This 200-301 practice question tests your understanding of ip routing. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: longest-prefix match means a router prefers the route with the most specific subnet mask that matches the destination IP address.. 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 two statements accurately describe longest-prefix match?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The most specific matching route is preferred over broader matching routes.
Longest-prefix match means the router prefers the most specific route that matches the destination. In plain language, if several routes could all work, the router chooses the one that describes the destination range most precisely. That is why a /25 wins over a /24, and a /24 wins over a /16, when all of them match the same destination.
This is a foundational routing rule. The wrong answers usually confuse route specificity with route-source trust or assume the default route is considered first. The two correct answers are the ones that keep the focus on specificity.
Key principle: Longest-prefix match means a router prefers the route with the most specific subnet mask that matches the destination IP address.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
The most specific matching route is preferred over broader matching routes.
Why this is correct
This is correct because specificity is the core rule in longest-prefix match.
Related concept
Longest-prefix match means a router prefers the route with the most specific subnet mask that matches the destination IP address.
✓
A /24 is more specific than a /16.
Why this is correct
This is correct because the longer prefix describes a narrower destination range.
Related concept
Longest-prefix match means a router prefers the route with the most specific subnet mask that matches the destination IP address.
✗
The default route is always preferred over a matching specific route.
Why it's wrong here
This is wrong because the default route is used only when no more specific route matches.
When this WOULD be correct
In a question that asks about routing behavior in a scenario where a network is configured to prioritize default routes for certain traffic types, such as in a failover situation, this option could be correct. For example, if a default route is explicitly configured to take precedence over specific routes for redundancy purposes.
✗
Administrative distance replaces the need for longest-prefix match.
Why it's wrong here
This is wrong because administrative distance and longest-prefix match serve different purposes.
When this WOULD be correct
In a question that asks about route selection criteria in a routing protocol where administrative distance is the sole factor for determining route preference, this option could be correct. For example, if the question specifies that the longest-prefix match is not applicable and only administrative distance is considered, then this statement would hold true.
✗
A /16 is more specific than a /24.
Why it's wrong here
This is wrong because the opposite is true.
When this WOULD be correct
If the exam question were to ask which subnet mask is less specific in a routing context, or if it specifically stated that the context was reversed or misinterpreted, then option E could be correct. For example, a question could state, 'Which of the following is true if we consider broader ranges?'
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.
✓The most specific matching route is preferred over broader matching routes.Correct answer▾
Why this is correct
This is correct because specificity is the core rule in longest-prefix match.
✗The default route is always preferred over a matching specific route.Wrong answer — click to see why▾
Why this is wrong here
The default route (0.0.0.0/0) has the shortest prefix length and is only used when no more specific route matches the destination. A specific route, such as a /24, will always be preferred over the default route for matching traffic.
★ When this WOULD be the correct answer
In a question that asks about routing behavior in a scenario where a network is configured to prioritize default routes for certain traffic types, such as in a failover situation, this option could be correct. For example, if a default route is explicitly configured to take precedence over specific routes for redundancy purposes.
Why candidates choose this
Students may think the default route is a catch-all and thus preferred, but they forget that longest-prefix match prioritizes specificity over generality.
✗Administrative distance replaces the need for longest-prefix match.Wrong answer — click to see why▾
Why this is wrong here
Administrative distance (AD) is used to select between routes from different routing protocols to the same destination, while longest-prefix match is used to select the most specific route among all routes, regardless of AD. They serve different purposes and both are used in route selection.
★ When this WOULD be the correct answer
In a question that asks about route selection criteria in a routing protocol where administrative distance is the sole factor for determining route preference, this option could be correct. For example, if the question specifies that the longest-prefix match is not applicable and only administrative distance is considered, then this statement would hold true.
Why candidates choose this
Students might confuse AD with prefix length because both influence route selection, but AD compares trustworthiness of routing sources, not specificity of prefixes.
✗A /16 is more specific than a /24.Wrong answer — click to see why▾
Why this is wrong here
A /16 prefix is less specific than a /24 because it has a shorter prefix length and covers a larger address range. Longest-prefix match prefers longer prefixes, so a /24 is more specific than a /16.
