CMPT 165 Intro to Internet & WWW. Sept. 10 th 2015
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1 CMPT 165 Intro to Internet & WWW Sept. 10 th 2015
2 Admin Survey on TA office hours Course website 2
3 My objectives I aim to teach you concepts that will stay with you for a long, long time.. (hopefully really long time!) Good (or bad) news: we won t test you on definitions How to know if you truly understand concepts? Try the 5W s: What Who When Where Why How e.g. What is a modem made of? Who uses modems? When is it (un)necessary? Where can it (not) be installed? Why would one choose a modem over a wireless router? How does a modem work really? 3
4 Today s agenda Preliminaries Internet & its structure Network devices: modems, router, etc. Learn few terms & concepts: Client/Server communication How data is transmitted over the internet Connection and network types IP address 4
5 In-class Exercise #1 Instructions: 1. Get into groups of 3 2. Find a piece of paper 3. Write your student IDs on top-right corner 4. Delegate one student to write down answers 5. Answers derived from group discussions only; no other tools allowed. At the end of 30min. session We will have your answer sheets marked after Marker: write your student IDs on top-left corner When answering questions: Use bullet points Be as precise as possible Your group scores will be kept on file for future reference 5
6 1. What is a computer? 2. What does binary mean? 3. What is a software? Questions 4. What are differences between software and hardware? 5. What is malware? 6. What is physical memory? 7. What does upload means? 8. How is download differ from upload? 9. What does a modem do? 10. What is a network? How is Facebook related to the term network? 11. What is an ADSL? 12. What is a command prompt? 13. What is ipconfig? 14. What is an IP? 6
7 Preliminaries Computer: device that is programmed (instructed) to perform some operations automatically Hardware: physical items that you buy at a store e.g. motherboard, hard drive, memory card, etc. 7
8 Preliminaries 8
9 Preliminaries 9
10 Preliminaries Computer: device that is programmed (instructed) to perform some operations automatically Hardware: physical items that you buy at a store e.g. motherboard, hard drive, memory card, etc. Software: instructions stored and run by hardware 3 common types: Application: Browser ( FireFox ), Word, PowerPoint, Paint, Acrobat Reader, Notepad++, System: Operating system: e.g. OS X of Mac, Windows of PC Devices drivers (for printer, monitor, scanners, etc.) Malware: malicious software 10
11 Data Preliminaries Computers do not read text like humans do They are programmed to interpret streams of bits only, e.g Bits (binary digits): 2 states binary 8 bits = 1 byte Example above: 3 bytes of data Memory storage Physical: data is stored permanently on device E.g. Hard drive, USB local storage Virtual: data is lost after computer is shut off Modem: modulator-demodulator Encode/decode data for communication between devices streams of bits signals signals streams of bits 11
12 Preliminaries Summary Hardware Software Application software Operating system Malware Data Bits Bytes Memory storage Virtual Physical Modem 12
13 Internet & its Structure 13
14 What is the Internet? Inter-connected network Computer network: computers connected together Connected: Communication channels established Data transferred between individual network entities Illustration: (links/lines as connections between endpoints) Internet : typically used to refer to its global nature Billions of computers world wide interconnected via some infrastructure 14
15 Illustration of the 2005 Internet Dark blue:.net.ca.us Green:.com.org Red:.mil.gov.edu Yellow:.jp.cn.tw... Magenta:.uk.it.fr... CMPT 165 D1 (Summer 2005) 15
16 Illustration of the 2010 Internet Warmer color indicates denser connections CMPT 165 D1 (Summer 2005) 16
17 Internet vs. World Wide Web Consists of a set of software services running on the Internet + webpages (connected documents) World Wide Web Consortium (W3C) made up of member organizations, each with staff working on developing standards for the WWW Has 397 members as of April 2015 [wiki] CMPT 165 D1 (Summer 2005) 17
18 A dichotomy of the network 18
19 Structure of a simple network Home#1: consists of laptop, tablet, computer, router Home#2: computer,, modem Home#3 (or office/lab): printer,, modem Simple computers that serve to relay data Networking devices Internet Service Providers (Gateways) Web servers (computers with sophisticated hard/software) Greg Baker 19
20 Establishing connection (communication) Data transmission process: Suppose you request to view the webpage on your tablet 1. Client (B): requests the webpage for 2. Networking device (D): relays request to the correct path 3. Server (L): receives + processes request + send data back????? SFU web server hosting Greg Baker 20
21 Related Internet terminologies Upload vs. download data Local area network vs. wide area network Greg Baker 21
22 Networking devices Devices L + S have 2 communication pathways - Uses these devices to relay data so they go through best path - E.g. Router, Hub, Switch Greg Baker 22
23 Common connection types Wired: Wireless: Greg Baker 23
24 Common connection types Wired: Ethernet: connects devices with wire Dial-up: connects via phone line Cannot surf while on phone ADSL (Asymmetric Digital Subscriber Line): copper wire phone line Faster than Dial-Up Download faster than upload TV cable Modem: e.g electrical signals Wireless: Wi-Fi wireless fidelity network e.g b, g Radio waves to transmit data Bluetooth Radio waves of shorter wavelengths Meant for shorter distances Wireless router: radio wave signals 24
25 Other types of network Mobile Phones use either wifi or mobile network, if wifi N/A Data is transmitted wirelessly to phone towers Slowest to fastest: GSM, EDGE, 3G, HSPA, LTE Fiber optic Strands of glass or plastic, slightly thicker than hair Transmit data as pulses of light Works very well even over long-distance 25
26 Computer: defined Quick recap Different types of computers: routers, modems, tablet Roles of computers: Clients vs. Servers What is a connection What is involved in the communication Data transfer process How connections are established between them Physical vs. non-physical 26
27 Next week Finish off last 3 questions Start on Unit 2 27
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