HW2 - IT 420 Spring 2011 Homework 2 Won-chul Song 1. Answer...

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IT 420 Spring 2011 Homework 2 Won-chul Song 1. Answer questions 4.10, 4.12 and 4.27 on page 80 of the textbook. For this homework only, I will provide the questions because some students may still not have the textbook. 4.10 Describe the steps a browser takes to determine whether to use an item from its cache. The browser saves the Last-modified date information along with the cached copy. Then browser uses a HEAD request to retrieve only the headers that includes the last-modified field. If cached copy is out of date and there is new information to be updated, then browser gets the new copy. 4.12 When a user requests an FTP directory listing, how many TCP connections are formed? Explain. FTP uses two TCP connections, one for control information and one for the actual data. 4.27 True or false: A DNS server can return a different IP address for a given name, depending on whether the lookup specifies email or web service. Explain. True. IP address is considered as a hostname of authoritative name server for DNS, name
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This note was uploaded on 03/28/2012 for the course IT 420, 245 taught by Professor Kattering during the Spring '12 term at NJIT.

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HW2 - IT 420 Spring 2011 Homework 2 Won-chul Song 1. Answer...

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