These two sessions are "Computer Basics", which is considered an entry-level course.

Kwan Dacheng was only responsible for explaining the structure of computer hardware to the students. However, unlike others, Kwan Dacheng rarely follows the textbook in his lectures, and from time to time he will ask some questions for students to think about in class.

Before clicking on Yuxing, in fact, Guan Dacheng had already called two classmates to get up and answer a few very simple questions, and in the Q&A room, the students also had a deeper understanding of the basic structure of bare metal, such as BOIS, such as CPU, and then ......

In fact, today's class has come to an end, and Guan Dacheng just wants to call another classmate to get up and summarize his lecture and it's over. I never thought that I would come out with this ......

Shouting Jin Yuxing's name, one shout should not, two shouts should not, and three shouts still no one answers, it is a teacher's anger that should leave.

Sure enough, the big mold guessed by a smart person in a classroom fell on Yuxing's head.

"Jin Yuxing, since you have answered, then please answer my question!" Guan Dacheng said with a smile. However, everyone can see that his smile is cold.

Without waiting for Yuxing to respond, Guan Dacheng continued: "In fact, the computer, hardware and software complement each other...... Then I want to ask this Jin classmate, do you say this BOIS is hardware? Or is it 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, noncommittal to this answer, but said: "It seems that this classmate is quite proficient in computers, and even knows that software is a program!" ”

Of course, Yu Xing could hear the irony in his words, he glanced around at the lively classmates with interest, and said stubbornly: "I can't talk about being proficient, I understand a little, I understand a little!" ”

"Since you know software, it's easy to do!" Guan Dacheng looked surprised, "Then I'll ask you a few questions about the software!" After all, you just said, 'hardware knows everything, software knows half'! ”

Yuxing was dumbfounded, and secretly thought, "You're too good at buttoning hats!" However, he didn't dare to burst out of his mouth when he said this, so he could only say embarrassedly: "Then please ask Teacher Guan to teach me!" ”

"I don't ask any difficult questions...... Guan Dacheng said, "You should know about the firewall!" ”

However, as soon as he said this, it resonated in the hearts of the whole class: "The professor is called a beast, and he has thick skin!"

"Ahh I've heard of it, and I know a little bit about it. Yu Xing replied.

Jin Yuxing's little knowledge is just that he knows that the 'firewall' is a program.

"That's good......," Guan Dacheng said, "then talk about your opinion on the firewall!" ”

Hearing this question, Yuxing was stunned for a moment. This question is quite empty, and it is completely impossible for rats to pull turtles! Besides, even if he says that he is ugly, his opinion may not be Guan Dacheng's opinion!

"This ......"

"What? Can't answer? Guan Dacheng said, "I'll give you some hints!" You can talk about your understanding from the two aspects of building and cracking firewalls! If you can't answer it again, then I can only count you as failing this class! ”

These words made more than half of the class show gloating expressions, and a small half gave Yuxing a sympathetic look.

Yuxing also understood that Guan Dacheng's fangs had finally come out, but he couldn't help but continue. However, he really didn't know anything about firewalls, and after thinking about it, Yuxing felt that he could only make it up.

Fortunately, the hijacker who called himself a 'firearms expert' was still an expert in unlocking, from drawer locks to security doors to bank vault gates, as long as he was given time, he could open them. Right now, his lock-picking skills are all in Yuxing's mind.

Yuxing has never eaten pork, but he has seen pigs run, although he doesn't know much about firewalls, but he also knows that this thing is almost equivalent to the anti-theft shell of computer data.

If Guan Dacheng was to write the firewall for him, Yuxing would not necessarily be able to, but in the current situation, Yuxing could only lean on the firewall with the theory of 'lock', and just mess around, maybe he could get through the test in a fool's way.

So, Yuxing sorted out his thoughts a little, and began to talk rhetorically under Guan Dacheng's forced gaze: "Actually, this firewall has the same effect on the computer as the security door in our home......"

Just one sentence, just this sentence, Yuxing said stupidly in the class, wanting to laugh but not daring to laugh.

Guan Dacheng was stunned, which caused a different kind of thought, paused, and said, "Go on, you continue to talk ......"

At this moment, the classmates who wanted to laugh out loud couldn't help but close their mouths.

"Like the security door, the firewall program has a back door for the user to enter and exit, of course, this requires a password, just like the security door needs a key to open! The best thing for an intruder trying to break a firewall is to get the key, and of course, this idealized situation is not impossible, but it is rarely ......"

Although the class were all freshmen in the computer science department and knew little about firewall procedures, Yuxing's words were easy for them to understand, and they also found it intriguing.

"Since there are very few keys to get them, bypassing the firewall has become the main means of cracking......

"Won't people just slam on the door?" At this time, a girl with eyes in the back row stood up and asked.

