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300-410 Practice Question: Is true regarding the use of prefix-lists versus…
Which of the following is true regarding the use of prefix-lists versus access-lists for route filtering?
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
✓
Prefix-lists can match on both network address and prefix length, while access-lists match only on network address.
Prefix-lists are designed specifically for route filtering and can match on prefix length using ge and le operators. Access-lists match on source/destination IP and wildcard mask but do not have the ability to specify prefix length ranges. Prefix-lists are more efficient and flexible for route 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.
- ✗
Access-lists can match on prefix length using the 'ge' and 'le' keywords.
Why it's wrong here
Incorrect. Only prefix-lists support ge and le for prefix length matching.
- ✓
Prefix-lists can match on both network address and prefix length, while access-lists match only on network address.
Why this is correct
Correct. Prefix-lists can specify both the prefix and a range of prefix lengths.
- ✗
Access-lists are more efficient than prefix-lists for route filtering.
Why it's wrong here
Access-lists process entries sequentially and perform a full match on each, whereas prefix-lists use a more optimised, binary search-like mechanism for matching prefixes. Therefore, access-lists are generally less efficient for route filtering. This option is tempting because access-lists are widely used for packet filtering, where their sequential matching is acceptable and often necessary for granular control over individual packets based on various criteria beyond just IP prefixes.
- ✗
Prefix-lists can only be used with BGP, while access-lists can be used with any protocol.
Why it's wrong here
Incorrect. Prefix-lists can be used with multiple routing protocols, including OSPF, EIGRP, and BGP.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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