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CCNP Practice Question: Which three statements about extended ACLs on…
Which three statements about extended ACLs on Cisco IOS are true? (Choose three.)
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 ACLs can filter based on source and destination IP addresses.
Extended ACLs can filter based on source and destination IP addresses, protocol, and port numbers. They are processed sequentially until a match is found, and an implicit deny any is at the end. They can be applied to interfaces using the 'ip access-group' command. Extended ACLs cannot filter based on MAC addresses; that is done by MAC ACLs. They are not limited to source-only filtering.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Extended ACLs can filter based on source and destination IP addresses.
Why this is correct
Correct because extended ACLs evaluate both source and destination addresses.
- ✓
Extended ACLs can filter based on TCP or UDP port numbers.
Why this is correct
Correct because extended ACLs can specify protocol and port information for TCP/UDP.
- ✓
Extended ACLs are processed in order until a matching permit or deny statement is found.
Why this is correct
Correct because ACLs use first-match logic.
- ✗
Extended ACLs can filter based on source MAC addresses.
Why it's wrong here
Incorrect because MAC address filtering is done by MAC ACLs, not IP extended ACLs.
- ✗
Extended ACLs only filter traffic based on the source IP address.
Why it's wrong here
Incorrect because extended ACLs can filter on both source and destination, as well as protocol and port.
Visual reference
Quick reference
Access Control Model Comparison
| Model | Acronym | Who Controls Access? | Best For |
|---|---|---|---|
| Discretionary Access Control | DAC | Resource owner | Small teams, file shares |
| Mandatory Access Control | MAC | System / security labels | Classified govt / military |
| Role-Based Access Control | RBAC | Administrator (via roles) | Enterprise environments |
| Attribute-Based Access Control | ABAC | Policy engine (user + resource attributes) | Fine-grained, dynamic policies |
| Rule-Based Access Control | RuBAC | System rules / ACLs | Firewall rules, network ACLs |
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-401 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 350-401 exam.