Which of the following is not a security risk?

Correct option is B

​A firewall is a security tool used to protect networks from unauthorized access and is not a security risk. It works by monitoring and controlling incoming and outgoing network traffic based on predetermined security rules.

Information Booster:

1. A firewall is a network security device designed to monitor, filter, and control incoming and outgoing network traffic based on predetermined security rules. The primary purpose of a firewall is to establish a barrier between a trusted internal network and untrusted external networks.

2. Firewalls come in both hardware and software forms, and they work by inspecting data packets and determining whether to allow or block them based on a set of rules. Organizations can configure these rules to permit or deny traffic based on various criteria, such as source and destination IP addresses, port numbers, and protocol type. 

3. Firewalls protect against malicious traffic. They’re strategically positioned at the network edge or in a data center, allowing them to closely monitor anything attempting to cross this boundary.

​Additional Knowledge:

1. Hacking: Hackers use various techniques to exploit vulnerabilities in systems to gain unauthorized access. It can lead to data theft, malware installation, and other cybercrimes.
2. Phishing: Phishing is often done via email or fake websites that appear legitimate but are used to steal personal information. It is a common form of social engineering attack.
3. Pharming: Pharming redirects legitimate website addresses to fraudulent sites, often without the user's knowledge, to steal login credentials and other sensitive information. 

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