CERTIFIED-IN-CYBERSECURITY · Question #34
Which of the following types of devices inspect packet header information to either allow or deny network traffic?
The correct answer is B. Firewalls. Firewalls are network security devices that examine packet header fields - such as source and destination IP addresses, port numbers, and protocols - and apply rule sets to permit or block traffic accordingly. Packet-filtering firewalls operate at Layer 3/4 and are the classic…
Question
Which of the following types of devices inspect packet header information to either allow or deny network traffic?
Options
- ARouters
- BFirewalls
- CHubs
- DSwitches
How the community answered
(33 responses)- B91% (30)
- C6% (2)
- D3% (1)
Explanation
Firewalls are network security devices that examine packet header fields - such as source and destination IP addresses, port numbers, and protocols - and apply rule sets to permit or block traffic accordingly. Packet-filtering firewalls operate at Layer 3/4 and are the classic example. Routers forward packets based on destination addresses but do not inherently apply security policies. Hubs operate at Layer 1 and simply broadcast signals. Switches operate at Layer 2 using MAC addresses for forwarding - neither hubs nor switches perform security filtering on packet headers.
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