Yuxing glanced at Guan Dacheng, and saw that he had no objection, so he turned around very sharply, smiled at the girl, and said: "Although the shape of each anti-theft door is different, the quality of the plate is similar, and the firewall is the same. The movement must be loud and will attract people's attention immediately! ”

"Oh......" The girl was stunned and sat down a little dumbfounded.

So, the topic is back, bypass the firewall, but how? To be honest, in fact, everyone's coding habits will be more or less different, just like the anti-theft door installed in your home, although the anti-theft door comes with its own door frame, but these door frames are rarely able to fit the exterior wall frame tightly, those small gaps are where we break through, we can pry the door frame, and so on to loosen ......"

"Mr. Jin, could you please be more specific, for example?" Another classmate interrupted Yuxing to ask.

"For example, let's take a large database!" "The database code is written by some people, and the firewall installed outside it is written by other people. So there's a problem... There are subtle differences between the two programs in the definition of certain variables, such as differences in the number of floating-point bits...... This difference may be nothing in the eyes of ordinary people, but in the eyes of masters, it is a leak! ”

Yuxing's words were a bit novel when they fell into the ears of his classmates, but when they fell into Guan Dacheng's ears, they became a key, a key to open his mind.

Seeing Yuxing talking eloquently, Guan Dacheng wanted to stop, but he couldn't pull his face, and it just so happened that the class bell rang at this time.

Guan Dacheng said: "Okay, Jin Yuxing, that's all for today!" This time you pass the test, not as an example! With 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 are also a handful of classmates who are quite slanderous at Yuxing's anger at how easily escaping Guan Dacheng, and they curse in their hearts.

Guan Dacheng picked up the lesson plan and was about to leave, but at the end, he added: "Jin Yuxing, you didn't say much about the firewall construction part just now, write a paper after you go down, and hand it over to me to see!" ”

As soon as they heard this, the hearts of this group of people immediately blossomed and became very balanced.

For Guan Dacheng's requirements, Yuxing can't help but complete them. Therefore, when he went back to 303, he had a sad face.

It just so happened that Xiao Nie also came back from class, walked to the door of the dormitory, saw Yu Xing, and quipped: "Third brother, what's wrong?" It's going to explode!? ”

"You just let people blow up ......" Yuxing countered, and added after speaking, "It's up and down!" ”

Xiao Ne was speechless for a while, and finally held back a sentence: "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 again?" ”

"Don't bark, third brother, I haven't seen your pet snake since last night!" Shaugne Road.

As soon as the words fell, Xiao Jin shot out from an unknown corner and wrapped around Yuxing's left arm.

"You rabbit cub, military training for many days, you can be regarded as playing wild! You don't even know your home now, do you? Yuxing was dissatisfied and afraid to hit Xiao Jin's head.

Xiao Jin dodged aggrievedly, not daring to resist slightly.

Xiao Ne couldn't stand it anymore, and said: "Third brother, if I have a pet snake with a spiritual surname like Xiao Jin, I will definitely be reluctant to fight it." As he spoke, he turned on his computer and went about his business.

Seeing that someone was helping it speak, Xiao Jin immediately stood up and nodded frequently.

"You're fat, aren't you?" Yuxing was about to fight again, and Xiao Jin quickly fled under the bed. After a while, it poked its head out again and swayed straight at Yuxing.

Yu Xing grabbed it, brought it to his eyes, and said, "Say, where have you been wild these days?" ”

As soon as he said this, Xiao Jin's eyes immediately lit up, and his body twisted desperately, as if he wanted to go somewhere.

Yuxing hurriedly put it on the ground, and Xiao Jin rushed out. Yuxing hurriedly followed: "Boss, I'll go out!" ”

"Go, go, go! I'll help you get a boxed lunch later! ”

"Great!"

Xiao Jin walked out of the 28th floor along the corner of the wall, leading the way in front of his head, and he still looked back from time to time to see if Yuxing was following.

Yu Xing's current limit speed is almost three times that of Xiao Jin, so it is very easy to tailgating.

Unknowingly, Yuxing followed Xiao Jin to a remote dense forest by the lake.

After passing through a half-man-tall straw cage, Kim stopped.

"This is the place you want to bring me here?" Yuxing asked.

Xiao Jin nodded repeatedly.

"There's nothing here! Fallen leaves everywhere, not like someone has ever been? Yuxing wondered.

Xiao Jin bounced up on the spot, repeated it several times, and then ran forward again, making a very vivid 'sniffing' motion.

Yu Xing comprehended, and immediately let go of his five senses, and his sense of smell became a hundred times more sensitive in an instant.

"Suck-" moved his nose, Yuxing suddenly changed: "It stinks!" This is... The smell of the dead!? ”

(Recommended~Collection~Don't be in urgent need!!) Thank you for your support!! ）

(Thanks to the votes for 'Big Benny Dancing Elephant'!) ）