Question 2,111 of 2,152

NAT and PAT →mediumMultiple ChoiceObjective-mapped

300-410 NAT and PAT Practice Question

This 300-410 practice question tests your understanding of nat and pat. 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.

A network engineer runs the following command on Router R1:

R1# show ip nat translations

Pro Inside global Inside local Outside local Outside global --- 192.0.2.10 10.0.0.10 --- ---

R1# show ip nat statistics

Total active translations: 1 (0 static, 1 dynamic; 0 extended) Outside interfaces: GigabitEthernet0/1 Inside interfaces: GigabitEthernet0/0 Hits: 0 Misses: 0 CEF Translated packets: 0, CEF Punted packets: 0 Expired translations: 0 Dynamic mappings: -- Inside Source

[Id] ip nat pool POOL1 192.0.2.10 192.0.2.20 netmask 255.255.255.240

refcount 1 map-id 1

[Id] ip nat inside source list ACL1 pool POOL1

refcount 1

Based on this output, what is the problem?

Question 1mediummultiple choice

Study the full ACL explanation →

A
The NAT translation exists but no traffic is being translated (0 hits, 0 misses), indicating a possible idle translation or no matching traffic.
The translation is present but no packets have been processed. This could be a stale entry or lack of traffic.
B
The NAT pool is exhausted.
Why wrong: Only one address is used out of 16.
C
PAT is misconfigured.
Why wrong: PAT is not configured; this is basic NAT.
D
The inside and outside interfaces are reversed.
Why wrong: The statistics show correct interface assignment.

Full breakdown with real-world context →

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 NAT translation exists but no traffic is being translated (0 hits, 0 misses), indicating a possible idle translation or no matching traffic.

The output shows 1 dynamic translation but 0 hits and 0 misses. This indicates that a translation entry exists (perhaps from a previous session or manual creation), but no packets have been translated. The 0 hits and 0 misses suggest that no traffic is flowing through the NAT. This could be due to the translation being stale or no traffic matching the ACL.

Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.

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 NAT translation exists but no traffic is being translated (0 hits, 0 misses), indicating a possible idle translation or no matching traffic.
Why this is correct
The translation is present but no packets have been processed. This could be a stale entry or lack of traffic.
Related concept
CIDR notation defines the prefix length.
✗
The NAT pool is exhausted.
Why it's wrong here
Only one address is used out of 16.
✗
PAT is misconfigured.
Why it's wrong here
PAT is not configured; this is basic NAT.
✗
The inside and outside interfaces are reversed.
Why it's wrong here
The statistics show correct interface assignment.

Common exam traps

Common exam trap: usable hosts are not the same as total addresses

Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.

Trap categories for this question

Command / output trap
The statistics show correct interface assignment.

Detailed technical explanation

How to think about this question

Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.

KKey Concepts to Remember

CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.

TExam Day Tips

Write the block size before choosing the subnet.
Check whether the question asks for hosts, subnets or a specific address range.
Do not confuse /24, /25, /26 and /27 host counts.

Key takeaway

Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.

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.

What to study next

Got this wrong? Here's your next step.

Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related 300-410 subnetting questions on CIDR, address ranges, and subnet selection.

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FAQ

Questions learners often ask

What does this 300-410 question test?

NAT and PAT — This question tests NAT and PAT — CIDR notation defines the prefix length..

What is the correct answer to this question?

The correct answer is: The NAT translation exists but no traffic is being translated (0 hits, 0 misses), indicating a possible idle translation or no matching traffic. — The output shows 1 dynamic translation but 0 hits and 0 misses. This indicates that a translation entry exists (perhaps from a previous session or manual creation), but no packets have been translated. The 0 hits and 0 misses suggest that no traffic is flowing through the NAT. This could be due to the translation being stale or no traffic matching the ACL.

What should I do if I get this 300-410 question wrong?

What is the key concept behind this question?

CIDR notation defines the prefix length.

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Last reviewed: Jun 19, 2026

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