300-410 Route Maps and Route Filtering Practice Question
This 300-410 practice question tests your understanding of route maps and route filtering. 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 of the following is true regarding the use of prefix-lists versus access-lists for route filtering?
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.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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
Incorrect. Prefix-lists are generally more efficient for route filtering.
✗
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.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.
TExam Day Tips
→Write the block size before choosing the subnet.
→Check whether the question asks for hosts, subnets or a specific address range.
→Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related 300-410 subnetting questions on CIDR, address ranges, and subnet selection.
Route Maps and Route Filtering — This question tests Route Maps and Route Filtering — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this 300-410 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related 300-410 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Question Discussion
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