Which of the following security levels are applied on the network to prevent unauthorized access? Each correct answer represents a complete solution. Choose all that apply.

A.
Authentication

B.
Authorization

C.
Access control lists

D.
MAC filtering

Explanation:
Authorization and authentication are the security levels that are applied on the network to prevent unauthorized access. Authentication and authorization verifies username and password in order to determine whether the user is authorized or not.
Answer options C and D are incorrect. Access control lists and MAC filtering are the security features that are used to prevent network attacks.
What is authorization?
Authorization is a process that verifies whether a user has permission to access a Web resource. A Web server can restrict access to some of its resources to only those clients that log in using a recognized username and password. To be authorized, a user must first be authenticated.
What is authentication?
Authentication is the act of establishing or confirming something (or someone) as authentic, that is, that claims made by or about the subject are true (“authentification” is a variant of this word). This might involve confirming the identity of a person, tracing the origins of an artifact, ensuring that a product is what its packaging and labeling claims to be, or assuring that a computer program is a trusted one. Authentication is a process of verifying the user. The accuracy of the authentication can be determined by the number of factors used for the authentication, such as the following:
One-factor authentication
Two-factor authentication
Three-factor authentication
Multi-factor authentication
What is MAC filtering?
MAC filtering is a security access control technique that allows specific network devices to access, or prevents them from accessing, the network. MAC filtering can also be used on a wireless network to prevent certain network devices from accessing the wireless network. MAC addresses are allocated only to hardware devices, not to persons.