CISSP-ISSAP · Question #72
Which of the following components come under the network layer of the OSI model? Each correct answer represents a complete solution. Choose two.
The correct answer is A. Routers C. Firewalls. Routers (A) are the primary Layer 3 devices, directing traffic between networks using logical IP addressing - this is the defining function of the network layer. Firewalls (C) also operate at Layer 3 when performing packet filtering based on IP addresses and routing rules…
Question
Which of the following components come under the network layer of the OSI model? Each correct answer represents a complete solution. Choose two.
Options
- ARouters
- BMAC addresses
- CFirewalls
- DHub
How the community answered
(24 responses)- A92% (22)
- B4% (1)
- D4% (1)
Explanation
Routers (A) are the primary Layer 3 devices, directing traffic between networks using logical IP addressing - this is the defining function of the network layer. Firewalls (C) also operate at Layer 3 when performing packet filtering based on IP addresses and routing rules, making them a network layer component in this context.
Why the distractors are wrong:
- MAC addresses (B) belong to Layer 2 (Data Link layer); they identify devices on a local network segment, not across routed networks.
- Hubs (D) operate at Layer 1 (Physical layer); they simply repeat electrical signals and have no awareness of addresses whatsoever.
Memory tip: Think "Layer 3 = IP = Routes traffic intelligently" - if a device makes decisions based on IP addresses (routers, packet-filtering firewalls), it's Layer 3. If it uses MAC addresses, it's Layer 2; if it's just a signal repeater with no logic, it's Layer 1.
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