you can do a rather .......... denial of service attack on the system

In the quarter there were also 12 attacks that ..........as “mega attacks,” peaking at more than 1,000 gigabits per second (Gbps) and 50 million packets per second (Mpps).”

DoS có nghĩa là............

[<$>] tấn công từ chối dịch vụ

[<$>] từ chối dịch vụ

[<$>] tấn công dịch vụ từ chối phân tán

[<$>] hệ điều hành đĩa

What is abbreviation of DoS?

what do DoS attack aim?

 How does a DoS attack work? 

what common tools used for Dos mentioned in “Computer Security Fundamentals”?

By now you are aware, in a .......... way, of the dangers of the Internet, and you have explored a few basic rules for protection on the Internet.

The old adage that “knowledge is power” is not only good advice, but also an axiom upon which to build your entire security outlook. Có nghĩa đúng nhất là

This chapter will describe for you, in depth, the workings of the denial of service (DoS) attack. This threat is one of the most common attacks on the Internet, so it is ........... for you to understand how it works and how to defend yourself against it

one of the most ......... forms of attack on a system is a

DoS.

A workload for a computer system may be defined by the number of simultaneous users, the size of files, the speed of data.........., or the amount of data stored.

Any computer system, web server, or network can only handle a ........ load

If you exceed any of computer limits, the ........load will stop the system from responding

Every technology has limits; if you can exceed those limits, then you can take........

what web server service can you use that mentions Computer Security

Fundamentals?

Ask several people to open their browsers and key the IP address of that machine in the address........... They should then be viewing the default website for that web server.

[<$>] tab

[<$>] bar

[<$>] server

[<$>] key

Of course, just one machine in your classroom or lab that is simply pinging on your web server is not going to ......... affect the web server

 After a certain ........(certain number of machines pinging the server), it will stop responding to requests, and you will no longer be able to see the web page.

In order to see this denial happen with as few machines involved as possible, you ....... use a very low-capacity PC as your web server.

 running an Apache web server on a simple laptop running Windows 7 Home Edition, it can take about 15 machines each running about 10 different command windows ........pinging to cause a web server to stop responding to legitimate requests.

 Likewise, ......DoS attacks use much more sophisticated methods.

:.......the target machine with so many packets that it can no longer respond to legitimate requests. It is important to be aware that this is just an illustration.

With modern servers, and many servers actually being hosted in clusters or server ......., this exact illustration would not work against a modern target.

 a hacker might develop a small virus whose sole purpose is to infect as many computers as possible and then get each of the ........ computers to initiate a DoS attack on the target.

This sort of DoS is easy to........, and it can be hard to stop.

A DoS that is launched from several different machines is called a ............... denial of service (DDoS) .

 One of the most widely known examples of ransomeware is the infamous …, first discovered in 2013.

CryptoLocker utilized … to lock the user’s files.

 CryptoWall is … of CryptoLocker first found in August 2014.

 FakeAV first appeared in … 2012.

[<$>] July
[<$>] October
[<$>] September
[<$>] March

This was a fake antivirus that would pop up fake virus warnings. What is this?

This virus is very interesting for multiple reasons. First, it specifically targets Macintosh computers.. What is this?

MacDefender was first seen in the early months of 2011. 

 …  is embedded in some web pages, and when a user visits those web pages, she is given a fake virus scan that tells her she has a virus and it needs to be fixed. The “fix” is actually downloading a virus.

It is transmitted as a zip file attached to an email. The email claims that the zip file contains data related to an invoice, tax issue, or similar urgent paperwork. This is a classic example of attempting to entice the recipient to open the attachment. What is it?

[<$>] CryptoLocker
[<$>] MacDefender
[<$>] W32/Netsky-P
[<$>] Troj/Invo-Zip

If the recipient does open the attachment with Troj/Invo-Zip, then he will have installed spyware on his machine that would first disable the … and then start attempting to capture information including financial data. It even takes screenshots of the user’s desktop. 

[<$>] internet connection
[<$>] antivirus program
[<$>] console table
[<$>] firewall

W32/Netsky-P was first found in … and was still going around in 2011. 

It is a fairly typical virus in that it spreads primarily through email, but it also uses file sharing utilities to copy itself. It copies itself to various directories and shared folders. In one interesting twist, it attempts to copy itself to C:\WINDOWS\FVProtect.exe. The name would make many people (including otherwise technically savvy people) think this program was actually part of some antivirus utility. It also copies itself to C:\WINDOWS\userconfig9x.dll. Again, it would appear to be a system file, thus making people less likely to delete it. What is it?

