1. Welcome to CIS 235 Computer Networks Fall, 2007 Prof Peterson

2. CIS 235: Networks Fall, 2007 Western State College Homework We’ll have two assignments this week: Cleanup of the previous one – I have placed comments in the wiki telling you what to do A short programming task that will help you get started on the real programming assignment next week Both are due next Monday (take Friday off!)

3. CIS 235: Networks Fall, 2007 Western State College Cleaning up your Homework … All of you need to be fleshing things out more – more details, not just 1 line for each fact, references. Some of you need to figure out how to capture the necessary traffic! If you have traffic in your writeup, explain how you captured it. Edit the traffic down to specific bits that illustrate some aspect of your protocol.

4. CIS 235: Networks Fall, 2007 Western State College The Next Test We’ll do a chapter 2 test next Wednesday (24 th ). The programming aspect of the chapter won’t be covered on the test – just the homework. Everything in the wiki from the homework is fair game – look at what everyone has written! As usual, 1 page of notes.

5. CIS 235: Networks Fall, 2007 Western State College Programming We’re going to be covering Java programming this week. There will be a small homework in the Wiki by tomorrow – this is meant to get you back into Java land. I’ll be using NetBeans in class. If you haven’t used NetBeans, make sure you spend time asking questions! You will have a choice between an extended programming project and a research paper + easy programming project. I’ll be assigning you topics if you choose the paper.

6. CIS 235: Networks Fall, 2007 Western State College The World’s Biggest Database What is load distribution? What does Akamai do? Why is DNS so hard? 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 DNS Records 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 DNS Issues 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?