CV0-003 Question #100: Real Exam Question with Answer & Explanation

The correct answer is C: NAT. NAT (Network Address Translation) is the mechanism a firewall uses to redirect incoming traffic destined for a public IP address to an internal private host. This is a core function of perimeter firewalls and routers for inbound traffic forwarding.

Cloud Architecture and Design

Question

When a firewall takes an incoming request for a specific IP address and redirects it to an internal host, which of the following is being used?

Options

ANIS
BPAT
CNAT
DNIC

Explanation

NAT (Network Address Translation) is the mechanism a firewall uses to redirect incoming traffic destined for a public IP address to an internal private host. This is a core function of perimeter firewalls and routers for inbound traffic forwarding.

Common mistakes.

A. NIS (Network Information Service) is a Unix/Linux directory service protocol used to share configuration files across hosts, and has no role in IP address translation or traffic redirection.
B. PAT (Port Address Translation) maps multiple internal private IPs to a single public IP by differentiating sessions with unique port numbers, and is primarily used for outbound traffic from many internal hosts sharing one public address.
D. NIC (Network Interface Card) is physical hardware that connects a device to a network, and performs no address translation or traffic redirection.

Concept tested. NAT inbound traffic redirection to internal hosts

Reference. https://learn.microsoft.com/en-us/azure/firewall/tutorial-firewall-dnat

Topics

#NAT#port forwarding#firewall#network address translation

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