tailieunhanh - Computer Viruses FOR DUMmIES phần 6

Một số chương trình chống virus là đủ thông minh để con số này ra, những người khác như câm như một bài viết và cần được cho biết từng chi tiết nhỏ: Nếu bạn có một modem cáp, DSL, hoặc một số khác "luôn luôn" kết nối Internet, sau đó bạn sẽ cần để lựa chọn các kết nối "trực tiếp" tùy chọn: Tùy chọn này có thể được diễn đạt khác nhau - phần mềm | Chapter 9 Installing Security Patches Jn This Chapter Looking for software vulnerabilities Getting and installing security patches Installing service packs Removing patches esides running antivirus software and firewall software installing security patches is one of the most important ways you can make your computer more secure. Although not yet as simple as running antivirus software installing security patches isn t difficult when you get the hang of it. In this chapter you get a handle on what security patches are why they re needed and the different ways to install them. Figuring Out Why You Need Security Patches The big software programs that run on PCs today consist of thousands and sometimes even millions of lines of source code the step-by-step instructions that give the program its functionality and personality . That s a lot to keep track of and as with anything made by people flaws can creep in. Software can be as complex as any mechanical orchestration of gears shafts pulleys bearings levers switches and so on. But unlike physical machinery software is almost entirely abstract it s a set of electronic instructions. You can t just 128 Part III Maintaining Your Vigilance hold it in your hand or put a wrench on it to tighten it up that makes it harder to examine for strength robustness resiliency and integrity. It s difficult to watch software s inner workings in action There is rarely something you can actually watch. Even a word-processing program consists of mostly mathematical calculations data buffers table lookups device management and other steps that mostly push electrons around far removed from what we see on the screen. Challenges like this make it difficult to know whether a complex software program is error-free and whether it does exactly what it s supposed to do and nothing else. The problem of ensuring that a single software program is error-free is compounded by the way that computers and networks interact today. Within a single computer .