- A
Standard IPv4 ACLs use numbers in the range 100-199.
Why wrong: Standard numbered ACLs use 1–99 and 1300–1999; 100–199 and 2000–2699 are reserved for extended ACLs.
- B
Extended IPv4 ACLs should be placed as close to the source as possible to minimize unnecessary traffic on the network.
Extended ACLs can match traffic with great specificity (source, destination, protocol, ports). Placing them near the source drops unwanted packets early, saving bandwidth and processing on downstream devices.
- C
IPv6 ACLs are always named and can filter traffic based on source and destination IPv6 addresses, as well as protocol types.
IPv6 ACLs are only implemented as named extended ACLs. They support matching on source/destination IPv6 addresses, next header (protocol), and TCP/UDP ports.
- D
Standard IPv4 ACLs filter only the source IP address and are best placed close to the source to be most effective.
Why wrong: Standard ACLs filter only on source IP, but they should be placed as close to the destination as possible. Placing them near the source risks blocking legitimate traffic to other destinations unintentionally.
- E
Numbered ACLs allow individual access control entries (ACEs) to be deleted without removing the entire ACL.
Why wrong: By default, numbered ACLs require the entire list to be removed and re-entered to delete a single entry. Named ACLs support sequence-number-based editing, including removal of specific ACEs.
CCNA Network Services and Security Practice Question
This 200-301 practice question tests your understanding of network services and security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 about IPv4 and IPv6 ACLs are true?
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
Extended IPv4 ACLs should be placed as close to the source as possible to minimize unnecessary traffic on the network.
Option B is correct because extended IPv4 ACLs filter on source and destination IP addresses, ports, and protocols, so placing them as close to the source as possible prevents unwanted traffic from traversing the network, reducing bandwidth waste and security risks. This is a best practice for extended ACLs, unlike standard ACLs which should be placed close to the destination.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 IPv4 ACLs use numbers in the range 100-199.
Why it's wrong here
Standard numbered ACLs use 1–99 and 1300–1999; 100–199 and 2000–2699 are reserved for extended ACLs.
- ✓
Extended IPv4 ACLs should be placed as close to the source as possible to minimize unnecessary traffic on the network.
Why this is correct
Extended ACLs can match traffic with great specificity (source, destination, protocol, ports). Placing them near the source drops unwanted packets early, saving bandwidth and processing on downstream devices.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
IPv6 ACLs are always named and can filter traffic based on source and destination IPv6 addresses, as well as protocol types.
- ✗
Standard IPv4 ACLs filter only the source IP address and are best placed close to the source to be most effective.
Why it's wrong here
Standard ACLs filter only on source IP, but they should be placed as close to the destination as possible. Placing them near the source risks blocking legitimate traffic to other destinations unintentionally.
- ✗
Numbered ACLs allow individual access control entries (ACEs) to be deleted without removing the entire ACL.
Why it's wrong here
By default, numbered ACLs require the entire list to be removed and re-entered to delete a single entry. Named ACLs support sequence-number-based editing, including removal of specific ACEs.
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.
✓Extended IPv4 ACLs should be placed as close to the source as possible to minimize unnecessary traffic on the network.Correct answer▾
Why this is correct
Extended ACLs can match traffic with great specificity (source, destination, protocol, ports). Placing them near the source drops unwanted packets early, saving bandwidth and processing on downstream devices.
✗Standard IPv4 ACLs use numbers in the range 100-199.Wrong answer — click to see why▾
Why this is wrong here
The number range 100–199 is used for extended ACLs, not standard ones.
✗Standard IPv4 ACLs filter only the source IP address and are best placed close to the source to be most effective.Wrong answer — click to see why▾
Why this is wrong here
The placement advice is reversed: standard ACLs belong near the destination, not the source.
✗Numbered ACLs allow individual access control entries (ACEs) to be deleted without removing the entire ACL.Wrong answer — click to see why▾
Why this is wrong here
This is a common misconception; the ability to delete individual ACEs is a feature of named ACLs, not numbered.
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: answer the scenario, not the keyword
Cisco often tests the placement rule reversal—candidates confuse standard ACL placement (close to destination) with extended ACL placement (close to source), or mix up the number ranges for standard vs. extended ACLs.
Detailed technical explanation
How to think about this question
Extended ACLs use a sequence of permit/deny statements evaluated in order, and placing them close to the source leverages the 'first-match' logic to drop unwanted packets early in the path. In contrast, standard ACLs lack the granularity to differentiate between traffic types, so placing them near the destination ensures they only block traffic that would actually reach the target, avoiding unintended denial of service to other networks. Cisco IOS also supports 'object-group ACLs' for more complex filtering, but the core placement rule remains critical for performance and security.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
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.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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
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FAQ
Questions learners often ask
What does this 200-301 question test?
Network Services and Security — This question tests Network Services and Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Extended IPv4 ACLs should be placed as close to the source as possible to minimize unnecessary traffic on the network. — Option B is correct because extended IPv4 ACLs filter on source and destination IP addresses, ports, and protocols, so placing them as close to the source as possible prevents unwanted traffic from traversing the network, reducing bandwidth waste and security risks. This is a best practice for extended ACLs, unlike standard ACLs which should be placed close to the destination.
What should I do if I get this 200-301 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
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.
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