The correct answer is Standard ACL, because it filters traffic based solely on the source IP address, making it the simplest and most restrictive of the ACL types. Extended ACLs, by contrast, offer more granular filtering by evaluating source and destination IPs, protocols, and port numbers, while Named ACLs use names for identification rather than numbers, allowing easier editing and management. On the CCNA 200-301 v2 exam, this drag-and-drop task tests your ability to match each ACL type to its defining characteristic, with a common trap being confusion over where the implicit deny applies—remember it is the default deny-all rule at the end of every ACL. Inbound ACLs process traffic before routing, while outbound ACLs apply after routing, a distinction often tested in scenario-based questions. A helpful memory tip: Standard starts with S for Source only, Extended starts with E for Everything else.
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.
Drag and drop the ACL commands and concepts on the left to their correct descriptions on the right.
Standard ACLs filter traffic based solely on the source IP address, making them less granular than extended ACLs.
B
Extended ACL
Why wrong: Extended ACLs filter based on source and destination IP addresses, protocols, and port numbers, providing more granular control than standard ACLs.
C
Named ACL
Why wrong: Named ACLs use alphanumeric names instead of numbers for identification, but they still function as either standard or extended ACLs.
D
Implicit deny
Why wrong: Implicit deny is a default rule at the end of every ACL that denies all traffic not explicitly permitted, but it does not filter by source IP alone.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Standard ACL
Standard ACLs filter only by source IP. Extended ACLs offer more granular filtering. Named ACLs use names for identification. Implicit deny is the default deny-all at the end. Inbound ACLs process traffic before routing, outbound after routing.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 ACL
Why this is correct
Standard ACLs filter traffic based solely on the source IP address, making them less granular than extended ACLs.
Related concept
Standard ACLs match source addresses.
✗
Extended ACL
Why it's wrong here
Extended ACLs filter based on source and destination IP addresses, protocols, and port numbers, providing more granular control than standard ACLs.
✗
Named ACL
Why it's wrong here
Named ACLs use alphanumeric names instead of numbers for identification, but they still function as either standard or extended ACLs.
✗
Implicit deny
Why it's wrong here
Implicit deny is a default rule at the end of every ACL that denies all traffic not explicitly permitted, but it does not filter by source IP alone.
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 ACLCorrect answer▾
Why this is correct
Standard ACLs filter traffic based solely on the source IP address, making them less granular than extended ACLs.
✗Extended ACLWrong answer — click to see why▾
Why this is wrong here
The description 'filters only by source IP' applies to standard ACLs, not extended ACLs.
Why candidates choose this
Candidates may confuse the two types, thinking extended ACLs also filter only by source IP.
✗Named ACLWrong answer — click to see why▾
Why this is wrong here
The description 'filters only by source IP' is not specific to named ACLs; named ACLs can be standard or extended.
Why candidates choose this
Candidates might think named ACLs have different filtering criteria, but they do not.
✗Implicit denyWrong answer — click to see why▾
Why this is wrong here
Implicit deny is not an ACL type; it is a default behavior applied to all ACLs.
Why candidates choose this
Candidates might think implicit deny is a type of ACL that filters by source IP, but it is a rule.
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: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 200-301 question in full detail.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 200-301 ACL questions on filtering logic and placement.
Network Services and Security — This question tests Network Services and Security — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Standard ACL — Standard ACLs filter only by source IP. Extended ACLs offer more granular filtering. Named ACLs use names for identification. Implicit deny is the default deny-all at the end. Inbound ACLs process traffic before routing, outbound after routing.
What should I do if I get this 200-301 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 200-301 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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