l What does this software do?

25 Compsci 92, Spring 2015 2.25 What is a web browser? l http://www.w3counter.com/trends http://www.w3counter.com/trends l What does this software do?

26 Compsci 92, Spring 2015 2.26 Computer Science l https://www.youtube.com/watch?v=-Ht4qiDRZE8 https://www.youtube.com/watch?v=-Ht4qiDRZE8 l http://bit.ly/17G3IHj http://bit.ly/17G3IHj l Who is Luis von Ahn, what's his path?  Visiting Duke to talk to in April

27 Compsci 92, Spring 2015 2.27 Internet: Technical Foundations l What is IPv4? Who created it? IPv6? l Who governs the Internet? l What is a domain name? l What is a cookie? l What is DNS? ICANN? l What is IP, SMTP, BGP, HTTP?

28 Compsci 92, Spring 2015 2.28 Susan Athey l https://www.youtube.com/watch?v=8XyRVcJz7RY https://www.youtube.com/watch?v=8XyRVcJz7RY l From Data to Bitcoin  Duke connection

Download ppt "Compsci 92, Spring 2015 2.1 Goals for next two weeks l Concepts and use of HTML and CSS  Novice, beginner, apprentice, master, … Know what you don’t know?"

Similar presentations

CSC 101 Fall 2012 Felicia Furino December 13, 2012.

CSC 101 Fall 2012 Felicia Furino December 13, 2012.
(4.4) Internet Protocols Layered approach to Internet Software 1.

(4.4) Internet Protocols Layered approach to Internet Software 1.
Network Layer and Transport Layer.

Network Layer and Transport Layer.
© 2010, Robert K. Moniot Chapter 1 Introduction to Computers and the Internet 1.

© 2010, Robert K. Moniot Chapter 1 Introduction to Computers and the Internet 1.
The Internet Useful Definitions and Concepts About the Internet.

The Internet Useful Definitions and Concepts About the Internet.
Chapter Extension 7 How the Internet Works © 2008 Prentice Hall, Experiencing MIS, David Kroenke.

Chapter Extension 7 How the Internet Works © 2008 Prentice Hall, Experiencing MIS, David Kroenke.
The Internet and the World Wide Web. Una DooneyThe Internet and WWWSlide 2 What is the Internet? A collection of networks (LANS and WANS) around the world.

The Internet and the World Wide Web. Una DooneyThe Internet and WWWSlide 2 What is the Internet? A collection of networks (LANS and WANS) around the world.
Introduction to Web Pages. Slide 2 Lecture Overview Evolution of the Internet and Web Web Protocols.

Introduction to Web Pages. Slide 2 Lecture Overview Evolution of the Internet and Web Web Protocols.
Introduction to Management Information Systems Chapter 5 Data Communications and Internet Technology HTM 304 Fall 07.

Introduction to Management Information Systems Chapter 5 Data Communications and Internet Technology HTM 304 Fall 07.
What computers talk about and how. (Networking & the Internet.) COS 116: 4/3/2008 Sanjeev Arora.

What computers talk about and how. (Networking & the Internet.) COS 116: 4/3/2008 Sanjeev Arora.
© 2004, Robert K. Moniot Chapter 1 Introduction to Computers and the Internet.

© 2004, Robert K. Moniot Chapter 1 Introduction to Computers and the Internet.
ECS152BXin Liu 1 ECS 152B Computer Networks Fall 2003 Prof. Xin Liu www.cs.ucdavis.edu/~liu/152B/152b.html.

ECS152BXin Liu 1 ECS 152B Computer Networks Fall 2003 Prof. Xin Liu
Internet Basics.

Internet Basics.
Mohammed Saiyeedur Rahman.  E-commerce is buying and selling goods over the internet. This could include selling/buying mobile phones, clothes or DVD’s.

Mohammed Saiyeedur Rahman.  E-commerce is buying and selling goods over the internet. This could include selling/buying mobile phones, clothes or DVD’s.
A global, public network of computer networks. The largest computer network in the world. Computer Network A collection of computing devices connected.

A global, public network of computer networks. The largest computer network in the world. Computer Network A collection of computing devices connected.
Internet Services -World Wide Web -E-mail -Conferencing and Newsgroups -File Transfer & Updating -Chat/Instant Messaging.

Internet Services -World Wide Web - -Conferencing and Newsgroups -File Transfer & Updating -Chat/Instant Messaging.
Mr C Johnston ICT Teacher

Mr C Johnston ICT Teacher
Intro to Computer Networks Internet and Networking Terms Bob Bradley The University of Tennessee at Martin.

Intro to Computer Networks Internet and Networking Terms Bob Bradley The University of Tennessee at Martin.
Connecting one computer to another computer creates a network.

Connecting one computer to another computer creates a network.
 TCP/IP is the communication protocol for the Internet  TCP/IP defines how electronic devices should be connected to the Internet, and how data should.

 TCP/IP is the communication protocol for the Internet  TCP/IP defines how electronic devices should be connected to the Internet, and how data should.

Similar presentations

Ads by Google