220-802 · Question #774
Which of the following describes the function of a firewall?
The correct answer is D. Hardware or software designed to block certain packets from entering or leaving a network. A firewall is defined by its ability to permit or deny packets based on configured rules about source, destination, port, or protocol.
Question
Which of the following describes the function of a firewall?
Options
- AHardware or software designed to analyze data packets to determine the origin or destination of the packet
- BHardware or software designed to block packets based on traffic behavior over time
- CHardware or software designed to compare data packets to known signatures
- DHardware or software designed to block certain packets from entering or leaving a network
How the community answered
(30 responses)- B3% (1)
- C10% (3)
- D87% (26)
Why each option
A firewall is defined by its ability to permit or deny packets based on configured rules about source, destination, port, or protocol.
Analyzing packets to determine origin or destination describes a packet analyzer or network sniffer, not a firewall.
Blocking packets based on traffic behavior over time describes an Intrusion Detection or Prevention System (IDS/IPS) using behavioral analysis.
Comparing packets to known signatures describes signature-based antivirus software or a signature-based IDS, not a firewall.
A firewall is hardware or software that inspects packets against a rule set and blocks or allows them from entering or leaving a network based on criteria such as IP address, port, or protocol. This packet filtering function is the foundational definition of a firewall.
Concept tested: Firewall definition and packet filtering function
Source: https://learn.microsoft.com/en-us/windows/security/operating-system-security/network-security/windows-firewall/
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