20+ practice questions focused on NAT and DHCP — one of the most tested topics on the ENCOR 350-401 exam. Each question includes a detailed explanation so you learn why the right answer is correct.
Start NAT and DHCP PracticeA network engineer is configuring a Cisco router to provide internet access to a small office using a single public IP address assigned by the ISP. The engineer wants to allow internal hosts to initiate connections to the internet, but also needs to make a web server on the internal network reachable from the internet. The engineer configures a standard access list for NAT and an ip nat inside source list command. However, external users cannot reach the internal web server. What is the most likely cause?
Explanation: The scenario requires both dynamic NAT (for outbound traffic) and static NAT (for inbound access to the web server). Using only a dynamic NAT configuration with an access list will not provide a permanent mapping for the web server.
A network engineer is troubleshooting a DHCP issue on a Cisco router configured as a DHCP server for a VLAN. Clients in the VLAN are able to obtain IP addresses from the DHCP server, but they are not receiving the correct DNS server address. The engineer checks the DHCP pool configuration and sees the dns-server command is configured with the correct IP address. What is the most likely cause of the problem?
Explanation: The DHCP server configuration appears correct, but the clients are not receiving the DNS server address. This often happens when the DHCP server is not the default gateway and DHCP relay is involved, or when the DHCP pool is not bound to the correct interface.
A network engineer is configuring NAT overload (PAT) on a Cisco router to allow multiple internal hosts to share a single public IP address. The engineer uses the command ip nat inside source list 1 interface GigabitEthernet0/0 overload. After testing, internal hosts can access the internet, but some applications fail intermittently. The engineer suspects a NAT issue. What is the most likely cause?
Explanation: PAT uses port numbers to multiplex multiple sessions over a single public IP. If the port range is exhausted or if the NAT translation table is full, new sessions will fail.
A network engineer is configuring a Cisco router as a DHCP relay agent to forward DHCP requests from a client VLAN to a centralized DHCP server located in a different subnet. The engineer configures the ip helper-address command on the VLAN interface. However, clients in the VLAN are not receiving IP addresses. The DHCP server is reachable from the router. What is the most likely cause?
Explanation: The ip helper-address command forwards DHCP broadcasts as unicasts to the specified server. If the DHCP server receives the request but the reply cannot be routed back to the client, the client will not get an address. This often happens when the router does not have a route back to the client subnet.
A network engineer is troubleshooting a NAT issue where an internal host cannot establish an SSH session to a remote server on the internet. The engineer checks the NAT translations on the border router and sees that the translation for the host's source IP is present. However, the SSH session times out. The engineer also notices that the remote server's IP is not in the NAT translation table. What is the most likely cause?
Explanation: For a successful NAT session, both the outbound and inbound translations must be present. If only the outbound translation exists, the return traffic is not being translated back correctly, possibly due to asymmetric routing or a missing route.
+15 more NAT and DHCP questions available
Practice all NAT and DHCP questions1. Baseline your knowledge
Start with 10 questions to gauge your current understanding of NAT and DHCP. This tells you whether you need a concept refresher or just practice.
2. Review every explanation
For each question — right or wrong — read the full explanation. Understanding why an answer is correct is more valuable than knowing the answer itself.
3. Focus on exam traps
NAT and DHCP questions on the 350-401 frequently use trap wording. Look for subtle differences in answers that test your precision, not just general knowledge.
4. Reach 80% consistently
Do repeated sessions until you score 80%+ three times in a row. Then move to mixed-mode practice to test cross-topic recall under realistic conditions.
The exact number varies per candidate. NAT and DHCP is tested as part of the ENCOR 350-401 blueprint. Practicing with targeted NAT and DHCP questions ensures you can handle any format or difficulty that appears.
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Difficulty is subjective, but NAT and DHCP is a high-priority exam concept tested in multiple ways — direct recall, scenario analysis, and command-output interpretation. Consistent practice is the best way to build confidence.
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