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It s much more important to spend time making considered design decisions based upon a solid research foundation than to test a half-baked design created without the benefit of clear, compelling models of the target users and their goals and needs..

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*B:PE1>config>router# interface toPE2 *B:PE1>config>router>if$ address 140.10.0.97/30 *B:PE1>config>router>if$ port 1/1/2 *B:PE1>config>router>if$ exit *B:PE1>config>router# interface toCE1 *B:PE1>config>router>if$ address 140.10.0.101/30 *B:PE1>config>router>if$ port 1/1/1 *B:PE1>config>router>if$ exit *B:PE1>config>router# show router interface ============================================================ Interface Table (Router: Base) ============================================================ Interface-Name Adm Opr(v4/v6) Mode Port/SapId IP-Address PfxState -----------------------------------------------------------loopbackTest Up Up/-Network loopback 140.10.0.11/32 n/a system Up Up/-Network system 140.10.0.1/32 n/a toCE1 Up Down/-Network 1/1/1 140.10.0.101/30 n/a

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In his 1993 book Usability Engineering, Jakob Nielsen distinguished between summative evaluations, which are tests of completed products, and formative evaluations, conducted during design as part of an iterative process This is an important distinction Summative evaluations are used in product comparisons, to identify problems prior to a redesign, and to investigate the causes of product returns and requests for training and support Summative studies are generally conducted and thoroughly documented by professional, third-party evaluators In some cases, particularly in competitive product comparisons, summative studies are designed to yield quantitative data that can be tested for statistical significance Unfortunately, summative evaluations are often used as part of the quality assurance process near the end of the development process At this point, it s usually too late to make meaningful design changes; that train has left the station.

If an application requires reliable transfer of its data across the network, it will use TCP to obtain that service. TCP is responsible for ensuring that all data is received and sent to the receiving application in the order in which it was sent. This means that TCP will order the data for the application, even if the data arrives out of order. Since TCP ensures delivery even if some packets are dropped, it will wait to receive missing data before passing it to the upper-layer application. This technique is known as positive acknowledgement with re-transmission because TCP actively acknowledges only the data that was actually received; it does not request information that has not been received. It is up to the sender to notice out-of-order or duplicate acknowledgements and re-send missing data. each segment that is sent by TCP has an identifying sequence number transmitted in the TCP header. This sequence number indicates the number of the first byte of data

Design should be evaluated before the coding begins (or at least early enough that there is time to change the implementation as designs are adjusted) However, if you need to convince stakeholders or programmers that there is a usability problem with the current product, nothing beats watching real users struggle through basic tasks Formative evaluations do just this These quick, qualitative tests are conducted during the design process, generally during the Refinement phase When effectively devised and moderated, a formative evaluation opens a window to the user s mind, allowing the designers to see how their target audience responds to the information and tools they ve provided to help them accomplish their tasks Though summative evaluations have their uses, they are product- and programmanagement activities conducted to inform product lifecycle planning.

in the overall data stream for this connection. The receiver acknowledges receipt of this data by transmitting an acknowledgement number that indicates the next byte of data in the stream that the receiver expects to receive. If some of the data is lost, the receiver will continue to send the same acknowledgement number that indicates the bytes that were received successfully. The sender maintains a re-transmission timer. If the sender does not receive an acknowledgement for some bytes of data that were sent, the data will be re-transmitted when the re-transmission timer expires. Because the TCP segments are transmitted over an unreliable network service (IP network), the segments may arrive at the destination in a different order from that in which they were originally sent. The sequence numbers are used by the receiver to reconstruct the data stream and ensure that the data is provided to the application in the same order that the data was sent. Figure 7.5 illustrates an example of a TCP conversation when data is lost during the conversation.

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