Which of the following components come under the network layer of the OSI model? Each correct answer represents a complete solution. Choose two.

Question

Options

• ARouters
• BMAC addresses
• CFirewalls
• DHub

• A
  92% (22)
• B
  4% (1)
• D
  4% (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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