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Question 359 of 1,052
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CCNA Practice Question: Which TWO statements correctly describe the…
This 200-301 practice question tests your understanding of 200-301 exam topics. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 TWO statements correctly describe the behavior of standard ACLs and their placement on interfaces?
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
✓
Standard ACLs filter traffic based on source IP address only.
Standard ACLs filter traffic based solely on the source IP address, so they should be placed as close to the destination as possible to avoid blocking legitimate traffic before it reaches its intended destination. They cannot filter based on destination IP, protocol, or port number. Distractors either describe extended ACLs, misstate placement rules, or give incorrect filtering capabilities.
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.
- ✓
Standard ACLs filter traffic based on source IP address only.
Why this is correct
Standard ACLs use only the source IP address (or a wildcard mask) to match packets; they do not consider destination, protocol, or port.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
Standard ACLs should be placed as close to the source as possible.
Why it's wrong here
Standard ACLs cannot filter by destination, so placing them close to the source may block traffic that should be allowed to other destinations. They should be placed close to the destination.
- ✗
Standard ACLs can filter traffic based on destination IP address.
Why it's wrong here
Standard ACLs do not examine the destination IP address; they only check the source.
- ✓
Standard ACLs should be placed as close to the destination as possible.
Why this is correct
Because standard ACLs only check source addresses, placing them near the destination prevents blocking traffic that is permitted to other networks along the path.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
Standard ACLs can filter traffic based on TCP or UDP port numbers.
Why it's wrong here
Filtering by port numbers requires an extended ACL that can examine Layer 4 headers.
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.
✓Standard ACLs filter traffic based on source IP address only.Correct answer▾
Why this is correct
Standard ACLs use only the source IP address (or a wildcard mask) to match packets; they do not consider destination, protocol, or port.
✗Standard ACLs should be placed as close to the source as possible.Wrong answer — click to see why▾
Why this is wrong here
Extended ACLs are placed close to the source; standard ACLs are placed close to the destination.
✗Standard ACLs can filter traffic based on destination IP address.Wrong answer — click to see why▾
Why this is wrong here
Only extended or named ACLs can filter on destination IP.
✗Standard ACLs can filter traffic based on TCP or UDP port numbers.Wrong answer — click to see why▾
Why this is wrong here
Port filtering is only possible with extended ACLs.
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.
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 200-301 NAT questions on configuration and troubleshooting.
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FAQ
Questions learners often ask
What does this 200-301 question test?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: Standard ACLs filter traffic based on source IP address only. — Standard ACLs filter traffic based solely on the source IP address, so they should be placed as close to the destination as possible to avoid blocking legitimate traffic before it reaches its intended destination. They cannot filter based on destination IP, protocol, or port number. Distractors either describe extended ACLs, misstate placement rules, or give incorrect filtering capabilities.
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.
About these practice questions
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