Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
A router is configured with a static NAT mapping for an internal server. What is the main operational advantage of this design for outside clients?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Best answer
The server is represented by a fixed public address that outside clients can reach predictably
This is correct because static NAT creates a stable one-to-one mapping.
B
Distractor review
The server automatically shares its public address with all inside users through overload
This is wrong because overload is a PAT concept, not the defining behavior of static NAT.
C
Distractor review
The server no longer needs an IP address on the internal network
This is wrong because the server still needs a valid internal IP address.
D
Distractor review
The mapping removes the need for routing to the server
This is wrong because routing still matters even when NAT is in use.
Common exam trap
Common exam trap: answer the scenario, not the keyword
A frequent exam trap is confusing static NAT with PAT (Port Address Translation). While PAT allows many internal devices to share one public IP by using different port numbers, static NAT assigns a fixed public IP to a single internal device. Selecting an answer that suggests the server shares its public address with all inside users (like option B) is incorrect because static NAT does not perform address overload. Another trap is assuming static NAT removes the need for routing; however, routing is still required to forward packets to the internal server. Misunderstanding these differences can lead to incorrect answers about NAT behavior and design advantages.
Technical deep dive
How to think about this question
Static NAT (Network Address Translation) is a one-to-one mapping between a private internal IP address and a fixed public IP address. This mapping allows an internal server to be reachable from external networks using a consistent public IP, which is essential for services like web hosting or email servers. Unlike dynamic NAT or PAT, static NAT does not change the public IP address assigned to the internal device, ensuring predictable external accessibility. In Cisco networking and the CCNA context, static NAT is configured to provide a stable external identity for internal resources. When outside clients attempt to reach the server, they use the fixed public IP address defined by the static NAT entry. This predictability simplifies access control, firewall rules, and DNS configurations, as the server's public-facing address never changes. The router translates incoming packets destined for the public IP to the internal server's private IP, maintaining seamless communication. A common exam trap is confusing static NAT with PAT (Port Address Translation). PAT allows multiple internal hosts to share a single public IP by differentiating sessions with port numbers, which is not suitable for servers needing a fixed public address. Another pitfall is assuming static NAT eliminates the need for routing; routing remains necessary to forward packets correctly to the internal server. Understanding these distinctions is critical for correctly answering questions about NAT behavior and design advantages.
KKey Concepts to Remember
- Static NAT creates a permanent one-to-one mapping between an internal private IP address and a fixed public IP address for predictable external reachability.
- Outside clients use the fixed public IP address assigned by static NAT to reliably access internal servers or services.
- Static NAT differs from PAT by providing a stable external IP rather than sharing one IP among multiple internal hosts using port numbers.
- Routing remains essential for directing traffic to the internal server even when static NAT is configured on the router.
- Static NAT simplifies firewall and DNS configurations by maintaining a consistent public IP address for the internal server.
- Static NAT is commonly used for inside services that require inbound connections from external networks, such as web or mail servers.
- Dynamic NAT assigns public IPs from a pool temporarily, but static NAT guarantees a fixed public IP for the internal device.
- PAT overload allows many internal users to share a single public IP, which is unsuitable for servers needing a dedicated external address.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Related practice questions
Related 200-301 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
CCNA subnetting practice questions
Practise IPv4 subnetting, CIDR, masks, host ranges and subnet selection.
CCNA OSPF practice questions
Practise OSPF neighbours, router IDs, metrics, areas and routing-table interpretation.
CCNA VLAN practice questions
Practise VLANs, access ports, trunks, allowed VLANs and switching scenarios.
CCNA STP practice questions
Practise spanning tree, root bridge election, port roles and STP troubleshooting.
CCNA EtherChannel practice questions
Practise LACP, PAgP, port-channel behaviour and bundle requirements.
CCNA ACL practice questions
Practise standard and extended ACLs, permit/deny logic and traffic filtering.
CCNA NAT practice questions
Practise static NAT, dynamic NAT, PAT and inside/outside address translation.
CCNA DHCP practice questions
Practise DHCP scopes, relay, leases and troubleshooting.
CCNA show ip route practice questions
Practise routing-table output, longest-prefix match, AD and route selection.
CCNA show interfaces trunk practice questions
Practise trunk verification and VLAN forwarding across switches.
CCNA wireless security practice questions
Practise WLAN security, authentication and wireless architecture concepts.
CCNA IPv6 practice questions
Practise IPv6 addressing, routes, neighbour discovery and common IPv6 exam traps.
More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A router learns the same prefix from both OSPF and EIGRP. Which route is installed by default?
Question 2
A router shows this output: R1#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 10.1.1.2 1 FULL/DR 00:00:34 192.168.12.2 GigabitEthernet0/0 10.1.1.3 1 2WAY/DROTHER 00:00:39 192.168.12.3 GigabitEthernet0/0 Which statement is correct?
Question 3
What is the OSPF metric called?
Question 4
A non-root switch has two uplinks toward the root bridge. One path has a lower total STP cost than the other. What role will the lower-cost uplink have?
Question 5
A router interface applies this ACL inbound: 10 deny tcp any any eq 80 20 permit ip any any A user reports that web browsing to a server by IP address fails, but ping works. Which statement best explains the behavior?
Question 6
A router learns route 198.51.100.0/24 from OSPF with AD 110 and also has a static route to the same prefix configured with AD 150. Which route is installed?
FAQ
Questions learners often ask
What does this 200-301 question test?
Static NAT creates a permanent one-to-one mapping between an internal private IP address and a fixed public IP address for predictable external reachability.
What is the correct answer to this question?
The correct answer is: The server is represented by a fixed public address that outside clients can reach predictably — The main operational advantage is predictability. In plain language, outside clients always know which public IP address represents the internal server. That stable one-to-one mapping makes the server easier to reach consistently from external networks. This is exactly why static NAT is commonly used for inside services that need outside reachability. This differs from PAT, which is optimized for many outbound user sessions sharing fewer public addresses. Static NAT is valuable when a specific device or service must have a stable external identity.
What should I do if I get this 200-301 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
Discussion
Loading comments…
Sign in to join the discussion.