The course "Basics of Virtual Networks" is an emerging course in response to the rapid development of virtual networks in recent years. It is difficult to say that it is the most basic basic knowledge about virtual networks. It is not easy to say that it is simple. This knowledge is all for students.
For the first time, if you don’t have a strong interest, it will be extremely difficult to learn.
The professor who teaches the basics of virtual networks at Jiangnan University is surnamed Liu. It is said that he is a former researcher at the Virtual Network Division of the Ministry of Government Information. He actually ran the establishment of the Huaxia Virtual Network Project. He is in his thirties and speaks very humorously.
You don’t have to be funny to be recognized by all students. Students who like this class will listen with gusto, and students who don’t like this class will listen to it with drowsiness. Lin Kexin, Yuan Lin, Su Qing belong to the former, Lu Xiaobu, Tong Hui,
Yu Dahai belongs to the latter, and Ye Li belongs to the two.
Any theory needs to be supported by practical operations. During this period of time following the poisonous spider instructor, Ye Li learned too much knowledge about virtual networks. This knowledge is more comprehensive, more thorough, and more aggressive than what is written in books.
With Ye Li's super memory, after reading for ten minutes, all the knowledge in the book will be imprinted in his mind. If Professor Liu reads according to the book and then takes out the examples in the book to teach, in this kind of class,
It's really boring.
Fortunately, every time Professor Liu read a section of the textbook, he would use his own personal experience as a case. Ye Li fell asleep when he heard the book knowledge, but became very serious when he heard the actual cases.
When encountering some controversial issues, they will compare them with what the instructor said.
Professor Liu quickly noticed the difference in Ye Li. "My classmate, you look disapproving. Is what I said wrong?"
If Ye Li, like other dozing classmates, remained in a "sleeping" state from beginning to end, it would not attract anyone's attention. The key is that he listens for a while and doesn't listen for a while. This makes Professor Liu feel confused. The sleeping students can be said to be
I don’t understand, just to try to improve the class attendance rate. What do you mean, my class is not good?
Everyone in the lecture theater focused their attention, and there were several familiar faces. Chen Ci and Lei Feng were virtual network majors and were sitting at the front of the classroom. Huangfuxuan was also sitting in an inconspicuous corner.
Seeing the professor mention Ye Li's name, Huangfuxuan felt secretly happy, "Haha... this country bumpkin has his day."
As long as you come to the virtual network basics class, Professor Liu usually won't say anything. Even if you are sleeping, it will be fine. Once he calls on you, it means that he is unhappy with you and wants to embarrass you. Based on Ye Li's final test scores last semester,
There is a high chance that I will be criticized this time. In front of so many classmates, I am sure to be embarrassed.
Ye Li immediately recovered from his trance and looked at Lu Xiaobu and Yu Dahai, who were dozing off and on. Then he looked at Tong Hui, who had reached the highest level of "sleeping with his eyes open", and was puzzled. At least we should listen.
After a while of class, why didn’t Mao look for them, but instead looked for himself?
He couldn't say anything if he had questions in his mind. Ye Li quickly said, "No, teacher, you are absolutely right."
The whole audience burst into laughter, this flattery was too obvious.
Professor Liu snorted inwardly. When he mentioned the advantages of virtual networks just now, the student had an expression of disapproval on his face. It would be too fake to agree with him now.
He asked with a straight face, "Tell me, what are your views on the advantages and disadvantages of virtual networks?"
view?
Ye Li's expression froze. He hadn't been asked a question by the teacher for a long time. He stood up and didn't know what to say for a while.
"Tch, I don't understand, I'm still pretending here. I obviously think the teacher doesn't teach well." Suddenly a very low voice came from the classroom, and everyone heard it...
The person who spoke deliberately pinched his throat. With Ye Li's current discernment, he immediately discovered that it was Huangfu Xuan who was sarcastic behind his back. It seemed that the "static electricity" last time did not make him remember the lesson, and this guy was itchy again.
Ye Li gave him a stern look. It seemed that when he found the opportunity, he would have to teach him a lesson in person, so as to prevent him from always looking for trouble.
Huangfu Xuan was startled by Ye Li's eyes, and quickly lowered his head. His heart kept beating, and he thought to himself, "It's not so unlucky that he can tell that it was me who said this? Damn it!"
Professor Liu was already feeling uncomfortable, but now that Huangfuxuan called him that, he felt even more annoyed. He stared at Ye Li, as if he was about to get angry if he couldn't express it.
Just say, what are you afraid of? Ye Li cleared his throat, sorted out the knowledge taught to him by the poisonous spider instructor, and picked out some relatively simple principles.
"Previous virtual networks were built on professional networks on public networks. Many virtual networks could not communicate directly with each other and had to be forwarded by routers. As we all know, the current virtual network technology is essentially different from the virtual networks of decades ago.
The most critical difference is that it breaks away from the limitations of the physical host and integrates the entire virtual network."
Hearing this, many students in the classroom shook their heads. These things are just basics. There is no point in telling things that everyone knows. The virtual network major students even showed ridiculous expressions. You need this little common sense.
Take it out and say it?
