Some summaries of the 21st postgraduate entrance examination 823 of network security major of Shanghai Jiaotong University and ideas on how to prepare for the 22nd postgraduate entrance examination pr

21 The postgraduate examination for postgraduate entrance examination ended at the end of last year . Now? 21 The preliminary examination results of postgraduate entrance examination should be coming soon , More confident postgraduate entrance examination er I should have prepared for the second round exam for a period of time , What is not sure should be preparing for adjustment , While preparing for the second exam , Or prepare for World War II ……

Anyway , Although I passed the exam , You can rest , But don't completely relax , Because now it's just the first time , The whole process of postgraduate entrance examination has only been completed by now , So we still need to clarify our learning tasks and goals . As for how to prepare for the second interview , How to learn , You can refer to a tweet in my official account honey orange , There are detailed methods , Then you can confide in me if you have any questions , I can answer some questions . Today's blog , Mainly want to say some detailed interpretation and analysis about professional courses .

One 、 Changes in exam subjects

I am a 20 Postgraduate entrance examination ashore , When I took the postgraduate entrance examination , And the years before my postgraduate entrance examination , The postgraduate examination of network security major in Jiaotong University only tests computer communication network . But from 21 The postgraduate entrance examination begins , Suddenly, a new professional course was added , Information theory .

This is what it is now 823 Examination contents of professional courses . Before this one came out , also 21 The child who took the postgraduate entrance examination asked me ,823 Will it be changed into an exam 408, I said it should not , Feeling 823 Professional courses are unlikely to change . result …… I was beaten in the face , Although I did not take the exam 823, But add an information theory . Be caught off guard …… When I finished my major class, I saw many children send me messages saying , In the course of information theory …… It is no wonder that ,10 The new exam subjects come out around August , It takes two months to review information theory , It's really unlikely . So many children told me that it might be World War II ……

however , Even if World War II , We should also find out why we failed before . Today, let's carefully analyze what we got in the professional courses after this change .

First , The name of this professional course is from computer communication network , It has become a comprehensive foundation of information security . Then the recommended bibliographies changed from two to three ：

• Principle and technology of computer communication network
• computer network
• Information theory and coding

In order to facilitate you to find these three reference books , Provide you with a cover ：

These are the first two , I bought the fifth edition of computer network , The recommended bibliography is the fourth edition , I think it's better to buy the latest version . Of course, the fourth edition can also be used , How to use these two books , And how to review computer network , You can refer to my blog about computer network review strategies ：

Shanghai Jiaotong University Postgraduate Entrance Examination Network Security Major 823 Review strategies

21 The distribution of professional topics in postgraduate entrance examination

There are only two parts ：

• Computer communication network
• Information theory and coding

The proportion of the two scores ：1:1, That is to say, each 75 branch . According to the usual examination style of Jiaotong University , There must be no choice to fill in the blank , It must be all big questions .

• Computer communication network
  • Short answer
  • The problem of discrimination
  • Q & A questions
  • Calculation questions
• Information theory
  • Practical questions
  • Proof problem

Among them, some questions of computer communication network have not changed , As usual . The biggest change is information theory . Information theory mainly tests application questions and proof questions . Application problems are calculation problems .

The first question of information theory , The test is Binary symmetric channel BSC And binary erase channel BEC These two classic models , The questions around this knowledge point .
Second question of information theory , The test is Calculate differential entropy
Third question of information theory , Yes, I did yes （7,4） Hamming code and its generating matrix G Knowledge about
Fourth question of information theory , set up A random variable （X,Y） It satisfies the Gauss distribution N, seek Y Yes X Of Linear estimation And prove that the estimate is Minimum mean square error estimation
Fifth question of information theory , It's a proof question
Question 6 of information theory , It's a proof question
Seventh question of information theory , The test is still a proof question ……

Specific topics , I won't list , I have a summary here , If you need it, you can send it to me .
We can see from the above information theory topic , In addition to computing, information theory , It's the test proof ！ therefore , Whether it's 22 Freshmen taking the postgraduate entrance examination , still 22 World War II graduate students , Pay attention to the training of these two topics .

Last year, when this exam outline came out , Because the first year of this subject , So everyone is a little confused about the direction , Ask me how to review . I said that if I couldn't grasp the key point, I would go through the original book , It's good to know everything that won't happen . Don't take any chances . It's so difficult to say this, you may not take the exam , This point is the proof problem , May not take the exam . But what reality tells you is , The teacher always likes to order where he likes . therefore , Deal with this situation , The only way is to make all the knowledge points clear without leaving a dead corner , Then let him take professional courses casually , You can answer almost .21 There were only two months left for postgraduate entrance examination , Maybe I can't prepare , as excusable . But for 22 For postgraduate entrance examination , Then stumble in information theory , It's attitude .

Although I have now given an analysis of the question type , But there is still a lot of uncertainty . because 22 The postgraduate entrance examination is only the second year , The only question type that can be referred to is this year . therefore , The review method is still like the above , Simple and crude , Go over the book of information theory carefully , Brush the questions carefully after class . It happens that this course is also open to graduate students , This book is also used , So everybody 22 The companion of the young man who takes the postgraduate entrance examination can ask the elder and elder students for information theory materials and courseware , There are exercises analysis and so on . Try to learn more about this information , Know yourself and the enemy, and you will never be defeated in a hundred battles ！

The following is the QR code of my official account honey orange , Welcome to your attention ！ There are some of my experience posts about postgraduate entrance examination , It should help you ！