(Ask for collections, ask for recommendation votes, roll all over the ground for support!) ）

After Liu Fang finished speaking, he quickly opened the door and rushed out, he looked through the glass window and the security net into several other computer rooms, only to find that these computer rooms were dark, which means that no one is operating the computer in it at all, otherwise he can at least see the light emitted by the monitor. Pen "Fun" Pavilion www.biquge.info

This result made Liu Fang stunned on the spot, "No, is there no one?" What's going on......? ”

The possibility of intrusion through the LAN was ruled out, and all that was left was Liu Fang, who was completely blindfolded, and even if he wanted to break his head, he couldn't figure out how the other party did this.

After being stunned for a long time, Liu Fang finally cheered up: "The passage must exist, but it hasn't been discovered by me!" ”

He returned to the computer lab and checked the cables again. This time, Liu Fang checked very seriously. He followed the cable, and when he found the main unit on the podium, he saw a photocopier, and at the same time, a wired telephone next to the photocopier.

Liu Fang didn't know the photocopier, and he understood the purpose of the machine through the English logo on the photocopier. Upon examination, he found that the photocopier was connected to the main unit on the podium, and that the corded telephone was connected to the photocopier.

Liu Fang's gaze circled back and forth between the photocopier and the wired telephone, and after a while, he suddenly patted his head and said in annoyance: "With the photocopier and the wired telephone, isn't a complete information transmission channel formed?" How come I didn't discover such a simple principle! ”

Liu Fang has done some research on radio technology, and the principle of information transmission involved in radio has some common characteristics with the principle of wired data transmission, such as both sides need a complete channel to complete the work of data transmission.

The channel of radio transmission is the transmitter and receiver, and the wired equipment also needs the transmitter and receiver, the difference is that the electronic signal of the former is transmitted through the air, and the electronic signal of the latter is transmitted through the cable, which is a different division of labor according to different work characteristics.

If Liu Fang could have thought of the transmission principle of radio from the beginning, then the time for him to discover the problem would have been greatly shortened, but unfortunately he had not studied radio technology for a long time, which made him a little oversight.

"Theoretically speaking, as long as there is a complete channel between the two computers, and know the IP of the other computer's in the LAN, local communication can be realized, but this is also limited, specifically the distance can not be too far, because the electronic signal will gradually decay in the process of transmission, without the amplification of professional equipment such as signal repeaters, the electronic signal can not travel far, from this point of view, this guy must be hiding in Kaijiang University! He hacked me through a phone line! ”

Liu Fang showed the pleasure of finding the answer, and he continued to speculate: "Kaijiang University is now on vacation, and there are not many people, which reduces the difficulty of my search, and he can afford to buy a computer, he must be a rich man, as long as I go out to investigate, I should gain something!" ”

Liu Fang couldn't wait to turn off the computer and leave Building 1.

As for why he didn't look for clues in his computer, the reason is very simple: even if he found the clues, it is impossible to find the other party, because the other party is deliberately hiding his identity, and Liu Fang doesn't know the IP disguised by the other party in the LAN, so he can't talk to the other party through the computer.

It's already half past seven o'clock in the evening, and although there are not many people on campus, it is not deserted, and many students who have not gone home have come out for a walk to cool off.

Liu Fang's target is not the students who wander outside, but every room with lights on, especially the dormitory building of the faculty and staff, which is the object of his main care.

In these days, college students generally do not buy computers, first of all, everyone's economic conditions are not very good, even if some students have good family conditions, they are unlikely to buy computers.

Because the functions of the computer are too few, there are no other functions except for processing files, and spending tens of thousands of dollars to buy a computer that can only process files is not something that ordinary rich people can do.

Teachers are different, these people are relatively well-off, and some of them are working with computers themselves. For example, Professor Chen and others, their major is computer science, and if they have the financial conditions, I believe that these people will buy computers for research.

With these guiding ideologies, Liu Fang first came to a faculty dormitory building, he observed downstairs, and found that only a few houses in the building in front of him had the lights on, and after a little hesitation, he came to the door of the dormitory building.

The doors of the dormitory buildings are all equipped with dormitory administrators, and Liu Fang is ready to sneak in, and if the administrator finds out, he will find an excuse to fool around.

I saw him pretend to be casual and go straight inside, but before he could go up the stairs, the caretaker said, "Hey, what are you doing?" ”

Liu Fang had to stop and said, "I'm here to ask the teacher questions." ”

When the administrator's aunt saw that Liu Fang was too young, she couldn't help but feel more worried, and she asked, "Which teacher are you looking for?" ”

Liu reassured and said: Hell, how do I know which teacher to find? Well, Huaguo has the largest number of people with the surname Li, and I am not as good as ......

Liu Fang thought of this and replied as usual: "I'm looking for Teacher Li." ”

The administrator was stunned for a moment when she heard this, and then reminded: "Then you have to be careful, Mr. Li has been a little ...... lately Ahem, I didn't say anything, you go up. ”

Liu Fang didn't expect that he was actually right, he thanked him and went upstairs with anticipation.

Aunt Administrator looked at Liu Fang's back and muttered in a low voice: "I almost leaked my mouth, if the principal knows that I am speaking ill of Teacher Li behind my back, I will be in danger, alas, what happened to Teacher Li?" Didn't you say he wasn't mentally ill? Why does he cover his head all day long, and he has a stiff face when he sees everyone? I hope this kid won't be scolded and cried by him. ”

A quarter of an hour later, Liu Fang walked downstairs dejectedly, he had just peeked through the crack in the door, and found that there were no computers in these lighted dormitories.

The aunt of the administrator saw that he didn't look very good, so she comforted: "Child, don't blame Mr. Li, he hasn't been in a good mood lately, and he may be fine after a while." ”

Liu Fang pretended to nod, and after walking out of the building, he said inexplicably: "Why did this aunt say such a thing?" Who is Mr. Li? What the hell happened to him? Why are you in a bad mood? ”