Please answer all of the following questions in the picture. Thanks!

1. What is the purpose of tier-1 and tier-2 ISPs? What is the purpose of ac- cess ISPs? 2. What is the 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 r2d2.compsc.nowhereu.edu) similar to a tradi- tional 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. 6. Why is SSH considered superior to telnet? 7. In what way do the P2P and multicast approaches to Internet radio broadcast differ from N-unicast? 8. What criteria should one consider when choosing one of the four types of VoIP