CCNA Network Services and Security Practice Question
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?
⚠ Common exam trap
Cisco often tests the misconception that a single inside host cannot have both static NAT and dynamic PAT entries simultaneously, when in fact they can coexist as long as they use different global addresses or ports and serve different traffic flows.
Answer choices
Why each option matters
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.
Static NAT and dynamic PAT can coexist for the same inside host because they serve different purposes. The static NAT entries for ports 80 and 443 allow inbound web traffic from the internet to reach the internal server at 192.168.1.10 using global address 203.0.113.10. The dynamic PAT entry (port 49152) using global address 203.0.113.1 is a separate translation for an outbound connection initiated by the same host, which is normal behavior as the router maintains distinct translation entries based on direction and port.
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.
- ✗
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?”
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Key term
Port Address Translation
A networking technique that maps multiple private IP addresses and their ports to a single public IP address using unique port numbers.
Key term
Router
A router is a networking device that connects different networks together and directs data traffic between them by choosing the best path for data to travel.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 200-301 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 200-301 exam.