The correct answer is that the translations are functioning correctly, as the static NAT and dynamic PAT entries coexist without conflict. This is because the static NAT entry maps inbound web traffic on ports 80 and 443 to the host’s private IP using a dedicated global address (203.0.113.10), while the dynamic PAT entry uses a different global address (203.0.113.1) with a high ephemeral port for an outbound client connection. On the CCNA 200-301 v2 exam, this scenario tests your understanding that NAT and PAT can operate simultaneously on the same host as long as the global IP addresses and port ranges do not overlap—a common trap is assuming any duplicate inside host indicates a misconfiguration. The key distinction is that static NAT provides fixed inbound access for specific services, while dynamic PAT handles outbound source port translation. Remember the memory tip: “Different global IPs, different jobs—static for inbound services, PAT for outbound sessions.”
CCNA Network Services and Security Practice Question
This 200-301 practice question tests your understanding of network services and security. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Exhibit
R1# show ip nat translations
Pro Inside global Inside local Outside local Outside global
tcp 203.0.113.10:80 192.168.1.10:80 --- ---
tcp 203.0.113.10:443 192.168.1.10:443 --- ---
tcp 203.0.113.1:49152 192.168.1.10:49152 198.51.100.5:80 198.51.100.5:80
tcp 203.0.113.1:49153 192.168.1.11:49153 198.51.100.6:443 198.51.100.6:443
udp 203.0.113.1:49154 192.168.1.11:49154 8.8.8.8:53 8.8.8.8:53
icmp 203.0.113.1:3 192.168.1.12:3 8.8.4.4:3 8.8.4.4:3
tcp 203.0.113.1:49155 192.168.1.12:49155 203.0.113.50:22 203.0.113.50:22
Total number of translations: 7
Refer to the exhibit. A network administrator is reviewing the NAT translations on router R1 and notices that the internal host 192.168.1.10 appears in both a static NAT entry (for ports 80 and 443) using global address 203.0.113.10, and a dynamic PAT entry (port 49152) using global address 203.0.113.1. The administrator is concerned this might indicate a misconfiguration. Based on the output, which statement is correct?
R1# show ip nat translations
Pro Inside global Inside local Outside local Outside global
tcp 203.0.113.10:80 192.168.1.10:80 --- ---
tcp 203.0.113.10:443 192.168.1.10:443 --- ---
tcp 203.0.113.1:49152 192.168.1.10:49152 198.51.100.5:80 198.51.100.5:80
tcp 203.0.113.1:49153 192.168.1.11:49153 198.51.100.6:443 198.51.100.6:443
udp 203.0.113.1:49154 192.168.1.11:49154 8.8.8.8:53 8.8.8.8:53
icmp 203.0.113.1:3 192.168.1.12:3 8.8.4.4:3 8.8.4.4:3
tcp 203.0.113.1:49155 192.168.1.12:49155 203.0.113.50:22 203.0.113.50:22
Total number of translations: 7
A
The translations are functioning correctly; the static entries allow inbound web traffic to the host, while the dynamic PAT entry supports an outbound client connection.
The static mappings for ports 80 and 443 (global 203.0.113.10 → 192.168.1.10) are not overridden because the dynamic PAT entry uses a different global address (203.0.113.1) and a different source port (49152). This separation enables both inbound server traffic and outbound client traffic for the same inside host, which is a valid design.
B
The static NAT rule is being overridden by the dynamic PAT rule, causing inbound web traffic to the server to fail.
Why wrong: The dynamic PAT entry does not override the static NAT because they use different global IPs and ports. Static NAT entries remain active for the specific ports they map, and the router will use the static entry for inbound traffic matching 203.0.113.10:80 or 443.
C
The dynamic PAT entry indicates a duplicate session that will cause asymmetric routing and packet drops.
Why wrong: The dynamic PAT entry (port 49152) is a separate outbound flow from 192.168.1.10 to an external server, distinct from the static web server mapping. It does not duplicate the static entries and will not cause asymmetric routing because address and port combinations are unique.
D
The router is incorrectly performing both static and dynamic NAT for the same inside address, which violates the configured NAT order.
Why wrong: NAT order of operation allows both static and dynamic translations; static entries are processed first for traffic that matches them. The router does not automatically reject a dynamic PAT entry for the same address as long as the global address/port combinations are unique.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The translations are functioning correctly; the static entries allow inbound web traffic to the host, while the dynamic PAT entry supports an outbound client connection.
