Firewall is used to protect-

Question: Firewall is used to protect-

Correct Answer: Unauthorized access</h3>

Firewalls are essential security devices in computer networks designed to prevent unauthorized access. They act as a barrier between internal networks (trusted zones) and external networks, such as the internet (untrusted zones). The primary function of a firewall is to enforce security policies by monitoring and controlling incoming and outgoing network traffic based on predetermined security rules.

Detailed Explanation:

Let's break down why 'Unauthorized access' is the correct choice:

1. Unauthorized Access:

Firewalls are most prominently used to prevent unauthorized access. This involves blocking or restricting access based on rules set by network administrators. Unauthorized access might involve hackers attempting to breach a network or users trying to access restricted segments. Firewalls inspect network packets to determine if they meet the security criteria established by the ruleset:

• Packet Filtering: Examining packets for the source and destination IP address, port number, and protocol.

• Stateful Inspection: Tracking the state of active connections and making decisions based on the context of the traffic.

• Proxy Services: Acting as an intermediary for requests from clients seeking resources from other servers.

2. Virus Attacks:

While firewalls can help in mitigating virus threats by blocking malicious traffic, they are not primarily designed for virus protection. Anti-virus software and Intrusion Detection Systems (IDS) or Intrusion Prevention Systems (IPS) are more suited for identifying and removing viruses.

3. Fire Attacks:

The term 'fire attacks' likely refers to physical fires, which are not within the scope of digital network protection. Firewalls do not provide any physical protection against fire hazards. This is typically managed by physical safety systems like smoke detectors and fire suppression systems.

4. Data-driven Attacks:

While firewalls can provide a layer of defense against some data-driven attacks by controlling traffic, they are not foolproof against sophisticated attacks like phishing, SQL injection, or other forms of malicious data manipulation. Advanced security measures such as application-layer firewalls, Web Application Firewalls (WAF), and other security practices are used to supplement firewall capabilities against such attacks.

Conclusion:

In summary, the primary role of a firewall is to protect against unauthorized access to a network. It functions by implementing security rules that control both inbound and outbound network traffic, significantly reducing the risk of unauthorized access and potential breaches.

For further reading, refer to these reputable sources:

Cisco: What is a Firewall?

Kaspersky: What is a Firewall?