IP & Domain Name (II)

Because so much IP numbers have to remember, someone invented a techology to get them easily: DNS.
DNS is "Domain Name System" or "Domain Name Service".

Just like human society, everyone have a unique ID number. You can take it as IP number. And everyone maybe have English Name, Chinese Name, Nickname, or something be called. You can take it as Domain Name. DNS is invented for remembering easily.

For Example: www.ibm.com

"www" means "World Wild Web".
"ibm" means that service is belonged to IBM.
"com" means it is one of companies.

For Example II: bbs.ntnu.edu.tw
"bbs" means " Bulletin Board System".
"ntnu" means "National Taiwan Normal Univerity".
"edu" means "EDUcation".
"tw" means "TaiWan".

We can tell what character it is and it's country ......just from it's "Domain Name". Sometimes we can guess sites' URL like Whitehouse, Sony, Mac or Microsoft....

HW: guess Micrsoft 's URL