1. What is the purpose of tier-1 and tier-2 ISPs? What is the purpose of access ISPs? 2. What is DNS? 3. What bit pattern is represented by 3.6.9 in dotted decimal notation? Express the bit pattern...

1.
What is the purpose of tier-1 and tier-2 ISPs? What is the purpose of access ISPs?

2.
What is DNS?

3.
What bit pattern is represented by 3.6.9 in dotted decimal notation? Express the bit pattern 0001010100011100 using dotted decimal notation.

4.
In what way is the structure of a mnemonic address of a computer on the Internet (such as overthruster.propulsion.yoyodyne.com) similar to a traditional postal address? Does this same structure occur in IP addresses?

5.
Name three types of servers found on the Internet and tell what each does.