Which security solution can an organization deploy to prevent unauthorized external access to its internal network? IDS Firewall Sniffer VPN

An organization can deploy a Firewall to prevent unauthorized external access to its internal network.

Here's a step-by-step explanation:

1. A firewall is a network security device that monitors incoming and outgoing network traffic and decides whether to allow or block specific traffic based on a defined set of security rules.

2. Firewalls have been a first line of defense in network security for over 25 years. They establish a barrier between secured and controlled internal networks that can be trusted and untrusted outside networks, such as the Internet.

3. A firewall can be hardware, software, or both. It is often used to prevent unauthorized Internet users from accessing private networks connected to the Internet, especially intranets.

4. All messages entering or leaving the intranet pass through the firewall, which examines each message and blocks those that do not meet the specified security criteria.

So, in the context of the question, a Firewall is the best security solution to prevent unauthorized external access to an organization's internal network.