What does Static Network Address Translation allow?

What does Static Network Address Translation allow?

• A. It allows a single public IP address to be permanently mapped to a specific internal IP address.
• B. It enables dynamic mapping of many private IPs to one public IP.
• C. It translates internal addresses to public addresses for a session.
• D. It maps a private IP to a public IP for a session.

Answer: (A)

Static NAT provides a fixed one-to-one mapping between a private IP address and a public IP address. This means a particular internal host always appears on the Internet with the same public IP, and that public IP always routes back to that same internal host. This permanence makes it ideal for servers or devices that must be consistently reachable from outside the network, since firewall rules, DNS entries, and access might rely on a stable address. In contrast, dynamic NAT assigns public addresses from a pool as needed, so mappings can change over time and a given internal address might not always map to the same external IP. Other NAT forms (like PAT) map many private addresses to a smaller number of public IPs using ports, which is a many-to-one or per-session mapping rather than a fixed one-to-one relationship.

Static NAT provides a fixed one-to-one mapping between a private IP address and a public IP address. This means a particular internal host always appears on the Internet with the same public IP, and that public IP always routes back to that same internal host. This permanence makes it ideal for servers or devices that must be consistently reachable from outside the network, since firewall rules, DNS entries, and access might rely on a stable address.

In contrast, dynamic NAT assigns public addresses from a pool as needed, so mappings can change over time and a given internal address might not always map to the same external IP. Other NAT forms (like PAT) map many private addresses to a smaller number of public IPs using ports, which is a many-to-one or per-session mapping rather than a fixed one-to-one relationship.