These two consecutive lessons are "Computer Basics", which is considered an entry-level course.
Guan Dacheng is only responsible for explaining the structure of computer hardware to the students. But what is different is that Guan Dacheng rarely follows the textbook in his lectures, and will ask some questions for students to think about from time to time in class.
Before he clicked on Yuxing, Guan Dacheng had actually called two classmates to answer a few very simple questions. In the question and answer room, the students also had a deeper understanding of the basic structure of bare metal, such as BIS, CPU, etc.
Another example……
In fact, today's class has come to an end. Guan Dacheng just wanted to ask one more classmate to get up and summarize the lesson he taught. He never thought that this would happen...
When I called Jin Yuxing's name, there was no answer for the first call, no answer for the second call, and still no answer for the third call. This is such an anger that a teacher should get rid of.
Sure enough, the smart people in the classroom guessed that bad luck fell on Yu Xing.
"Jin Yuxing, since you agreed, please answer my question!" Guan Dacheng said with a smile. But everyone could see that his smile was cold.
Without waiting for Yuxing to respond, Guan Dacheng continued: "In fact, computers, hardware and software are complementary to each other... Then I want to ask this student Jin, do you think this BIS is hardware?
Or software?”
When Yuxing heard this, he was stunned and said: "BOIS is a program, I think it should be software, right?"
Guan Dacheng sneered slightly and did not comment on the answer. He just said: "It seems that this classmate is quite proficient in computers. He even knows what software is a program!"
Of course Yuxing could hear the irony in his words. He glanced around and looked at the lively classmates with interest, and said bravely: "Proficiency can't be said, I understand a little, I understand a little!"
"Since you understand software, it will be easier!" Guan Dacheng looked surprised, "Then let me ask you a few questions about software! After all, you just said, 'You know everything about hardware, but you know half about software.'
Well!"
Yuxing was dumbfounded and thought to himself: You tnd are too good at criticizing! But he didn't dare to say these words, so he could only say in embarrassment: "Then please ask Teacher Guan for advice!"
"I won't ask any difficult questions..." Guan Dacheng said, "You should know about the firewall!"
However, as soon as he said these words, the whole class resonated in their hearts: The professor is called a beast, but he is thick-skinned!
"Ah... I've heard of it, I know a little bit about it." Yu Xing responded.
Jin Yuxing's little knowledge is that he only knows that the "firewall" is a program.
"That's good..." Guan Dacheng said, "Then let's talk about your views on the firewall!"
Hearing this question, Yu Xing was stunned for a moment. This question was quite vague, and it was just like a rat trying to pull a turtle and he had no idea what to say! Moreover, even if he said that he was ugly and acted badly, his opinion might not necessarily be that of Guan Dacheng.
What a view!
"this……"
"What? You can't answer?" Guan Dacheng said, "Let me give you some tips! You can talk about your knowledge from the two aspects of firewall construction and cracking! If you can't answer the answer again, then I can only take this course.
You have failed!"
These words made more than half of the students in the class look gloating, and a small half looked at Yu Xing with sympathy.
Yuxing also understood that Guan Dacheng's fangs were finally revealed, but he had to continue. However, he really didn't understand the firewall. After thinking about it, Yuxing felt that he could only make it up.
Fortunately, the hijacker who claimed to be a "gun expert" at the time was also an expert at picking locks. He could open anything from drawer locks to security doors to bank vault gates as long as he was given time. Now, he has all these skills
The lock-picking skills are all in Yuxing's head.
Yuxing has never eaten pork, but he has seen pigs running away. Although he doesn't know much about firewalls, he also knows that they are almost equivalent to anti-theft shells for computer data.
If Guan Dacheng had asked him to write a firewall in the exam, Yuxing might not be able to do it. But under the current situation, Yuxing could only put the theoretical student about 'lock' into the firewall and do whatever he wanted.
Sentence, maybe you can get away with it.
So, Yuxing sorted out his thoughts for a while, and started to boast under Guan Dacheng's gaze: "Actually, this firewall has the same function for computers as the security door in our home..."
Just one sentence, just this one sentence, Yuxing made the whole class feel stupid, wanting to laugh but not daring to laugh.
However, Guan Dacheng was startled and had other thoughts. He paused and said: "Continue, you continue..."
At this time, the students who had wanted to laugh out loud couldn't help but shut their mouths.
"Similar to a security door, a firewall program has a backdoor for users to enter and exit. Of course, this requires a password, just like a security door requires a key to open! For illegal intruders who want to crack the firewall
, the best way is to get the key. Of course, this ideal situation is not impossible, but it is very rare..."
Although the students in the class were all freshmen from the Department of Computer Science and knew little about firewall programs, they easily understood Yuxing's words and found them intriguing.
"Since it is very rare to get a key, bypassing the firewall has become the main means of cracking..."
"Wouldn't they just break down the door?" At this time, a girl with glasses in the back row stood up and asked.
