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350-401 Practice Question: Which three statements about IPv4 ACLs on Cisco…
Which three statements about IPv4 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
✓
Standard ACLs can filter traffic based on source IP address only.
Standard ACLs filter only source IP, extended ACLs filter more fields, and the implicit deny is always present. The incorrect options confuse the order of processing or the placement of ACLs.
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 can filter traffic based on source IP address only.
Why this is correct
Correct because standard ACLs (numbered 1-99, 1300-1999) examine only the source IP address.
- ✓
Extended ACLs can filter based on source and destination IP addresses, protocol, and port numbers.
Why this is correct
Correct because extended ACLs (numbered 100-199, 2000-2699) support these additional match criteria.
- ✓
An implicit deny any statement is automatically added at the end of every ACL.
Why this is correct
Correct because all ACLs have an implicit deny any at the end, which drops any traffic not explicitly permitted.
- ✗
ACL entries are processed from bottom to top, with the last match determining the action.
Why it's wrong here
Incorrect because ACL entries are processed sequentially from top to bottom; the first match determines the action.
- ✗
An ACL applied to an inbound interface filters traffic leaving that interface.
Why it's wrong here
Incorrect because an inbound ACL filters traffic entering the interface; an outbound ACL filters traffic leaving the interface.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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