IT职业英语 高巍巍 Unit10 Computer Security 10 1 reading新.ppt

IT职业英语 Unit10 Computer Security Section 1 Reading Computer Viruses Contents Vocabulary computer virus A computer virus is a computer program that can copy itself and infect a computer. They can: modify the copies or the copies may modify themselves spread from one computer to another when its host is taken to the uninfected computer Common viruses Worms can spread itself to other computers without needing to be transferred as part of a host. Trojan horses is a file that appears harmless until executed. In contrast to other viruses, Trojan horses do not insert their code into other computer files. Transmission of the virus Many personal computers are now connected to the Internet and to LAN, facilitating the spread of malicious code. Todays viruses may also take advantage of network services such as the World Wide Web, e-mail, and file sharing systems to spread, blurring the line between viruses and worms. Exercise 1 Answer the following questions 1. What is a computer virus? 2. How does a computer virus spread? 3. Please list the removable media that can carry computer viruses. 4. What are the differences between a computer virus, a worm and a Trojan? Click to edit company slogan . * computer virus 1 Common viruses 2 3 Transmission of the virus 1.virus n.病毒 2.worms n.蠕虫 3.Trojan horse n.特洛伊木马 4.execute vt.执行 5.LAN(Local Area Network) n.局域网 6.malicious adj.恶意的 *