.png - ability to maintain a transparent background. good for logos.
.jpg - more common image format. used for general image rendering and also has a higher quality than the .png format.
Answer: (D)DoS attack.
Explanation:
Denial of Service attack occurs when an hacker prevents the real users from accessing the service by sending excessive message to the server asking it to authenticate requests with invalid return address.
Answer:
This is called a domain name
Explanation:
A domain name is an address used by internet users to access a website.
You can join tables by using a condition in the "where" clause.