This 200-901 practice question tests your understanding of network fundamentals. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Which THREE of the following are characteristics of IPv6? (Select exactly three.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
IPv6 does not have a built-in NAT requirement.
IPv6 has a 128-bit address space, uses SLAAC for autoconfiguration, and does not support NAT as a design requirement (though NPTv6 exists). Options B, C, and D are correct. Option A is wrong because IPv6 addresses are 128-bit. Option E is wrong because IPv6 uses NDP instead of ARP.
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.
✓
IPv6 does not have a built-in NAT requirement.
Why this is correct
IPv6 was designed with enough address space to avoid NAT.
Related concept
Static NAT maps one inside address to one outside address.
✓
IPv6 uses a 128-bit address space.
Why this is correct
Correct, 128-bit addresses.
Related concept
Static NAT maps one inside address to one outside address.
SLAAC allows hosts to configure an address without DHCP.
Related concept
Static NAT maps one inside address to one outside address.
✗
IPv6 uses ARP to resolve MAC addresses.
Why it's wrong here
IPv6 uses Neighbor Discovery Protocol (NDP) instead of ARP.
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.
What to study next
Got this wrong? Here's your next step.
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 200-901 NAT questions on configuration and troubleshooting.
Network Fundamentals — This question tests Network Fundamentals — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: IPv6 does not have a built-in NAT requirement. — IPv6 has a 128-bit address space, uses SLAAC for autoconfiguration, and does not support NAT as a design requirement (though NPTv6 exists). Options B, C, and D are correct. Option A is wrong because IPv6 addresses are 128-bit. Option E is wrong because IPv6 uses NDP instead of ARP.
What should I do if I get this 200-901 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 200-901 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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Question Discussion
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