The output shows static NAT entries mapping TCP ports 80 and 443 from global 203.0.113.10 to inside host 192.168.1.10. Simultaneously, a dynamic PAT entry maps a high ephemeral port 49152 to the same inside host for an outbound connection to 198.51.100.5:80. Because the static entries use a different global IP (203.0.113.10) and different port numbers than the dynamic PAT entry (203.0.113.1:49152), both can coexist correctly — static NAT handles inbound web requests, dynamic PAT handles outbound client traffic. This is a normal operational state, not a misconfiguration.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
The translations are functioning correctly; the static entries allow inbound web traffic to the host, while the dynamic PAT entry supports an outbound client connection.
Why this is correct
The static mappings for ports 80 and 443 (global 203.0.113.10 → 192.168.1.10) are not overridden because the dynamic PAT entry uses a different global address (203.0.113.1) and a different source port (49152). This separation enables both inbound server traffic and outbound client traffic for the same inside host, which is a valid design.
Related concept
Static NAT maps one inside address to one outside address.
✗
The static NAT rule is being overridden by the dynamic PAT rule, causing inbound web traffic to the server to fail.
Why it's wrong here
The dynamic PAT entry does not override the static NAT because they use different global IPs and ports. Static NAT entries remain active for the specific ports they map, and the router will use the static entry for inbound traffic matching 203.0.113.10:80 or 443.
✗
The dynamic PAT entry indicates a duplicate session that will cause asymmetric routing and packet drops.
Why it's wrong here
The dynamic PAT entry (port 49152) is a separate outbound flow from 192.168.1.10 to an external server, distinct from the static web server mapping. It does not duplicate the static entries and will not cause asymmetric routing because address and port combinations are unique.
✗
The router is incorrectly performing both static and dynamic NAT for the same inside address, which violates the configured NAT order.
Why it's wrong here
NAT order of operation allows both static and dynamic translations; static entries are processed first for traffic that matches them. The router does not automatically reject a dynamic PAT entry for the same address as long as the global address/port combinations are unique.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
✓The translations are functioning correctly; the static entries allow inbound web traffic to the host, while the dynamic PAT entry supports an outbound client connection.Correct answer▾
Why this is correct
The static mappings for ports 80 and 443 (global 203.0.113.10 → 192.168.1.10) are not overridden because the dynamic PAT entry uses a different global address (203.0.113.1) and a different source port (49152). This separation enables both inbound server traffic and outbound client traffic for the same inside host, which is a valid design.
✗The static NAT rule is being overridden by the dynamic PAT rule, causing inbound web traffic to the server to fail.Wrong answer — click to see why▾
Why this is wrong here
A common misconception is that any dynamic NAT entry for the same inside local address takes precedence or conflicts with static entries. In reality, the more specific static mapping takes priority for matching traffic, and the dynamic entry handles unrelated flows.
✗The dynamic PAT entry indicates a duplicate session that will cause asymmetric routing and packet drops.Wrong answer — click to see why▾
Why this is wrong here
Candidates may misinterpret the presence of the same inside local IP in two entries as a duplicate session. Asymmetric routing would require inconsistent state in both directions, but here the NAT table correctly tracks distinct flows.
✗The router is incorrectly performing both static and dynamic NAT for the same inside address, which violates the configured NAT order.Wrong answer — click to see why▾
Why this is wrong here
Some candidates believe that a single inside address can only participate in one type of NAT at a time. In fact, multiple NAT rules can coexist, and the router will use the most specific match (static port mapping) before falling back to dynamic PAT for unmapped ports.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 200-301 question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 200-301 NAT questions on configuration and troubleshooting.
Network Services and Security — This question tests Network Services and Security — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The translations are functioning correctly; the static entries allow inbound web traffic to the host, while the dynamic PAT entry supports an outbound client connection. — The output shows static NAT entries mapping TCP ports 80 and 443 from global 203.0.113.10 to inside host 192.168.1.10. Simultaneously, a dynamic PAT entry maps a high ephemeral port 49152 to the same inside host for an outbound connection to 198.51.100.5:80. Because the static entries use a different global IP (203.0.113.10) and different port numbers than the dynamic PAT entry (203.0.113.1:49152), both can coexist correctly — static NAT handles inbound web requests, dynamic PAT handles outbound client traffic. This is a normal operational state, not a misconfiguration.
What should I do if I get this 200-301 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 200-301 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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