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Of course, this presupposes that the students are actually going to get their test papers back, or at least see them Some schools keep test papers so that students can t sell them on and help others to cheat, but they should at least have a chance to see their errors For the sake of time you can just tick or cross questions Ticks and crosses aren t common to every culture so let students know what each symbol means Use a marking code for longer answers, if your students are used to one Highlight a grammar error by writing gr or sp for spelling This helps them to see what kind of errors they typically make and gives them an opportunity to try correcting the problem themselves 7 has more on marking corrections For straightforward questions you can allow students to mark each other s work.

Ultimately, QoS is something experienced by the user Many QoS parameterizations therefore quantify QoS on this basis On the other hand, what is technically more tangible is a parameterization on the network level, and this is what we resort to in this book QoS is normally delivered to something known as a ow A ow is a stream of packets having some header characteristics in common, eg the same source and destination IP address and the same source and destination transport level port In other words, packets belonging to the same application often belong to the same ow, eg the packets of a Voice over IP application All packets belonging to a ow will receive the same QoS A single application can, however, also generate several ows, eg.

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a video streaming application could generate one ow for the actual video stream and one for the accompanying audio stream Each may need a different QoS Almost all QoS parameterizations contain the parameter bandwidth Given enough bandwidth, any application will play with good quality Looking at it closely, however, the bandwidth parameter reveals greater complexity Because data travels in packets, bandwidth is used in chunks rather than continuously Bandwidth is therefore always an averaged quantity Many parameterizations use the overall average bandwidth to describe the desired QoS for a ow For applications with oscillating bandwidth demands the maximum or peak bandwidth is also of interest Of course, average bandwidth and peak bandwidth together do not provide a complete description of the bandwidth needs For example, it is not yet speci ed how frequently the peak bandwidth is needed Figure 14.

You need to be careful about cheating though, so you should insist that everyone puts their own pens away and then give everyone a pen in a special colour Having their work reviewed by another student can be embarrassing for some students so you need to be quite careful about sharing out this task Get to know your students work and their personalities before trying this method It s good to have a class feedback session about the test if possible When you do that, you tackle the tricky questions that everyone got wrong After all, it may be your fault because you didn t teach that topic thoroughly, or because the test question wasn t clear You now have the chance to make up for it by re-teaching the point For students individual errors you can employ peer correction, which means the students correct each other..

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1 illustrates the momentaneous bandwidth of two rather different ows (obviously, even the momentaneous bandwidth is calculated by averaging over some small time interval), although both ows have the same average and peak bandwidth An alternative to the description by bandwidth parameters is a description with the token bucket, which allows one to describe also the burstiness of a ow [Tanenbaum 2002] For real-time applications, furthermore, the delay a packet accumulates as it travels through the network is an important parameter For example, in a phone conversation a round trip delay greater than 400 ms becomes noticeable Another important quantity is the variance of the delay, which is also called jitter The constant delay of all packets might just be tolerable for a phone conversation A great variance of delay, however, would have to be compensated by a buffer in the receiving phone, effectively adding more delay.

A C K (a) Medium Access Busy Delay P H Y S F 1 M S D U 1 P A D 1 A-MSDU M P S A D D U n n SIFS Access Delay