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Conversely, a simple text field can accept any alphanumeric data a user keys into it. This open-ended entry idiom is an example of an unbounded entry control. With an unbounded entry control, it is easy for users to enter invalid values. The program may subsequently reject it, of course, but users can still enter it. Simply put, bounded controls should be used wherever bounded values are needed. If the program needs a number between 7 and 35, presenting users with a control that accepts any numeric value from 1,000,000 to +1,000,000 is not doing anyone any favors. People would much rather be presented with a control that embodies 7 as its bottom limit and 35 as its upper limit (clearly indicating these limits is also useful). Users are smart, and they will immediately comprehend and respect the limits of their sandbox. It is important to understand that we mean a quality of the entry control and not of the data. To be a bounded control, it needs to clearly communicate, preferably visually, the acceptable data boundaries to the user. A text field that rejects a user s input after he has entered it is not a bounded control. It is simply a rude control.

64 bytes from 192.168.0.4: icmp_seq=5 ttl=64 time<10ms. ---- 192.168.0.4 PING Statistics ---5 packets transmitted, 5 packets received, 0.00% packet loss round-trip min < 10ms, avg < 10ms, max < 10ms, stddev < 10ms *A:CE1#

call from the Networkstack component. The query interface for the declarative part of the ATaG program is used by the Dispatcher component.

*A:CE1# traceroute 192.168.0.4 traceroute to 192.168.0.4, 30 hops max, 40 byte packets 1 192.168.0.4 (192.168.0.4) <10 ms <10 ms <10 ms *A:CE1#

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Most quantitative values needed by software are bounded, yet many programs allow unbounded entry with numeric fields. When a user inadvertently enters a value that the program cannot accept, the program issues an error message box. This is cruelly teasing the user with possibilities that aren t. What would you like for dessert We ve got everything, we say. Ice cream, you respond. Sorry, we don t have any, we say. How about pie you innocently ask. Nope, we say. Cookies Nope. Candy Nope. Chocolate Nope. What, then you scream in anger and frustration. Don t get mad, we say indignantly. We have plenty of fruit compote. This is how users feel when we put up a dialog box with an unbounded edit field when the valid values are bounded. A user types 17, and we reward this innocent entry with an error message box that says You can only enter values between 4 and 8. This is poor userinterface design; a much better scheme is to use a bounded control that automatically limits the input to 4, 5, 6, 7, or 8. If the bounded set of choices is composed of text rather than numbers, you can still use a slider of some type, or a combo box, or list box. Figure 21-15 shows a bounded slider used by Microsoft in the Windows Display Settings dialog. It works like a slider or scrollbar, but has four discrete positions that represent distinct resolution settings. Microsoft could easily have used a noneditable combo box in its place, too. In many cases, a slider is a nice choice because it telegraphs the range of valid entries. A combo box isn t much smaller but it keeps its cards hidden until clicked a less friendly stance.

1a. How many routers does CE1 see between itself and Device4 1b. Does CE1 see the connection to Device4 as routed or switched (at Layer 2) Explain your answer. 2. On CE1 or Device1, try to ping any of the interfaces on PE1 or PE2. 2a. Are any PE interfaces reachable 3. (Optional) If Device4 has OSPF configured, check the adjacencies and LSA database on CE1 and Device4. (Refer to Lab Section 9.1 in 9.) 3a. How many OSPF adjacencies are there on each CE device 3b. Are there any adjacencies with, or LSAs from, the PE routers 3c. From CE1, which system interfaces can you ping PE1 PE2 Device4 3d. Explain the results. 3e. Are the OSPF sessions on the CE devices connected in any way to the OSPF sessions on the PE devices 4. On one of the PE devices, shut down the SDP to the other PE device. Repeat Steps 1 3 above.

Figure 21-15 A bounded control lets users enter only valid values. It does not let them enter invalid values, only to reject them when then try to move on. This figure shows a bounded slider control from the Display Settings dialog in Windows XP. The little slider has four discrete positions. As you drag the slider from left to right, the legend underneath it changes from 800 by 600 pixels to 1024 by 768 pixels to to 1280 by 1024 to 1400 by 1050 pixels.

*B:PE1# configure service sdp 12 shutdown *B:PE1#

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