Ye Li was not affected by the people around him at all. He changed the subject and said, "Teacher, I think the advantages of virtual networks you just mentioned have huge flaws. Firstly, although today's virtual networks do not require a computer to host a host,
Or several computers share one physical host, but the entire network requires an extremely powerful virtual host, which seems to save resources and facilitate management, but in fact there is a huge hidden danger."
"This hidden danger is the second advantage you mentioned, security. You said that the virtual host has extremely powerful self-protection capabilities, but I think nothing is absolute. The virtual data in the virtual network is not impeccable. Because it is too excessive
I believe in its security protection, all virtual data encryption capabilities on the network have fatal flaws, and there are currently six known methods to break into virtual databases."
Ye Li's words seemed too shocking. All the students were in a state of shock at this moment!
It’s incredible. Is this what a student can say?
This theory has never even appeared on the Internet, and the classroom was extremely silent at this moment!
The virtual network is considered to be the network system with the strongest security protection, the fastest information transmission, and the most accurate data processing so far. The previous traditional network is gradually declining, and there is a faint trend of being replaced by the virtual network.
The country is also vigorously advocating virtual networks. Many high-level meetings are held in a virtual form. The holographic imaging function makes people feel like they are in the real world. It saves time and cost, and can achieve the same effect.
Even Jiangnan University is considering whether it should put virtual networks into teaching and establish virtual classrooms. With such a good virtual network system, can the security issues be as bad as what Ye Li said?
If the virtual network really has these fatal flaws, except for some protected information materials classified as secrets by the government, criminals can use these means to obtain any information they need, what secrets can there be in the entire virtual network system?
?
After a brief silence, the discussion in the classroom gradually started to get louder, and it tended to become more and more intense. Suddenly, the students were furious and began to criticize Ye Li verbally and in writing...
"Don't be alarmist here. You can't judge whether a virtual network is safe or not."
"That is, the several advantages of virtual networks listed by Professor Liu are the result of countless experts' demonstrations. How long have you studied the basic courses of virtual networks before you dare to doubt the experts' judgments?"
"All major banks are now using virtual network systems for business operations. If it is true as you said, wouldn't those hackers be able to make as much money as they want?"
These people who questioned Ye Li were basically students majoring in virtual network. It was very annoying to be made irresponsible remarks by a student from outside the department in this professional field, not to mention that they did not feel that the remarks were correct.
To say that fallacies are trivial is to say that this is a "dissent"!
Chen Ci, as the first person in the virtual network major, should have been the one with the most say. But the person who made the "dissenting opinion" was Ye Li. He was embarrassed to refute it directly, so he could only sit there and shake his head to express his disapproval.
No one knows that everything Ye Li said was not the result of his own imagination, but the experience of poisonous spiders. Using these six methods to invade virtual networks and obtain massive amounts of information is also an important part of training in recent times.
Courses.
Regarding the doubts raised by these classmates, Ye Li didn't feel the slightest surprise. It didn't matter. If you believe it, just believe it. If you don't believe it, let it go.
After hearing these remarks, Professor Liu was stunned. He is the person who knows the facts best. The problem mentioned by the student in front of him does exist, but because it involves too much, the book does not cover this aspect. Other students do not
I know it's normal.
Professor Liu waved his hand to signal everyone to quiet down, then smiled slightly at Ye Li, "You said there are six methods, can you explain them in detail?"
Ye Li nodded, it's not a big deal. If speaking out can solve the problem, it will also be a good thing for the construction and improvement of the national virtual network.
"The first method, which is also the simplest, is to use forged virtual IP addresses to obtain information directly from the main system; the second method is to establish a virtual data transmission black hole and intercept data information halfway; the third method is to create a Trojan horse
The program steals information when the target uses its virtual IP to upload or download data. These three methods are relatively easy to operate, and are also easily intercepted and tracked by the main system security."
"I won't go into details about the last three methods. They all use false instructions, use false data to replace real data, and perform brute force cracking. It is very troublesome to operate, but has the highest probability of success. However, doing so can easily cause the data link to collapse.
"
Professor Liu listened very carefully. When Ye Li said these words, his expression was very solemn, and he tapped his right hand unconsciously on the podium, "What you said does have a theoretical basis, but how practical is it?"
?In this way, I will now open the virtual network permissions to you, and you can show me how to obtain my information from the network."
This...Ye Li hesitated for a while. If he demonstrated here, all the students could see Professor Liu's secret, which didn't seem good.
The students from the Virtual Network Department who had the most violent reaction stopped talking. Whether this opinion is just nonsense or whether it is based on facts will be revealed soon. If Ye Li fails to demonstrate, everyone can drown him with a drop of spit.
The other students could see at this moment that the virtual network security problem probably really existed, otherwise Professor Liu would not be able to have such an expression, let alone let a student demonstrate it live.
A person cannot be judged by his appearance, and the sea cannot be measured~~~
The way most students look at Ye Li has changed. Even the little witch Yuan Lin looks at Ye Li with admiration. There are not many students who can make the professor think deeply in class. This shows that what he just said is definitely quite scientific.
Theoretical basis.
I just don’t know if it can be done in practice.
Professor Liu gave an encouraging look and began to take the lead in applauding, "It's okay, I don't have any hidden secrets. Please demonstrate it to us."
Under the guidance of the professor, soon there was a round of applause in the classroom.
How much of this applause is due to good intentions is unknown. Everything depends on whether Ye Li can successfully demonstrate.
