Notes before the soft exam in the First Half of 2016!

In the first half of, the soft exam is about to start at a.m. on April 9. You have prepared for the soft exam for half a year and will have a very high test period. When you are about to take the test, I will share with you the exam notes.

1. Questions about exam time:

Network Engineer (other junior and intermediate) examinations are divided into morning and afternoon examinations, which are 150 minutes. Generally, the 75 multiple-choice questions in the morning exam have enough time to do the questions. On average, there seems to be not much time to do the questions. However, some questions are very basic and simple.

. 30 s is not required.

However, when encountering such a question, you must be aware of the question. At least ensure that the question cadre should be clearly divided into four options. You can't simply look at the question, and then select the option without reading it.

See the following question:
Identity authentication can be implemented in a distributed environment. the most insecure Identity Authentication solution in the following options is ().
A. the user obtains a digital certificate from the CA
B. the user sends a password, and the smart card generates a decryption key.
C. The user obtains the session key from KDC.
D. The user sends a password, which is the shared key specified by the communication recipient.
If you just look at the question in a rough way and do not see it clearly, you think it is a safe authentication solution, and option A is a safe authentication solution. Therefore, if you select option A, this is a big mistake, because the four options have not been read, and the questions have not been clearly read. A conceptual score-based question may be incorrect. The answer to this question is D. Careless

Attention from tukuai.com. Do not be fooled. There are many forms of Negation in the online work examination, so you must be clear about it.

 

2. Question Calculation
There are quite a few computing questions in the online work examination. In addition to the IP address calculation that everyone is familiar with, there are some other types of computing, such as computing speed, time, distance, and so on. Note the consistency of computing units. People are used

Concepts are written in a conventional way. For example, the size of a file in MB is MB. The unit of bandwidth is used to BPS. BPS here is bit per second, that is, bit. One byte is 8bit. Therefore, the Unit must be converted to the same one.

3. Common formulas and constants should be remembered.
Another constant that needs to be remembered is often used in the online work examination, and we also need to remember. For example, if the latency of a satellite link is 270 ms, the transmission speed of an electrical signal in the cable is 200 m/us, or the transmission speed of 1KM requires 5 nuances.
When changing the DB in the SNR calculation to S/N, pay attention to the conversion formula. For example, the signal-to-noise ratio of 30db is 10 ^ 3.
In other common signal processing methods, you must be able to accurately calculate the number of status codes. For example, in 16QAM, the number of bitwise states is 16, in the case of PSK, n = 4, and in the DPSK, n = 2.

4. Sort common concepts
For example, some IP addresses use the anti-mask. In the network engineer test, the network command is used to release the network and in the ACL configuration in the OSPF configuration, it must be used to specify the source address or destination address segment. The calculation of the anti-mask is very simple. Use 255-x = y directly. X indicates the number of subnet masks.

, Y indicates the number of corresponding bytes in the anti-mask. For example, the anti-mask corresponding to 255.255.255.255.255.240 is (255-255 ). (255-255 ). (255-255 ). (255-240), which is 0.0.0.15, that is, convert the subnet mask into a binary number, and then convert each bit to a decimal number. But computing

It is too troublesome.

5.

In the first half of 2016, the soft exam is about to start at AM on June. May 21. You have prepared for the soft exam for half a year and will soon have a peak test period. When you are about to take the test, I will share with you the exam notes.
Although it took a lot of time to review, the soft exam has a wide range of content, so it is inevitable that you will encounter unfamiliar knowledge points, this is also helpful for us to master some basic questions and methods.
Of course, if your review is already in place, these so-called methods are meaningless to you.

1. Two of the four options are conflicting. Congratulations, the answer to this question is probably one of the two answers. The hit rate is changed from 25% to 50% immediately.

2. Division. Many teachers have mentioned this method and it is still useful in the online work examination. When three of the four options are absolutely certain, you are sure of the four options. Through division, you can directly extend your 75% confidence to 100%.

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Notes before the soft exam in the First Half of 2016!