Internet Today’s Internet – Very different from yesterday’s Very different from tomorrow’s

What is the Internet? yThe Internet is a constellation of communicating devices supported by a common communications protocol (TCP/IP), offering these capabilities/ (applications): ySMTP – Simple Mail Transport Protocol (aka “ ”) ytelnet -- the ability to connect to a remote host and interact as if one where onsite yFTP – File Transfer Protocol, the ability to connect to a remote host and upload/download a file

Internet History Milestones zEarly discoveries -- ARPANET networks & Telnet & TCP/IP (1983) ARPANET zFTP -- file transfer protocol--Archie zGopher menu client --don’t forget Veronica & Jughead (sample) zWWW added graphics & media-- moved from classroom to boardroom zInternet new possibilities— Now you see Web 2.0 (or Lib 2.0)

Sample Gopher Menu--Information About Gopher (FILE) About Gopher (?) Search Gopher News> (DIR) Gopher News Archive (DIR) Gopher Software Distribution (DIR) Commercial Gopher Software (DIR) Gopher Protocol Information (FILE) University of Minnesota Gopher software licensing policy (FILE) Frequently Asked Questions (DIR) comp.infosystems.gopher (USENET newsgroup) (FILE) Adding Information to Gopher Hotel (MOV) Gopher T shirt on MTV movie (big) (MOV) Gopher T shirt on MTV movie (small) (IMG) Gopher T-shirt on MTV #1 (IMG) Gopher T-shirt on MTV #2

The World Wide Web is zA software application, most often running on the Internet (but not required to be) using a client – server protocol for communications.

What makes the Web Unique? Hyperlinks !!! zHyperlinks (the ability to move from one source to another in a webbed environment) are the primary reason why the Web is so popular (and navigable). zHyperlinks are examples of “associative trails” (Vannevar Bush 1945 )

So what is “client-server”? zClient-server itself is a software application that supports connectivity and functionality between users (running “client software applications”) and hosts, or servers running server-side software. zSometimes we call this design philosophy an “Open Systems” design, since it supports multiple H/S platforms.

Top Level Domains zOriginal TLDs -.edu,.gov,.com,.mil,.net,.org,.us zNew TLDs -.aero,.biz,.coop,.info,.musuem,.name, &.pro

Hostnames and the Domain Name Server (DNS)  Every host (aka system or computer) on the Internet requires a unique identification number, a numeric address  The Internet requires this number to get data from a source to a destination address  The number is built up of 4 numbers, each between 0 and 255 (aka, 4 bytes total)  For every hostname, such as sislt.missouri.edu, there is a numeric equivalent ( ).

Hostnames and the DNS  We don't need to know an IP address for a particular hostname, or need to worry about how the data get from one place to another.  Experts, though, need to get behind the scenes to diagnose problems or errors.  Some utilities available include ping, traceroute, nslookup and whois. These are available for Unix/Linux and Windows machines, among others. (check out and dnsstuff.com)

Internet Protocols:TCP and IP  Protocols are rules for communication. By agreeing on such rules, the Internet works.  Many protocols are used for the Internet to make sure data get from one place to another. For example, the HyperText Transport Protocol (HTTP) governs how Web clients (browsers) talk with Web servers.  The defining protocol for the Internet is the TCP/IP protocol.

Internet Protocol  The Internet is the network of IP networks. TCP/IP—transmission protocol  IP (Internet protocol) is a protocol that manages getting data packets from one place to the other on the Internet regardless of hardware and software. The IP doesn't do any quality control or error handling, other than to make sure the payload arrives intact.  TCP (transmission control protocol) does quality control, packet reassembly, and other things to make sure the data are usable.

Important Internet Websites zhttp:// yWorld Wide Web Consortium zhttp:// yInternet Society

How you (& others) use Internet zhttp:// yPEW zhttp:// yCouncil on Library and Information Resources

Information Overload z“The greatest problem of today is how to teach people to ignore the irrelevant, how to refuse to know things, before they are suffocated. For too many facts are as bad as none at all.” z(W. H. Auden)

Information Hierarchy Wisdom Knowledge Information Data

Information Hierarchy zData yRaw material of information zInformation yData organized & presented by someone zKnowledge yInformation read/hear/seen AND understood zWisdom yDistilled & integrated knowledge AND understanding

Information Retrieval Issues zHelp users retrieve information relevant to their information needs--esp. in a Web world yFind techniques that allow higher quality retrieval-- text, image, sound zFaster access yFind techniques to improve indexing & efficiency zUnderstanding of user behavior yFind better ways to design & deploy IR systems and strategies

Effective Information Retrieval zUnderstanding the documents & data yHow to structure, store and retrieve yRoles of good indexing, keywords, full-text yAutomatic (crawl) and human intervention retrieval zStandards

Effective Information Retrieval zUnderstanding the vocabulary--relevant, precise, stemming (your vocab list) zBoolean searching yhttp://lib.colostate.edu/tutorials/booleanadv_info.htmlhttp://lib.colostate.edu/tutorials/booleanadv_info.html zMore Boolean yNesting & Proximity Operators--Adjacent, Near zSometimes +, -, or “” better (implied Boolean) zDon’t forget the user is NOT you

Let’s Practice zGo to Blackboard zReview Electronic Resource zSample zOn your own