Yuxing glanced at Guan Dacheng and saw that he had no objection, so he turned around and smiled at the girl, saying: "Although the shape of each security door is different, the quality of the boards is similar.
, the same is true for firewalls. If you want to break through the board directly, wouldn’t it be a robbery? The movement must be too loud, and it will attract people’s attention immediately!”
"That's right..." The girl was stunned and sat down in a daze.
"So, the topic is back again, bypassing the firewall, but how to bypass it? To be honest, everyone's coding habits are more or less different, just like the security door installed in your home, although the security door comes with
Door frames, but these door frames rarely fit tightly with the exterior wall frames. Those small gaps are where our breakthrough lies. We can completely pry the door frames, and when they are pried loose..."
"Classmate Jin, could you please be more specific, for example?" Another classmate interrupted Yuxing to ask.
"For example, let's take a large database!" Yuxing was already comfortable with this nonsense. "Some people wrote the database code, and the firewall installed outside it was written by other people. So there are
A question... Regarding the definition of certain variables, there will be subtle differences between the two programs, such as the difference in the number of floating point digits... This difference may not matter in the eyes of ordinary people, but in the eyes of experts
, that’s a leak!”
Yu Xing's words were just a bit novel to the ears of his classmates, but to Guan Dacheng's ears, they became a key, a key to unlocking his thoughts.
Seeing Yu Xing talking, Guan Dacheng wanted to stop, but he couldn't bear to do it. By chance, the bell rang for the end of get out of class.
Guan Da set up a horse and said: "Okay, Jin Yuxing, that's it for today! I'll count you as passing this time, and you won't be an exception next time!" As he said that, he began to pack up the lesson plans on the podium.
When Yuxing heard this, he immediately breathed a sigh of relief.
But there was also a handful of classmates who were quite dissatisfied with Guan Dacheng's anger at how easily Yu Xing had escaped, and they were cursing in their hearts.
Guan Dacheng picked up the lesson plan and started to leave. At the end, he added: "Jin Yuxing, you didn't say much about the firewall construction part just now. After you get down, write a paper and give it to me!"
Upon hearing this, this group of people immediately became happy and became very balanced.
Yuxing had to fulfill Guan Dacheng's request. Therefore, when he went back to 303, he had a sad look on his face.
It happened that Xiao Nie also came back from get out of class, walked to the door of the dormitory, saw Yu Xing, and joked: "Third brother, what's going on? Are you going to explode!?"
"You're the one who made people explode..." Yuxing countered, adding after that, "It's all up and down!"
Xiao Nie was speechless for a while, and finally said: "Third brother, you are indeed much more evil than me!"
Opening the bedroom door, Yuxing shouted as soon as he entered: "Xiao Jin, Xiao Jin, where did you die?"
"Stop barking, third brother, I haven't seen your pet snake since last night!" Xiao Nie said.
As soon as the words were spoken, Xiaojin shot out of an unknown corner and wrapped around Yuxing's left arm.
"You bastard, you've been in military training for so many days, you've become wild! You don't even know what to do now, right?" Yuxing was dissatisfied and afraid of hitting Xiao Jin on the head.
Xiao Jin dodged aggrievedly, not daring to resist at all.
Xiao Nie couldn't stand it any longer and said, "Third brother, if I had a pet snake as smart as Xiao Jin, I would definitely be reluctant to hit it." As he spoke, he turned on the computer and started doing his own thing.
When Xiao Jin saw someone speaking for him, he immediately raised his upper body and nodded frequently.
"You're so brave, aren't you?" Yuxing pretended to fight again, and Xiaojin hurriedly escaped under the bed. After a while, he stuck his head out again and swayed towards Yuxing.
Yu Xing grabbed it, brought it close to his eyes, and said, "Tell me, where have you been these days?"
As soon as he mentioned this, Xiao Jin's eyes immediately glowed, and his body twisted and twisted desperately, as if he wanted to go somewhere.
Yuxing quickly put it on the ground, and Xiaojin ran out immediately. Yuxing quickly followed: "Young maknae, I'm going out for a moment!"
"Go on, go on! I'll bring you a packed lunch later!"
"Okay!"
Xiaojin slipped out of the 28th floor along the corner, leading the way. He looked back from time to time to see if Yuxing was following.
Yuxing's current maximum speed is almost three times that of Xiaojin, so it's very easy to follow him.
Unknowingly, Yuxing followed Xiaojin to a remote dense forest by the lake.
After passing through a grass cage half a person's height, Xiao Jin stopped.
"Is this where you want to take me?" Yuxing asked.
Xiao Jin nodded repeatedly.
"There's nothing here! There are fallen leaves everywhere, it doesn't look like someone has been here?" Yuxing wondered.
Xiao Jin bounced up on the spot, repeated it several times, and then scurried forward again, making a very vivid "sniffing" movement.
Yuxing understood it and immediately let go of his five senses. His sense of smell instantly became a hundred times more sensitive.
"Suck--" After moving his nose, Yu Xing suddenly changed his expression: "It smells so bad! Is this...the smell of dead people!?"
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