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problem 1: Consider a 100 meter 100 Mb/s Ethernet link transporting 1500 byte frames. Determine the transmission delay for a frame? What is the approximate propagation delay of this link? Which delay dominates for this link?

problem 2: Consider a buffer with 100 packets queued; each packet is 1500 bytes in length. The buffer is for an intermediate node with a 100 Mb/s egress (output) link with no throttling. How long will it take for all the packets to be transmitted (that is, for the buffer to empty out)?

problem 3: It is around 2500 miles to Seattle from here. Is the round-trip-time from here to Seattle and back (supposing no queuing delays) greater or less than the human perception threshold?

problem 4: An application layer protocol usually defines four things. What are such four things?

problem 5: What are ping and traceroute used for? describe the output from each program.

problem 6: What is a web cache used for (that is, what benefits are derived from using a web cache)? Where can a web cache be positioned or placed?

problem 7: What are DNS and what is it used for? If all DNS servers could be crashed (taken offline) what would happen to the Internet.

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