谁能帮我找篇文章 关于计算机的 要全英文的 我交作业 不带翻译的那种 谢谢了
\u82f1\u6587\u6587\u7ae0\u7ffb\u8bd1!! \u8981\u9ad8\u624b\u7ffb\u8bd1!\u4e0d\u8981\u673a\u5668\u7684!Wang Peng sat in his empty restaurant feeling very frustrated.
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It had been a very strange morning.
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Usually he got up early and prepared his menu of barbecued mutton kebabs, roast pork, stir-flied vegetables and fried rice. Then by lunchtime they would all be sold.
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By now his restaurant ought to be full of people. But not today! Why was that? What could have happened?
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He thought of his mutton, beef and bacon cooked in the hottest, finest oil.
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His cola was sugary and cold, and his ice cream was made of milk, cream and delicious fruit.
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"Nothing could be better," he thought. Suddenly he saw his friend Li Chang hurrying by.
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"Hello, Lao Li," he called. "Your usual?" But Li Chang seemed not to hear. What was the matter? Something terrible must have happened if Li Chang was not coming to eat in his restaurant as he always did.
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Wang Peng followed Li Chang into a new small restaurant. He saw a sign in the window.
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Tired of all that fat? Want to lose weight?
Come inside Yong Hui\u2019s slimming restaurant.
Only slimming foods served here.
Make yourself thin again!
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Curiosity drove Wang Peng inside. It was full of people. The hostess, a very thin lady, came forward. "Welcome," she said. "My name is Yong Hui. I'll help you lose weight and be fit in two weeks if you eat here every day."
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Then she gave a menu to Wang Peng. There were few choices of food and drink on it: just rice, raw vegetables served in vinegar, fruit and water. Wang Peng was amazed at this and especially at the prices.
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It cost more than a good meal in his restaurant! He could not believe his eyes. He threw down the menu and hurried outside. On his way home he thought about his own menu.
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Did it make people fat? Perhaps he should go to the library and find out. He could not have Yong Hui getting away with telling people lies! He had better do some research!
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At the library Wang Peng was surprised to find that his restaurant served far too much fat and Yong Hui\u2019s far too little. Even though her customers might get thin after eating Yong Hui\u2019s food, they were not eating enough energy-giving food to keep them fit. They would become tired very quickly. Wang Peng felt more hopeful as he drove back home.
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Perhaps with a discount and a new sign he could win his customers back. So he wrote:
Want to feel fit and energetic?
Come and eat here! Discounts today!
Our food gives you energy all day!
The competition between the two restaurants was on!
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Computer security is the process of preventing and detecting unauthorized use of your computer. Prevention measures help you to stop unauthorized users (also known as "intruders") from accessing any part of your computer system. Detection helps you to determine whether or not someone attempted to break into your system, if they were successful, and what they may have done.
Why should I care about computer security?
We use computers for everything from banking and investing to shopping and communicating with others through email or chat programs. Although you may not consider your communications "top secret," you probably do not want strangers reading your email, using your computer to attack other systems, sending forged email from your computer, or examining personal information stored on your computer (such as financial statements).
Who would want to break into my computer at home?
Intruders (also referred to as hackers, attackers, or crackers) may not care about your identity. Often they want to gain control of your computer so they can use it to launch attacks on other computer systems.
Having control of your computer gives them the ability to hide their true location as they launch attacks, often against high-profile computer systems such as government or financial systems. Even if you have a computer connected to the Internet only to play the latest games or to send email to friends and family, your computer may be a target.
Intruders may be able to watch all your actions on the computer, or cause damage to your computer by reformatting your hard drive or changing your data.
How easy is it to break into my computer?
Unfortunately, intruders are always discovering new vulnerabilities (informally called "holes") to exploit in computer software. The complexity of software makes it increasingly difficult to thoroughly test the security of computer systems.
When holes are discovered, computer vendors will usually develop patches to address the problem(s). However, it is up to you, the user, to obtain and install the patches, or correctly configure the software to operate more securely. Most of the incident reports of computer break-ins received at the CERT/CC could have been prevented if system administrators and users kept their computers up-to-date with patches and security fixes.
Also, some software applications have default settings that allow other users to access your computer unless you change the settings to be more secure. Examples include chat programs that let outsiders execute commands on your computer or web browsers that could allow someone to place harmful programs on your computer that run when you click on them.
Technology
This section provides a basic introduction to the technologies that underlie the Internet. It was written with the novice end-user in mind and is not intended to be a comprehensive survey of all Internet-based technologies. Subsections provide a short overview of each topic. This section is a basic primer on the relevant technologies. For those who desire a deeper understanding of the concepts covered here, we include links to additional information.
What does broadband mean?
"Broadband" is the general term used to refer to high-speed network connections. In this context, Internet connections via cable modem and Digital Subscriber Line (DSL) are frequently referred to as broadband Internet connections. "Bandwidth" is the term used to describe the relative speed of a network connection -- for example, most current dial-up modems can support a bandwidth of 56 kbps (thousand bits per second). There is no set bandwidth threshold required for a connection to be referred to as "broadband", but it is typical for connections in excess of 1 Megabit per second (Mbps) to be so named.
What is cable modem access?
A cable modem allows a single computer (or network of computers) to connect to the Internet via the cable TV network. The cable modem usually has an Ethernet LAN (Local Area Network) connection to the computer, and is capable of speeds in excess of 5 Mbps.
Typical speeds tend to be lower than the maximum, however, since cable providers turn entire neighborhoods into LANs which share the same bandwidth. Because of this "shared-medium" topology, cable modem users may experience somewhat slower network access during periods of peak demand, and may be more susceptible to risks such as packet sniffing and unprotected windows shares than users with other types of connectivity. (See the "Computer security risks to home users" section of this document.)
What is DSL access?
Digital Subscriber Line (DSL) Internet connectivity, unlike cable modem-based service, provides the user with dedicated bandwidth. However, the maximum bandwidth available to DSL users is usually lower than the maximum cable modem rate because of differences in their respective network technologies. Also, the "dedicated bandwidth" is only dedicated between your home and the DSL provider's central office -- the providers offer little or no guarantee of bandwidth all the way across the Internet.
DSL access is not as susceptible to packet sniffing as cable modem access, but many of the other security risks we'll cover apply to both DSL and cable modem access. (See the "Computer security risks to home users" section of this document.)
How are broadband services different from traditional dial-up services?
Traditional dial-up Internet services are sometimes referred to as "dial-on-demand" services. That is, your computer only connects to the Internet when it has something to send, such as email or a request to load a web page. Once there is no more data to be sent, or after a certain amount of idle time, the computer disconnects the call. Also, in most cases each call connects to a pool of modems at the ISP, and since the modem IP addresses are dynamically assigned, your computer is usually assigned a different IP address on each call. As a result, it is more difficult (not impossible, just difficult) for an attacker to take advantage of vulnerable network services to take control of your computer.
Broadband services are referred to as "always-on" services because there is no call setup when your computer has something to send. The computer is always on the network, ready to send or receive data through its network interface card (NIC). Since the connection is always up, your computer’s IP address will change less frequently (if at all), thus making it more of a fixed target for attack.
What’s more, many broadband service providers use well-known IP addresses for home users. So while an attacker may not be able to single out your specific computer as belonging to you, they may at least be able to know that your service providers’ broadband customers are within a certain address range, thereby making your computer a more likely target than it might have been otherwise.
The table below shows a brief comparison of traditional dial-up and broadband services.
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