NAT and PAT questions cover static NAT (one-to-one), dynamic NAT (pool-based), and PAT/overload (many-to-one using port numbers). The CCNA asks you to read NAT table output, fix misconfigured NAT, and match the right NAT type to a scenario.
Start Scenario PracticeAn engineer wants to configure NAT on a Cisco ASA such that multiple internal hosts share a single public IP address when accessing the internet. Which NAT type should be used?
Explanation: PAT (Port Address Translation) or NAT overload allows multiple internal hosts to share a single public IP by using unique port numbers.
A network administrator is configuring NAT on a Cisco ASA to allow internal users to access the internet using a single public IP address. The internal network uses RFC 1918 addresses. Which type of NAT should be configured?
Explanation: PAT (Port Address Translation) allows many internal IPs to share a single public IP by using unique source ports. Dynamic NAT would require a pool of public IPs, and static NAT provides one-to-one mapping.
A network engineer is configuring NAT on a Cisco ASA for internal servers to be accessible from the internet. One server (10.1.1.10) must always be reachable via a fixed public IP (203.0.113.10). Which NAT type should be used?
Explanation: Static NAT provides a one-to-one fixed mapping between a private IP and a public IP, ensuring the server is always reachable via the same public address.
A Cisco ASA is configured with dynamic PAT to translate internal addresses to a single outside IP address. A user on the inside initiates a connection to an external web server. The ASA creates a connection entry. Which table is checked first when a return packet arrives from the web server?
Explanation: When a return packet arrives from the web server, the ASA first checks the connection table (conn) to match the packet against an existing flow. The connection table entry was created when the inside user initiated the session and contains the translation and session state. This fast-path lookup allows the ASA to forward the packet without re-evaluating ACLs or performing a new NAT translation.
On a Cisco ASA, which NAT type allows multiple internal hosts to share a single public IP address by using different source ports?
Explanation: PAT (Port Address Translation), also called NAT overload, allows many internal hosts to share a single public IP address by translating both the source IP and source port. The ASA tracks each flow using unique source ports, enabling multiplexing of thousands of sessions over one public address. This is the standard NAT type for internet-bound traffic from internal networks.
NAT and PAT questions cover static NAT (one-to-one), dynamic NAT (pool-based), and PAT/overload (many-to-one using port numbers). The CCNA asks you to read NAT table output, fix misconfigured NAT, and match the right NAT type to a scenario. These appear throughout the 350-701 and require you to apply your knowledge, not just recall facts.
Cisco doesn't publish an exact breakdown, but scenario-based questions (especially exhibit and command-output formats) make up a significant portion of the 350-701. Practicing each scenario type ensures you're ready for any format.
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