450_SampleQuestions_6_solutions

450_SampleQuestions_6_solutions - EE 450 Sample Questions 6...

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1 EE 450 Sample Questions 6 Solutions Summer ’09 Nazarian 1. a. IP and UDP are both connectionless and unreliable protocols. The main difference in their reliability is that IP only calculates a checksum for the IP header and not for the data while UDP calculates a checksum for the entire datagram. b. Port addresses do not need to be universally unique as long as each IP address/port address pair uniquely identifies a particular process running on a particular host. A good example would be a network consisting of 50 hosts, each running echo server software. Each server uses the well known port number 7, but the IP address, together with the port number of 7, uniquely identify a particular server program on a particular host. Port addresses are shorter than IP addresses because their domain, a single system, is smaller than the domain of IP addresses, all systems on the Internet. c. The minimum size of a UDP datagram is 8 bytes at the transport layer and 28 bytes at the
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450_SampleQuestions_6_solutions - EE 450 Sample Questions 6...

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