[<$>] CryptoLocker
[<$>] MacDefender
[<$>] W32/Netsky-P
[<$>] Troj/Invo-Zip

 It utilized a multimodal approach to spreading. This means that it used more than one mechanism to spread and infect new machines. It would copy itself to any shared drives on your network and would email itself out to everyone in your address book. What is it?

What does virulent mean?

 In the case of Sobig, if one person on a network was unfortunate enough to open an email containing the virus, not only would his machine be infected, but so would … shared drive on that network to which this person had access.

This particular virus spread so far and infected so many networks that the multiple copying of the virus alone was enough to bring some networks to a standstill. This virus did not destroy files or damage the system, but it generated a great deal of traffic that bogged down the networks infected by it. The virus itself was of moderate sophistication. What is it?

 Choose the wrong feature of computer virus.

This virus not only collected email addresses from your address book, but also from other documents on your machine (Gudmundsson, 2004). What is this?

[<$>] The Bagle virus
[<$>] MacDefender
[<$>] The Mimail virus
[<$>] A Nonvirus virus

 Mimail had its own built-in …, so it did not have to “piggy back” off your email client.

The email it sent claimed to be from your system administrator. It would tell you that your email account had been infected by a virus and that you should open the attached file to get instructions. Once you opened the attached file, your system was infected. What is this?

This virus was particularly interesting for several reasons. To begin with, it spread both through email and copying itself to shared folders. Second, it could scan files on your PC looking for email addresses. Finally, it would disable processes used by antivirus scanners. In biological terms, this virus took out your computer’s “immune system”. What is this?

Another new type of virus has been gaining popularity in the past few years, and that is the “… virus” or, put simply, a hoax. Rather than actually writing a virus, a hacker sends an email to every address he has. The email claims to be from some well-known antivirus center and warns of a new virus that is circulating. The email instructs people to delete some file from their computer to get rid of the virus. The file, however, is not really a virus but part of a computer’s system.

 What is CERT?

This virus, which first appeared in 2012, targeted Windows operating systems. The first item that makes this virus notable is that it was specifically designed by the U.S. government for espionage. It was discovered in May 2012 at several locations, including Iranian government sites. It is spyware that can monitor network traffic and take screenshots of the infected system. What is it?

The most common way for a virus to spread is as an email attachment. This realization leads to some simple rules that will drastically reduce the odds of becoming infected with a virus. What is wrong rule?

 Spyware can be as simple as a … used by a website to record a few brief facts about your visit to that website, or it could be of a more insidious type, such as a key logger.

The most common use of a key logger is to ...

There are some perfectly … uses for spyware. Some employers have embraced such spyware as a means of monitoring employee use of company technology.

Parents can also … to use spyware on their home computer to monitor the activities of their children on the Internet.

The real question is this: How does spyware get onto a computer system in the first place? The most common method is a …. It is also possible that when you visit a certain website spyware may download in the background while you are simply perusing the website.

 Some well-known Trojan horses such as the 2nd Thought application that downloads to a person’s PC and then blasts it with ...

 This particular piece of spyware (the 2nd Thought application) is one that downloads to your PC when you visit certain websites. It is benign in that it causes no direct harm to your system or files, nor does it gather sensitive information from your PC. However, it is incredibly annoying as it inundates your machine with unwanted ...

 Which of the following is the best definition of virus? 

What is the most common damage caused by virus attacks? 

[<$>] Deleting files.
[<$>] Changing the Windows Registry.
[<$>] Corrupting the operating system.
[<$>] Slowing down networks by the virus traffic.

What is the most common way for a virus to spread?

Which of the following is the primary reason that Outlook is so often a target for virus attacks?

Which of the following virus attacks used a multimodal approach? 

What factor about the Sobig virus made it most intriguing to security experts?

What was most interesting to security experts about the Mimail virus?

Which of the following reasons most likely made the Bagle virus spread so rapidly?

What is the primary way a virus scanner works?

What made the Bagle virus so dangerous? 

 Which of the following is a way that any person can use to protect against virus attacks? 

Which of the following is the safest way to send and receive attachments?

Which of the following is true regarding emailed security alerts?

Which of the following is something a Trojan horse might do?

What is a buffer-overflow attack?

What virus exploited buffer overflows?

What can you do with a firewall to help protect against virus attacks?

 A key logger is what type of malware?

Which of the following is a step that all computer users should take to protect against virus attacks?