Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
Exhibit: After PAT is configured, inside users can browse the internet, but the engineer wants to verify that translations are actually being created. Which command is the best choice?
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
Distractor review
show access-lists
That may show ACL hits but not the active NAT translation table itself.
B
Best answer
show ip nat translations
This directly displays the current NAT entries.
C
Distractor review
show ip route
The routing table does not show per-flow NAT translations.
D
Distractor review
debug ip packet detail
That is far more intrusive than needed for a basic verification.
Common exam trap
Common exam trap: answer the scenario, not the keyword
A common exam trap is choosing 'show access-lists' or 'show ip route' to verify NAT translations. While ACLs and routing tables are important for network security and path selection, they do not display active NAT translation entries. Another tempting but incorrect choice is 'debug ip packet detail', which provides excessive information and can overwhelm the candidate, making it unsuitable for simple verification. The correct command, 'show ip nat translations', directly reveals the current NAT table, confirming whether PAT translations are being created and maintained.
Technical deep dive
How to think about this question
Network Address Translation (NAT) is a fundamental technology in Cisco networking that allows private IP addresses used inside a network to be translated into public IP addresses for communication over the internet. Port Address Translation (PAT), a type of NAT, enables multiple devices on a local network to share a single public IP address by differentiating sessions using unique source port numbers. This translation process creates entries in a NAT translation table that maps inside local addresses and ports to inside global addresses and ports, enabling return traffic to be correctly routed back to the originating device. The command 'show ip nat translations' is the primary method to verify active NAT or PAT translations on Cisco routers. This command displays the current translation table entries, showing inside local addresses (private IPs), inside global addresses (public IPs), and the associated port numbers. By examining this output, network engineers can confirm that PAT is functioning correctly and that inside users have active translations allowing them to browse the internet. Other commands like 'show access-lists' or 'show ip route' do not provide this translation information, and debug commands, while detailed, are too intrusive for routine verification. A common confusion arises when candidates mistake ACLs or routing tables as sources for NAT translation verification. ACLs control which traffic is permitted or denied but do not show translation states. Routing tables determine packet forwarding paths but do not track NAT sessions. Debug commands can overwhelm with packet-level details and are not recommended for simple checks. Understanding the role of 'show ip nat translations' helps avoid these traps and supports efficient troubleshooting and validation of PAT configurations in Cisco environments.
KKey Concepts to Remember
- Network Address Translation (NAT) translates private inside local IP addresses to public inside global IP addresses for internet communication.
- Port Address Translation (PAT) allows multiple inside hosts to share a single public IP by mapping different source ports to unique translations.
- The command 'show ip nat translations' displays the active NAT translation table, showing inside local and inside global addresses with port mappings.
- Access Control Lists (ACLs) control traffic flow but do not display active NAT translation entries or confirm translation creation.
- The routing table shows network paths and next hops but does not provide information about individual NAT translations or sessions.
- Debug commands like 'debug ip packet detail' provide detailed packet-level information but are intrusive and not ideal for simple NAT verification.
- Verifying NAT translations with 'show ip nat translations' helps confirm that PAT is functioning correctly and inside users can access external networks.
- Understanding NAT translation entries is critical for troubleshooting connectivity issues related to address translation and port mappings.
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.
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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?
Network Address Translation (NAT) translates private inside local IP addresses to public inside global IP addresses for internet communication.
What is the correct answer to this question?
The correct answer is: show ip nat translations — The NAT translation table shows the inside local and inside global addresses and confirms whether active translations are being built.
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.
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