★ When this WOULD be the correct answer
If the exam question were to ask which subnet mask is less specific in a routing context, or if it specifically stated that the context was reversed or misinterpreted, then option E could be correct. For example, a question could state, 'Which of the following is true if we consider broader ranges?'
Why candidates choose this
Students may incorrectly associate larger subnet masks with less specificity, or they might reverse the relationship between prefix length and specificity.
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: answer the scenario, not the keyword
A frequent exam trap is assuming that the default route (0.0.0.0/0) is preferred over more specific routes. Many candidates mistakenly believe the default route is always the first choice, but in reality, it is the least specific and only used when no other matching route exists. Another trap is confusing administrative distance with longest-prefix match; administrative distance only applies when choosing between routes learned from different sources, not when selecting the most specific prefix. Misunderstanding these concepts can lead to incorrect answers about routing behavior in Cisco devices.
Detailed technical explanation
How to think about this question
Longest-prefix match is a fundamental routing principle used by Cisco routers to determine the best path for forwarding IP packets. When multiple routes in the routing table match a destination IP address, the router selects the route with the longest subnet mask, meaning the most specific prefix. This ensures that traffic is forwarded along the most precise path available, optimizing routing efficiency and accuracy.
The decision process for longest-prefix match involves comparing the prefix lengths of all matching routes. For example, a /24 prefix (255.255.255.0) covers fewer IP addresses than a /16 prefix (255.255.0.0), making the /24 route more specific. The router always prefers the route with the longest prefix length, regardless of other factors like administrative distance or metric, unless no matching route exists. The default route (0.0.0.0/0) is the least specific and is only used when no other route matches.
A common exam trap is confusing longest-prefix match with administrative distance or assuming the default route is preferred over specific routes. Administrative distance is used to choose between routes learned from different routing protocols but does not override prefix specificity. In practical networking, understanding longest-prefix match prevents misrouting and ensures that traffic follows the intended path, especially in complex networks with overlapping subnets or multiple routing sources.
KKey Concepts to Remember
Longest-prefix match means a router prefers the route with the most specific subnet mask that matches the destination IP address.
A route with a longer prefix length (e.g., /24) describes a narrower range of IP addresses than a shorter prefix length (e.g., /16).
The default route (0.0.0.0/0) is the least specific and is only used when no more specific route exists in the routing table.
Administrative distance is used to select between routes from different routing protocols but does not replace longest-prefix match.
Routers perform longest-prefix match before considering administrative distance or metric values when forwarding packets.
A more specific route installed in the routing table overrides broader routes for the same destination network.
Longest-prefix match ensures efficient and accurate routing by directing traffic to the most precise next-hop available.
Confusing route specificity with route trustworthiness or default route preference is a common mistake in routing decisions.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Longest-prefix match means a router prefers the route with the most specific subnet mask that matches the destination IP address.
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 200-301 question in full detail.
Review longest-prefix match means a router prefers the route with the most specific subnet mask that matches the destination IP address., then practise related 200-301 questions on the same topic to reinforce the concept.
IP Routing — This question tests IP Routing — Longest-prefix match means a router prefers the route with the most specific subnet mask that matches the destination IP address..
What is the correct answer to this question?
The correct answer is: The most specific matching route is preferred over broader matching routes. — Longest-prefix match means the router prefers the most specific route that matches the destination. In plain language, if several routes could all work, the router chooses the one that describes the destination range most precisely. That is why a /25 wins over a /24, and a /24 wins over a /16, when all of them match the same destination.
This is a foundational routing rule. The wrong answers usually confuse route specificity with route-source trust or assume the default route is considered first. The two correct answers are the ones that keep the focus on specificity.
What should I do if I get this 200-301 question wrong?
Review longest-prefix match means a router prefers the route with the most specific subnet mask that matches the destination IP address., then practise related 200-301 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Longest-prefix match means a router prefers the route with the most specific subnet mask that matches the destination IP address.
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