UNIX for Dummies Questions & Answers

Hi everyone,

I am very new to linux. Can anybody help me for my following doubts.

1) Why we put 8080 in squid server configuration ?
2) what is secure and insecure ftp ?
3) difference between ftp and http servers ?
4) can we configure all servers (installing packages with yum client)if we dont have a network.
5) what happend when we hit www.google.com in address bar? (means how dns works)
6) what happend when we send a mail within a network and accross a network ? (means how mail server works).

thanks in advance...

looking forward to hear from you....

This is how I would answer that first three questions:
1) Because it's easy to remember and because it's pseudo-standard. Squid's default port is 3128.
2) Using secure FTP the data is partially tunneled through SSH, namely the authentication of the client on the server and changing/listing of directories.
3) FTP is almost exclusively meant for file transfer(s), HTTP is mainly meant for loading webpages from WWW to browser.

thanks......

i think this will answer your question about "How does DNS work"

http://cr.yp.to/djbdns/intro-dns.html

check the site out it has your answer