How the Internetworking TCP/IP Test Differs from Other Microsoft Exams

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How the Internetworking TCP/IP Test Differs from Other Microsoft Exams

In general, the Internetworking TCP/IP test is like other Microsoft tests; it has the same multiple-choice format. However, you need to know a few little quirks about this test to enhance your chances of passing. You can accustom yourself to these quirks as you take the sample tests so you will not falter under the time pressure of the real exam.

First, you need to know how to use the Windows Calculator. Each exam question provides access to the Calculator. This is the same Calculator located in the Accessories group in Windows 95 or Windows NT. Figure 1.1 shows a question from Microsoft’s TCP/IP assessment test, available in the Microsoft Roadmap. Note the Calculator button at the top right of the question.

The Calculator is provided to help convert numbers easily from binary to decimal as you work with subnet masks and TCP/IP addresses. However, you can use only the Calculator’s scientific mode to convert from decimal to binary. When you first open the Calculator, it is in standard mode. However, after you switch to scientific mode, the Calculator remains in that mode for the rest of the test. Figure 1.2 shows switching the Calculator from standard to scientific mode from the View menu.

You should become comfortable with converting numbers from binary to decimal and from decimal to binary. To convert a decimal number to binary, select the Dec button, then enter the number. Now select the Bin button. The binary number displays. When you use this number for TCP/IP addresses or subnet masks, be sure to add enough leading zeros to the number so you have eight binary digits. You need to make sure you use eight digits because you are dealing with octets. Figure 1.3 shows the final step of converting decimal 240 to binary 11110000. In this figure, the user has just selected Bin after entering 240 in decimal. A complete description of binary arithmetic, the TCP/IP addressing scheme, and subnet masking is contained in Chapter 3.

Memorize the binary-to-decimal conversion tables in Chapter 3. Then you will know that a subnet mask of 255 indicates all eight digits of that octet are the network ID whereas a subnet of 240 uses only four digits for the network ID. I use the calculator on the test, but only as a tool to check my math. If you know the conversion tables, you should be able to recognize any mistakes you make with the calculator. You should be so used to converting these numbers that you will know when something just doesn’t look right.

Microsoft has introduced a new type of question on many of the NT 4.0 exams. In these questions, you are presented with a scenario, a required result, and two optional results. The question also presents a proposed solution. You are asked to evaluate the solution as to whether it meets the required and optional results. The following is a sample question:

Scenario: It is a hot day and you are very thirsty. You want a drink.

Required results:

Quench thirst.
Replace fluids lost to heat.

Optional desired results:

The drink should be cold.
The drink should stimulate you.

Proposed solution:

You drink a hot cup of coffee.

A.	The proposed solution produces both the required result and the desired optional results.
B.	The proposed solution produces the required result but only one of the desired optional results.
C.	The proposed solution produces the required result but does not produce any of the desired optional results.
D.	The proposed solution does not meet the required result.

In this question, the coffee would replace bodily fluids and quench the thirst (assuming you are a coffee drinker). The drink is hot, so it does not meet one of the optional results, but the caffeine in the coffee would stimulate the drinker, meeting the other optional result. The correct answer would be B.

This question has nothing to do with TCP/IP, but it does show the format of these types of questions. Often the same scenario is used for three or four consecutive questions. You should study the scenario carefully, because it is typically used again. However, each question usually presents a different proposed solution, so study the solution for each question carefully.

Once you understand the scenario and proposed solution, the trick is now to answer the test question correctly. Note that the required results can have more than one requirement. If any of the required results are not met by the solution, you can immediately choose answer D (the proposed solution does not produce the required results). There is no need to examine the optional desired results because the required result must work so you can move on to the optional ones.

If you have determined that the required result is produced, you can examine the optional desired results. Note that there are always two optional results. You merely need to decide how many of these are produced by the proposed solution. Answer A indicates both optional results are produced; answer B indicates only one is produced; and answer C indicates none of the optional results are produced. Remember that each of these answers depends on all the required results being produced. If the required results are completely fulfilled, then you should choose answer D.

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