LIS4361 Week 1 Notes
1. Everything in on the Internet2. The Internet contains nothing but trash.3. Anything on the Web is findable4. Search engines search the entire Web.5. The Internet is the Web.
1. Web page just posted and spiders haven’t indexed it yet.2. URL expired.3. Web page inadequately indexed by search engines.4. Bot blocker in effect.5. Site not completely indexed.6. Problems with alpha or numeric address.7. Site is a dynamic site: permanent Web page does not exist, but is generated “on the fly.”8. The URL is case sensitive.
Hobbe's Internet Timeline Study the history of the Internet.See also book in Penrose (and Prospector): History of the Internet : a chronology, 1843 to the presentTed Nelson and Xanadu: http://jefferson.village.virginia.edu/elab/hfl0155.htmlProject Xanadu: http://xanadu.com/
Internet addresses consist of many parts. Most important is the top level domain. You are all familiar with "dot coms" - .com. But there are many more top level Internet domains such as .edu (du.edu), gov for US government sites, org for organizations, etc. There are hundredes of top level domains, each administered by an authoritative agency.
Background: http://www.yale.edu/pclt/COMM/TCPIP.HTMW3C: http://www.w3.org/
Address Assignment
|
Alpha |
Numeric |
| Now flips to: http://buddhism.lib.ntu.edu.tw/ |
http://140.112.2.89/
(2006) |
|
http://128.146.9.101
(2005) |
What is the relationship of the following to each other?
http://www.insidedenver.com/ | http://www.rockymountainnews.com/
http://130.253.4.23 | http://bianca.penlib.du.edu/ | http://catalog.du.edu/ | http://peak.du.edu/
Note: the DU catalog was formerly at: http://130.253.32.83 - But this no longer exists
secondary
file file
domain
directory name type
|
|
sub | |
transfer
| top
| dir- | |
protocol
| level | ectory
| |
|
| domain|
|
| |
|
|
| |
| | |
http://www.census.gov/acsd/www/sub_p.htm
Webmaster Toolkit: http://www.webmaster-toolkit.com/
Nslookup: Translate from alpha address to numeric IP, and vice versa.
Can you find other nslookup sites? [see also DNSstuff below]
WhoIs: Find out who a domain is registered to and contact info.
http://www.networksolutions.com/cgi-bin/whois/whois (note that this URL flips to a different URL)
Top-level Domains (TLDs): Find out Internet domains for every country of the world.
http://en.wikipedia.org/wiki/Top_level_domains AND http://en.wikipedia.org/wiki/List_of_Internet_top-level_domains
http://www.uninett.no/navn/domreg.html [What is going on with this URL? How can you prove it?]
Traceroute: Find the Internet route from one IP address to other addresses throughout the world. See how many "hops" are involved in connections.
http://visualroute.visualware.com/ Try this on your own: requires free registration.
DNSstuff: http://www.dnsstuff.com/ Provides a search form for WhoIs, Traceroute, and IP address lookup
Speed Test http://www.speedtest.net/
If you were looking for information from Norway on fishing, you could search Google this way: site:no fishing. If wanted a Chinese perspective on the summer Olympics, you could search like this: olympics site:cn
You can also search using secondary domain information. US government sites are .gov, but state department sites are state.gov. Thus, to find out about treaties from the State Department, search: site:state.gov treaties.