It is assumed that there are at least 40 packets buffered in the queue to be sent out by the sender, the network is stable (i. e., the propagation time between the sender and the server is roughly the same for every data packet and ack if it is not lost), the total transmission delay of 3 data packets are much smaller than RTT, 8-bit sequence numbers are used, window size N = 3, and initial send_base = 15.

Draw a diagram similar to PPT slide 21 titled "GBN in action" of Chapter 3 for the Go-Back-N approach to illustrate the interaction between the sender and the receiver between the moment when pkt15 is sent the first time by the sender and the moment when pkt21 is sent out the first time by the sender. During the interaction, only three abnormal events occur: pkt16 is lost on the way when it is sent to the receiver the FIRST time, the timer for pkt16 expires after ack#15 is received by the sender the SECOND time, and ack17 is lost on the way when it is sent to the sender the FIRST time. Please include all the details as given in PPT slide 21 in your diagram.

What are the values of send_base, nextseqnum, and N in this particular case?

My favorite is "be concise."have you ever received an email and had to read a page full of information? by the time you finished reading it, you had to re-read it? i have even hit "reply" so that i could break it down into separate paragraphs and send it back to myself.what is concise? get to the point, fast. when opening an email like this, some will close it or print it to read later.i learned to use the subject line to prepare the reader for content. such as, "need on (blank), " "info only re: (blank)," "request input on (blank)," "read before (blank) meeting." these are just some.if you are asking for something, make that your first sentence. follow this by who, what, when, where, and how. use these, as necessary. example; (1) who (who needs it and or who does it), (2) what (specific description of what is needed), (3) when (specific, i need this by 8: 00 am monday or i need this by 10: 00 am today), (4) where (does it have to be printed and taken to someone, maybe the place of the meeting), (5) how (i need it scanned or faxed back to me at this email address, provide me with a hard copy).do not send yet. re-read it. did some spell check change a word? maybe let someone else read it for understanding. you want to avoid multiple emails asking for clarification. if important, put a read receipt on it. you will know it was opened, not necessarily read.end with a you.

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