1. Computer Networks Fall, 2007 Prof Peterson

2. CIS 235: Networks Fall, 2007 Western State College How’s it going??

3. CIS 235: Networks Fall, 2007 Western State College  How does SMTP figure out who your mail agent is?  What sort of information is encoded in an email header? What does a mail client do? What sort of things do IMAP / POP deal with?

4. CIS 235: Networks Fall, 2007 Western State College  How do we encode email?  What is “base64”?  What sort of authentication happens during email transmission?  How do spammers hide their identity?  How do we block spam?  What can’t be forged in an email?

5. CIS 235: Networks Fall, 2007 Western State College What is the purpose of DNS service? Why is the security of DNS so important? What does a DNS server do? What is a canonical hostname? When do you see them? What does an MX record do? Who uses it? What is load distribution? What does Akamai do?

6. CIS 235: Networks Fall, 2007 Western State College  Why is DNS so hard?  What is a “Root Server”? How many are there?  What is a TLD? A TLD server?  What is an authoritative server?  What is a local server?  What is the difference between a recursive and iterative query?

7. CIS 235: Networks Fall, 2007 Western State College  What are Resource Records?  What is a type “A” record for?  What is a type “NS” record for?  What is a type “CNAME” record for?  Why can a query carry more than one question?  What is “nslookup”?  Who manages the DNS database?

8. CIS 235: Networks Fall, 2007 Western State College  What is the TTL used for?  How does DNS caching work?  How would you move a domain from one computer to another?  How does you computer know where to get DNS service?  What’s a subdomain?

9. CIS 235: Networks Fall, 2007 Western State College  Check out DIG – a unix tool for domain queries (http://en.wikipedia.org/wiki/Domain_In formation_Groper)http://en.wikipedia.org/wiki/Domain_In formation_Groper

10. CIS 235: Networks Fall, 2007 Western State College  What are the basic design issues in a P2P network?