Final answer:
To control network traffic, a Firewall is commonly used as it acts as a barrier between a private network and the public Internet, blocking malicious and allowing legitimate traffic. Access Control Lists can also be used to filter traffic more granularly. Discretionary Access Control and Address Resolution Protocol are not primarily used for this purpose. Option B is correct.
Step-by-step explanation:
To control the traffic that is allowed in or out of a network, you would typically use B. Firewall. A firewall is a network security device that monitors and filters incoming and outgoing network traffic based on an organization’s previously established security policies. At its most basic, a firewall is a barrier between a private internal network and the public Internet. The key function of a firewall is to protect private networks and devices from potentially harmful incoming and outgoing traffic, blocking malicious traffic like viruses and hackers, and allowing legitimate traffic to pass.
However, it is important to note that A. Access Control Lists (ACLs) are also used to control traffic, but they do so at a more granular level. ACLs are a series of rules that are used to filter traffic and are often used in conjunction with firewalls. D. Discretionary Access Control is another concept related to permissions within a system but is not specifically about network traffic. The C. Address Resolution Protocol is a protocol used for resolving IP addresses to machine (MAC) addresses and is not directly involved in controlling network traffic.