s8 - CSE/EE 362 Asst. 8 Solution Spring 2009 Problem 1.Text...

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CSE/EE 362 Asst. 8 Solution Spring 2009 Problem 1 .Text Problem 4.32. Two reasons why networks might use an error-correcting code instead of error detection. .32 Solution. 1. If no feedback is possible, or if real time operation does not allow the variable delay of feedback, then it may be worth using error correction to reduce the fraction of erroneous packets. For example, a rare error in voice or video communication usually can be tolerated, but frequent errors are bad. 2. If retransmission is possible, it can still be beneficial to use error correction so that the frequency of retransmission requests is less. Problem 2 .Text 4.38. One consequence of using a spanning tree to forward frames in an extended LAN is that some bridges may not participate at all in forwarding frames. Identify thre such bridges in Figure 4-44. Is there any reason for keeping these bridges, even though they are not used for forwarding? Solution. Bridges G and I are not used at all. The part of bridge J that connects to LAN 7
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This note was uploaded on 09/23/2009 for the course CMPEN 362 taught by Professor Johnmetzner during the Spring '09 term at Pennsylvania State University, University Park.

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s8 - CSE/EE 362 Asst. 8 Solution Spring 2009 Problem 1.Text...

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