200-301 Question #407: Real Exam Question with Answer & Explanation

Question

What is a network appliance that checks the state of a packet to determine whether the packet is legitimate?

Options

• ALayer 2 switch
• Bload balancer
• Cfirewall
• DLAN controller

Explanation

A firewall is a network security device that monitors incoming and outgoing network traffic, using predefined security rules to permit or block specific packets based on their state, source, destination, and other characteristics. This stateful inspection determines the legitimacy of traffic.

Common mistakes.

• A. A Layer 2 switch forwards frames based on MAC addresses and does not typically perform deep packet inspection or stateful analysis.
• B. A load balancer distributes incoming network traffic across multiple backend servers to ensure high availability and responsiveness; it does not primarily determine packet legitimacy based on state.
• D. A LAN controller typically manages and configures wireless access points or provides centralized control over local area network devices, not packet state inspection.

Concept tested. Firewall functions and stateful inspection

Reference. https://learn.microsoft.com/en-us/windows/security/threat-protection/windows-firewall/windows-firewall-with-advanced-security

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