7. Suppose Host-A has opened a TCP connection with Host-B. The current MSS is 576 Bytes. The application layer at Host-A wishes to transmit a file that is 256MB in size. How many TCP segments will have to be transmitted to transport the 256MB file completely to Host-B? 8. The DNS system uses a tiered hierarchy. What are the three levels of the DNS hierarchy. Describe what each part does. Give an example using the domain www.unomaha.edu. 9. What purpose does a CDN serve? (be thoughtful and comprehensive with your answer using information from the Lectures, book and slides---do not Google-copy-paste!) 10. True/false: All routers at the Network core operate up to Layer 2 (the Link Layer)