Due date for pairs programming assignment is next Wednesday before class. 2/16/ Larry Snyder, CSE 1
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1 Midterm corrections BEFORE Friday LOCATION CHANGE next Tuesday s lab (Feb 22) will be held in CSE 403, where we will hear Richard Ladner on accessibility Due date for pairs programming assignment is next Wednesday before class 2/16/ Larry Snyder, CSE 1
2 What is Chicago? What is Toronto???? What is Chicago? But, in Final Jeopardy: US Cities This city s largest airport is named for a WWII hero, and its second largest airport is named for a famous WWII battle Watson completely blew it! 2/16/ Larry Snyder, CSE 2
3 2/16/ Larry Snyder, CSE 3
4 Connected computers are better! How s it done? Lawrence Snyder University of Washington, Seattle Lawrence Snyder 2004
5 Computers are useful alone, but are better when connected (networked) Access more information and software than is stored locally Help users to communicate, exchange information changing ideas about social interaction Perform other services printing, Web, , texting, mobile, etc. Today s Message: Internet is NOT really a bunch of tubes! 5
6 Networks are structured differently based (mostly) on distance between computers: Local area network (LAN) Small area: room or building Either wired (Cu or fiber) or wireless Wide area networks (WAN) Large area: more than 1 km Fiber optic, copper transmission lines, μ wave, satellite Metropolitan area networks (MAN) Neighborhood or several blocks of business district Private service provider owns network 6
7 To communicate computers need to know how to set up the info to be sent and interpret the info received Communication rules are a protocol Example protocols EtherNet for physical connection in a LAN TCP/IP for Internet transmission control protocol / internet protocol HTTP for Web hypertext transfer protocol 7
8 EtherNet is a popular LAN protocol It uses a party protocol Connection to campus network infrastructure Typical MGH or OUGL Lab PC PC PC PC PC PC Ether Net Cable 8
9 The campus subnetworks interconnect computers of the UW domain which connects to Internet via a gateway Switch Homer Dante MGH Gate way washington.edu Student CS Switch All communication by TCP/IP 9
10 Information is sent across the Internet using IP Cerf uses postcard analogy Break message into fixed size units Form IP packets with destination address, sequence number and content addr # data Each makes its way separately to destination, possibly taking different routes Reassembled at destination forming msg Key Point: Taking separate routes lets packets bypass congestion and out-of-service switches; packet reassembly discovers lost packets; ask for resend 10
11 Two videos are linked from the calendar please check them out
12 12
13 You can find such trace route facilities by Googling, and then type in the IP-Addresses around the world 13
14 The route Starts with my ISP moving packet through MAN Next, the packet enters a regional WAN Next, the packet crosses the backbone Arriving at another regional WAN Next arriving on campus in a LAN Delivered to the destination computer 14
15 The Watchtower regional network of Eastern MA Every state/region has one or a few 15
16 16
17 As with wired Ethernet, all computers in range can hear the radio signals of the others
18 People name computers by a domain name a hierarchical scheme that groups like computers.edu All educational computers, a TLD.washington.edu All computers at UW dante.washington.edu A UW computer.ischool.washington.edu ischool computers.cs.washington.edu CSE computers spiff.cs.washington.edu A CSE computer Peers Domains begin with a dot and get larger going right 18
19 Computers are named by IP address, four numbers in the range cse.washington.edu: ischool.washington.edu: Remembering IP addresses would be brutal for humans, so we use domains Computers find the IP address for a domain name from the Domain Name System an IP address book computer A computer needs to know IP address of DNS server! 19
20 .edu.com.mil.gov.org.net domains are top level domains for the US Recently, new TLD names added Each country has a top level domain name:.ca (Canada).es (Spain).de (Germany).au (Australia).at (Austria).us (US) Do you know sites like: bit.ly del.icio.us they exploit TLDs 20
21 View the Internet in two ways: 1. Humans see a hierarchy of domains relating computers logical network 2. Computers see groups of four number IP addresses physical network Both are ideal for the user's needs The Domain Name System (DNS) relates the logical network to the physical network by translating domains to IP addresses 21
22 Many people mis use the terms Internet and World Wide Web Let s get them right Internet: all of the wires, fibers, switches, routers etc. connecting named computers Web: That part of the Internet web servers that store info and serve Web pages and provide other services to client computers 22
23 The Web and much of the Internet services use the client server form of interaction It s a VERY BRIEF relationship 2/16/ Larry Snyder, CSE 23
24 Clients and servers are not connected they only exchange info no commitment issues 2/16/ Larry Snyder, CSE 24
25 Networking changed the world Internet: named computers using TCP/IP WWW: servers providing Web pages Principles Logical network of domain names Physical network of IP addresses Protocols rule: LAN, TCP/IP, http... Domain Name System connects the two Client/Server, fleeting relationship on WWW 25
Connected computers are better! How s it done? Lawrence Snyder University of Washington, Seattle
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