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Cisco Certified Network Associate (CCNA) · Cisco
Select one answer.
Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
The correct answer is B. firewall. A firewall is a network security device that monitors, permits, or blocks traffic based on a defined set of security rules. It's designed to establish a barrier between a trusted internal network and untrusted external networks, like the internet. Unlike switches, wireless controllers, or access points, which manage traffic flow or connectivity, firewalls enforce access control policies to protect the network.
+ ACL is a set of rules, not a device
Why not D? Access-list (ACL) is a set of rules defined for controlling network traffic and reducing network attacks