What are the ways in which a computer can be infected with a virus?

1.The network is some malicious plug-ins on the Internet, which will let you get some viruses, or they may be viruses that come down from **down; 2.It is data transmission, such as data cables, hard disks, USB flash drives, and when connected to the computer, some viruses will enter the computer.

Basically, there are these two, and the third is to write the virus yourself, which the great gods will do, but ordinary people will not.

The propagation route of computer virus is mainly carried out through file copying, file transfer, file execution, etc., file replication and file transfer need to be transmitted media, and file execution is the inevitable way of virus infection (word, excel and other macro viruses are indirectly executed through word, excel call), therefore, virus propagation has a direct relationship with the change of file transmission.

1) Floppy disk propagation: through mobile storage is not equipped to spread, these devices mainly include floppy disks, optical discs, U disks, etc.

2) Hardware device propagation: Propagation through immovable computer hardware devices, which usually have dedicated ASIC chips and hard disks for computers, etc. Clean hard drives can be infected and spread again due to local or moved to other places for use, repair, etc.

4) BBS electronic bulletin board (BBS): Because it is easy to get on the site and has little investment, it is deeply loved by the public. Since BBS stations generally do not have strict security management and are not subject to any restrictions, this provides a place for some virus programmers to spread the virus.

One of the possible ways for a computer to become infected with a virus is to run software on a USB drive that is not strictly vetted by anti-virus software.

According to the analysis of the current virus characteristics, there are two ways of transmission: one is through the machine, in fact, it is transmitted through the hard disk, and it is transmitted through the floppy disk.

The other is spread through the Internet, mostly through email, which damages files with specific extensions and slows down the mail system, or even causes it to crash, such as worms.

Ways to avoid contracting the virus.

Do not open unfamiliar emails and attachments from unknown sources, even if they are emails from friends and family. When you receive a suspicious message from a friend while chatting, don't click on it, and first make sure it's really from your friend.

Users who use mobile devices such as USB flash drives (flash drives) in specific public places such as public computer rooms and Internet cafes in schools should be especially cautious to prevent infection with Trojan horses, which may cause their information to be leaked and stolen.

Answer]: a, b, c, d

Irregular network operations can lead to virus infection on a computer, and the main ways to do so include browsing insecure web pages, virus-infected files or software. Receiving virus-infected e-mails, using instant messengers, etc.; Use a hard disk and USB flash drive of unknown origin. It is also easy to infect computers with viruses.

Viruses that affect computers are mainly ().

a.Infected while receiving external messages.

b.Infection due to hardware damage.

c.Add a hard scatter piece to set up a bright search that is infected.

d.Infected by acacia due to improper operation.

Correct Answer: a