internet publishing and network topology the internet yahoo.com to the rest of the internet ...
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Internet Publishing and Network Topology
The Internet
yahoo.com
to the rest of the Internet
to th
e re
st o
f the
Int
erne
tto the rest of the Internet
http://www.starsearch.com/celebs/3dbang.htm
3dbang.htm“web root”
www.starsearch.com
youngschool.youngtown.org
Internet and Intranets• The Internet - Everything everywhere• Intranet - A private group of computers
– Also known as a “local area network” (LAN)– Connected to the main Internet by one or more “gateway” computers– Examples:
• The computers belonging to a single town & district(youngtown.org, uconn.edu)
• Computers of a single business (hitech.com, yahoo.com, generalelectric.com, etc.)
• Computers belonging to part of the government (whitehouse.gov),
to Internet
intranet
gateway other computers in the intranet
hs.youngtown.org
www.youngtown.org(i.e., town public web site)
youngschool.youngtown.org
k6.youngtown.orgThe youngtown.orgIntranet
uconn.edu
Dark gray clusters comprisethe totality of the Young Town intranet.
Intranet - A restricted part of the Internet
classrooms
gateway computer- Bottlenecks all network activity between the Internet and local network- Can filter illicit access- Protects against outside hacking (“firewall”)- Allows legitimate in-bound access (“proxy server”)
to/from the Internet
intranet
computer lab
youngschool.youngtown.orgonly local userscan access other computers on the intranet
Local Server(s)
local server machine- Can provide specialized local services * Local web server * Network file server * FTP server (file transfer protocol)-May or may not exist on any given intranet
youngschool.youngtown.org
to/from the Internet
intranet
computer lab
classrooms
A Local Web Server
www.youngschool.youngtown.org
to/from the Internet
“web root”
http://www.youngschool.youngtown.org/students/portfolios/jsmith/
- Can be set up to be only locally accessible, depending on local preferences
File Servers and File Sharing
uconn.edu
- Hard disk on a remote machine is treated as if it were actually attached directly to the local computer.- Allows uploading and downloading files to servers.- On PC’s browse My Network Places, Network Neighborhood, or Find Computer- On Mac’s use Chooser and AppleShare (Mac OS 9) or “Connect to Computer” menu command (Mac OS X)
hs.youngtown.org
www.youngtown.org(i.e., town public web site)
www.youngschool.youngtown.org(private - inside firewall only)
k6.youngtown.org
Publishing to theIntranet versus Internet
W
X
uconn.edu