How long does it take to transmit a 1200KB file over a link with a bandwidth of
4096 Kbs, assuming zero latency? Show your work.
2. Imagine that you have trained your St. Bernard dog, Bernie, to carry a box of three 8mm tapes instead of a flask of brandy. (When your disk fills up, you consider that an emergency.) These tapes each contain 7 gigabytes. The dog can travel to your site, wherever you may be, at 18 km/hour. For what range of distances does Bernie have a higher data rate than a transmission line whose data rate (excluding overhead) is 150 Mbps? Show your work.
3. Consider the following method for computing a checksum of a text message: convert the text characters to integers based on their ASCII encoding. Add all of the integers modulo 100 – i.e., divide the sum by 100 and take the remainder.
a) What is the checksum for the string “Cat”? (without the quotes – the case of the letters is significant.)
b) Provide an example of a string with a checksum of 78.
4. Assume there are two computers on a network, and they each want to send a big file to the other one. Would half-duplex or full-duplex communication be faster?
Explain your answer.
5. If the unit exchanged at the data link level is called a frame and the unit exchanged at the network level is called a packet, do frames encapsulate packets or do packets encapsulate frames? Explain your answer.
6. Suppose you come up with an idea to run a commercial pornographic web site from your WOU computer account. Your plan is to get content from other web sites and edit the site on-campus using the web tools (e.g., Dreamweaver) in the labs. You figure the campus’s mail server can handle lots of outgoing email (i.e., spam). Based on the Acceptable Use Policy (AUP) for the campus: http://www.wou.edu/policy/36
list as many problems as you can think of. Start with items that are specifically forbidden by the AUP and cite the specific clauses in the AUP. You should also list reasons that you think this business would be forbidden even though you can’t find a specific prohibition. In those cases, cite clauses that imply prohibition or sections where you think the AUP should specifically forbid the practice.
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