week7ilab - Jonathan Sullivan NETW310, Professor’s Name...

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Unformatted text preview: Jonathan Sullivan NETW310, Professor’s Name 02/21/10 Lab #7, Network Error Control Lab Report a 1. Given the configuration of the Packet Discarder, write a short paragraph explaining why the server’s Congestion Window size has this variation. Paste a copy of this window into your answer. When finished, hide or delete the panel. (8 points) Basically, the congestion window size is determined by the number of packet losses. So in other words the congestion window controls the startup and limits in the face of loss. The window gets larger after every new acknowledgement. Whereas the windows gets smaller whenever loss is detected. 2. Examine the statistics for the —2. Examine the statistics for the client node. Have the packet drops affected anything on the client that you can tell? (8 points) Yes, of course the client has definitely been affected by the dropping of the packets across the network. — 3. Examine the Delay stats for the entire network (Global) and for the nodes. Can you 3. Examine the see any delay caused by these drops? (8 points) Yes, there is a fairly large amount of delay throughout the entire network. 4. Copy this window to your answer sheet and, in a short paragraph, explain why the 4. Copy this window to your answer sheet and, in a short paragraph, explain why the congestion window sizes are different in the two scenarios. (8 points) The congestion window sizes are very different because, the window gets larger after every new acknowledgement. Whereas, the window will get smaller whenever loss or dropped packet is detected. 5. Unselect . 5. Do —5. Unselect Server congestion window and then select Server Flight Size. Show and zoom the window as done previously. Copy this window to your lab report and, in a short paragraph, explain why the Server Flight sizes are different in the two scenarios. (8 points) The flight size is different because, flight size is the amount of data that has been sent but not yet acknowledged. So, since flight size is the amount of outstanding data in the network the dropped packets that are occurring here and there are what I believe that’s causing the slight differential that you are seeing. 6. In a short paragraph, summarize your overall findings in regard to what happens in —6. In a short paragraph, summarize your overall findings in regard to what happens in Flow Control and how Error Control can affect it. This was a very limited demonstration so explain briefly how you might project these results onto a large and active network and what problems might arise. (10 points) I learned that there is a critical need for error control as well as flow control they are what is responsible for keeping the number of packets within the network below a level acceptable for performance and to recover potential frame errors. Depending on the number of errors that occur on the network you’re going to have an increased amount of traffic out on the network due to all of the re­ transmissions. But, this is where flow control comes in to help regulate the traffic in order to prevent the sender from overflowing the buffers of the receiver. ...
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