hw2 - CSCI5211: Computer Networks Homework Assignment 2 Due...

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Unformatted text preview: CSCI5211: Computer Networks Homework Assignment 2 Due Friday 11:59pm Oct 16, 2009 Important Notes: Please submit your homework using the on-line electronic submission system on the class website: http://www.itlabs.umn.edu/classes/Fall-2009/csci5211/submit.html In case you could not use the on-line electronic submission system, please hand in to the TA or instructor on the due day. Please use the on-line electronic submission to register first. (To ensure end-to-end reliability, please retain a copy of your homework assignment!) 1. Name Resolution, DNS and DHT a. In todays DNS, each host must be configured with a local DNS server for host name resolution, and all DNS queries are performed by the local DNS server on behalf of the end host. What are the major advantages of such an approach? What is the major disadvantage of such an approach? How could such disadvantage be mitigated? b. Briefly discuss the pros and cons of using dynamic hash table (DHT) techniques to implement the domain name system instead of the hierarchically distributed mechanism used in todays DNS. 2. Medium Access Control, Ethernet and CSMA/CD a. Briefly explain why 10Base Ethernet imposes a minimum frame size constraint (i.e., 64 bytes). What is the minimum frame size constraint for 100Base Ethernet (Fast Ethernet)? What are the implications of the minimum frame size contraint on the evolution of Ethernet, namely, as its speed is increased? b. Briefly explain why in a 10Base Ethernet a station can be certain that a data frame is successfully transmitted without collision if no collision is detected during the transmission of the first 64 bytes of data....
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hw2 - CSCI5211: Computer Networks Homework Assignment 2 Due...

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