Answer:
B.O(n).
Explanation:
Since the time complexity of visiting a node is O(1) in iterative implementation.So the time complexity of visiting every single node in binary tree is O(n).We can use level order traversal of a binary tree using a queue.Which can visit every node in O(n) time.Level order traversal do it in a single loop without doing any extra traversal.
Answer:
4. A Denial of Service attack (DDOS attack).
Explanation:
A DDOS attack is a malicious attempt to disrupt the normal traffic to a service.
In essence, it sends an enormous amount of requests to the service, until the server is overwhelmed because it can't handle that much traffic, and collapses in an overflow.
Thus, regular users are not able to access their services.
Usually, attackers use a botnet, a network of "zombie" computers that have been previously infected with a malware that allows the attacker to remotely control them, then the botnet starts to send a flood of traffic from different locations, and make the attacker difficult to detect or track.
Answer:
The fundamental limitation of symmetric (secret key) encryption is ... how do two parties (we may as well assume they are Alice and Bob) agree on a key? In order for Alice and Bob to communicate securely they need to agree on a secret key. In order to agree on a secret key, they need to be able to communicate securely. In terms of the pillars of IA, To provide CONFIDENTIALITY, a secret key must first be shared. But to initially share the key, you must already have CONFIDENTIALITY. It's a whole chicken-and-egg problem.
This problem is especially common in the digital age. We constantly end up at websites with whom we decide we want to communicate securely (like online stores) but with whom we there is not really an option to communicate "offline" to agree on some kind of secret key. In fact, it's usually all done automatically browser-to-server, and for the browser and server there's not even a concept of "offline" — they only exist online. We need to be able to establish secure communications over an insecure channel. Symmetric (secret key) encryption can't do this for us.
Asymmetric (Public-key) Encryption
Yet one more reason I'm barred from speaking at crypto conferences.
xkcd.com/177/In asymmetric (public key) cryptography, both communicating parties (i.e. both Alice and Bob) have two keys of their own — just to be clear, that's four keys total. Each party has their own public key, which they share with the world, and their own private key which they ... well, which they keep private, of course but, more than that, which they keep as a closely guarded secret. The magic of public key cryptography is that a message encrypted with the public key can only be decrypted with the private key. Alice will encrypt her message with Bob's public key, and even though Eve knows she used Bob's public key, and even though Eve knows Bob's public key herself, she is unable to decrypt the message. Only Bob, using his secret key, can decrypt the message ... assuming he's kept it secret, of course.
Explanation:
What Nadeen needs to do to get people to engage with her web site is to regularly post new content and regularly respond to user comments and questions (options A and C).
<h3>What should Nadeen do to increase visits to her website?</h3>
Currently, social networks and pages have become tools to share information and create a community of people around a topic.
From this trend, many people have developed their own web pages to share their knowledge and experience with other people so that knowledge becomes public and help those who do not have as much knowledge.
However, for a page to have high interactions and visits from the public, the owner of the page must ensure that they comply with some recommendations that will increase the traffic of their page, such as:
- Post frequently: This is because people are constantly looking for information and like to be up to date with the latest.
- Respond to user comments and questions: This creates a link between the page owner and their visitors that makes them feel comfortable with this page. This also helps the owner create a community where everyone participates by contributing knowledge.
Note: This question is incomplete because the options are missing. Here are the options:
A. She must post new content on her website regularly.
B. She must increase the number of pay-per-click advertisements on her website.
C. She must regularly respond to user comments and questions.
D. She must use a secure payment gateway.
Learn more about vegan in: brainly.com/question/8708517
