Answer:
(B) It allows an attacker to redirect targets to malicious webserver.
(D) It affects any clients querying the poisoned DNS server.
Explanation:
DNS cache poisoning is a serious type of attack that is designed to exploit the vulnerabilities inherent in a Domain Name Server (DNS) where a user is redirected from a real server to a fake one. It is also called DNS spoofing.
Normally, when your browser tries to visits a website through a given domain name, it goes through the DNS server. A DNS server maintains a list of domain names and their equivalent Internet Protocol addresses. This server (DNS) then responds to the request with one or more IP addresses for the browser to reach the website through the domain name.
The computer browser then get to the intended website through the IP address.
Now, if the DNS cache is poisoned, then it has a wrong entry for IP addresses. This might be via hacking or a physical access to the DNS server to modify the stored information on it. Therefore, rather than responding with the real IP address, the DNS replies with a wrong IP address which then redirects the user to an unreal website.
Although they might not be able to control your computer remotely as long as you are not trying to visit a web page via the poisoned information, there are other dangers attached to this type of attack.
Once the DNS server has been poisoned, any client trying to query the server will also be affected since there is no direct way of knowing if the information received from the server is actually correct.
Where is the attached file?
Answer:
C. Generalization
Explanation:
The relationship between subclass and superclass is generalization. For example there will be generalization between the class Employee and class HourlyEmployee which inherits from it. All the other options are not suitable.
The contains criteria filter requires the records displayed to have the specified text string anywhere. Thecontains operator is used to perform case-sensitive matching regardless of location in strings.
The begins with criteria filter on the other hand requires the records displayed to start with the specified text string
Answer:
B
Explanation:
The form feed character code is defined as 12 (0xC inbhexademical), and may be represented as control+L or^L. In a related use, control+L can be used to clear the screen in Unix shells such as bash. In the C programming language ( and other languages derived from C ), the form feed character is represented as '\f'.