Which device has the primary function of a router but includes firewall functionality embedded into its firmware?

Which device has the primary function of a router but includes firewall functionality embedded into its firmware?

• A. Router firewall
• B. Appliance firewall
• C. Layer 4 firewall
• D. Stateful inspection

Answer: (A)

The key idea is a device whose main job is routing but that also has firewall features built into its software. This is a router with integrated firewall capabilities, often called a router firewall. The firmware of such a device handles both routing and basic to moderate firewall tasks (like NAT, access controls, and simple filtering) without needing a separate firewall box. Why this fits best: the emphasis is on routing as the primary function with firewall functionality embedded within the same device’s software. A dedicated firewall appliance would be focused on firewalling rather than routing. A Layer 4 firewall describes how the firewall operates (at the transport layer), not the type of device. Stateful inspection describes a firewall technique that tracks connection states, not a device category.

The key idea is a device whose main job is routing but that also has firewall features built into its software. This is a router with integrated firewall capabilities, often called a router firewall. The firmware of such a device handles both routing and basic to moderate firewall tasks (like NAT, access controls, and simple filtering) without needing a separate firewall box.

Why this fits best: the emphasis is on routing as the primary function with firewall functionality embedded within the same device’s software. A dedicated firewall appliance would be focused on firewalling rather than routing. A Layer 4 firewall describes how the firewall operates (at the transport layer), not the type of device. Stateful inspection describes a firewall technique that tracks connection states, not a device category.