1) If the DNS system is working normally, can the same domain name have two IP numbers in the DNS system?



2) Suppose I want to translate the hostname www.pinterest.com to an IP number.  I have NOTHING cached.  Where do I send the first DNS packet?



3) What is a DNS resolver?



4) About how many top level domains are there, not counting the country codes?  



5) What is a reverse DNS lookup?



6) How does your personal laptop find the IP number of the computer to use as a DNS name server?



7) Where is the single master root of the DNS system stored?  Which city?



8) I want to resolve www.education.yahoo.com?  How many packets are sent by your personal laptop in practice?



9) Does the last line print if I run this code?
    read(bad_file_descriptor, buffer, 10);
    perror("Bad file descriptor");
    cout << "Does this line print?"