The use of an overarching rule that if not explicitly permitted, permission will be denied. When setting up a firewall we could want to default to this setting before adding rules.
A Auto Block
B Default Deny
C Always On
The correct answer and explanation is:
The correct answer is B Default Deny.
In network security, the Default Deny rule is a security principle where, by default, all incoming and outgoing traffic is blocked unless explicitly allowed by predefined rules. This is the opposite of the “Default Allow” approach, where traffic is permitted unless specifically blocked. The Default Deny approach is considered a more secure method for setting up firewalls and network systems because it minimizes exposure to unauthorized access.
When setting up a firewall, administrators will start with a default deny rule, meaning that any connection attempt that is not explicitly permitted by the rules will be blocked. Afterward, administrators will create specific firewall rules to allow certain types of traffic, such as web traffic (HTTP or HTTPS), email protocols (SMTP, IMAP), or other necessary services.
This approach provides a high level of control over network traffic, reducing the chances of unauthorized access. It also minimizes the risk of security breaches since only the traffic that is explicitly allowed is granted access. Additionally, using a Default Deny rule forces network administrators to be more deliberate when setting up access controls and ensures that no unnecessary services are left exposed.
The Default Deny policy is often used in combination with a “least privilege” access control model, where only users or systems that need access to specific resources are granted that access. In this way, it is one of the most secure and effective methods for preventing unauthorized access and ensuring network security.